CN105214444A - A kind of pressure swing adsorption method reclaims the method for toluene in tail gas - Google Patents
A kind of pressure swing adsorption method reclaims the method for toluene in tail gas Download PDFInfo
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- CN105214444A CN105214444A CN201510781652.8A CN201510781652A CN105214444A CN 105214444 A CN105214444 A CN 105214444A CN 201510781652 A CN201510781652 A CN 201510781652A CN 105214444 A CN105214444 A CN 105214444A
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Abstract
The invention discloses a kind of method that pressure swing adsorption method reclaims toluene in tail gas, method comprises the following steps: (1) is wrapped steam-laden benzene tail gas and first entered in dehumidifier and remove water vapour, pass into the first pressure-swing absorber, adsorption tower internal fixtion has adsorbent, enter the second pressure-swing absorber subsequently, adsorption tower internal fixtion has adsorbent, (2) after toluene absorption completely, first and second pressure-swing absorbers are carried out transformation desorption, and the adsorbent in adsorption tower is bentone adsorbent.Owing to have employed specific compound adsorbent, to have benzene adsorption rate high for reclaiming benzene for the method, and the gas of discharge is up to state standards completely, improves the economic and social benefit of enterprise.
Description
Technical field
The present invention relates to a kind of method that pressure swing adsorption method reclaims toluene in tail gas.
Background technology
Toluene is organic compound, and belong to aromatic hydrocarbon, molecular formula is C
6h
5cH
3, toluene is at normal temperatures in liquid, colourless, inflammable.Its boiling point is 110.8 DEG C, and freezing point is-95 DEG C, and density is 0.866 gram per centimeter
3.Its freezing point is lower than water, and boiling point is higher than the boiling point of water again, and toluene insoluble in water, but is dissolved in the solvent of ethanol and benzene.The steam of toluene is poisonous, can be worked the mischief by respiratory tract to human body, will prevent it from entering respiratory apparatus when using and produce.But the defects such as the such as rate of recovery is low, cost is high, weak effect that the method for existing recovery toluene also exists.
CN03159299 disclose a kind of using the toluene waste gas in industrial production as raw materials recovery, the method for integrated treatment environmental pollution.Processing step is: the toluene waste gas of 1) being discharged by exhaust blower enters filter through pipeline; 2) toluene waste gas through filter enters cooler; 3) toluene waste gas of discharging cooler enters the adsorbent equipment that active carbon is housed through air-introduced machine; 4) purified gas after adsorption device adsorbs directly enters air; 5) when the charcoal absorption toluene in adsorbent equipment is to time saturated, the toluene waste gas switching entering adsorbent equipment enters other absorption plant, closes the intake valve of the saturated adsorbent equipment of former absorption, air outlet valve and exhaust-valve simultaneously; 6) desorption manipulation is carried out to the saturated adsorbent equipment of absorption: the water vapour valve namely opening adsorbent equipment is warming up to 110 ~ 115 DEG C by it; 7) enter cooler through the toluene of desorption, hot water and water vapour and be cooled to normal temperature; 8) after cooled mixing material enters AUTOMATIC ZONING device AUTOMATIC ZONING, upper toluene flows into toluene intermediate storage tank by upper outlet, lower floor's clear water discharge; 9) toluene of intermediate storage tank is pumped to methylbenzene raw material groove, for use.What during concrete enforcement, each coating machine 1 in workshop came out contains toluene waste gas by exhaust blower 2 through control device 3, gas A not containing toluene directly discharges, filter 4 and cooler 5 is entered through arm containing toluene waste gas, go out the EGT of cooler 5 at about 25 DEG C, this kind is pumped to enter by centrifugal high pressure fan 6 containing toluene waste gas and is equipped with in the adsorption tanks 7 of active carbon.Toluene waste gas when by active carbon layer, toluene by have high-specific surface area, high Selective adsorption active carbon adsorb, and then be attached in active carbon gap, the gas of discharging adsorption tanks 7 is purified gas B, directly can enter air by exhaust chimney.Adsorption tanks 7 adsorb certain hour (general setting 120 minutes can regulate according to the degree of depth height of toluene in waste gas), and after charcoal absorption toluene is extremely saturated, waste gas enters other adsorption tanks through robot control system(RCS) automatic switchover and continues absorption.Close absorption saturated tank exhaust gas inlet valve, outlet valve and exhaust-valve.Open desorption and regeneration system related valve, carry out the desorption manipulation of saturated tank, i.e. open water steam valve 8, be allowed to warm to 110 ~ 115 DEG C, keep certain hour (general setting desorption time be 115 minutes), the toluene got off by desorption from activated