CN101703869B - New method and device for recovering organic solvent from waste gas - Google Patents
New method and device for recovering organic solvent from waste gas Download PDFInfo
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- CN101703869B CN101703869B CN2009102097797A CN200910209779A CN101703869B CN 101703869 B CN101703869 B CN 101703869B CN 2009102097797 A CN2009102097797 A CN 2009102097797A CN 200910209779 A CN200910209779 A CN 200910209779A CN 101703869 B CN101703869 B CN 101703869B
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Abstract
The invention discloses a method for recovering organic solvent from waste gas. The method is mainly characterized by integrating the advantages of a conventional absorption method and a conventional adsorption method. The method comprises the following steps of: absorbing the organic solvent by spraying; then adsorbing the organic solvent by using a molecular sieve; and obtaining the organic solvent after heating the regenerated molecular sieve, wherein absorbent can be recycled. A device provided according to the method comprises an absorption tower, an adsorption pot and a heating regeneration mechanism. Waste gas enters the absorption tower from the lower part, becomes clean gas through spraying and then is exhausted from the top of the absorption tower, wherein the absorbent is used as a spraying liquid; the molecular sieve is arranged in the adsorption pot so as to ensure that the organic solvent is adsorbed by the molecular sieve after the absorbent containing the organic solvent flows through the adsorption pot, and the absorbent renewedly enters the absorption tower to carry out spraying operation; and then the organic solvent is obtained through heating the molecular sieve adsorbing the organic solvent by the heating regeneration mechanism. The method and the device can save a great amount of energy resources and solve the problems of lots of energy resources consumed by absorbing the organic solvent by the absorption method and difficult regeneration after adsorbing by the adsorption method at present.
Description
Technical field
The present invention relates to the waste gas recovery and treatment method, be specially a kind of method and device thereof that from waste gas, reclaims organic solvent.
Background technology
Common waste gas processing method is two kinds, and a kind of for utilizing the organic solvent in the sorbing material absorption waste gas, another kind of for utilizing the organic solvent in the absorption process absorbing waste gas, waste gas is discharged through becoming clean gas after these two kinds of methods.
For the organic solvent that utilizes in the sorbing material absorption waste gas; The problem that we face is that sorbing material can discharge great amount of heat in the process of absorption, therefore, and when the organic solvent concentration in the waste gas reaches certain ratio; The danger that the adsorbent bed temperature sharply raises can appear; So that the adsorption capacity of sorbing material descended significantly even lose adsorption capacity, in addition, utilize absorption method directly from waste gas, to adsorb organic solvent; Because it is big to handle gas flow, adsorbent bed is difficult to make and operation under vacuum state.
Utilize traditional absorption process; The supporting use of absorption tower and desorber need be set, after absorbent absorbs certain amount of organic solvent, need that absorbent is sent into desorber and carry out desorb; Traditional desorption mode is a heat treatment process; Contain the enough low clean gas of organic solvent for guaranteeing that waste gas becomes after treatment, the concentration of the organic solvent of the absorbent in the absorbing waste gas behind the organic solvent is generally all lower, and the concentration ratio of organic solvent of absorbent that promptly is sent to desorber is lower; Therefore, need the higher energy of consumption rate could reclaim certain amount of organic solvent.Such as; Utilize water to absorb and handle when containing the waste gas of DMAC, the concentration that absorbs organic solvent in the water of back is generally about 10%, because the boiling point of DMAC is about 160 ℃; For water is separated with DMAC; Must be with a large amount of water evaporations, the theoretical energy consumption that 1 kilogram of purity of every acquisition need consume than higher DMAC is not less than 8600 kilocalories, promptly whenever obtains 1 ton of DMAC and need consume 12 tons of steam.For another example; Overseas utilization DOP or similarly plasticizer handle when containing the organic exhaust gas of toluene as absorbent; Toluene level just must be regenerated absorbent near 1% o'clock in the absorbent, in regenerator, for toluene is separated with absorbent, must the mixture of absorbent and toluene be heated to about 110 ℃; Per minute is not less than 6050 kilocalories from the energy consumption that 1 kilogram of toluene needs, and promptly whenever obtains 1 ton of toluene and need consume 10 tons of steam.
