CN108453110B - Preparation method of porous adsorption resin and fume hood - Google Patents

Preparation method of porous adsorption resin and fume hood Download PDF

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CN108453110B
CN108453110B CN201810098229.1A CN201810098229A CN108453110B CN 108453110 B CN108453110 B CN 108453110B CN 201810098229 A CN201810098229 A CN 201810098229A CN 108453110 B CN108453110 B CN 108453110B
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fume hood
weight
parts
exhaust
main body
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CN108453110A (en
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李小敏
李�杰
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Chongqing Baitao Steel Tool Co ltd
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Chongqing Baitao Steel Tool Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
    • B08B15/023—Fume cabinets or cupboards, e.g. for laboratories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
    • C08F265/10—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of amides or imides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F285/00—Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/346—Clay
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents

Abstract

The invention discloses an environment-friendly fume hood with an exhaust gas purification function, which is characterized by comprising a fume hood main body and an exhaust gas purification module, wherein an operation table is arranged in the fume hood main body; the waste gas purification module comprises a condensation reflux device and an organic liquid absorption device, and an inlet of the condensation reflux device is connected with an exhaust pipe; the organic liquid absorbing device is connected with the outlet of the condensing reflux device. The environment-friendly fume hood with the waste gas purifying function provided by the invention can prevent the problems of environmental pollution and the like caused by direct exhaust of waste gas while ensuring that gas in the fume hood is not diffused into a laboratory, and the waste gas purifying device provided by the invention is simple, low in installation cost and low in energy consumption.

Description

Preparation method of porous adsorption resin and fume hood
Technical Field
The invention relates to the technical field of experimental instruments, in particular to a preparation method of porous adsorption resin and a fume hood.
Background
Fume hoods, also known as fume hoods, are a large-scale device used in chemical laboratories to reduce contact between experimenters and harmful gases. Fume hoods are the primary barrier to protect personnel from toxic chemical fumes, and can be used as important safety backup equipment, like effectively exhausting harmful gases when chemical fumes, dust and toxic gases are generated during chemical experiment process failure, protecting staff and laboratory environment. The fume hood is provided with a fixed air volume fume hood and a variable air volume fume hood, the fixed air volume fume hood is manually set at the control convenience, the air exhaust volume is fixed, the variable air volume fume hood is limited by a certain experimental variety, the air speed is variable and adjustable, but the parameters such as temperature and pressure are manually monitored, otherwise, the safety performance is influenced, the degree of automation is not high enough, the open-loop operation is not as advantageous as the closed-loop intelligent control in the aspects of energy conservation and environmental protection, the closed-loop intelligent control is adopted to set parameters for different experiments, the automatic feedback and the program control of the parameters can be realized according to different stages of the experiments, the real-time adjustment of the air inlet volume and the air exhaust volume is further realized, the energy is saved, and the parameters such as the air temperature and the pressure in the interior can be monitored and fed back at any time. However, these conventional fume hoods do not have an exhaust gas treatment function, and if the exhaust gas is directly discharged, the exhaust gas may pollute the surrounding environment. At present, many scientific research buildings are high-rise buildings, waste gases are pumped to a roof by a fan for treatment, the pipeline installation cost is high, the equipment investment is large, and the energy consumption is high due to long tube pass and large resistance. And in pipeline transportation, if leakage occurs, pollution is generated to the surroundings.
