CN1597051A - Method for recovering toluene from exhausted air - Google Patents
Method for recovering toluene from exhausted air Download PDFInfo
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- CN1597051A CN1597051A CN 03159299 CN03159299A CN1597051A CN 1597051 A CN1597051 A CN 1597051A CN 03159299 CN03159299 CN 03159299 CN 03159299 A CN03159299 A CN 03159299A CN 1597051 A CN1597051 A CN 1597051A
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- toluene
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Abstract
A method for recovering toluene from the exhausted air containing toluene includes such steps as flowing said exhausted air through filter, cooler and draught fan into one of two adsorptive units containing activated carbon for adsorbing the toluene, desorbing, cooling the desorbed toluene, hot water and steam, automatic layering, and recovering the upper toluene layer.
Description
(1) technical field
The present invention relates to the method for a kind of toluene waste gas as raw material taking back and process environmental pollution.
(2) background technology
Toluene is a kind of good organic solvent, and is main with the thinner of gasoline as coating, is widely used in the industries such as rubber, cloth waterproof gluing, adhesive tape, synthetic leather and ink printing.Toluene itself has lower boiling (110.6 ℃ of boiling points), volatile, and cloth is coated with characteristics such as convenient, but the cloth behind the gluing requires glue-line toluene to evaporate as early as possible totally in subsequent handling, reaches glue-line with it and is not clamminess.Toluene is again a kind of certain toxic material that has, and its steam has hormesis to human body skin, mucous membrane, simultaneously central nervous system is had anesthetic action, and long term can influence hepatic and renal function.Therefore, maximum permissible concentration is 40mg/m in the workshop air
3This shows that in view of the physicochemical characteristic of above-mentioned toluene, the waste gas that contains toluene is administered in recovery extremely positive meaning.
(3) summary of the invention
The present invention aims to provide and a kind ofly toluene waste gas in the industrial production is reclaimed the method for comprehensive treating process environmental pollution as raw material.
Processing step of the present invention is:
1) toluene waste gas of being discharged by exhaust blower enters strainer through pipeline;
2) toluene waste gas through filter enters water cooler;
3) toluene waste gas of discharge water cooler enters the adsorption unit that gac is housed through induced draft fan;
4) purified gas after adsorption unit absorption directly enters atmosphere;
5) when the charcoal absorption toluene in the adsorption unit is extremely saturated, the toluene waste gas switching that enters adsorption unit enters other absorption unit, closes intake valve, air outlet valve and the exhaust-valve of the saturated adsorption unit of former absorption simultaneously;
6) carry out desorption manipulation to adsorbing saturated adsorption unit: the water vapor valve of promptly opening adsorption unit is warming up to 110～115 ℃ by it;
7) enter water cooler through toluene, hot water and the water vapor of desorption and be cooled to normal temperature;
8) after the cooled mixed liquor body entered AUTOMATIC ZONING device AUTOMATIC ZONING, upper toluene flowed into the toluene intermediate storage tank by the top outlet, lower floor's clear water discharging;
9) toluene of intermediate storage tank is pumped to the methylbenzene raw material groove, for use.
Said adsorption unit is established 1 at least.
As everyone knows, one of industrial solvent that toluene and benzene are present harmful to human, contaminate environment is the most serious, self is poisonous, and long-term the suction caused serious murder by poisoning to human body.The present invention is directed to the serious problems of existing social being, provide a kind of according to its distinctive physics, chemical substance to toluene waste gas reclaim, the method for its environmental pollution of comprehensive treating process, its rate of recovery is higher than 65%.The more important thing is the environment that has purified production plant, the toluene level＜40mg/m of the purified gas after the purification
3, reach GB GB16297-1996 " atmosphere pollutants emission standards " secondary standard, benzene＜17mg/m
3, toluene＜60mg/m
3Equipment reclaims governance efficiency and reaches more than 97%.The system recoveries cost is lower, and the recovery total cost of toluene per ton is about 800 yuan, only is 1/4th of market price, and therefore good economic benefits is arranged.The automation technolo degree height of system, simple to operate, there is not labour cost usefulness substantially, if the abnormal protection warning device is set, then the operation of system is fool proof reliable.
(4) description of drawings
Fig. 1 is the process flow sheet of the embodiment of the invention.
(5) embodiment
Following examples will the present invention is further illustrated in conjunction with the accompanying drawings.