carbon surface and hot water and fraction steam enter after cooler 9 is cooled to 25 DEG C, after mixing material enters AUTOMATIC ZONING device 10 AUTOMATIC ZONING, upper toluene flows into the automatic periodic exhaustion of toluene intermediate storage tank 11, lower floor clear water C by upper outlet.The toluene of intermediate storage tank 11 is pumped to the large storage tank 13 of methylbenzene raw material by gear pump 12 and is reused.Adsorption/desorption hockets, and so moves in circles, and ensure that the continuous recovery of toluene.The method reclaims toluene waste gas according to its distinctive physics, chemical substance, the method for its environmental pollution of integrated treatment, and its rate of recovery is higher than 65%.The more important thing is the environment having purified workshop, the toluene level < 40mg/m of the purified gas after purification
3, reach GB GB16297-1996 " atmosphere pollutants emission standards " secondary standard, benzene < 17mg/m
3, toluene < 60mg/m
3.Equipment recycling and administration efficiency reaches more than 97%.System recoveries cost is lower, and the recovery totle drilling cost of toluene per ton is about 800 yuan, is only 1/4th of market price, therefore has good economic benefit.The automation technolo degree of system is high, simple to operate, basic prosthetic expense, if arrange abnormal protection warning device, then the operation of system is reliably fool proof.
CN200610051688 discloses a kind of method reclaiming toluene.Technical measures specifically comprises the following steps: 1, produce in the waste gas that produces be introduced into pneumatic filter through by-pass valve control, the filter be made up of non-woven fabrics is magazins' layout such as the fiber in waste gas, dust out.2, again through subcooler, cooler is made up of copper pipe string aluminium flake, has the cooling water of reusable edible to cool the waste gas comprising toluene gas in cooler.3, through cooled waste gas, enter three adsorption tanks through high pressure positive blower pressurization respectively by airduct of supplying gas, adsorption tank is filled with active carbon, active carbon is filled with space due to inside, the effect of active carbon is the toluene that can adsorb in waste gas, can absorb toluene gas in a large number.Remaining waste gas is from tube emptying.4, because of the increase along with the toluene of charcoal absorption, in the gas of discharge, the content of toluene also can increase, and therefore, after a period of time (such as two hours) is carried out in absorption, adsorption process will be switched to desorption program.During desorption, the valve of original waste gas turnover is closed, and steam valve is opened, and steam enters active carbon packed layer, and active carbon temperature increases, and toluene has departed from active carbon, along with the bottom of water vapour from adsorption tank is discharged.Active carbon after desorption can reenter absorption process again.The toluene gas of the high concentration 5, freed enters condenser along with water vapour, and the cooling water of condenser derives from glass fibre reinforced plastics cooling tower, and condenser is made up of upper and lower two tubular heat exchangers, and tube side is toluene and water vapour passage, and shell side is cooling-water duct.Through cooling water temperature, become the mixed liquor of toluene and water.6, mixed liquor flows into separator by body, and separator is a cuboid container, inside has a dividing plate to be divided into two in container.Mixed liquor enters in separator, the ratio of water is great to be sunk to bottom and is flow to the opposite side of dividing plate by the gap under dividing plate, toluene is lighter than water, float over the top of water, stay original side, the outlet of water and toluene outlet are designed to certain difference in height, just can ensure that toluene just flows out accumulate certain height in separator after.7, toluene flows into storage tank, can be used as raw materials for production and recycles.Its advantage is that employing three adsorption tanks switch in turn, such as, can be absorption after 2 hours adsorption tank debugging, then desorption 1 hour, and three adsorption tanks are per hour once to be switched.Like this, the duty that the absorption of adsorption tank and desorption held stationary continue is made.Utilize toluene different from the proportion of water and the separator designed, simply effectively, toluene and water can be continuously separated.When the mixed liquor of toluene and water enters separator, the ratio of water is great, and sink to bottom, toluene proportion is little, and on the top of water, water enters another cavity through separator internal partition bottom, and the overfall through water is discharged, and toluene liquid then imports storage tank from another overfall.By the automaton that industrial Programmable Logic Controller and the touch-screen of designed, designed form, man-machine interface is good, it is convenient to control, and is equipped with the automaticity that the on-the-spot instrumentation such as temperature, pressure, flow and air control unit make whole device reach certain.
