CN114456049A - Preparation method and device of benzaldehyde - Google Patents
Preparation method and device of benzaldehyde Download PDFInfo
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- CN114456049A CN114456049A CN202210078524.7A CN202210078524A CN114456049A CN 114456049 A CN114456049 A CN 114456049A CN 202210078524 A CN202210078524 A CN 202210078524A CN 114456049 A CN114456049 A CN 114456049A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/42—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by hydrolysis
- C07C45/43—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by hydrolysis of >CX2 groups, X being halogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/009—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping in combination with chemical reactions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
- C07C45/81—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
- C07C45/82—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
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Abstract
The invention discloses a preparation method and a device of benzaldehyde, which comprises a stirrer, wherein the bottom end of the stirrer is provided with a supporting leg and a discharge hole, the top end of the feeding box is provided with a pre-stirring box, the device for preparing benzaldehyde is provided with a discharging mechanism, so that when the pre-stirring box stirs the mixture of the dichlorobenzyl and the water, the discharging mechanism is driven by the motor to operate, then the mixture is discharged into the feeding box, at the moment, the rotating shaft drives the brush to rotate, so that the mixture of the dichlorobenzyl and the water falling into the feeding box uniformly falls into the stirrer through the through holes, thereby being beneficial to uniform stirring and improving the stirring efficiency, and meanwhile, the first scraping mechanism is arranged in the stirrer, be provided with the second at the discharge gate department and strike off the mechanism to strike off the inner wall of mixer and discharge gate, and then avoid the raw materials to drop in the mixer and lead to the unusual condition of ratio to take place.
Description
Technical Field
The invention relates to the technical field of preparation of benzaldehyde, in particular to a preparation method and a preparation device of benzaldehyde.
Background
Benzaldehyde is the simplest and most industrially important aromatic aldehyde. It is present in bitter almonds and is therefore called bitter almond oil, so that benzaldehyde has the taste of bitter almonds. Benzaldehyde is widely used, and is mainly used for manufacturing dyes, medicines, perfumes and other intermediates:
1) and a dye: it is used for producing triphenylmethane, leucomalachite green, and for producing dyes such as acridone.
2) And medicine: for the manufacture of phenyl glycine, benzoin, ephedrine and penicillin.
3) And spice: it can be used for preparing cinnamic acid and its ester, cinnamyl alcohol, cinnamaldehyde mandelic acid, etc. And the benzaldehyde can be used as a seasoning and a spice for blending soap essence, edible essence and the like.
4) And the other: benzaldehyde can be used for preparing pesticide, photographic agent, anticorrosive agent, etc., and can also be used as electroplating bath additive for preparing insulating and fireproof materials, coatings, etc.
At present, during the production and manufacture of benzaldehyde, raw material dichlorobenzyl needs to be hydrolyzed, in the prior art, dichlorobenzyl and water are usually directly added into a stirrer, and then dichlorobenzyl and water are respectively concentrated at a certain position in the stirrer, so that the stirring efficiency is low, and meanwhile, the stirring is possibly nonuniform, and the quality of prepared benzaldehyde is influenced.
Disclosure of Invention
The invention aims to provide a method and a device for preparing benzaldehyde, which are beneficial to improving mixing efficiency, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the preparation method of benzaldehyde comprises the following steps:
s1, reacting in a preparation device to enable dichlorobenzyl and water to generate benzaldehyde and hydrogen chloride under the catalytic action of zinc chloride;
s2, adding water into the material obtained after hydrolysis of the dichlorobenzyl, firstly separating acid and zinc chloride residues, and then washing with water;
s3, feeding the washed crude aldehyde into a benzaldehyde rectifying kettle and a rectifying tower for vacuum rectification;
s4, collecting front fraction and back fraction from the tower top to a crude aldehyde receiving tank, and transferring the qualified benzaldehyde product to a refined aldehyde receiving tank.
Preferably, hydrochloric acid generated by hydrogen chloride through water absorption is sent to a finished product tank area as a product, the processes of benzyl dichloride hydrolysis and hydrogen chloride absorption are micro-negative pressure operation, a fan is used for pumping the micro-negative pressure, and tail gas at the outlet of the fan is subjected to alkali liquor absorption and activated carbon filtration and then is discharged in a qualified mode.
