CN113144830A - VOC waste gas treatment device and technology in PVC glove production process - Google Patents
VOC waste gas treatment device and technology in PVC glove production process Download PDFInfo
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- CN113144830A CN113144830A CN202110226746.4A CN202110226746A CN113144830A CN 113144830 A CN113144830 A CN 113144830A CN 202110226746 A CN202110226746 A CN 202110226746A CN 113144830 A CN113144830 A CN 113144830A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- Treating Waste Gases (AREA)
Abstract
The invention relates to a VOC waste gas treatment device and process in the production process of PVC gloves, which comprises a waste gas absorption system and an absorption liquid regeneration system, wherein the waste gas absorption system comprises a waste gas induced draft fan, a DOTP absorption tower, a DOTP circulating pump, a water washing absorption tower and a water circulating pump, and the absorption liquid regeneration system comprises a regeneration tower, a condenser, a regeneration liquid tank, a vacuum pump and a regeneration liquid pump. The invention has small investment, the organic components in the waste gas come from the production device and finally return to the production device, thus changing waste into valuable, having remarkable economic benefit, low operation cost and simple maintenance, and being applicable to the processing and application occasions of PVC gloves and PVC paste resin, such as the production processes of PVC leather, PVC films and the like.
Description
Technical Field
The invention relates to the technical field of industrial waste gas purification, in particular to a VOC waste gas treatment device and technology in a PVC glove production process.
Background
The demand of medical and civil PVC gloves is increased rapidly, and the industry is greatly expanded. However, in the production process of the PVC gloves, a large amount of environment-friendly plasticizer dioctyl terephthalate (DOTP) and viscosity reducer D70 solvent oil (low aromatic hydrocarbon solvent oil mainly comprising C10-C13 straight-chain alkane) are used, the respective dosage can reach 30-45% and 10-20% of the total material dosage, and a large amount of high-concentration VOC (volatile organic compound) oil fume waste gas containing DOTP and D70 components can be generated in the processes of batching, die dipping, plasticizing, secondary plasticizing, drying and cooling, particularly high-temperature processes such as high-temperature baking plasticizing, drying and cooling. Wherein the DOTP boiling point is high, about 15-20% of DOTP enters the oil smoke in the production process, more than 98% of smog-like DOTP in the oil smoke waste gas can be removed under the actions of multi-stage condensation and electrostatic oil smoke trapping in the initial stage of oil smoke treatment, and the residual gas phase becomes organized waste gas which enters the atmosphere after being sprayed with water. The D70 solvent oil viscosity reducer added in the production process has a boiling range of 190-210 ℃ generally, and a large amount of D70 with the addition amount of more than 75-90% volatilizes into oil smoke along with the primary plasticizing process at a high temperature of 210 ℃, so that about 20% of condensation and removal efficiency exists in subsequent condensation and electrostatic trapping, and a large amount of residual gas phase becomes waste gas. At present, the production of PVC gloves enterprise has mostly set up the oil smoke and has collected and multistage condensation and electrostatic trap as the preliminary treatment, and the static trapping outlet waste gas VOC concentration summer is highest can reach 1500 ~ 2000mg/Nm3, can fall to 500 ~ 1000mg/Nm3 along with condensation efficiency promotion in winter, and the waste gas amount of wind is big moreover, and total emission is huge, pollutes seriously. Simultaneously, oil smoke, particles, odor and VOC pollutants are mixed in the VOC waste gas, the purification standard-reaching difficulty is very high, and the industrial treatment degree is very low.
The existing common VOCs purification methods comprise absorption, adsorption, combustion, catalytic oxidation, biological purification, photocatalysis, low-temperature plasma purification and the like, but for VOC (volatile organic compound) oil fume waste gas generated in the production of PVC (polyvinyl chloride) gloves, the adsorption method cannot solve the problem that high-boiling-point organic matters block and damage an adsorbent; the combustion and catalytic oxidation method has high investment and energy consumption under large wind quantity, and has huge oil smoke enrichment explosion-proof safety risk; the biological decomposition method has almost no effect on long straight-chain hydrocarbon, and the oil smoke seriously blocks biological fillers; the non-thorough harmless degradation processes such as photocatalytic oxidation and low-temperature plasma can only achieve the effect of chain scission and decomposition of long straight-chain hydrocarbon into small-molecular organic matters, and the VOC concentration is even observed to be greatly increased in practical tests.