Bentonite is large at China's reserves, application widely, its specific area is large, heat endurance is high, absorption property is good, is a kind of environmental-protection adsorption agent of potential high efficiency low cost, but bentonite also exist swellability comparatively large, be difficult to the shortcomings such as sedimentation, for solving the problem of practical application, prepare that a kind of adsorption effect is higher, settling property good and cheap Bentonite Clean Water Reagent becomes the focus of research.In prior art, acrylamide and bentonitic compound are almost all developed as a kind of high water absorption composite material, and the preparation method of this composite mainly contains solution polymerization process, via Inverse-Phase Suspension Polymerization, radiation polymerization.1. solution polymerization process refers to the polymerization (Ji Hong gradually etc. in " in the research containing bentonitic Crosslinked Super Absorptive Polyacrylamide ") reaction monomers and initator etc. being dissolved in and carrying out in suitable solvent.The low conversion rate of this preparation method's monomer, polymerization speed is slow; The dry difficulty of product; Easily form block gel in reactor and be difficult to process; 2. via Inverse-Phase Suspension Polymerization take organic solvent as decentralized medium, and water-soluble monomer, under suspending agent and strong agitation effect, is dispersed into suspension aqueous phase droplets, and initator is dissolved in the polymerization carried out in aqueous phase droplets.(at " synthesis and characteries of Sodium Polyacrylate/montmorillonite composite high-water-absorptivresin resin ", CN1769191 is used for bentonite base composite material of water treatment and preparation method thereof to Zhang little Hong etc.).Its disadvantage is complex technical process, and the post processing of product is more difficult, must remove the solvent of low molecule reactant and entrained with in product, will reclaim a large amount of decentralized media simultaneously.3. radiation-initiated polymerization method is the method (Li Hong etc. are at " super water-absorbent polyacrylamide/montmorillonite composite material mechanical property Quality Research ") using gamma-radiation or the copolyreaction of ultraviolet light irradiation initiation grafting.But because ray radiant energy is high, for the poor selectivity of chemical reaction, easily there is side reaction, thus limit the range of application of the method.
Summary of the invention
The object of the invention is to propose a kind of method that pressure swing adsorption method reclaims toluene in tail gas.
For reaching this object, the present invention by the following technical solutions:
(1) wrap steam-laden benzene tail gas first to enter in dehumidifier and remove water vapour, pass into the first pressure-swing absorber, adsorption tower internal fixtion has adsorbent, adsorption conditions is 60-80 DEG C, 0.14 ~ 0.18MPa, enter the second pressure-swing absorber subsequently, adsorption tower internal fixtion has adsorbent, adsorption conditions is 80-90 DEG C, 0.11 ~ 0.13MPa, (2) after toluene absorption completely, first and second pressure-swing absorbers are carried out transformation desorption, the vapours of 100-120 DEG C is adopted to carry out transformation desorption, adsorbent in adsorption tower is bentone adsorbent, its preparation method is as follows: prepare absorbent charcoal based bentonite, add water bentonite and active carbon mix and blend, standing sedimentation, solid will be obtained dry at 180 DEG C after Separation of Solid and Liquid, then pulverize, absorbent charcoal based bentonite is obtained through screening, then solution polymerization is carried out, absorbent charcoal based bentonite and mixed with methacrylate monomers are dissolved in distilled water, stir, add initator azodiisobutyronitrile and crosslinking agent formalin, continue to stir, the solid phase obtained is at 60 ~ 80 DEG C of insulation 1-24 hour, after vacuum drying, screening, obtain bentone adsorbent, wherein polymethacrylates accounts for overall 10-20wt%, and absorbent charcoal based bentonite accounts for overall 80-90wt%.
