CN111701281A - Acrylic acid purification lightness-removing tower - Google Patents
Acrylic acid purification lightness-removing tower Download PDFInfo
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- CN111701281A CN111701281A CN202010673293.5A CN202010673293A CN111701281A CN 111701281 A CN111701281 A CN 111701281A CN 202010673293 A CN202010673293 A CN 202010673293A CN 111701281 A CN111701281 A CN 111701281A
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- acrylic acid
- lightness
- acid purification
- fixedly connected
- tower body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/68—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements
- B01D46/681—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements by scrapers, brushes or the like
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
- C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
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- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Thermal Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to the field of light component removal towers, in particular to an acrylic acid purification light component removal tower, which comprises an acrylic acid purification light component removal tower body, a rectifying section sieve plate, a filter screen mechanism, a cooling mechanism and a separating mechanism, wherein the middle part of the acrylic acid purification light component removal tower body is fixedly connected with a feeding pipe which is mutually communicated with the interior of the acrylic acid purification light component removal tower body, and the top of the acrylic acid purification light component removal tower body is provided with an air outlet pipe; the rectifying section sieve plate is arranged in the acrylic acid purification lightness-removing tower body, and the rectifying section sieve plate is positioned above the feeding pipe; the filter screen mechanism is arranged in the acrylic acid purification lightness-removing tower body and is positioned above the feeding pipe; the cooling mechanism is connected with the acrylic acid purification lightness-removing tower body; the separation mechanism is connected inside the acrylic acid purification lightness-removing tower body. The acrylic acid purification and lightness-removing tower provided by the invention has the advantages of short production period of acrylic acid and capability of reducing the probability of blocking a sieve plate at a rectification section.
Description
Technical Field
The invention relates to the field of light component removal towers, in particular to a light component removal tower for purifying acrylic acid.
Background
Acrylic acid is an unsaturated organic acid, and contains carbon-carbon double bonds and carboxyl structures in molecules, so that a series of compounds can be derived to form a large class of acrylic acid products. At present, the acrylic acid industry with unique characteristics is formed in the field of modern chemical industry, and the acrylic acid industry becomes an important derivative of propylene like polypropylene, acrylonitrile and propylene oxide. The excellent polymerization and esterification capability of the acrylic acid provides an extremely important intermediate for the synthesis and preparation of various fine chemicals.
At present, acrylic acid is generally purified by a double-tower method, a light component removal tower is needed by the method, when the existing acrylic acid purification light component removal tower is used, a mixed solution containing toluene and water at the bottom of the existing acrylic acid purification light component removal tower is separated in a liquid receiving tank by a standing and layering method, the method has long time for separating toluene from water, the production period of acrylic acid is prolonged, and the production efficiency of acrylic acid is reduced. Therefore, it is necessary to provide a new acrylic acid purification and lightness-removing column to solve the above technical problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an acrylic acid purification and lightness-removing tower.