A device for preparing benzaldehyde is used for a hydrolysis process of dichlorobenzyl and comprises a stirrer, a discharging mechanism, a first scraping mechanism and a second scraping mechanism, wherein a supporting leg and a discharge port are arranged at the bottom end of the stirrer, a feeding box is arranged at the top end of the stirrer, a pre-stirring box is arranged at the top end of the feeding box, a motor is fixedly connected to the top end of the pre-stirring box, a rotating shaft penetrating through the pre-stirring box, the feeding box and the stirrer is fixedly connected to the output end of the motor, a plurality of groups of stirring blades are fixedly connected to the rotating shaft and are respectively positioned in the pre-stirring box and the stirrer, a plurality of groups of through holes are formed in the bottom end of the feeding box, the discharging mechanism used for discharging materials in the pre-stirring box is arranged in the pre-stirring box and is positioned at a position close to the bottom end of the pre-stirring box, and the first scraping mechanism used for scraping materials adhered to the inner wall of the stirrer is arranged in the stirrer, the second scraping mechanism for scraping the raw materials on the inner wall of the discharge hole is arranged at the discharge hole.
Preferably, arrange material mechanism and include the first pinion with pivot fixed connection, the outside meshing of first pinion has two sets of relative racks in position, and is two sets of equal fixedly connected with connecting block on the rack, and the equal fixedly connected with locating part in both ends, and is two sets of equal fixedly connected with on the connecting block and stirring case sliding connection's closing plate in advance, it is two sets of all set up the spread groove with connecting block looks adaptation on the closing plate, and with the bottom looks adaptation of stirring case in advance, and be located the bottom position of stirring case in advance, set up the sliding tray with closing plate and rack looks adaptation on stirring case in advance and the feed box, go back fixedly connected with turning block in the pivot, the outside fixedly connected with of turning block and the brush of stirring case bottom contact in advance.
Preferably, the locating part is including setting up the movable tooth at rack both ends, the first fixing base of fixedly connected with on the movable tooth, swing joint has the spliced pole on the first fixing base, fixedly connected with and rack fixed connection's second fixing base on the spliced pole, be provided with the first spring that the cover was established in the spliced pole outside between first fixing base and the second fixing base.
Preferably, the first scraping mechanism comprises a driving wheel fixed on the rotating shaft, the outer side of the driving wheel is in transmission connection with a belt, the other end of the belt is in transmission connection with a driven wheel, the driven wheel is fixedly connected with a connecting shaft which is rotationally connected with the bottom end of the feeding box, the bottom end of the connecting shaft is fixedly connected with a reciprocating screw rod, a first limit groove is arranged on the reciprocating screw rod, and the thread is connected with a thread block which is connected with the inner wall of the stirrer in a sliding way, a second flat gear which is connected with the thread block in a rotating way is connected on the thread block in a sliding way in the first limit groove, a scraping plate rotationally connected with the thread block is arranged on the outer side of the second flat gear, the outer wall of the scraping plate is attached to the inner wall of the stirrer, the inner side of the scraper is fixedly connected with a gear ring meshed with the second flat gear, and a reset piece is arranged on the connecting shaft and positioned at the top end of the thread block.
Preferably, the piece that resets includes the stationary blade with connecting axle fixed connection, fixedly connected with cover establishes the second spring in the connecting axle outside on the stationary blade, the top fixedly connected with of second spring and connecting axle sliding connection's movable plate.
Preferably, the second strikes off the mechanism include with pivot bottom fixed connection's connecting rod, the second spacing groove has been seted up on the connecting rod, sliding connection has the connecting ring in the second spacing groove, the outside fixedly connected with overcoat pole of connecting ring, the inside of overcoat pole is provided with the third spring, the top fixedly connected with of third spring and overcoat pole sliding connection's interior slide bar, the strip of scraping that the one end fixedly connected with of interior slide bar and the laminating of discharge gate inner wall set up, set up two sets of screw thread opposite direction's thread groove on the inner wall of discharge gate.
Preferably, the number of the brushes is provided with a plurality of groups, the groups are circumferentially distributed on the outer side of the rotating block, and the tips of the brushes penetrate through the through holes.
