CN102266701B - Method for processing waste gas in acrylamide production by chemical method - Google Patents
Method for processing waste gas in acrylamide production by chemical method Download PDFInfo
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- CN102266701B CN102266701B CN 201110070853 CN201110070853A CN102266701B CN 102266701 B CN102266701 B CN 102266701B CN 201110070853 CN201110070853 CN 201110070853 CN 201110070853 A CN201110070853 A CN 201110070853A CN 102266701 B CN102266701 B CN 102266701B
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Abstract
The invention relates to a method for processing waste gas in acrylamide production by a chemical method. In the method, a waste gas is fed into a waste gas precooler to cool the waste gas to be 10-30 DEG C.; the cooled waste gas is fed into a waste gas adsorber which is formed by serial connection of three adsorbers; a medium filled in the adsorber is powdery active carbon, granular active carbon or fibrous active carbon; two of the three adsorbers simultaneously work online in a serial connection manner; the adsorbed waste gas is discharged into atmosphere directly; and the other adsorber resolves the acrylamide adsorbed on the adsorbing medium by using saturated steam; after being cooled by a recovered acrylamide cooler, the resolved acrylamide and the steam are recycled; the three adsorbers perform adsorption resolving operations in turn and switch automatically. The waste gas processed by the method can reach the environmental protection emission standard, and post-treatments such as burning or oxidation and the like are not needed; investment and process consumption are reduced; a greatest amount of acrylamide is recovered; and aims of saving energy and reducing emission are fulfilled.
Description
Technical field
The present invention relates to the processing method of waste gas in a kind of chemical method acrylamide production.
Background technology
At present, in chemical method acrylamide production process, carry out again oxidation processes or burning disposal after the exhaust-gas treatment produced is usually adopted directly burning or absorbs the acrylonitrile reclaimed wherein, meet the requirement of environmental protection with the discharge that guarantees waste gas in the acrylamide production process.Because the exhausted air quantity produced in chemical method acrylamide production process is very large, the exhausted air quantity that one ton of acrylamide of common every production produces is 1500Nm
3, burning or the needed fuel of oxidation are a lot, and wherein contain many acrylonitrile, have caused the waste of fuel and acrylonitrile.
Summary of the invention
The processing method that the purpose of this invention is to provide waste gas in a kind of chemical method acrylamide production, when can make the discharge of waste gas meet environmental requirement, the recovery of maximum acrylonitrile wherein, and the consumed energy of minimum, overcome now methodical energy consumption large, the deficiency that loss in acrylonitrile is many.
The processing method of waste gas in a kind of chemical method acrylamide production, the equipment used comprises waste gas precooler, blower fan, waste gas absorber, recover acrylonitrile cooler, it is characterized in that: at first the waste gas discharged in the production of chemical method acrylamide enter in the waste gas precooler, the temperature of waste gas is cooled between 10～30 ℃ to best 18～20 ℃; Then cooling waste gas is sent in the waste gas absorber by blower fan, the waste gas absorber is comprised of three absorber series windings, the medium of filling in absorber is powdered activated carbon, granular active carbon, fibrous activated carbon, in three absorbers, there are two absorbers to connect and work online simultaneously, waste gas through adsorption treatment directly enters atmosphere, the acrylonitrile that the another one absorber utilizes saturated vapor will be adsorbed on adsorbing medium resolves, and the acrylonitrile of resolving and steam are recycled after the recover acrylonitrile cooler is cooling; Three absorbers are adsorbed successively parse operation and are automatically switched; The size of absorber is determined according to the amount that contains acrylonitrile in the flow of waste gas and waste gas, according to the content requirement index of acrylonitrile in waste gas after absorption, determined the switching time of absorber, the parsing time of absorber was determined according to the adsorption operations time of absorber.
This method is selected has the sticky based activated carbon fiber in the fibrous activated carbon of good absorption property to organic steam, the specific area of this activated carbon fiber can be up to 2600m/g, pore-size distribution is narrow, and micropore volume can reach 1.23/g, is particularly suitable for the processing of large flow waste gas.
The present invention is owing to taking above technical scheme, and it has following characteristics:
1, at first the present invention has carried out pre-cooled processing to waste gas, has guaranteed that acrylonitrile is fully adsorbed in absorber at waste gas.
2, the waste gas absorber that the present invention uses has 3 absorbers, wherein 2 absorber series connection absorption, 1 absorber is resolved, they can automatically switch, process continuously, can reach absorber to the inhaling fully and the parsing fully of absorber of waste gas, guarantee that waste gas is qualified and do not burned or oxidation processes after the waste gas absorber adsorbs.