Summary of the invention
The objective of the invention is to combine the advantage of conventional absorption process and conventional absorption method, propose a kind of new method and the device thereof that from waste gas, reclaim organic solvent.
The present invention reclaims the new method of organic solvent from waste gas technical scheme is achieved in that
Comprise the steps:
1) utilize absorbent to spray the organic solvent in the mode absorbing waste gas down;
2) utilize molecular sieve to select the organic solvent in the property absorption absorbent;
3) the thermal regeneration molecular sieve is to reclaim organic solvent.
When organic solvent was methyl alcohol, absorbent was an ethylene glycol phenyl ether, and molecular sieve is the ZSM5 type molecular sieve of high silicon.
When organic solvent was DMAC, absorbent was a water, and molecular sieve is the BETA type molecular sieve of high silicon.
When organic solvent was butanone, absorbent was a water, and molecular sieve is the ZSM5 type molecular sieve of high silicon.
When organic solvent is toluene; Absorbent is high boiling organic solvents such as N-methyl pyrrolidone, fatty acid methyl ester, white oil, ethylene glycol phenyl ether acetate or other plasticizer, the molecular diameter of the organic solvent that the diameter of molecular sieve separates greater than needs and less than the molecular diameter of high boiling organic solvent.
The present invention is achieved in that about the technical scheme that from waste gas, reclaims the device of organic solvent
Comprise absorption tower, adsorption tanks, thermal regeneration mechanism, wherein:
Shower nozzle spray thrower down is set in the absorption tower, and waste gas gets into the absorption tower and discharges from the top, absorption tower through becoming clean gas after spraying from the bottom, and spray liquid is an absorbent:
The built-in molecular sieve of adsorption tanks, adsorption tanks are through pipeline, and outlet links to each other with spray thrower; Import links to each other with absorption tower lower bank fluid; Make the absorbent stream that contains organic solvent through adsorption tanks, organic solvent by molecular sieve adsorption after, absorbent gets into the operation of absorption tower spray once more;
Thermal regeneration mechanism is adsorbed with the molecular sieve of organic solvent through heating, thereby obtains organic solvent, and molecular sieve is capable of circulation to be utilized again.
Two-layer spray thrower is set in the absorption tower, is spray thrower A, spray thrower B, wherein; Spray thrower A is on the top of spray thrower B; Adsorption tanks are through pipeline, and outlet links to each other with spray thrower A, and the absorption tower links to each other with a looped pipeline through valve body; The import of said looped pipeline and adsorption tanks import link to each other with absorption tower lower bank fluid through water pump, cooler; The outlet of looped pipeline links to each other with spray thrower B, and the absorbent that looped pipeline flows into spray thrower B is the absorbent of semi-saturation state, thereby reaches the purpose of waste gas being carried out the secondary absorption cleaning.
Adsorption tanks are two or more parallel connections.
The present invention combines the advantage of conventional absorption process and conventional absorption method; Utilize spray that organic solvent is absorbed earlier; Utilize molecular sieve that organic solvent is adsorbed then, the absorbent reusable edible can obtain organic solvent behind the thermal regeneration molecular sieve; The method can be saved a large amount of energy resource consumptions, can improve utilize absorption process to absorb the mass energy consumption that organic solvent expends at present and utilize absorption method absorption after the difficult problem of regeneration.
Below in conjunction with accompanying drawing the present invention is further described.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention.
The specific embodiment
The present invention is method and the device thereof that from waste gas, reclaims organic solvent, and method comprises the steps:
1) utilize absorbent to spray the organic solvent in the mode absorbing waste gas down;
2) utilize molecular sieve to select the organic solvent in the property absorption absorbent;
3) the thermal regeneration molecular sieve is to reclaim organic solvent.
Embodiment one:
From the waste gas that contains DMAC, reclaim DMAC:
The absorbent of selecting for use when reclaiming DMAC is a water, and molecular sieve is the BETA type molecular sieve of high silicon, and when experiment was illustrated in the water DMAC content 2%, high silicon BETA type molecular sieve can surpass 15% of himself weight to the adsorbance of DMAC.Technical scheme of the present invention institute consumption energy consumption is 1/3 of a tradition absorption-desorption method institute consumption energy consumption; And technical scheme of the present invention; The concentration of DMAC maintains lower level all the time in the water, and the contained after treatment DMAC concentration ratio of waste gas tradition absorption-desorption mode is much lower.Can to take absorbent be water to nearly all water-miscible organic solvent except toluene, and molecular sieve is the similar scheme of the BETA type molecular sieve of high silicon.