Preferably, the bottom end of the scraper is provided with sawteeth, and the inclined direction of the sawteeth is opposite to the rotating direction of the scraper when scraping.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the discharging mechanism is arranged, so that after the pre-stirring box stirs the dichlorobenzyl and the water, the discharging mechanism is driven by the motor to operate and then discharged into the feeding box, at the moment, the rotating shaft drives the hairbrush to rotate, and thus, a mixture of the dichlorobenzyl and the water falling into the feeding box uniformly falls into the stirrer through the through holes, so that uniform stirring is facilitated, and the stirring efficiency is improved.
2. Simultaneously be provided with first striking off the mechanism in the mixer, be provided with the second at discharge gate department and strike off the mechanism to strike off the inner wall of mixer and discharge gate, and then avoid the raw materials to fall down and lead to the unusual condition of ratio to take place in the mixer.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the internal structure of the blender of the present invention;
FIG. 3 is a schematic view of the construction of a pre-agitation tank and a feed tank according to the present invention;
FIG. 4 is a schematic view of a partial structure of the discharge mechanism of the present invention;
FIG. 5 is a schematic view of the structure of area A in FIG. 4 according to the present invention;
FIG. 6 is a schematic view of the structure of region B in FIG. 2 according to the present invention;
FIG. 7 is a schematic view of the structure of the region C in FIG. 2 according to the present invention.
In the figure: 1-a stirrer; 2-supporting legs; 3-discharging port; 4-a feeding box; 5-a pre-stirring box; 6-top cover; 7-an electric motor; 8-a rotating shaft; 9-stirring blade; 10-a through hole; 11-a discharge mechanism; 12-a first scraping mechanism; 13-a second scraping mechanism; 14-a first spur gear; 15-a rack; 16-connecting blocks; 17-a sealing plate; 18-a connecting trough; 19-a stop; 20-movable teeth; 21-a first fixed seat; 22-connecting column; 23-a first spring; 24-a second fixed seat; 25-a turning block; 26-a brush; 27-a driving wheel; 28-a belt; 29-a driven wheel; 30-a connecting shaft; 31-reciprocating screw rod; 32-a first limit groove; 33-a second spur gear; 34-a thread block; 35-a scraper; 36-a gear ring; 37-a reset member; 38-a fixing sheet; 39-a second spring; 40-movable sheet; 41-a connecting rod; 42-a second limit groove; 43-connecting ring; 44-an outer loop bar; 45-a third spring; 46-an inner slide bar; 47-scraping strip; 48-thread groove; 49-sliding groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention discloses a technical scheme, and a preparation method of benzaldehyde, which comprises the following steps:
s1, reacting in a preparation device to enable dichlorobenzyl and water to generate benzaldehyde and hydrogen chloride under the catalytic action of zinc chloride;
s2, adding water into the material obtained after hydrolysis of the dichlorobenzyl, firstly separating acid and zinc chloride residues, and then washing with water;
s3, feeding the washed crude aldehyde into a benzaldehyde rectifying kettle and a rectifying tower for vacuum rectification;
s4, collecting front fraction and back fraction from the tower top to a crude aldehyde receiving tank, and transferring the qualified benzaldehyde product to a refined aldehyde receiving tank.
Hydrochloric acid generated by hydrogen chloride through water absorption is sent to a finished product tank area as a product, the processes of benzyl dichloride hydrolysis and hydrogen chloride absorption are micro-negative pressure operation, a fan is used for pumping the micro-negative pressure, and tail gas at the outlet of the fan is qualified to be discharged after alkali liquor absorption and active carbon filtration.