As shown in Figure 1, each coating machine 1 of workshop comes out contain toluene waste gas by exhaust blower 2 through control device 3, the gas A that does not contain toluene directly discharges, what contain toluene waste gas enters strainer 4 and water cooler 5 through arm, the spent air temperture that goes out water cooler 5 is about 25 ℃, and this kind contains toluene waste gas and pumped by centrifugal high pressure fan 6 and enter in the adsorption tanks 7 that gac is housed.Toluene waste gas is by active carbon layer the time, and toluene is had high-specific surface area, the high gac of adsorptivity of selecting is adsorbed, and then attached in the gac slit, the gas of discharging adsorption tanks 7 is purified gas B, can directly enter atmosphere by gas shaft.Adsorption tanks 7 absorption certain hours (generally set 120 minutes, can just regulate according to the degree of depth of toluene in the waste gas), after charcoal absorption toluene was extremely saturated, waste gas automaticallyed switch through robot control system(RCS) and enters other adsorption tanks continuation absorption.Close absorption saturated jar of exhaust gas inlet valve, outlet valve and exhaust-valve.Open desorption and regeneration system related valve, carry out saturated jar desorption manipulation, promptly open water vapor valve 8, be allowed to warm to 110～115 ℃, keep certain hour (generally setting desorption time is 115 minutes), after toluene that is got off by desorption from activated carbon surface and hot water and small portion steam enter water cooler 9 and is cooled to 25 ℃, after mixing liquid enters AUTOMATIC ZONING device 10 AUTOMATIC ZONING, upper toluene flows into toluene intermediate storage tank 11 by the top outlet, and the clear water C of lower floor is discharging regularly automatically.The toluene of intermediate storage tank 11 is pumped to the big storage tank 13 of methylbenzene raw material by toothed gear pump 12 and is reused.Adsorption/desorption hockets, and so moves in circles, and has guaranteed the continuous recovery of toluene.
Claims (2)
1, toluene waste gas recovery method is characterized in that its processing step is:
1) toluene waste gas of being discharged by exhaust blower enters strainer through pipeline;
2) toluene waste gas through filter enters water cooler;
3) toluene waste gas of discharge water cooler enters the adsorption unit that gac is housed through induced draft fan;
4) purified gas after adsorption unit absorption directly enters atmosphere;
5) when the charcoal absorption toluene in the adsorption unit is extremely saturated, the toluene waste gas switching that enters adsorption unit enters other absorption unit, closes intake valve, air outlet valve and the exhaust-valve of the saturated adsorption unit of former absorption simultaneously;
6) carry out desorption manipulation to adsorbing saturated adsorption unit: the water vapor valve of promptly opening adsorption unit is warming up to 110～115 ℃ by it;
7) enter water cooler through toluene, hot water and the water vapor of desorption and be cooled to normal temperature;
8) after the cooled mixed liquor body entered AUTOMATIC ZONING device AUTOMATIC ZONING, upper toluene flowed into the toluene intermediate storage tank by the top outlet, lower floor's clear water discharging;
9) toluene of intermediate storage tank is pumped to the methylbenzene raw material groove.
2, toluene waste gas recovery method as claimed in claim 1 is characterized in that said adsorption unit establishes 1 at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03159299 CN1597051A (en) | 2003-09-15 | 2003-09-15 | Method for recovering toluene from exhausted air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03159299 CN1597051A (en) | 2003-09-15 | 2003-09-15 | Method for recovering toluene from exhausted air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1597051A true CN1597051A (en) | 2005-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03159299 Pending CN1597051A (en) | 2003-09-15 | 2003-09-15 | Method for recovering toluene from exhausted air |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559315A (en) * | 2009-04-29 | 2009-10-21 | 石狮市亿祥染整有限公司 | Methylbenzene recycling system |
| CN104759254A (en) * | 2015-04-15 | 2015-07-08 | 南通职业大学 | Preparation method of chromium-loaded active carbon as well as condition and device of methylbenzene adsorption using chromium-loaded active carbon |
| CN106413850A (en) * | 2016-01-11 | 2017-02-15 | 鹤山市新科达企业有限公司 | Device and method for adsorbing and recovery processing waste gas from synthetic leather factories by activated carbon |
| CN108083965A (en) * | 2017-12-06 | 2018-05-29 | 启东久星化工有限公司 | A kind of recycling technique of toluene |
| CN108217799A (en) * | 2018-01-24 | 2018-06-29 | 江苏新聚环保技术有限公司 | A kind of Toluene Wastewater hot blow desorption adsorption device |
-
2003
- 2003-09-15 CN CN 03159299 patent/CN1597051A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559315A (en) * | 2009-04-29 | 2009-10-21 | 石狮市亿祥染整有限公司 | Methylbenzene recycling system |
| CN104759254A (en) * | 2015-04-15 | 2015-07-08 | 南通职业大学 | Preparation method of chromium-loaded active carbon as well as condition and device of methylbenzene adsorption using chromium-loaded active carbon |
| CN104759254B (en) * | 2015-04-15 | 2017-05-10 | 南通职业大学 | Preparation method of chromium-loaded active carbon as well as condition and device of methylbenzene adsorption using chromium-loaded active carbon |
| CN106413850A (en) * | 2016-01-11 | 2017-02-15 | 鹤山市新科达企业有限公司 | Device and method for adsorbing and recovery processing waste gas from synthetic leather factories by activated carbon |
| WO2017120719A1 (en) * | 2016-01-11 | 2017-07-20 | 鹤山市新科达企业有限公司 | Apparatus and method for activated carbon absorption recovery and treatment of synthetic leather plant waste gas |
| CN108083965A (en) * | 2017-12-06 | 2018-05-29 | 启东久星化工有限公司 | A kind of recycling technique of toluene |
| CN108217799A (en) * | 2018-01-24 | 2018-06-29 | 江苏新聚环保技术有限公司 | A kind of Toluene Wastewater hot blow desorption adsorption device |
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