Owing to have employed specific compound adsorbent, to have benzene adsorption rate high for reclaiming benzene for the method, and the gas of discharge is up to state standards completely, improves the economic and social benefit of enterprise.
Detailed description of the invention
Embodiment 1
Wrap steam-laden benzene tail gas first to enter in dehumidifier and remove water vapour, pass into the first pressure-swing absorber, adsorption tower internal fixtion has adsorbent, adsorption conditions is 60-80 DEG C, 0.14 ~ 0.18MPa, enter the second pressure-swing absorber subsequently, adsorption tower internal fixtion has adsorbent, adsorption conditions is 80-90 DEG C, 0.11 ~ 0.13MPa, after toluene absorption completely, first and second pressure-swing absorbers are carried out transformation desorption, the vapours of 100-120 DEG C is adopted to carry out transformation desorption, adsorbent in adsorption tower is bentone adsorbent, its preparation method is as follows: prepare absorbent charcoal based bentonite, add water bentonite and active carbon mix and blend, standing sedimentation, solid will be obtained dry at 180 DEG C after Separation of Solid and Liquid, then pulverize, absorbent charcoal based bentonite is obtained through screening, then solution polymerization is carried out, absorbent charcoal based bentonite and mixed with methacrylate monomers are dissolved in distilled water, stir, add initator azodiisobutyronitrile and crosslinking agent formalin, continue to stir, the solid phase obtained is at 60 ~ 80 DEG C of insulation 1-24 hour, after vacuum drying, screening, obtain bentone adsorbent, wherein polymethacrylates accounts for overall 15wt%, and absorbent charcoal based bentonite accounts for overall 85wt%.
Embodiment 2
Wrap steam-laden benzene tail gas first to enter in dehumidifier and remove water vapour, pass into the first pressure-swing absorber, adsorption tower internal fixtion has adsorbent, adsorption conditions is 60-80 DEG C, 0.14 ~ 0.18MPa, enter the second pressure-swing absorber subsequently, adsorption tower internal fixtion has adsorbent, adsorption conditions is 80-90 DEG C, 0.11 ~ 0.13MPa, after toluene absorption completely, first and second pressure-swing absorbers are carried out transformation desorption, the vapours of 100-120 DEG C is adopted to carry out transformation desorption, adsorbent in adsorption tower is bentone adsorbent, its preparation method is as follows: prepare absorbent charcoal based bentonite, add water bentonite and active carbon mix and blend, standing sedimentation, solid will be obtained dry at 180 DEG C after Separation of Solid and Liquid, then pulverize, absorbent charcoal based bentonite is obtained through screening, then solution polymerization is carried out, absorbent charcoal based bentonite and mixed with methacrylate monomers are dissolved in distilled water, stir, add initator azodiisobutyronitrile and crosslinking agent formalin, continue to stir, the solid phase obtained is at 60 ~ 80 DEG C of insulation 1-24 hour, after vacuum drying, screening, obtain bentone adsorbent, wherein polymethacrylates accounts for overall 10wt%, and absorbent charcoal based bentonite accounts for overall 90wt%.
Embodiment 3
Wrap steam-laden benzene tail gas first to enter in dehumidifier and remove water vapour, pass into the first pressure-swing absorber, adsorption tower internal fixtion has adsorbent, adsorption conditions is 60-80 DEG C, 0.14 ~ 0.18MPa, enter the second pressure-swing absorber subsequently, adsorption tower internal fixtion has adsorbent, adsorption conditions is 80-90 DEG C, 0.11 ~ 0.13MPa, after toluene absorption completely, first and second pressure-swing absorbers are carried out transformation desorption, the vapours of 100-120 DEG C is adopted to carry out transformation desorption, adsorbent in adsorption tower is bentone adsorbent, its preparation method is as follows: prepare absorbent charcoal based bentonite, add water bentonite and active carbon mix and blend, standing sedimentation, solid will be obtained dry at 180 DEG C after Separation of Solid and Liquid, then pulverize, absorbent charcoal based bentonite is obtained through screening, then solution polymerization is carried out, absorbent charcoal based bentonite and mixed with methacrylate monomers are dissolved in distilled water, stir, add initator azodiisobutyronitrile and crosslinking agent formalin, continue to stir, the solid phase obtained is at 60 ~ 80 DEG C of insulation 1-24 hour, after vacuum drying, screening, obtain bentone adsorbent, wherein polymethacrylates accounts for overall 20wt%, and absorbent charcoal based bentonite accounts for overall 80wt%.