Chemical reaction equation:
C6H5CHCl2+H2O—C6H5CHO+2HCl↑
side reaction:
C6H5CCl3+2H2O—C6H5COOH+3HCl↑
C6H5CH2Cl+H2O—C6H5CH2OH+HCl↑
example 2
Referring to fig. 1-7 for describing embodiment 1, the apparatus for preparing benzaldehyde in the figure comprises a stirrer 1, a discharging mechanism, a first scraping mechanism 12 and a second scraping mechanism 13, wherein a supporting leg 2 and a discharging port 3 are arranged at the bottom end of the stirrer 1, a feeding box 4 is arranged at the top end of the stirrer 1, a pre-stirring box 5 is arranged at the top end of the feeding box 4, a motor 7 is fixedly connected to the top end of the pre-stirring box 5, a rotating shaft 8 penetrating through the pre-stirring box 5, the feeding box 4 and the stirrer 1 is fixedly connected to the output end of the motor 7, a plurality of groups of stirring blades 9 are fixedly connected to the rotating shaft 8, the stirring blades 9 are respectively arranged in the pre-stirring box 5 and the stirrer 1, a plurality of groups of through holes 10 are arranged at the bottom end of the feeding box 4 for discharging a mixture of benzyl dichloride and water in the pre-stirring box 5, and are arranged at a position of the pre-stirring box 5 close to the bottom end, the first scraping mechanism 12 for scraping the raw materials adhered to the inner wall of the stirrer 1 is arranged in the stirrer 1, and the second scraping mechanism 13 for scraping the raw materials on the inner wall of the discharge port 3 is arranged at the discharge port 3;
the discharging mechanism comprises a first pinion 14 fixedly connected with a rotating shaft 8, two groups of racks 15 opposite in position are meshed on the outer side of the first pinion 14, two groups of racks 15 are fixedly connected with connecting blocks 16, two ends of each rack 15 are fixedly connected with limiting pieces 19, two groups of connecting blocks 16 are fixedly connected with sealing plates 17 in sliding connection with a pre-stirring box 5, two groups of sealing plates 17 are provided with connecting grooves 18 matched with the connecting blocks 16 and matched with the bottom end of the pre-stirring box 5 and located at the bottom end of the pre-stirring box 5, sliding grooves 49 matched with the sealing plates 17 and the racks 15 are formed in the pre-stirring box 5 and a feeding box 4, the rotating shaft 8 is also fixedly connected with a rotating block 25, and a brush 26 in contact with the bottom end of the pre-stirring box 5 is fixedly connected on the outer side of the rotating block 25;
wherein, the first scraping mechanism 12 comprises a driving wheel 27 fixed on the rotating shaft 8, the outer side of the driving wheel 27 is in transmission connection with a belt 28, the other end of the belt 28 is in transmission connection with a driven wheel 29, the driven wheel 29 is fixedly connected with a connecting shaft 30 rotationally connected with the bottom end of the feeding box 4, the bottom end of the connecting shaft 30 is fixedly connected with a reciprocating screw rod 31, the reciprocating screw rod 31 is provided with a first limit groove 32 and is in threaded connection with a thread block 34 slidably connected with the inner wall of the stirring machine 1, the first limit groove 32 on the thread block 34 is slidably connected with a second flat gear 33 rotationally connected with the thread block 34, the outer side of the second flat gear 33 is provided with a scraping plate 35 rotationally connected with the thread block 34, the outer wall of the scraping plate 35 is attached to the inner wall of the stirring machine 1, the inner side of the scraping plate 35 is fixedly connected with a gear ring 36 engaged with the second flat gear 33, a reset piece 37 is arranged at the top end of the thread block 34 on the connecting shaft 30;
the second scraping mechanism 13 includes a connecting rod 41 fixedly connected to the bottom end of the rotating shaft 8, a second limiting groove 42 is formed in the connecting rod 41, a connecting ring 43 is slidably connected to the second limiting groove 42, an outer sleeve 44 is fixedly connected to the outer side of the connecting ring 43, a third spring 45 is arranged inside the outer sleeve 44, an inner slide rod 46 slidably connected to the outer sleeve 44 is fixedly connected to the top end of the third spring 45, a scraping strip 47 attached to the inner wall of the discharge port 3 is fixedly connected to one end of the inner slide rod 46, and two sets of thread grooves 48 with opposite thread directions are formed in the inner wall of the discharge port 3;
