CN101053732A

CN101053732A - Processing method for organic waste gas during the manufacturing artificial leather

Info

Publication number: CN101053732A
Application number: CN 200710026708
Authority: CN
Inventors: 马军
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-02-05
Filing date: 2007-02-05
Publication date: 2007-10-17

Abstract

The invention disclose a method for reclaiming the organic solvent in the organic exhaust gas in the process of making leatheroid, comprising absorbing the organic material such as toluene, butanone and xylene in the exhaust gas after cooling and absorbing concentrating the organic exhaust gas in the process of making leatheroid, using the liquid dimethyl formamide as an absorbent in the absorber, forming the dimethyl formamide solution with organic solvent, and treat it to be the gas draining into the air directly according with the require of environmental protection after passing the absorbing concentrator. The invention has a simply technological process and a convenient operation, which saves the energy sources, reduces the product cost, and also reclaims the organic material such as dimethyl formamide, toluene, butanone and xylene in the exhaust gas, to make the extraction ratio of the organic material in the exhaust gas reach above 90 percent and the gas draining into the air at last according with the require of state standard for environmental protection.

Description

The organic waste gas treatment method that produces in the artificial leather manufacture process

Technical field

The present invention relates to the leatherware production field, specifically is the organic waste gas treatment method that produces in a kind of artificial leather manufacture process.

Background technology

At present, environmental protection and resource regeneration have become the important subject of industrial sustainable development, and at chemical industry such as leatherware leather production field, this problem also seems and is even more important.As everyone knows, artificial leather can produce a large amount of waste gas that contains dimethyl formamide (being called for short DMF), toluene, butanone and dimethylbenzene in production process, if this waste gas is disregarded, directly enters atmosphere, not only pollutes the environment, and can be detrimental to health.Now in industrial processes, generally adopt packed absorber to come the organic exhaust gas that produces in handler's fabricate-leather production process, after the processing of absorption tower, DMF major part in the waste gas is recovered, but still have part DMF to be stored in the waste gas, and harmful substances such as the toluene in the former waste gas, butanone, dimethylbenzene are also substantially all arranged to atmosphere with waste gas, not only do not satisfy the requirement of country, cause the waste of organic substance resources such as toluene, butanone, dimethylbenzene, dimethyl formamide simultaneously waste gas emission standard.

Summary of the invention

The objective of the invention is to problem and shortage at above-mentioned existence, carry the organic waste gas treatment method that produces in a kind of new artificial leather manufacture process of arch, dimethyl formamide in the not only recyclable waste gas of this method, organic substances such as the toluene in the also recyclable waste gas, butanone, dimethylbenzene make the gas that finally enters in the atmosphere satisfy the requirement of the relevant environmental protection standard of country simultaneously.

Technical scheme of the present invention is achieved in that

I) with the organic exhaust gas process cooling processing that produces in the artificial leather manufacture process, after passing through adsorption treatment again, be separated into the gas up to standard that can directly enter atmosphere and contain the gas of toluene, butanone, dimethylbenzene and dimethyl formamide high concentration, dimethyl formamide concentration is enough high, could be in the subsequent technique process during with gas cooled to 0～5 ℃, most of dimethyl formamide in the gas condenses with the form of liquid state, for making dimethyl formamide concentration enough high, organic exhaust gas can pass through one-level or multistage adsorption treatment.

II) contain the gas of toluene, butanone, dimethylbenzene and dimethyl formamide high concentration after supercooling, freezing processing, most of dimethyl formamide is separated with the form of liquid state, and toluene, butanone, dimethylbenzene and a spot of dimethyl formamide are present in the residual gas.

III) utilize the absorption tower, with liquid dimethyl base formamide is absorbent, absorb toluene, butanone, dimethylbenzene in the residual gas, the dimethyl formamide solution that formation contains toluene, butanone, dimethylbenzene is discharged from the bottom, absorption tower and first class purification gas is discharged from top, absorption tower, and first class purification gas contains in a spot of unabsorbed toluene, butanone, dimethylbenzene and the absorption process dimethyl formamide of volatilization again.

IV) first class purification gas passes through adsorption treatment again, is separated into the gas up to standard and the residual gas that can directly enter atmosphere;

V) residual gas repeating step II, III, the IV of step IV discharge carry out circular treatment.

Further technical scheme of the present invention is:

Step I, adopt rotary-type inspissator to carry out adsorption treatment among the step IV, the runner of rotary-type inspissator adopts the molecular sieve manufacturing to form, during the runner operate as normal rotating speed be 1 change～5 change/hour, rotary-type inspissator has been divided into 3 zones, one is treatment region, one is the cooling zone, one is the renewing zone, the organic exhaust gas that produces in the artificial leather manufacture process flows through the back from rotary-type inspissator treatment region and is adsorbed in the gas that runner becomes relative clean because of organic solvent, the content of organic solvent is minimum in the gas after the processing reduces to below the 10ppm, the organic exhaust gas that part flows through from rotary-type inspissator cooling zone, after being heated to certain temperature, form regeneration air, regeneration air flows through through rotary-type inspissator renewing zone again, because rotary-type inspissator renewing zone is reproduced air heat, simultaneously, runner is with the per hour speed rotation of 1 commentaries on classics～5 commentaries on classics, take away with regeneration air when being adsorbed on the rotary-type inspissator of the organic solvent process renewing zone on the runner, formation contains toluene, butanone, the gas of dimethylbenzene and dimethyl formamide high concentration.In absorption inspissator when work,, regeneration air and the ratio of handling air are between 1/10～1/20, and the concentration of organic solvent can be to handle 10～20 times of preceding concentration in the regeneration air.