The technical scheme adopted by the invention for solving the technical problems is as follows: an acrylic acid purification and lightness-removing tower comprises an acrylic acid purification and lightness-removing tower body, a rectifying section sieve plate, a filter screen mechanism, a cooling mechanism and a separating mechanism, wherein the middle part of the acrylic acid purification and lightness-removing tower body is fixedly connected with a feeding pipe which is mutually communicated with the inside of the acrylic acid purification and lightness-removing tower body, and the top of the acrylic acid purification and lightness-removing tower body is provided with an air outlet pipe; the rectifying section sieve plate is arranged in the acrylic acid purification lightness-removing tower body, and the rectifying section sieve plate is positioned above the feeding pipe; the filter screen mechanism is arranged in the acrylic acid purification lightness-removing tower body and is positioned above the feeding pipe; the top of the filter screen mechanism is provided with the rectifying section sieve plate, and the cooling mechanism is connected with the acrylic acid purification and lightness-removing tower body; the separation mechanism is connected inside the acrylic acid purification lightness-removing tower body and comprises an annular ripple connecting cover, a stripping section sieve plate, a separation box, a limiting rod, a connecting rod, a moving frame, a disc and a lug, wherein the inner bottom wall of the acrylic acid purification lightness-removing tower body is connected with the separation box with an opening at the upper end in a sliding way through the limiting rod, a plurality of stripping section sieve plates which are arranged in a staggered way and play a role of baffling are fixedly connected in the separation box, the upper surface of the separation box is fixedly connected with the annular ripple connecting cover, and the other end of the annular ripple connecting cover is fixedly connected with the inner wall of the acrylic acid purification lightness-removing tower body; the utility model discloses an acrylic acid purification takes off light tower body, including the bottom of acrylic acid purification and takes off light tower body, the bottom of separation box is located to the limiting rod, the inner diapire fixedly connected with driving motor of acrylic acid purification, one side rotation center of driving motor's output fixed connection disc, and disc and driving motor face fixedly connected with lug to the back, lug sliding connection in the spout that central point put and set up in the motion frame, and the one end of motion frame fixed connection connecting rod, the other end and the limiting rod of connecting rod are connected, just the bottom of separation box is.
Preferably, the separation mechanism further comprises a spring, and the outer surface of the separation box is connected with the inner wall of the acrylic acid purification and lightness-removing tower body through the spring.
Preferably, the cooling mechanism comprises a water outlet pipe, a baffle plate, a water tank and a water inlet pipe, the water tank is fixedly connected to the outer surface of the bottom of the acrylic acid purification lightness-removing tower body, the baffle plates are fixedly connected in the water tank and are uniformly distributed, the water inlet pipe is fixedly connected to the outer surface of the bottom of the water tank and is communicated with the inner portion of the water tank, and the water outlet pipe is fixedly connected to the outer surface of the water tank, which is close to the top of the water tank.
Preferably, the filter screen mechanism comprises a cleaning brush, a filter screen, a worm gear, a rotating shaft, a driven wheel, a belt, a driving wheel and a motor, the filter screen is fixedly connected in the acrylic acid purification and lightness removal tower body, the lower surface of the filter screen is rotatably connected with one end of the rotating shaft, the other end of the rotating shaft is fixedly connected with one side rotating center of the worm gear, and the rotating shaft is fixedly connected with the cleaning brush for cleaning the filter screen; the worm wheel is meshed with a horizontally arranged worm, and the worm penetrates through the acrylic acid purification and lightness-removing tower body and is rotationally connected with the acrylic acid purification and lightness-removing tower body; the penetrating end of the worm is fixedly connected with a rotating center at one side of the driven wheel, the outer surface of the acrylic acid purification and lightness-removing tower body is fixedly connected with a motor, the output end of the motor is fixedly connected with a rotating center at one side of the driving wheel, and the driving wheel is in transmission connection with the driven wheel through a belt.
Preferably, the worm is rotatably connected with the acrylic acid purification and lightness-removing tower body through a sealing bearing, a sealing ring is fixedly connected at the joint of the sealing bearing and the acrylic acid purification and lightness-removing tower body, and the lower surface of the acrylic acid purification and lightness-removing tower body is fixedly connected with the support.
Compared with the related technology, the acrylic acid purification and lightness-removing tower provided by the invention has the following beneficial effects:
(1) in the invention, the toluene and the water in the bottom mixed liquid are subjected to zigzag collision, so that fine toluene liquid drops are gathered, the particle size of the toluene liquid drops is increased, the toluene separation speed is increased, the production period of acrylic acid is shortened, and the production efficiency of the acrylic acid is improved.
(2) The invention can cool the bottom of the acrylic acid purifying and light component removing tower body, reduce the polymerization tendency of acrylic acid at the bottom of the acrylic acid purifying and light component removing tower body, reduce the loss of acrylic acid and further improve the production capacity of acrylic acid; can filter the polymer through the filter screen, reduce the probability that the polymer blockked up the rectifying column sieve, improve the reliability that the device used, and can clean the filter screen through the brush cleaner to reduce the probability that the filter screen took place to block up, guarantee filter screen filter effect's long-term stability.