when the device is carried out: catalyst zinc chloride is placed in a stirrer 1 in advance, and then dichlorobenzyl and water are conveyed into a pre-stirring box 5 through a feeding pipe on the pre-stirring box 5, a rotating shaft 8 is driven to rotate by starting a motor 7, so that stirring blades 9 in the pre-stirring box 5 and the stirrer 1 are driven to rotate, and the stirring effect of dichlorobenzyl and water in the pre-stirring box 5 is achieved, when the motor 7 rotates, due to the existence of a limiting piece 19 and a resetting piece 37, two groups of sealing plates 17 cannot move at the moment, a thread block 34 cannot be driven to move by a reciprocating screw rod 31, when the pre-stirring is completed, the rotating shaft 8 rotates reversely through the motor 7, at the moment, a first pinion 14 and a driving wheel 27 are driven to rotate, the first pinion 14 drives two groups of racks 15 oppositely arranged, so that the sealing plates 17 are opened, when the sealing plates 17 are opened, due to the existence of the limiting piece 19, the sealing plate 17 cannot be moved continuously, the stirred dichlorobenzyl and water mixture enters the feeding box 4, meanwhile, the rotating shaft 8 drives the hairbrush 26 to rotate, so that the dichlorobenzyl and water mixture falling in the feeding box 4 is brushed into the stirring machine 1 through the through hole 10 by the hairbrush 26, at this time, the driving wheel 27 rotates to drive the driven wheel 29 to rotate through the belt 28, so as to drive the reciprocating screw rod 31 to rotate, so that the screw block 34 is in threaded connection with the reciprocating screw rod 31 through the action of the resetting piece 37, so as to drive the screw block 34 to move, and further drive the scraper 35 to move, the second flat gear 33 is driven to rotate while the reciprocating screw rod 31 rotates to drive the gear ring 36 to rotate, and further drive the scraper 35 to rotate, so that the raw material and the dichlorobenzyl and water mixture adsorbed on the inner wall of the stirring machine 1 are effectively scraped, make raw materials and dichloro benzyl and water mixture intensive mixing, meanwhile, stirring leaf 9 stirs the raw materials that fall into in the mixer 1, improve the homogeneity of stirring efficiency and stirring effectively, when dichloro benzyl and water mixture completely get into the mixer 1 in, with 7 corotation of motor this moment, and then seal closing plate 17, scraper blade 35 loses the effect, drive pivot 8 and stirring leaf 9 through motor 7 and rotate the mixture of stirring in 1 at a high speed through this moment, make its misce bene, after the hydrolysis, export catalytic reaction's product benzaldehyde through discharge gate 3.
In the discharging process, because of the adhesiveness of benzaldehyde, some benzaldehyde is adhered to the inner wall of the stirring machine 1 and is difficult to be removed, after discharging, the benzaldehyde adsorbed on the inner elements of the stirring machine 1 such as the stirring blades 9, the rotating shaft 8 and the like is completely thrown to the inner wall of the stirring machine 1 through centrifugal force by reversing the motor 7, the scraping plate 35 is rotated and moved due to the reversing of the motor 7, and all raw materials on the inner wall are scraped to the discharging port 3, at the moment, the connecting rod 41 is driven to rotate due to the rotation of the rotating shaft 8, the connecting ring 43 is driven to rotate, the outer sleeve 44 is driven to rotate, the inner slide rod 46 is driven to rotate, and the scraping strip 47 is driven to rotate, because two groups of thread grooves 48 with opposite thread directions are formed on the inner wall of the feeding port, and the feeding port is set to be conical, and then through the effect of third spring 45, make interior slide bar 46 compression, thereby make and scrape strip 47 in feed inlet department rotary motion, and then scrape the benzaldehyde of discharge gate 3 department, because the volume of scraping strip 47 is less, thereby absorbent raw materials is less, in this scheme, the preferred Y80M1-2 model of motor 7, power supply system is connected through the switch to motor 7's power supply interface, motor 7 operation circuit is conventional motor positive and negative control program, the current conventional circuit of circuit operation, circuit and control that relate to in this scheme are prior art, do not carry out too much the repeated description here.