Accordingly, based on the above-mentioned existing problems, the present invention provides a fume hood, in which an exhaust gas purifying device is provided at an exhaust gas discharge port to prevent environmental pollution caused by direct exhaust of exhaust gas, and the exhaust gas purifying device is simple, low in installation cost and low in energy consumption.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the preparation method of the porous adsorption resin and the fume hood, wherein the exhaust gas purifying device is arranged at the exhaust gas discharge port, so that the problems of environmental pollution and the like caused by direct exhaust of exhaust gas are prevented while the gas in the fume hood is prevented from diffusing into a laboratory.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect of the present invention, there is provided a method for preparing a porous adsorbent resin, comprising the steps of: (1) preparing a porous resin matrix: dissolving 35-55 parts by weight of acrylamide, 10-20 parts by weight of polyacrylamide, 5-10 parts by weight of sodium carboxymethyl starch, 3-5 parts by weight of sodium persulfate or potassium persulfate, 2-3 parts by weight of dicumyl peroxide and 15-20 parts by weight of filler in a proper amount of deionized water, stirring and mixing, adding 5 parts by weight of aluminum trichloride, heating to 80-85 ℃ under the protection of nitrogen, stirring and reacting until a gel state appears, then adding 10-15 parts by weight of potassium bicarbonate, and continuing stirring and reacting for 6-8 hours at constant temperature; the filler is prepared from the following components in percentage by mass: 1 and talc; (2) washing and drying: washing the reaction product in the step (1) with ethanol, drying at 70 ℃ for 30min under the vacuum degree of 0.1-0.3 MPa, drying at 130 ℃ for 90min, and grinding into microspheres with the average particle size of 10-50 mu m by a ball mill; (3) surface grafting: adding 0.3 part by weight of 2,2' -bipyridine, 15 parts by weight of glycerol methacrylate, 20 parts by weight of tetrahydrofuran and 0.15 part by weight of cuprous bromide into the microspheres obtained in the step (2), uniformly mixing and stirring, freezing and vacuumizing by liquid nitrogen, thawing, introducing nitrogen for circulation for 3 times, and reacting at the constant temperature of 80 ℃ for 3 hours; (4) complexation reaction: adding 100 parts of complexing reagent into the surface grafting reactant in the step (3), stirring to carry out complexing reaction, washing, and drying at 60 ℃ under the vacuum degree of 0.3 MPa; the complexing reagent is methanol, ethylenediamine tetraacetic acid and water in a ratio of 1:3:5 mass ratio of the mixed solution; (5) polymerization: and (3) placing the dried complex product in the step (4) into 30 parts by weight of iminodiacetic acid solution, adding 20 parts by weight of formaldehyde, adjusting the pH value of the mixed solution to 10, heating to 100 ℃, stirring to react for 10 hours, adjusting the pH value of the mixed solution to 4 after the reaction is finished, standing and ageing for 1 hour, filtering, washing and vacuum drying to obtain the porous adsorption resin.
The porous adsorption resin prepared by the invention can not only absorb organic liquid, but also adsorb polycyclic aromatic hydrocarbon.
The invention provides a fume hood, which comprises a fume hood main body and an exhaust gas purification module, wherein an operation table is arranged in the fume hood main body, an exhaust hood is arranged at the top end of the inside of the fume hood main body, an exhaust pipe is connected to an exhaust port of the exhaust hood, the exhaust pipe is arranged outside the fume hood main body, and a downward-pulling type isolation glass plate is arranged at the front side of the fume hood main body; the waste gas purification module comprises a condensation reflux device and an organic liquid absorption device, and an inlet of the condensation reflux device is connected with the exhaust pipe; the organic liquid absorbing device is connected with the outlet of the condensing and refluxing device, the inlet level of the condensing and refluxing device is higher than the outlet level of the condensing and refluxing device, and porous adsorption resin is filled in the organic liquid absorbing device. The waste gas is discharged through the exhaust pipe and then passes through the condensation reflux device, wherein low-boiling-point organic substances are condensed and refluxed into liquid, and then the liquid is absorbed by the organic liquid absorbing device and then purified gas is discharged.
Further, a drain hole is formed in the operation table and is connected with the drain pipeline, the drain pipeline consists of a first drain pipeline, a baffle plate, a storage bin, a rear door cover and a second drain pipeline, the baffle plate is obliquely arranged between the first drain pipeline and the second drain pipeline, the baffle plate is connected with the storage bin, and the storage bin is connected with the rear door cover; the baffle is net-shaped. The drain of the laboratory can cause a large laboratory accident after being blocked, and because of the special environment of the laboratory, the drain pipe blockage is overhauled, so that great financial and material resources are required. According to the invention, an anti-blocking device is adopted, a grid baffle is arranged in a drainage pipeline, and a storage bin is arranged, so that when blocking occurs, a rear door cover is only required to be opened for impurity cleaning.