The third stage of condensation of the process adopts 7 ℃ chilled water as a refrigerant, the waste gas is cooled to 10-15 ℃, DOTP residue in the waste gas at the outlet of the combined process device is very low, but the actual measurement of the VOC concentration formed by the light component D70 with a medium boiling point can still reach 500-1000 mg/Nm3, and the emission limit value reaching the standard can not be realized.
The patent CN205360981U, CN105688599A combines condensation, washing, electrostatic lampblack removal and zeolite wheel adsorption for recovering VOC, CN105854478A adopts secondary condensation, washing for lampblack removal and activated carbon adsorption for recovering organic matters, but in practical application, although a large amount of high-boiling-point plasticizer lampblack in the exhaust gas can intercept more than 98% of lampblack particles with particle size larger than or equal to 0.1 μm through condensation, electrostatic demisting and washing demisting processes, a large amount of high-boiling-point lampblack smoke with particle size smaller than or equal to 0.05 μm and unable to be removed by electrostatic trapping and washing methods still remains, and after directly entering a downstream activated carbon or zeolite wheel adsorption system, the life of the adsorbent will be substantially shortened, and in practical engineering, the adsorbent is very easy to be blocked and damaged, and is frequently replaced, and the operation and maintenance cost is very high.
The absorption method has strong adaptability to VOC components, concentration, air volume and the like, has wide application range, is simple to operate and maintain, does not need pretreatment, and has wide application in waste gas treatment in various industries. In the practice of VOC waste gas treatment in the PVC industry, an absorption method is mainly water spraying and washing. The water spray washing has no absorption effect on the water-insoluble gaseous D70 component, and only has the functions of trapping and removing the liquid mist remained in the upstream condensation and trapping process, and the VOC purification part is not involved.
In the process of purifying oil fume VOC of PVC gloves by adopting absorbent solution containing surfactant, the patents CN109966864A, CN106853321A and CN103007714A design the absorbent solution prepared by surfactant, inorganic auxiliary agent and the like to absorb and purify industrial organic waste gas, but in the practical use of purifying high-boiling oil fume in the PVC glove industry, long straight-chain alkane substances above C10 have high surface binding energy and large viscosity at normal temperature, have poor binding property with the surfactant, have a certain removing effect on water-insoluble VOC besides a better capturing effect on liquid mist, but because the concentration of waste gas is high, the solubilization and absorption capacity of the surfactant is limited, the absorption efficiency of the absorbent solution in engineering practice is generally lower than 40%, the concentration of VOC at the outlet of a device is still far higher than the standard requirement, and the industrial requirement cannot be completely met under the high pressure of the current VOC treatment.
Disclosure of Invention
The invention aims to overcome the defects and provides the VOC waste gas treatment device and the VOC waste gas treatment process in the production process of the PVC gloves, the investment is small, organic components in the waste gas come from a production device and finally return to the production device, the waste is changed into valuable, the economic benefit is remarkable, the operating cost is very low, and the maintenance is simple.
The purpose of the invention is realized as follows:
the utility model provides a VOC exhaust treatment device in PVC gloves production process, includes waste gas absorption system and absorption liquid regeneration system, waste gas absorption system includes waste gas draught fan, DOTP absorption tower, DOTP circulating pump, washing absorption tower and water circulating pump, absorption liquid regeneration system includes regeneration tower, condenser, regeneration fluid reservoir, vacuum pump and regeneration fluid pump.
Preferably, the water circulation pump draws water in the water-washing absorption tower from the bottom of the water-washing absorption tower to the upper part of the water-washing absorption tower, thereby forming a water circulation.