Example 3
Referring now to fig. 3-5 for a description of example 2, this embodiment further describes example 1, in the figure, the discharging mechanism comprises a first flat gear 14 fixedly connected with a rotating shaft 8, two groups of racks 15 in opposite positions are meshed outside the first flat gear 14, connecting blocks 16 are fixedly connected on the two groups of racks 15, and both ends are fixedly connected with a limiting piece 19, two groups of connecting blocks 16 are fixedly connected with sealing plates 17 which are in sliding connection with the pre-stirring box 5, two groups of sealing plates 17 are provided with connecting grooves 18 which are matched with the connecting blocks 16, and is matched with the bottom end of the pre-stirring box 5 and is positioned at the bottom end of the pre-stirring box 5, a sliding groove 49 matched with the sealing plate 17 and the rack 15 is arranged on the pre-stirring box 5 and the feeding box 4, the rotating shaft 8 is also fixedly connected with a rotating block 25, and the outer side of the rotating block 25 is fixedly connected with a brush 26 which is in contact with the bottom end of the pre-stirring box 5;
the limiting part 19 comprises movable teeth 20 arranged at two ends of the rack 15, a first fixed seat 21 is fixedly connected to the movable teeth 20, a connecting column 22 is movably connected to the first fixed seat 21, a second fixed seat 24 fixedly connected to the rack 15 is fixedly connected to the connecting column 22, and a first spring 23 sleeved on the outer side of the connecting column 22 is arranged between the first fixed seat 21 and the second fixed seat 24;
when limiting is carried out; when the first flat gear 14 rotates forward, the first flat gear 14 engages with the movable teeth 20, and the movable teeth 20 are driven to move, and the movable tooth 20 will move the first fixed seat 21, thereby compressing the first spring 23, and thus will make the movable tooth 20 lose the engagement with the gear, so that the first pinion 14 does not move the rack 15 when it rotates, and when the first pinion 14 rotates in the reverse direction, the first spur gear 14 is now engaged with the moving teeth 20, which will move the moving teeth 20, and the movable teeth 20 will pull the rack 15 and move, so that the first pinion 14 is engaged with the rack 15, and thus the sealing plate 17 is moved so that the sealing plate 17 is opened, and when moved to the end of the rack 15, the first pinion 14 is engaged with the movable teeth 20 at the end of the rack 15 so that the rack 15 is not moved, thereby limiting the sealing plate 17.
Example 4
Referring to fig. 2 and fig. 6 for describing example 3, in this embodiment, the example 1 is further described, in the figure, the first scraping mechanism 12 includes a driving wheel 27 fixed on the rotating shaft 8, a belt 28 is connected to an outer side of the driving wheel 27 in a transmission manner, a driven wheel 29 is connected to another end of the belt 28 in a transmission manner, a connecting shaft 30 connected to a bottom end of the feeding box 4 in a rotation manner is fixedly connected to the driven wheel 29, a reciprocating screw rod 31 is fixedly connected to a bottom end of the connecting shaft 30, a first limiting groove 32 is formed in the reciprocating screw rod 31, a screw block 34 connected to an inner wall of the mixer 1 in a sliding manner is connected to the screw rod in a threaded manner, a second flat gear 33 connected to the screw block 34 in a sliding manner is connected to the first limiting groove 32 in the screw block 34 in a sliding manner, a scraping plate 35 connected to the screw block 34 in a rotation manner is disposed on an outer side of the second flat gear 33, an outer wall of the scraping plate 35 is attached to the inner wall of the mixer 1, a gear ring 36 meshed with the second flat gear 33 is fixedly connected to the inner side of the scraper 35, and a reset piece 37 is arranged at the top end of the thread block 34 on the connecting shaft 30; the reset piece 37 comprises a fixed piece 38 fixedly connected with the connecting shaft 30, a second spring 39 sleeved outside the connecting shaft 30 is fixedly connected to the fixed piece 38, and a movable piece 40 connected with the connecting shaft 30 in a sliding manner is fixedly connected to the top end of the second spring 39;
when the reciprocating screw rod 31 rotates forwards, the thread block 34 and the reciprocating screw rod 31 cannot be in threaded connection, the thread block 34 is pushed against, the thread block 34 is located on the connecting shaft 30, when the reciprocating screw rod 31 rotates backwards, the thread block 34 is rebounded to the position in threaded connection with the reciprocating screw rod 31 due to the elastic action of the second spring 39, and therefore the reciprocating screw rod 31 drives the thread block 34 to move forwards and backwards, and therefore the scraper 35 is driven to move forwards and backwards.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The preparation method of benzaldehyde is characterized by comprising the following steps: the method comprises the following steps:
s1, reacting in a preparation device to enable dichlorobenzyl and water to generate benzaldehyde and hydrogen chloride under the catalytic action of zinc chloride;
s2, adding water into the material obtained after hydrolysis of the dichlorobenzyl, firstly separating acid and zinc chloride residues, and then washing with water;
s3, feeding the washed crude aldehyde into a benzaldehyde rectifying kettle and a rectifying tower for vacuum rectification;
s4, collecting front fraction and back fraction from the tower top to a crude aldehyde receiving tank, and transferring the qualified benzaldehyde product to a refined aldehyde receiving tank.