Drawings
FIG. 1 is a schematic structural view of a preferred embodiment of an acrylic acid purification and lightness-removing column provided in the present invention;
FIG. 2 is a schematic structural view of the screen mechanism shown in FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a schematic structural view of the separating mechanism shown in FIG. 1;
fig. 5 is a partially enlarged view of B in fig. 4.
Reference numbers in the figures: 1. a light component removal tower body for acrylic acid purification; 2. a rectifying section sieve plate; 3. a filter screen mechanism; 31. cleaning with a brush; 32. a filter screen; 33. a worm; 34. a worm gear; 35. a rotating shaft; 36. a driven wheel; 37. a belt; 38. a driving wheel; 39. an electric motor; 4. a cooling mechanism; 41. a water outlet pipe; 42. a baffle plate; 43. a water tank; 44. a water inlet pipe; 5. a support; 6. an air outlet pipe; 7. a feed pipe; 8. a separating mechanism; 81. an annular corrugated connecting cover; 82. a spring; 83. sieve plates of the stripping section; 84. a separation tank; 85. a limiting rod; 86. a connecting rod; 87. a motion frame; 88. a disc; 89. and (4) a bump.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, an acrylic acid purifying and light component removing tower comprises an acrylic acid purifying and light component removing tower body 1, a rectifying section sieve plate 2, a filter screen mechanism 3, a cooling mechanism 4 and a separating mechanism 8, wherein the middle part of the acrylic acid purifying and light component removing tower body 1 is fixedly connected with a feeding pipe 7 communicated with the inside thereof, and the top of the acrylic acid purifying and light component removing tower body 1 is provided with an air outlet pipe 6; the rectifying section sieve plate 2 is arranged in the acrylic acid purification and lightness-removing tower body 1, and the rectifying section sieve plate 2 is positioned above the feeding pipe 7; the filter screen mechanism 3 is arranged in the acrylic acid purification and lightness removal tower body 1, and the filter screen mechanism 3 is positioned above the feeding pipe 7; the top of the filter screen mechanism 3 is provided with the rectifying section sieve plate 2, the cooling mechanism 4 is connected with the acrylic acid purifying and light-weight removing tower body 1, and the separating mechanism 8 is connected inside the acrylic acid purifying and light-weight removing tower body 1.
In the specific implementation process, as shown in fig. 1, 4 and 5, the separation mechanism 8 includes an annular ripple connection cover 81, a stripping section sieve plate 83, a separation box 84, a limiting rod 85, a connecting rod 86, a moving frame 87, a disc 88 and a bump 89, the inner bottom wall of the acrylic acid purification lightness-removing column body 1 is slidably connected with the separation box 84 with an upper end opening through the limiting rod 85, a plurality of stripping section sieve plates 83 which are staggered and play a role of baffling are fixedly connected in the separation box 84, the upper surface of the separation box 84 is fixedly connected with the annular ripple connection cover 81, and the other end of the annular ripple connection cover 81 is fixedly connected with the inner wall of the acrylic acid purification lightness-removing column body 1; the inner bottom wall of the acrylic acid purification lightness-removing tower body 1 is fixedly connected with a driving motor, the output end of the driving motor is fixedly connected with one side rotating center of a disc 88, the disc 88 and the back surface of the driving motor are fixedly connected with a lug 89, the lug 89 is slidably connected in a chute arranged at the central position in a moving frame 87, the moving frame 87 is fixedly connected with one end of a connecting rod 86, the other end of the connecting rod 86 is connected with a limiting rod 85, the limiting rod 85 is arranged at the bottom of a separation box 84, when the device is used, the upper surface of a sieve plate 83 of a stripping section is fixedly connected with a zigzag baffle plate, the disc 88 rotates through the work of the driving motor, the moving frame 87 reciprocates in the horizontal direction under the action of the lug 89, the separation box 84 reciprocates in the horizontal direction under the action of the connecting rod 86 and the limiting rod 85, so that a mixed liquid containing toluene and water entering the separation box 84 shakes, at the moment, the toluene and the water in the mixed solution generate zigzag collision, so that fine toluene droplets are gathered, the particle size of the toluene droplets is increased, the toluene separation speed is increased, the production period of the acrylic acid is shortened, and the production efficiency of the acrylic acid is improved.