Preferably, waste gas passes through the waste gas draught fan and gets into the DOTP absorption tower, and the DOTP circulating pump is taken out the absorption liquid in the DOTP absorption tower to the upper portion of DOTP absorption tower from DOTP absorption tower column bottom, forms the circulation of DOTP absorption liquid.
Preferentially, waste gas passes through the waste gas draught fan and gets into the DOTP absorption tower, and the DOTP absorbed liquid of DOTP absorption tower bottom gets into the regenerator column, the regenerator column connects the condenser, the regenerated liquid jar is connected to the condenser, the vacuum pump is connected at the top of regenerated liquid jar, the regenerated liquid pump is connected to regenerated liquid jar bottom, the DOTP circulating pump is connected to the regenerated liquid pump, the DOTP circulating pump takes out the DOTP absorbed liquid to the upper portion of DOTP absorption tower sprays, forms the circulation of DOTP absorbed liquid.
Preferably, the DOTP absorption liquid is circularly absorbed, and after reaching a certain concentration, the DOTP absorption liquid is introduced into the regeneration tower.
The VOC waste gas treatment process in the production process of the PVC gloves adopts the device, and the waste gas treatment process comprises the following steps:
a. the waste gas enters a waste gas absorption system through a waste gas induced draft fan, a high boiling point organic solvent in the existing production is used as a waste gas absorbent for primary absorption, most of oily organic waste gas is absorbed, then the waste gas enters a water washing absorption tower, the residual organic waste gas and high boiling point organic matters volatilized from a DOTP absorption tower are absorbed, and finally the waste gas reaches the standard and is discharged;
circularly absorbing DOTP absorption liquid, and completely discharging the DOTP absorption liquid into a regeneration tower for regeneration or directly entering a PVC glove production system after reaching a certain concentration; or the DOTP absorption liquid at the bottom of the DOTP absorption tower enters a regeneration tower, and the absorption liquid returns to the PVC glove production system after regeneration or enters the DOTP absorption tower for further recycling.
Preferably, the DOTP absorption liquid enters a regeneration tower, a vacuum pump is started, when the vacuum degree reaches within 2500Pa, a heating medium is introduced into the regeneration tower to be heated to 160-class 220 ℃ for rectification separation, and after the rectification is finished, the purified high-boiling-point organic matters in the regeneration liquid tank are returned to the PVC glove production system through a regeneration liquid pump or enter the DOTP absorption tower for further recycling.
Preferably, when the COD in the water of the water washing absorption tower reaches 1000-50000mg/L, all the water is discharged and enters a waste water station, and the fresh water is replaced by the water-based tower for further circulation.
The invention has the beneficial effects that:
the invention has small investment, the organic components in the waste gas come from the production device and finally return to the production device, thus changing waste into valuable, having remarkable economic benefit, low operation cost and simple maintenance, and being applicable to the processing and application occasions of PVC gloves and PVC paste resin, such as the production processes of PVC leather, PVC films and the like.
Drawings
Fig. 1 is a schematic structural view of an exhaust gas absorption system according to embodiment 1 of the present invention.
FIG. 2 is a schematic view showing the structure of an absorption liquid regeneration system according to example 1 of the present invention.
Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.
Wherein: a waste gas induced draft fan 1; a DOTP absorber 2; a DOTP circulating pump 3; a water washing absorption tower 4; a water circulation pump 5; a regeneration tower 6; a condenser 7; a regenerated liquid tank 8; a vacuum pump 9; a regenerative liquid pump 10.
Detailed Description
Example 1:
referring to fig. 1 and 2, the invention relates to a VOC waste gas treatment device in a PVC glove production process, comprising a waste gas absorption system and an absorption liquid regeneration system, wherein the waste gas absorption system comprises a waste gas induced draft fan 1, a DOTP absorption tower 2, a DOTP circulating pump 3, a water washing absorption tower 4 and a water circulating pump 5, the absorption liquid regeneration system comprises a regeneration tower 6, a condenser 7, a regeneration liquid tank 8, a vacuum pump 9 and a regeneration liquid pump 10, and a heating pipe is arranged in the regeneration tower.