3, the present invention does not need waste gas is burned or oxidative work-up, and not only method is simple, and has saved a large amount of energy, has reduced the loss of acrylonitrile.
The accompanying drawing explanation
Fig. 1 is the process schematic diagram that the present invention processes waste gas.
In figure, 1-waste gas absorber A, 2-waste gas absorber B, 3-waste gas absorber C, 4-waste gas precooler, 5-one-level blower fan, 6-secondary blower fan, 7-recover acrylonitrile cooler.
The specific embodiment
The waste gas treatment process of the chemical method acrylamide device that has a daily output of 150 tons of acrylamides of take is example, and the present invention is described in further detail.
Consult Fig. 1.Waste gas absorber A1, waste gas absorber B2, waste gas absorber C3, waste gas precooler 4, one-level blower fan 5, secondary blower fan 6, recover acrylonitrile cooler 7.
The waste gas precooler adopts finned heat exchanger, and heat exchange area is 260m
2, adopt the cooling water of 18 ℃ to carry out cooling; One-level blower fan and secondary blower fan all adopt centrifugal blower, and disposal ability is 12000m
3/ h; It is 9m that three absorbers of waste gas absorber are of a size of length, and diameter is 2.5m, and adsorbing medium adopts sticky based activated carbon fiber; The recover acrylonitrile cooler adopts shell-and-tube heat exchanger, and heat exchange area is 30m
2, adopt the cooling water of 18 ℃; The steam used is low-pressure steam, and pressure is 1.0MPa.
Detailed process of the present invention, the exhaust gas flow that production process is discharged is 11000Nm
3/ h, in waste gas, the content of acrylonitrile is 4000～6000 μ g/ml.At first waste gas pass through waste gas precooler 4, be cooled to after 18 ℃ and be sent to waste gas absorber A1 absorption acrylonitrile wherein by one-level blower fan 5, waste gas after absorber A1 absorption is sent in waste gas absorber B2 and continues the wherein acrylonitrile of remnants of absorption by secondary blower fan 6, in waste gas after absorber B2 absorption, the content of acrylonitrile, below 5 μ g/ml, can directly be drained into such waste gas in atmosphere.At absorber A1 and absorber B2 during in the waste gas adsorbed state, absorber C3 is in resolving the acrylonitrile state adsorbed on its sticky based activated carbon fiber with low-pressure steam, the acrylonitrile of resolving and steam are fed to recover acrylonitrile cooler 7, and the acrylonitrile of recovery is stored in storage tank and is recycled after being cooled to 20 ℃.According to the flow of waste gas, the content of acrylonitrile in waste gas, toxic emission index, and the ability of the adsorbs propylene nitrile of waste gas absorber, the adsorption operations time of two waste gas absorbing units is 60min altogether, the parse operation time of waste gas absorbing unit is 10min.After absorber A1 adsorption time reaches 30min, absorber A1 is switched to parse state, resolve complete absorber C3 and switch to adsorbed state, after absorber B2 adsorption time reaches 30min, absorber B2 switches to parse state, absorber A1 replaces the position of absorber B2 to carry out adsorption operations, and three absorbing units adsorb and the parse operation switching successively, and the absorbing unit of absorber carries out handover operation automatically according to programming.