Referring to fig. 4, the separation mechanism 8 further includes a spring 82, an outer surface of the separation box 84 is connected to an inner wall of the acrylic acid purification and lightness removing column body 1 through the spring 82, and the spring 82 plays a role of buffering, so that the movement of the separation box 84 is more stable.
Referring to fig. 1, the cooling mechanism 4 includes a water outlet pipe 41, a baffle plate 42, a water tank 43 and a water inlet pipe 44, the water tank 43 is fixedly connected to the outer surface of the bottom of the acrylic acid purification and lightness removal tower body 1, the baffle plate 42 is fixedly connected to the inner portion of the water tank 43, the water inlet pipe 44 is fixedly connected to the outer surface of the bottom of the water tank 43 and is communicated with the inner portion of the water tank 43, the water outlet pipe 41 is fixedly connected to the outer surface of the water tank 43 near the top of the water tank 43 and is communicated with the inner portion of the water tank, external cooling water enters the water tank 43 through the water inlet pipe 44, is baffled by the baffle plate 42 and is finally discharged through the water outlet pipe 41, so that the bottom of the acrylic acid purification and lightness removal tower body 1 can be cooled, the polymerization tendency.
Referring to fig. 1, 2 and 3, the filter screen mechanism 3 includes a cleaning brush 31, a filter screen 32, a worm 33, a worm wheel 34, a rotating shaft 35, a driven wheel 36, a belt 37, a driving wheel 38 and a motor 39, the filter screen 32 is fixedly connected in the acrylic acid purification and lightness removal tower body 1, the lower surface of the filter screen 32 is rotatably connected with one end of the rotating shaft 35, the other end of the rotating shaft 35 is fixedly connected with a rotating center at one side of the worm wheel 34, and the rotating shaft 35 is fixedly connected with the cleaning brush 31 for cleaning the filter screen 32; the worm wheel 34 is meshed with the horizontally arranged worm 33, and the worm 33 penetrates through the acrylic acid purification and lightness removal tower body 1 and is rotationally connected with the acrylic acid purification and lightness removal tower body 1; the penetrating end of the worm 33 is fixedly connected with a rotation center at one side of the driven wheel 36, the outer surface of the acrylic acid purification and lightness-removing tower body 1 is fixedly connected with the motor 39, the output end of the motor 39 is fixedly connected with a rotation center at one side of the driving wheel 38, the driving wheel 38 is in transmission connection with the driven wheel 36 through the belt 37, polymers can be filtered through the filter screen 32, the probability that the polymers block the sieve plate 2 at the rectification section is reduced, the use reliability of the device is improved, the driving wheel 38 works through the motor 39, the driven wheel 36 and the worm 33 rotate under the action of the belt 37, the worm wheel 34 is in transmission with the worm 33, the rotating shaft 35 and the cleaning brush 31 rotate, the filter screen 32 can be cleaned through the cleaning brush 31, the probability that the filter screen 32 is blocked is reduced, and the long-term.
Referring to fig. 3, the worm 33 is rotatably connected with the acrylic acid purification and lightness-removing column body 1 through a sealing bearing, and a sealing ring is fixedly connected at the joint of the sealing bearing and the acrylic acid purification and lightness-removing column body 1 to ensure that the joint of the sealing bearing and the acrylic acid purification and lightness-removing column body 1 is sealed, the lower surface of the acrylic acid purification and lightness-removing column body 1 is fixedly connected with the support 5, and the support 5 plays a supporting role.