Further, guide grooves are formed in the left side and the right side of the main body of the fume chamber, and the fixing rods are in sliding connection with the guide grooves.
Further, the condensation reflux apparatus is supported by a jig provided at the top end of the main body of the fume hood. The clamp comprises a clamp and a telescopic rod. Support through anchor clamps, can make condensation reflux unit more firm, and adopt the mode of telescopic link, can utilize flexible come the angle of adjustment condensation reflux unit, be convenient for realize the installation of exhaust duct under the different environment.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
1. the invention provides a fume hood, which comprises a fume hood main body and an exhaust gas purification module, wherein the exhaust gas purification module comprises a condensation reflux device and an organic liquid absorption device, exhaust gas is discharged through an exhaust pipe and then passes through the condensation reflux device, wherein low-boiling-point organic substances are condensed and refluxed into liquid, and the liquid is absorbed through the organic liquid absorption device and then the purified gas is discharged. And the organic liquid absorbing device is filled with porous adsorption resin, so that the organic liquid absorbing device not only can absorb organic liquid, but also can absorb polycyclic aromatic hydrocarbon. The problems of environmental pollution and the like caused by direct exhaust of waste gas are prevented while the fact that the gas in the fume hood is not diffused into a laboratory is ensured. The invention adds the condensing reflux device and the porous adsorption resin at the exhaust port, and has the advantages of simple device, low installation cost and low energy consumption.
2. The drain of the laboratory can cause a large laboratory accident after being blocked, and because of the special environment of the laboratory, the drain pipe blockage is overhauled, so that great financial and material resources are required. According to the invention, an anti-blocking device is adopted, a grid baffle is arranged in a drainage pipeline, and a storage bin is arranged, so that when blocking occurs, a rear door cover is only required to be opened for impurity cleaning.
3. The condensing reflux device is supported by the clamp, so that the condensing reflux device is more stable, and the angle of the condensing reflux device can be adjusted by means of expansion and contraction by adopting a telescopic rod mode, so that the installation of exhaust pipelines in different environments is facilitated.
Drawings
Fig. 1 is a front view of a fume hood
FIG. 2 is a schematic diagram of an exhaust purification module
Fig. 3 and 4 are schematic views of the guide groove and the fixing rod
FIG. 5 is a schematic view of a drain pipe
In the figure, a fume hood main body 1, an exhaust gas purification module 2, an operation table 11, an exhaust hood 12, an exhaust port 121, an exhaust duct 13, a down-draw type insulating glass plate 14, a condensation reflux apparatus 21, an organic liquid absorbing apparatus 22, a condensation reflux apparatus inlet 211, a condensation reflux apparatus outlet 212, a drain hole 15, a drain pipe 16, a first drain pipe 161, a baffle 162, a storage bin 163, a rear door cover 164, a second drain pipe 165, a guide groove 17, a fixing rod 18, a clamp 19, a clamp 191, and a telescopic rod 192.
Detailed Description
In order to make the technical scheme and gist of the present invention more clear, the following further describes the embodiments of the present invention in detail.
The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.