The water circulation pump 5 pumps the water in the water-washing absorption tower 4 from the bottom of the water-washing absorption tower 4 to the upper part of the water-washing absorption tower 4, thereby forming a water circulation.
Waste gas passes through waste gas draught fan 1 and gets into DOTP absorption tower 2, and DOTP circulating pump 3 takes out the absorption liquid in the DOTP absorption tower 2 to the upper portion of DOTP absorption tower 2 from DOTP absorption tower 2 tower bottom, forms the circulation of DOTP absorption liquid.
The waste gas enters a waste gas absorption system through a draught fan, high boiling point organic solvents such as DOTP (dioctyl terephthalate) or DOP (dioctyl phthalate) and the like in the existing production are used as waste gas absorbents for primary absorption, most of oily organic waste gas is absorbed, then the waste gas enters a water washing absorption tower, the residual organic waste gas and high boiling point organic matters such as DOTP or DOP and the like volatilized from the DOTP absorption tower are absorbed, and finally the waste gas reaches the standard and is discharged. And (3) circularly absorbing the DOTP absorption liquid, and completely discharging the DOTP absorption liquid into a regeneration system or directly entering a PVC glove production system after the DOTP absorption liquid reaches 1-10%. After the absorption liquid enters a regeneration tower, starting a vacuum pump, when the vacuum degree reaches within 2500Pa (absolute pressure), introducing a heating medium to raise the temperature to 220 ℃ for rectification separation, after the rectification is finished, introducing high-boiling-point organic matters such as DOTP (DOP) or DOP (dioctyl phthalate) and the like into a regeneration liquid tank, and returning the organic matters to a PVC (polyvinyl chloride) glove production system through a regeneration liquid pump or entering the DOTP absorption tower for further recycling. When the COD in the water of the water washing absorption tower reaches 1000-50000mg/L, all the water is discharged and enters a waste water station, and the fresh water is replaced by the water-based tower for further circulation.
Example 2:
referring to fig. 3, the invention relates to a VOC waste gas treatment device in the PVC glove production process, comprising a waste gas absorption system and an absorption liquid regeneration system, wherein the waste gas absorption system comprises a waste gas induced draft fan 1, a DOTP absorption tower 2, a DOTP circulating pump 3, a water washing absorption tower 4 and a water circulating pump 5, the absorption liquid regeneration system comprises a regeneration tower 6, a condenser 7, a regeneration liquid tank 8, a vacuum pump 9 and a regeneration liquid pump 10, and a heating pipe is arranged in the regeneration tower.
The water circulation pump 5 pumps the water in the water-washing absorption tower 4 from the bottom of the water-washing absorption tower 4 to the upper part of the water-washing absorption tower 4, thereby forming a water circulation.
Waste gas passes through waste gas draught fan 1 and gets into DOTP absorption tower 2, and the DOTP absorption liquid of DOTP absorption tower 2 bottom gets into regenerator column 6, regenerator column 6 connects condenser 7, regeneration fluid reservoir 8 is connected to condenser 7, vacuum pump 9 is connected at the top of regeneration fluid reservoir 8, regeneration liquid pump 10 is connected to regeneration fluid reservoir 8 bottom, DOTP circulating pump 3 is connected to regeneration liquid pump 10, DOTP circulating pump 3 takes out the DOTP absorption liquid to the upper portion of DOTP absorption tower 2 sprays, forms the circulation of DOTP absorption liquid.
And (3) allowing the DOTP absorption liquid to enter a regeneration tower, starting a vacuum pump, introducing a heating medium into the regeneration tower when the vacuum degree reaches within 2500Pa, raising the temperature to 160-class 220 ℃, performing rectification separation, and returning the purified high-boiling-point organic matters in a regeneration liquid tank to a PVC glove production system through a regeneration liquid pump or allowing the purified high-boiling-point organic matters to enter the DOTP absorption tower for further recycling after the rectification is finished.