The working principle of the acrylic acid purification and lightness-removing tower provided by the invention is as follows: when the device is used, the upper surface of the sieve plate 83 of the stripping section is fixedly connected with a zigzag baffle, the disc 88 rotates through the work of the driving motor, the moving frame 87 reciprocates in the horizontal direction under the action of the bump 89, and the separating box 84 reciprocates in the horizontal direction under the action of the connecting rod 86 and the limiting rod 85, so that the mixed liquid containing toluene and water entering the separating box 84 shakes, the toluene and the water in the mixed liquid generate zigzag collision at the moment, fine toluene liquid drops are gathered, the particle size of the toluene liquid drops is increased, the speed of toluene separation is increased, the production period of acrylic acid is shortened, and the production efficiency of acrylic acid is improved; when the device is used, external cooling water enters the water tank 43 through the water inlet pipe 44, is baffled through the baffle plate 42 and is finally discharged through the water outlet pipe 41, so that the bottom of the acrylic acid purification and lightness removal tower body 1 can be cooled, the polymerization tendency of acrylic acid at the bottom of the acrylic acid purification and lightness removal tower body 1 is reduced, the loss of the acrylic acid is reduced, and the production capacity of the acrylic acid is improved; this device can filter the polymer through filter screen 32, reduce the polymer and block up the probability of rectification section sieve 2, the reliability of the use of the device is improved, and work through motor 39, make action wheel 38 rotate, make under the effect of belt 37 and rotate from driving wheel 36 and worm 33, through worm wheel 34 and worm 33 transmission, make pivot 35 and cleaning brush 31 rotate, can clean filter screen 32 through cleaning brush 31, thereby reduce the probability that filter screen 32 takes place to block up, guarantee the long-term stability of filter screen 32 filter effect.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. An acrylic acid purification and lightness-removing tower is characterized by comprising an acrylic acid purification and lightness-removing tower body (1), a rectifying section sieve plate (2), a filter screen mechanism (3), a cooling mechanism (4) and a separating mechanism (8), wherein the middle part of the acrylic acid purification and lightness-removing tower body (1) is fixedly connected with a feeding pipe (7) which is mutually communicated with the inside of the acrylic acid purification and lightness-removing tower body, and the top of the acrylic acid purification and lightness-removing tower body (1) is provided with an air outlet pipe (6); the rectifying section sieve plate (2) is arranged in the acrylic acid purification and lightness-removing tower body (1), and the rectifying section sieve plate (2) is positioned above the feeding pipe (7); the filter screen mechanism (3) is arranged in the acrylic acid purification and lightness removal tower body (1), and the filter screen mechanism (3) is positioned above the feeding pipe (7); the top of the filter screen mechanism (3) is provided with the rectifying section sieve plate (2), and the cooling mechanism (4) is connected with the acrylic acid purification and lightness-removing tower body (1); the separation mechanism (8) is connected inside the acrylic acid purification lightness-removing column body (1), the separation mechanism (8) comprises an annular ripple connecting cover (81), a stripping section sieve plate (83), a separation box (84), a limiting rod (85), a connecting rod (86), a moving frame (87), a disc (88) and a bump (89), the inner bottom wall of the acrylic acid purification lightness-removing column body (1) is connected with the separation box (84) with an opening at the upper end in a sliding mode through the limiting rod (85), a plurality of stripping section sieve plates (83) which are arranged in a staggered mode and play a role in baffling are fixedly connected in the separation box (84), the upper surface of the separation box (84) is fixedly connected with the annular ripple connecting cover (81), and the other end of the annular ripple connecting cover (81) is fixedly connected with the inner wall of the acrylic acid purification lightness-removing column body (1); interior diapire fixedly connected with driving motor of acrylic acid purification lightness-removing column body (1), one side rotation center of driving motor's output fixed connection disc (88), and disc (88) and driving motor face fixedly connected with lug (89) dorsad, lug (89) sliding connection is in the spout that central point put and seted up in motion frame (87), and the one end of motion frame (87) fixed connection connecting rod (86), and the other end and the gag lever post (85) of connecting rod (86) are connected, just the bottom of separator box (84) is located to gag lever post (85).