2. The process for producing benzaldehyde according to claim 1, wherein: hydrochloric acid generated by hydrogen chloride through water absorption is sent to a finished product tank area as a product, the processes of benzyl dichloride hydrolysis and hydrogen chloride absorption are micro-negative pressure operation, a fan is used for pumping the micro-negative pressure, and tail gas at the outlet of the fan is qualified to be discharged after alkali liquor absorption and active carbon filtration.
3. Benzaldehyde preparation facility for the hydrolysis process of dichloro benzyl, its characterized in that: the method comprises the following steps:
the device comprises a stirrer (1), wherein supporting legs (2) and a discharge hole (3) are arranged at the bottom end of the stirrer (1), a feeding box (4) is arranged at the top end of the stirring box (1), a pre-stirring box (5) is arranged at the top end of the feeding box (4), a motor (7) is fixedly connected to the top end of the pre-stirring box (5), a rotating shaft (8) penetrating through the pre-stirring box (5), the feeding box (4) and the stirrer (1) is fixedly connected to the output end of the motor (7), a plurality of groups of stirring blades (9) are fixedly connected to the rotating shaft (8), the stirring blades (9) are respectively positioned in the pre-stirring box (5) and the stirrer (1), and a plurality of groups of through holes (10) are formed in the bottom end of the feeding box (4);
the discharging mechanism is used for discharging the materials in the pre-stirring box (5), is arranged in the pre-stirring box (5), and is positioned at the position, close to the bottom end, of the pre-stirring box (5);
the first scraping mechanism (12) is used for scraping the raw materials adhered to the inner wall of the stirrer (1), and the first scraping mechanism (12) is arranged in the stirrer (1);
and the second scraping mechanism (13) is used for scraping the raw materials on the inner wall of the discharge hole (3), and the second scraping mechanism (13) is arranged at the discharge hole (3).
4. The apparatus for producing benzaldehyde according to claim 3, wherein: the discharging mechanism comprises a first flat gear (14) fixedly connected with a rotating shaft (8), two groups of racks (15) with opposite positions are meshed on the outer side of the first flat gear (14), two groups of connecting blocks (16) are fixedly connected to the racks (15) and limiting parts (19) are fixedly connected to the two ends of the racks, two groups of sealing plates (17) connected with a pre-stirring box (5) in a sliding manner are fixedly connected to the connecting blocks (16), connecting grooves (18) matched with the connecting blocks (16) are formed in the two groups of sealing plates (17) and are matched with the bottom end of the pre-stirring box (5) and are located at the bottom end of the pre-stirring box (5), sliding grooves (49) matched with the sealing plates (17) and the racks (15) are formed in the pre-stirring box (5) and a feeding box (4), a rotating block (25) is fixedly connected to the rotating shaft (8), the outer side of the rotating block (25) is fixedly connected with a brush (26) which is in contact with the bottom end of the pre-stirring box (5).
5. The apparatus for producing benzaldehyde according to claim 4, wherein: locating part (19) is including setting up movable tooth (20) at rack (15) both ends, the first fixing base (21) of fixedly connected with is gone up in movable tooth (20), swing joint has spliced pole (22) on first fixing base (21), fixedly connected with and rack (15) fixed connection's second fixing base (24) are gone up in spliced pole (22), be provided with between first fixing base (21) and second fixing base (24) and establish first spring (23) in spliced pole (22) outside at the cover.
6. The apparatus for producing benzaldehyde according to claim 5, wherein: the first scraping mechanism (12) comprises a driving wheel (27) fixed on the rotating shaft (8), a belt (28) is connected to the outer side of the driving wheel (27) in a transmission manner, a driven wheel (29) is connected to the other end of the belt (28) in a transmission manner, a connecting shaft (30) rotatably connected with the bottom end of the feeding box (4) is fixedly connected to the driven wheel (29), a reciprocating lead screw (31) is fixedly connected to the bottom end of the connecting shaft (30), a first limiting groove (32) is formed in the reciprocating lead screw (31), a thread block (34) slidably connected with the inner wall of the stirring machine (1) is connected to the reciprocating lead screw in a threaded manner, a second flat gear (33) rotatably connected with the thread block (34) is slidably connected to the first limiting groove (32) on the thread block (34), and a scraping plate (35) rotatably connected with the thread block (34) is arranged on the outer side of the second flat gear (33), the outer wall of the scraper (35) is attached to the inner wall of the stirrer (1), a gear ring (36) meshed with the second flat gear (33) is fixedly connected to the inner side of the scraper (35), and a reset piece (37) is arranged on the connecting shaft (30) and located at the top end of the thread block (34).