Embodiment two:
From the waste gas that contains butanone, reclaim butanone:
The absorbent of selecting for use when reclaiming butanone is a water, and molecular sieve is the ZSM5 type molecular sieve of high silicon, and when experiment was illustrated in the water butanone content 2%, high-silicon ZSM-5 5 type molecular sieves can surpass 10% of himself weight to the adsorbance of butanone.Technical scheme of the present invention institute consumption energy consumption is 1/3 of a tradition absorption-desorption method institute consumption energy consumption.
Embodiment three:
From the waste gas that contains methyl alcohol, reclaim methyl alcohol:
When from the waste gas that contains methyl alcohol, reclaiming methyl alcohol; The absorbent of selecting is an ethylene glycol phenyl ether; And molecular sieve is the ZSM5 type molecular sieve of high silicon, and when experiment was illustrated in the ethylene glycol phenyl ether methanol content 2% left and right sides, high-silicon ZSM-5 5 type molecular sieves can surpass 10% of himself weight to the adsorbance of methyl alcohol.Technical scheme of the present invention institute consumption energy consumption is about 1/5 of a traditional active carbon adsorption treatment method institute consumption energy consumption.
Embodiment four:
From the waste gas that contains toluene, reclaim toluene:
When from the waste gas that contains toluene, reclaiming toluene; The absorbent of selecting can be: high boiling organic solvents such as N-methyl pyrrolidone, fatty acid methyl ester, white oil, ethylene glycol phenyl ether acetate or other plasticizer; The diameter of molecular sieve is at the right molecular sieve of 6 Izods; When experiment was illustrated in the absorbent toluene level 2% left and right sides, molecular sieve can surpass 10% of himself weight to the adsorbance of toluene.Technical scheme of the present invention institute consumption energy consumption be tradition absorb desorption method institute consumption energy consumption about 1/5.
As shown in Figure 1, the device of recovery organic solvent from waste gas: comprise absorption tower 1, adsorption tanks 2, thermal regeneration mechanism 3, wherein:
Shower nozzle spray thrower A, spray thrower B down is set in the absorption tower 1; Wherein, spray thrower A is on the top of spray thrower B, and adsorption tanks 2 pass through pipeline; Outlet links to each other with spray thrower A; Absorption tower 1 also links to each other with a looped pipeline 4 through valve body, and the import of said looped pipeline 4 and adsorption tanks 2 imports link to each other with absorption tower 1 lower bank fluid through water pump 5, cooler 6, and the outlet of looped pipeline 4 links to each other with spray thrower B; The absorbent that looped pipeline 4 flows into spray thrower B is the absorbent of semi-saturation state, and the absorbent that adsorption tanks 2 flow into spray thrower A is the absorbent of cycling and reutilization.
During operation, waste gas gets into absorption tower 1 from the bottom, through spray thrower B one-level spray, discharges at 1 top from the absorption tower through becoming clean gas behind the spray thrower A secondary spray again.
Adsorption tanks 2 built-in molecular sieves, the molecular sieve property selected absorption organic solvent makes the absorbent stream that contains organic solvent behind adsorption tanks 2, and absorbent gets into absorption tower 1 spray operation once more; Adsorption tanks 2 are two or more parallel connections, and are as shown in the figure, adsorption tanks 21,22, two adsorption tanks alternately operatings of adsorption tanks.
Thermal regeneration mechanism 3 is adsorbed with the molecular sieve of organic solvent through heating, thereby obtains organic solvent, and molecular sieve is capable of circulation to be utilized again.
Claims (9)
1. from waste gas, reclaim the method for organic solvent, it is characterized in that comprising the steps: 1) utilize absorbent to spray the organic solvent in the mode absorbing waste gas down; 2) utilize molecular sieve to select the organic solvent in the property absorption absorbent; 3) the thermal regeneration molecular sieve is to reclaim organic solvent.
2. method according to claim 1 is characterized in that: when organic solvent was methyl alcohol, absorbent was an ethylene glycol phenyl ether, and molecular sieve is the ZSM5 type molecular sieve of high silicon.