Example 1 preparation of porous adsorption resin
The preparation method of the porous adsorption resin comprises the following steps:
(1) Preparing a porous resin matrix: dissolving 35-55 parts by weight of acrylamide, 10-20 parts by weight of polyacrylamide, 5-10 parts by weight of sodium carboxymethyl starch, 3-5 parts by weight of sodium persulfate or potassium persulfate, 2-3 parts by weight of dicumyl peroxide and 15-20 parts by weight of filler in a proper amount of deionized water, stirring and mixing, adding 5 parts by weight of aluminum trichloride, heating to 80-85 ℃ under the protection of nitrogen, stirring and reacting until a gel state appears, then adding 10-15 parts by weight of potassium bicarbonate, and continuing stirring and reacting for 6-8 hours at constant temperature; the filler is prepared from the following components in percentage by mass: 1 and talc;
(2) Washing and drying: washing the reaction product in the step (1) with ethanol, drying at 70 ℃ for 30min under the vacuum degree of 0.1-0.3 MPa, drying at 130 ℃ for 90min, and grinding into microspheres with the average particle size of 10-50 mu m by a ball mill;
(3) Surface grafting: adding 0.3 part by weight of 2,2' -bipyridine, 15 parts by weight of glycerol methacrylate, 20 parts by weight of tetrahydrofuran and 0.15 part by weight of cuprous bromide into the microspheres obtained in the step (2), uniformly mixing and stirring, freezing and vacuumizing by liquid nitrogen, thawing, introducing N2 gas, circulating for 3 times, and reacting at the constant temperature of 80 ℃ for 3 hours;
(4) Complexing reaction: adding 100 parts of complexing reagent into the surface grafting reactant in the step (3), stirring to carry out complexing reaction, washing, and drying at 60 ℃ under the vacuum degree of 0.3 MPa; the complexing reagent is methanol, ethylenediamine tetraacetic acid and water in a ratio of 1:3:5 mass ratio of the mixed solution;
(5) Polymerization reaction: and (3) placing the dried complex product in the step (4) into 30 parts by weight of iminodiacetic acid solution, adding 20 parts by weight of formaldehyde, adjusting the pH value of the mixed solution to 10, heating to 100 ℃, stirring to react for 10 hours, adjusting the pH value of the mixed solution to 4 after the reaction is finished, standing and ageing for 1 hour, filtering, washing and vacuum drying to obtain the porous adsorption resin.
EXAMPLE 2 fume hood (porous adsorbent resin prepared in example 1)
The utility model provides a fume hood, includes fume hood main part 1 and exhaust purification module 2, be provided with operation panel 11 in the fume hood main part 1, the inside top of fume hood main part 1 is equipped with exhaust hood 12, exhaust port 121 department of exhaust hood 12 is connected with exhaust pipe 13, exhaust pipe 13 set up in the fume hood main part 1 is outside, fume hood main part 1 front side is equipped with drop-down insulating glass board 14; the exhaust gas purification module 2 comprises a condensation reflux device 21 and an organic liquid absorption device 22, wherein an inlet 211 of the condensation reflux device is connected with the exhaust pipe 13; the organic liquid absorbing device 22 is connected with the outlet 212 of the condensation reflux device, the level of the inlet 211 of the condensation reflux device is higher than that of the outlet 212 of the condensation reflux device, and the organic liquid absorbing device 22 is filled with an adsorption material. The adsorption material is porous adsorption resin. The operation table 11 is provided with a drain hole 15, the drain hole 15 is connected with a drain pipeline 16, the drain pipeline 16 is composed of a first drain pipeline 161, a baffle 162, a storage bin 163, a rear door cover 164 and a second drain pipeline 165, the baffle 162 is obliquely arranged between the first drain pipeline 161 and the second drain pipeline 165, the baffle 162 is connected with the storage bin 163, and the storage bin 163 is connected with the rear door cover 164; the baffle 162 is mesh-like. The inside guide way 17 that all is equipped with in the left and right sides of fume chamber main part 1, dead lever 18 with guide way 17 sliding connection. The condensation reflux apparatus is supported by a jig 19 provided at the top end of the fume hood main body 1. The clamp 19 includes a clip 191 and a telescoping rod 192.
In this embodiment, the condensation reflux apparatus should be understood in a broad sense, for example, the condensation reflux apparatus may be a spherical condensation pipe or a straight condensation pipe.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.