Claims (1)
- A chemical method acrylamide produce in the processing method of waste gas, the equipment used comprises waste gas precooler, blower fan, waste gas absorber, recover acrylonitrile cooler, it is characterized in that: waste gas precooler (4) adopts finned heat exchanger, and heat exchange area is 260m 2, adopt the cooling water of 18 ℃ to carry out cooling; One-level blower fan (5) and secondary blower fan (6) all adopt centrifugal blower, and disposal ability is 12000m 3/ h; Waste gas absorber A(1), waste gas absorber B(2), waste gas absorber C(3) be of a size of length and be 9m, diameter is 2.5m, adsorbing medium adopts sticky based activated carbon fiber; The recover acrylonitrile cooler adopts shell-and-tube heat exchanger, and heat exchange area is 30m 2, adopt the cooling water of 18 ℃; The steam used is low-pressure steam, and pressure is 1.0MPa;The detailed process of processing method is: the exhaust gas flow that production process is discharged is 11000Nm 3/ h, in waste gas, the content of acrylonitrile is 4000～6000 μ g/ml, at first waste gas pass through waste gas precooler (4), be cooled to after 18 ℃ and be sent to waste gas absorber A(1 by one-level blower fan (5)) absorption acrylonitrile wherein, through waste gas absorber A(1) waste gas after absorption is sent to waste gas absorber B(2 by secondary blower fan (6)) in continue wherein remaining acrylonitrile of absorption, through waste gas absorber B(2) content of acrylonitrile, will be through waste gas absorber B(2 below 5 μ g/ml in waste gas after absorption) waste gas after adsorbing directly is drained in atmosphere, at waste gas absorber A(1) and waste gas absorber B(2) when the waste gas adsorbed state, waste gas absorber C(3) in resolve the state of the acrylonitrile adsorbed on sticky based activated carbon fiber with low-pressure steam, the acrylonitrile of resolving and steam are fed to recover acrylonitrile cooler (7), and the acrylonitrile of recovery is stored in storage tank and is recycled after being cooled to 20 ℃, according to the ability of the adsorbs propylene nitrile of content, toxic emission index and the waste gas absorber of acrylonitrile in the flow of waste gas, waste gas, the adsorption operations time of two waste gas absorbers is 60min altogether, and the parse operation time of waste gas absorber is 10min, as waste gas absorber A(1) after adsorption time reaches 30min, waste gas absorber A(1) be switched to parse state, resolve complete waste gas absorber C(3) switch to adsorbed state, as waste gas absorber B(2) after adsorption time reaches 30min, waste gas absorber B(2) switch to parse state, waste gas absorber A(1) adsorption operations is carried out in position replacement waste gas absorber B(2), three waste gas absorbers adsorb and the parse operation switching successively, in three absorbers, there are two absorbers to connect and work online simultaneously, the waste gas absorber carries out handover operation automatically according to programming.
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| CN 201110070853 CN102266701B (en) | 2011-03-23 | 2011-03-23 | Method for processing waste gas in acrylamide production by chemical method |
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| CN 201110070853 CN102266701B (en) | 2011-03-23 | 2011-03-23 | Method for processing waste gas in acrylamide production by chemical method |
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| CN102266701B true CN102266701B (en) | 2013-11-06 |
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| CN103933828A (en) * | 2014-04-30 | 2014-07-23 | 中国石油化工股份有限公司 | Multi-stage adsorption type oil gas recycling system and recycling process thereof |
| CN107778197B (en) * | 2016-08-29 | 2020-07-10 | 中国石油化工股份有限公司 | Purification method of acrylonitrile |
| RU2634456C1 (en) * | 2017-02-28 | 2017-10-30 | Андрей Владиславович Курочкин | Method of capturing acrylonitrile vapours |
| CN107824002A (en) * | 2017-10-18 | 2018-03-23 | 德宏电子(苏州)有限公司 | Secondary desizing waste gas processing method |
Citations (5)
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| CN1415401A (en) * | 2002-10-31 | 2003-05-07 | 福建科海科技股份有限公司 | Method for recovering exhaust gas of multi-element organic solvent |
| CN2686708Y (en) * | 2004-04-07 | 2005-03-23 | 马建 | Intermittent serial adsorption organic waste gas continuous recovery apparatus |
| US7060236B2 (en) * | 2002-10-21 | 2006-06-13 | Yan Tsoung Y | Process for removing volatile organic compounds |
| CN101259357A (en) * | 2007-12-14 | 2008-09-10 | 华南理工大学 | Method and device for recovering organic solvent from waste gases of printing industry |
| CN201316588Y (en) * | 2008-12-02 | 2009-09-30 | 寿光富康制药有限公司 | Organic waste gas adsorption and recycling device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7060236B2 (en) * | 2002-10-21 | 2006-06-13 | Yan Tsoung Y | Process for removing volatile organic compounds |
| CN1415401A (en) * | 2002-10-31 | 2003-05-07 | 福建科海科技股份有限公司 | Method for recovering exhaust gas of multi-element organic solvent |
| CN2686708Y (en) * | 2004-04-07 | 2005-03-23 | 马建 | Intermittent serial adsorption organic waste gas continuous recovery apparatus |
| CN101259357A (en) * | 2007-12-14 | 2008-09-10 | 华南理工大学 | Method and device for recovering organic solvent from waste gases of printing industry |
| CN201316588Y (en) * | 2008-12-02 | 2009-09-30 | 寿光富康制药有限公司 | Organic waste gas adsorption and recycling device |
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