2. The column for purifying and removing light weight acrylic acid as claimed in claim 1, wherein said separation mechanism (8) further comprises a spring (82), and an outer surface of said separation tank (84) is connected to an inner wall of said column body (1) for purifying and removing light weight acrylic acid through said spring (82).
3. The acrylic acid purifying and light component removing tower as claimed in claim 1, wherein the cooling mechanism (4) comprises a water outlet pipe (41), baffle plates (42), a water tank (43) and a water inlet pipe (44), the outer surface of the bottom of the acrylic acid purifying and light component removing tower body (1) is fixedly connected with the water tank (43), the baffle plates (42) are fixedly connected in the water tank (43) and are uniformly distributed, the outer surface of the bottom of the water tank (43) is fixedly connected with the water inlet pipe (44) which is mutually communicated with the inside of the water tank, and the outer surface of the water tank (43) close to the top of the water tank is fixedly connected with the water outlet pipe (41.
4. The acrylic acid purifying and lightness-removing tower according to claim 1, wherein the filter screen mechanism (3) comprises a cleaning brush (31), a filter screen (32), a worm (33), a worm gear (34), a rotating shaft (35), a driven wheel (36), a belt (37), a driving wheel (38) and a motor (39), the filter screen (32) is fixedly connected in the acrylic acid purifying and lightness-removing tower body (1), the lower surface of the filter screen (32) is rotatably connected with one end of the rotating shaft (35), the other end of the rotating shaft (35) is fixedly connected with the rotating center of one side of the worm gear (34), and the rotating shaft (35) is fixedly connected with the cleaning brush (31) for cleaning the filter screen (32); the worm wheel (34) is meshed with a horizontally arranged worm (33), and the worm (33) penetrates through the acrylic acid purification and lightness-removing tower body (1) and is rotationally connected with the acrylic acid purification and lightness-removing tower body (1); the penetrating end of the worm (33) is fixedly connected with a rotating center at one side of the driven wheel (36), the outer surface of the acrylic acid purification and lightness-removing tower body (1) is fixedly connected with a motor (39), the output end of the motor (39) is fixedly connected with a rotating center at one side of the driving wheel (38), and the driving wheel (38) is in transmission connection with the driven wheel (36) through a belt (37).
5. The acrylic acid purifying and light-weight removing tower as claimed in claim 4, wherein the worm (33) is rotatably connected with the acrylic acid purifying and light-weight removing tower body (1) through a sealing bearing, a sealing ring is fixedly connected at the joint of the sealing bearing and the acrylic acid purifying and light-weight removing tower body (1), and the lower surface of the acrylic acid purifying and light-weight removing tower body (1) is fixedly connected with the bracket (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010673293.5A CN111701281B (en) | 2020-07-14 | 2020-07-14 | Acrylic acid purification lightness-removing tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010673293.5A CN111701281B (en) | 2020-07-14 | 2020-07-14 | Acrylic acid purification lightness-removing tower |
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| CN111701281B CN111701281B (en) | 2023-03-24 |
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Effective date of registration: 20230301 Address after: No. 109, Liuyanghe Road, Xinbei District, Changzhou City, Jiangsu Province 213000 Applicant after: Aishengke (Jiangsu) Chemical Technology Co.,Ltd. Address before: Nanjing University of Aeronautics and Astronautics, 29 Yudao street, Qinhuai District, Nanjing City, Jiangsu Province, 210000 Applicant before: Zhong Jun |
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