Claims (6)

1. A preparation method of porous adsorption resin comprises the following steps:
(1) Preparing a porous resin matrix: dissolving 35-55 parts by weight of acrylamide, 10-20 parts by weight of polyacrylamide, 5-10 parts by weight of sodium carboxymethyl starch, 3-5 parts by weight of sodium persulfate or potassium persulfate, 2-3 parts by weight of dicumyl peroxide and 15-20 parts by weight of filler in a proper amount of deionized water, stirring and mixing, adding 5 parts by weight of aluminum trichloride, heating to 80-85 ℃ under the protection of nitrogen, stirring and reacting until a gel state appears, then adding 10-15 parts by weight of potassium bicarbonate, and continuing stirring and reacting for 6-8 hours at constant temperature; the filler is prepared from the following components in percentage by mass: 1 and talc;
(2) Washing and drying: washing the reaction product in the step (1) with ethanol, drying at 70 ℃ for 30min under the vacuum degree of 0.1-0.3 MPa, drying at 130 ℃ for 90min, and grinding into microspheres with the average particle size of 10-50 mu m by a ball mill;
(3) Surface grafting: adding 0.3 part by weight of 2,2' -bipyridine, 15 parts by weight of glycerol methacrylate, 20 parts by weight of tetrahydrofuran and 0.15 part by weight of cuprous bromide into the microspheres obtained in the step (2), uniformly mixing and stirring, freezing and vacuumizing by liquid nitrogen, thawing, introducing nitrogen for circulation for 3 times, and reacting at the constant temperature of 80 ℃ for 3 hours;
(4) Complexing reaction: adding 100 parts of complexing reagent into the surface grafting reactant in the step (3), stirring to carry out complexing reaction, washing, and drying at 60 ℃ under the vacuum degree of 0.3 MPa; the complexing reagent is methanol, ethylenediamine tetraacetic acid and water in a ratio of 1:3:5 mass ratio of the mixed solution;
(5) Polymerization reaction: and (3) placing the dried complex product in the step (4) into 30 parts by weight of iminodiacetic acid solution, adding 20 parts by weight of formaldehyde, adjusting the pH value of the mixed solution to 10, heating to 100 ℃, stirring to react for 10 hours, adjusting the pH value of the mixed solution to 4 after the reaction is finished, standing and ageing for 1 hour, filtering, washing and vacuum drying to obtain the porous adsorption resin.
2. A fume hood, which is provided with porous adsorption resin obtained by the preparation method according to claim 1, and is characterized by comprising a fume hood main body (1) and an exhaust gas purification module (2), wherein an operation table (11) is arranged in the fume hood main body (1), an exhaust hood (12) is arranged at the top end inside the fume hood main body (1), an exhaust pipe (13) is connected at an exhaust outlet (121) of the exhaust hood (12), the exhaust pipe (13) is arranged outside the fume hood main body (1), and a downward-pulling type isolation glass plate (14) is arranged at the front side of the fume hood main body (1); the waste gas purification module (2) comprises a condensation reflux device (21) and an organic liquid absorption device (22), and an inlet (211) of the condensation reflux device is connected with the exhaust pipe (13); the organic liquid absorbing device (22) is connected with the outlet (212) of the condensing reflux device, the horizontal height of the inlet (211) of the condensing reflux device is higher than that of the outlet (212) of the condensing reflux device, and the organic liquid absorbing device (22) is filled with porous adsorption resin.
3. The fume hood according to claim 2, wherein the operation table (11) is provided with a drain hole (15), the drain hole (15) is connected with a drain pipe (16), the drain pipe (16) is composed of a first drain pipe (161), a baffle (162), a storage bin (163), a rear door cover (164) and a second drain pipe (165), the baffle (162) is obliquely arranged between the first drain pipe (161) and the second drain pipe (165), the baffle (162) is connected with the storage bin (163), and the storage bin (163) is connected with the rear door cover (164); the baffle (162) is net-shaped.
4. A fume hood according to claim 2, characterized in that the inside of the left and right sides of the fume hood main body (1) is provided with guide grooves (17), and the fixing rod (18) is slidably connected with the guide grooves (17).
5. A fume hood according to claim 2, characterised in that said condensation reflux means are supported by a clamp (19) provided at the top end of the fume hood body (1).
6. A fume hood according to claim 5, characterized in that said clamp (19) comprises a clamp (191) and a telescopic rod (192).
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