7. The apparatus for producing benzaldehyde according to claim 6, wherein: reset piece (37) including with connecting axle (30) fixed connection's stationary blade (38), fixedly connected with cover is established at second spring (39) in connecting axle (30) outside on stationary blade (38), the top fixedly connected with of second spring (39) and connecting axle (30) sliding connection's movable plate (40).
8. The apparatus for producing benzaldehyde according to claim 7, wherein: mechanism (13) is scraped to second include with pivot (8) bottom fixed connection's connecting rod (41), second spacing groove (42) have been seted up on connecting rod (41), sliding connection has connecting ring (43) in second spacing groove (42), outside fixedly connected with overcoat pole (44) of connecting ring (43), the inside of overcoat pole (44) is provided with third spring (45), the top fixedly connected with of third spring (45) and overcoat pole (44) sliding connection's interior slide bar (46), the one end fixedly connected with of interior slide bar (46) and strip (47) of scraping that discharge gate (3) inner wall laminating set up, set up two sets of screw thread groove (48) that the screw thread direction is opposite on the inner wall of discharge gate (3).
9. The apparatus for producing benzaldehyde according to claim 8, wherein: the number of the hairbrushes (26) is provided with a plurality of groups, the groups are circumferentially distributed on the outer side of the rotating block (25), and the hairtips of the hairbrushes (26) penetrate through the through holes (10).
10. The apparatus for producing benzaldehyde according to claim 9, wherein: the bottom of scraper blade (35) is provided with the sawtooth, and the rotation direction when the slope direction of sawtooth is scraped with scraper blade (35) is opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210078524.7A CN114456049B (en) | 2022-01-24 | 2022-01-24 | Preparation device of benzaldehyde |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210078524.7A CN114456049B (en) | 2022-01-24 | 2022-01-24 | Preparation device of benzaldehyde |
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| CN114456049B CN114456049B (en) | 2023-02-17 |
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| CN202210078524.7A Active CN114456049B (en) | 2022-01-24 | 2022-01-24 | Preparation device of benzaldehyde |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB816253A (en) * | 1957-01-15 | 1959-07-08 | Chemon Corp | Improvements relating to the production of benzaldehyde from toluene |
| JPS60218349A (en) * | 1984-04-16 | 1985-11-01 | Hodogaya Chem Co Ltd | Preparation of benzaldehyde |
| CN109796318A (en) * | 2019-01-22 | 2019-05-24 | 江苏佳麦化工有限公司 | A kind of synthesis technology of benzaldehyde |
| CN211988661U (en) * | 2020-03-16 | 2020-11-24 | 安徽沙丰新材料有限公司 | Mixing equipment for preparing water-based zinc stearate |
| CN215511665U (en) * | 2021-07-28 | 2022-01-14 | 江西万年县万年青商砼有限公司 | High-efficient agitating unit is used in concrete production and processing |
-
2022
- 2022-01-24 CN CN202210078524.7A patent/CN114456049B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB816253A (en) * | 1957-01-15 | 1959-07-08 | Chemon Corp | Improvements relating to the production of benzaldehyde from toluene |
| JPS60218349A (en) * | 1984-04-16 | 1985-11-01 | Hodogaya Chem Co Ltd | Preparation of benzaldehyde |
| CN109796318A (en) * | 2019-01-22 | 2019-05-24 | 江苏佳麦化工有限公司 | A kind of synthesis technology of benzaldehyde |
| CN211988661U (en) * | 2020-03-16 | 2020-11-24 | 安徽沙丰新材料有限公司 | Mixing equipment for preparing water-based zinc stearate |
| CN215511665U (en) * | 2021-07-28 | 2022-01-14 | 江西万年县万年青商砼有限公司 | High-efficient agitating unit is used in concrete production and processing |
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| CN114456049B (en) | 2023-02-17 |
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