Claims (1)
1. a pressure swing adsorption method reclaims the method for toluene in tail gas, it is characterized in that comprising the following steps: (1) is wrapped steam-laden benzene tail gas and first entered in dehumidifier and remove water vapour, pass into the first pressure-swing absorber, adsorption tower internal fixtion has adsorbent, adsorption conditions is 60-80 DEG C, 0.14 ~ 0.18MPa, enter the second pressure-swing absorber subsequently, adsorption tower internal fixtion has adsorbent, adsorption conditions is 80-90 DEG C, 0.11 ~ 0.13MPa, (2) after toluene absorption completely, first and second pressure-swing absorbers are carried out transformation desorption, the vapours of 100-120 DEG C is adopted to carry out transformation desorption, it is characterized in that, adsorbent in adsorption tower is bentone adsorbent, its preparation method is as follows: prepare absorbent charcoal based bentonite, add water bentonite and active carbon mix and blend, standing sedimentation, solid will be obtained dry at 180 DEG C after Separation of Solid and Liquid, then pulverize, absorbent charcoal based bentonite is obtained through screening, then solution polymerization is carried out, absorbent charcoal based bentonite and mixed with methacrylate monomers are dissolved in distilled water, stir, add initator azodiisobutyronitrile and crosslinking agent formalin, continue to stir, the solid phase obtained is at 60 ~ 80 DEG C of insulation 1-24 hour, after vacuum drying, screening, obtain bentone adsorbent, wherein polymethacrylates accounts for overall 10-20wt%, and absorbent charcoal based bentonite accounts for overall 80-90wt%.
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Citations (7)
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|---|---|---|---|---|
| CN1041601A (en) * | 1989-03-01 | 1990-04-25 | 荣庸 | High-absorbent material synthetic method |
| US5298473A (en) * | 1990-07-16 | 1994-03-29 | Board Of Trustees Operating Michigan State University | Hydrated lime clay composites for the removal of SOx from flue gas streams |
| CN1621422A (en) * | 2003-11-30 | 2005-06-01 | 魏军 | Production process of water-absorbent materials |
| CN101077850A (en) * | 2006-05-25 | 2007-11-28 | 林文默 | Method for recovering toluene |
| CN101564676A (en) * | 2009-04-03 | 2009-10-28 | 河北工业大学 | Compound bentonite for removing fluorine from water and preparation method thereof |
| CN104353436A (en) * | 2014-11-05 | 2015-02-18 | 朱忠良 | Method for preparing modified bentonite for removing sulfide in fume |
| CN104353324A (en) * | 2014-11-05 | 2015-02-18 | 朱忠良 | Recycling treatment method for methylbenzene-containing exhaust gas |
-
2015
- 2015-11-13 CN CN201510781652.8A patent/CN105214444A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041601A (en) * | 1989-03-01 | 1990-04-25 | 荣庸 | High-absorbent material synthetic method |
| US5298473A (en) * | 1990-07-16 | 1994-03-29 | Board Of Trustees Operating Michigan State University | Hydrated lime clay composites for the removal of SOx from flue gas streams |
| CN1621422A (en) * | 2003-11-30 | 2005-06-01 | 魏军 | Production process of water-absorbent materials |
| CN101077850A (en) * | 2006-05-25 | 2007-11-28 | 林文默 | Method for recovering toluene |
| CN101564676A (en) * | 2009-04-03 | 2009-10-28 | 河北工业大学 | Compound bentonite for removing fluorine from water and preparation method thereof |
| CN104353436A (en) * | 2014-11-05 | 2015-02-18 | 朱忠良 | Method for preparing modified bentonite for removing sulfide in fume |
| CN104353324A (en) * | 2014-11-05 | 2015-02-18 | 朱忠良 | Recycling treatment method for methylbenzene-containing exhaust gas |
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Application publication date: 20160106 |