The present invention is owing to adopted as above technical process, the rate of recovery that makes the organic substance (dimethyl formamide, toluene, butanone, dimethylbenzene) in the waste gas is up to more than 90%, and make the gas that finally enters in the atmosphere satisfy the relevant environmental requirement of country, and reduced production cost, saved the energy.

Description of drawings

Fig. 1 is a kind of process chart of the present invention.

The specific embodiment

As shown in Figure 1, the organic waste gas treatment method of the present invention for producing in the artificial leather manufacture process, its technical process is as follows:

I) organic exhaust gas that produces in the artificial leather manufacture process is through cooling water heat exchanger cooling processing (chilling temperature is 25 ℃～35 ℃), utilizing blower fan that gas is blown into rotary-type inspissator, simultaneously, the runner of rotary-type inspissator changes with 1 and～5 changes/hour the speed rotation, organic exhaust gas is from becoming the gas B of relative clean after rotary-type inspissator treatment region flows through, gas B can directly enter atmosphere, the organic exhaust gas that part flows through from rotary-type inspissator cooling zone, after being heated to certain temperature, form regeneration air, regeneration air flows through through rotary-type inspissator renewing zone again, take away with regeneration air when being adsorbed on the rotary-type inspissator of the organic solvent process renewing zone on the runner, formation contains toluene, butanone, the gas C of dimethylbenzene and dimethyl formamide high concentration.

II) the gas C that contains toluene, butanone, dimethylbenzene and dimethyl formamide high concentration through the cooling water heat exchanger cooling, (chilling temperature is 25 ℃～35 ℃ to chilled water heat exchanger freezing processing, cryogenic temperature is 0 ℃～5 ℃) after, most of dimethyl formamide D separates with the form of liquid state, and toluene, butanone, dimethylbenzene and a spot of dimethyl formamide are present among the residual gas E.

III) utilize the absorption tower, with liquid dimethyl base formamide is absorbent (the liquid dimethyl base formamide that absorbent liquid dimethyl base formamide can directly adopt Step II to discharge, can add in right amount when the liquid dimethyl base formamide that Step II is discharged is not enough) absorb the toluene among the residual gas E, butanone, dimethylbenzene, formation contains toluene, butanone, the dimethyl formamide solution F of dimethylbenzene discharges from the bottom, absorption tower and first class purification gas G discharges from top, absorption tower, and first class purification gas G contains unabsorbed toluene in a small amount, butanone, again the dimethyl formamide that volatilizees in dimethylbenzene and the absorption process.

IV) first class purification gas G passes through adsorption treatment again, is separated into the gas H up to standard and the residual gas L that can directly enter atmosphere;

V) residual gas L repeating step II, III, IV carry out circular treatment.

Although the present invention describes with reference to specific embodiment, this description and not meaning that is construed as limiting the present invention.With reference to description of the invention, other of the disclosed embodiments changes, if all can expect for those skilled in the art, so, such variation should belong within this claim institute's restricted portion and the spirit.

Claims

1, the organic waste gas treatment method that produces in the artificial leather manufacture process is characterized in that comprising the steps:

I) with organic exhaust gas (A) the process cooling processing that produces in the artificial leather manufacture process, through after the one-level adsorption treatment at least, be separated into gas up to standard (B) that can directly enter atmosphere and the gas (C) that contains toluene, butanone, dimethylbenzene and dimethyl formamide high concentration again;

II) gas (C) is after supercooling, freezing processing, and part dimethyl formamide (D) is separated with the form of liquid state, and toluene, butanone, dimethylbenzene and a spot of dimethyl formamide are present in the residual gas (E);

III) utilize the absorption tower, with liquid dimethyl base formamide is absorbent, absorb toluene, butanone, dimethylbenzene in the residual gas (E), form the dimethyl formamide solution (F) that contains toluene, butanone, dimethylbenzene and discharge from top, absorption tower from discharge of bottom, absorption tower and first class purification gas (G);

IV) first class purification gas (G) is separated into the gas up to standard (H) and the residual gas (L) that can directly enter atmosphere through adsorption treatment;

V) residual gas (L) repeating step II, III, the IV of step IV discharge carry out circular treatment.

2, the organic waste gas treatment method that produces in the artificial leather manufacture process according to claim 1, it is characterized in that: adopt rotary-type inspissator adsorption treatment among above-mentioned steps I, the IV, the runner of described rotary-type inspissator adopts the molecular sieve manufacturing to form, rotary-type inspissator is divided into 3 zones, and one is that treatment region, one are that cooling zone, one are the renewing zones.

3, the organic waste gas treatment method that produces in the artificial leather manufacture process according to claim 2 is characterized in that: during above-mentioned rotary-type inspissator operate as normal rotating speed be 1 change～5 change/hour.

4, the organic waste gas treatment method that produces in the artificial leather manufacture process according to claim 1, it is characterized in that: adopt the cooling water heat exchanger cooling processing among the above-mentioned steps I, chilling temperature is 25 ℃～35 ℃, adopt in the Step II that cooling water heat exchanger, chilled water heat exchanger cool off, freezing processing, chilling temperature is 25 ℃～35 ℃, and cryogenic temperature is 0 ℃～5 ℃.