3. method according to claim 1 is characterized in that: when organic solvent was DMAC, absorbent was a water, and molecular sieve is the BETA type molecular sieve of high silicon.
4. method according to claim 1 is characterized in that: when organic solvent was butanone, absorbent was a water, and molecular sieve is the ZSM5 type molecular sieve of high silicon.
5. from waste gas, reclaim the device of organic solvent, it is characterized in that: comprise absorption tower, adsorption tanks, thermal regeneration mechanism, wherein:
Shower nozzle spray thrower down is set in the absorption tower, and waste gas gets into the absorption tower and discharges from the top, absorption tower through becoming clean gas after spraying from the bottom, and spray liquid is an absorbent:
The built-in molecular sieve of adsorption tanks, adsorption tanks are through pipeline, and outlet links to each other with spray thrower; Import links to each other with absorption tower lower bank fluid; Make the absorbent stream that contains organic solvent through adsorption tanks, organic solvent by molecular sieve adsorption after, absorbent gets into the operation of absorption tower spray once more;
Thermal regeneration mechanism is adsorbed with the molecular sieve of organic solvent through heating, thereby obtains organic solvent, and molecular sieve is capable of circulation to be utilized again.
6. device according to claim 5 is characterized in that: two-layer spray thrower is set in the absorption tower, is respectively spray thrower A, spray thrower B, said spray thrower A is on the top of spray thrower B, and adsorption tanks are through pipeline, and outlet links to each other with spray thrower A; The absorption tower links to each other with a looped pipeline through valve body; The import of said looped pipeline links to each other with absorption tower lower bank fluid; The outlet of looped pipeline links to each other with spray thrower B, and the absorbent that looped pipeline flows into spray thrower B is the absorbent of semi-saturation state, thereby reaches the purpose of waste gas being carried out the secondary absorption cleaning.
7. device according to claim 5 is characterized in that: between outlet of absorption tower lower bank fluid and the adsorption tanks import cooler and water pump are set.
8. device according to claim 6 is characterized in that: between the outlet of absorption tower lower bank fluid and adsorption tanks import and the looped pipeline import cooler and water pump are set.
9. according to the described device of arbitrary claim in the claim 6 to 8, it is characterized in that: adsorption tanks are two or more parallel connections.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102097797A CN101703869B (en) | 2009-10-28 | 2009-10-28 | New method and device for recovering organic solvent from waste gas |
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| CN2009102097797A CN101703869B (en) | 2009-10-28 | 2009-10-28 | New method and device for recovering organic solvent from waste gas |
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| CN101703869A CN101703869A (en) | 2010-05-12 |
| CN101703869B true CN101703869B (en) | 2012-11-21 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102462973A (en) * | 2010-11-05 | 2012-05-23 | 承源環境科技企業有限公司 | Organic solvent purifying device |
| CN102078747A (en) * | 2010-12-27 | 2011-06-01 | 苏州天立蓝环保科技有限公司 | Organic waste gas treating and recycling device and method |
| CN103772113B (en) * | 2012-10-24 | 2016-02-03 | 中国石油化工股份有限公司 | A kind of method of methyl tertiary butyl ether cracking isobutene polymer grade |
| CN104974010B (en) * | 2014-04-01 | 2016-10-26 | 万华化学集团股份有限公司 | The method for refining solvent of a kind of phosgene legal system isocyanates and the device used |
| CN104667646B (en) * | 2015-01-23 | 2017-02-22 | 北京博源恒升高科技有限公司 | Waste gas dust removing method and device |
| CN104961187A (en) * | 2015-06-17 | 2015-10-07 | 马军 | Method for treating wastewater with organic solvents |
| CN110683964A (en) * | 2019-09-27 | 2020-01-14 | 苏州巨联环保有限公司 | DMAC (dimethylacetamide) recycling, purifying and circulating environment-friendly device |
| CN112023674A (en) * | 2020-09-17 | 2020-12-04 | 成都祯鑫科技有限公司 | Super absorbent resin carrier adsorption reaction type air purifying agent |
| CN112675663A (en) * | 2020-11-26 | 2021-04-20 | 浙江工业大学 | Toluene tail gas treatment method |
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