The waste gas enters a waste gas absorption system through a draught fan, high boiling point organic solvents such as DOTP (dioctyl terephthalate) or DOP (dioctyl phthalate) and the like in the existing production are used as waste gas absorbents for primary absorption, most of oily organic waste gas is absorbed, then the waste gas enters a water washing absorption tower, the residual organic waste gas and high boiling point organic matters such as DOTP or DOP and the like volatilized from the DOTP absorption tower are absorbed, and finally the waste gas reaches the standard and is discharged. And (3) introducing DOTP absorption liquid at the bottom of the DOTP absorption tower into a regeneration tower, starting a vacuum pump, introducing a heating medium to raise the temperature to 220 ℃ when the vacuum degree reaches 2500Pa (absolute pressure), carrying out rectification separation, returning the liquid (absorbed waste gas components and a part of DOTP) condensed at the top of the tower to a production device for use, and returning the regeneration liquid tank to the production device or entering the absorption tower for further recycling after the rectification is finished, wherein the purified DOTP or DOP high-boiling-point organic matters are purified. When the COD in the water of the water washing absorption tower reaches 1000-50000mg/L, all the water is discharged and enters a waste water station, and the fresh water is replaced by the water-based tower for further circulation.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a VOC exhaust treatment device in PVC gloves production process which characterized in that: including waste gas absorption system and absorption liquid regeneration system, waste gas absorption system includes waste gas draught fan (1), DOTP absorption tower (2), DOTP circulating pump (3), washing absorption tower (4) and water circulating pump (5), absorption liquid regeneration system includes regeneration tower (6), condenser (7), regeneration fluid reservoir (8), vacuum pump (9) and regeneration fluid pump (10).
2. The device for treating VOC waste gas generated in the production process of PVC gloves according to claim 1, is characterized in that: the water circulation pump (5) pumps the water in the water washing absorption tower (4) from the bottom of the water washing absorption tower (4) to the upper part of the water washing absorption tower (4) to form water circulation.
3. The device for treating VOC waste gas generated in the production process of PVC gloves according to claim 1 or 2, wherein: waste gas passes through waste gas draught fan (1) and gets into DOTP absorption tower (2), and DOTP circulating pump (3) take out the absorption liquid in DOTP absorption tower (2) to the upper portion of DOTP absorption tower (2) from DOTP absorption tower (2) bottom of the tower, form the circulation of DOTP absorption liquid.
4. The device for treating VOC waste gas generated in the production process of PVC gloves according to claim 1 or 2, wherein: waste gas passes through waste gas draught fan (1) and gets into DOTP absorption tower (2), and the DOTP absorbed liquid of DOTP absorption tower (2) bottom gets into regenerator column (6), regenerator column (6) connection condenser (7), regeneration fluid reservoir (8) are connected in condenser (7), vacuum pump (9) are connected at the top of regeneration fluid reservoir (8), regeneration fluid pump (10) are connected to regeneration fluid reservoir (8) bottom, DOTP circulating pump (3) are connected in regeneration fluid pump (10), DOTP circulating pump (3) are taken out the DOTP absorbed liquid and are sprayed to the upper portion of DOTP absorption tower (2), form DOTP absorbed liquid circulation.
5. The VOC waste gas treatment device in the production process of the PVC gloves according to claim 3, characterized in that: and (3) circularly absorbing the DOTP absorption liquid, and introducing the DOTP absorption liquid into the regeneration tower after the DOTP absorption liquid reaches a certain concentration.
6. A VOC waste gas treatment process in a PVC glove production process is characterized in that: the apparatus according to any one of claims 1 to 5, wherein the exhaust gas treatment process comprises:
a. the waste gas enters a waste gas absorption system through a waste gas induced draft fan, a high boiling point organic solvent in the existing production is used as a waste gas absorbent for primary absorption, most of oily organic waste gas is absorbed, then the waste gas enters a water washing absorption tower, the residual organic waste gas and high boiling point organic matters volatilized from a DOTP absorption tower are absorbed, and finally the waste gas reaches the standard and is discharged;
circularly absorbing DOTP absorption liquid, and completely discharging the DOTP absorption liquid into a regeneration tower for regeneration or directly entering a PVC glove production system after reaching a certain concentration; or the DOTP absorption liquid at the bottom of the DOTP absorption tower enters a regeneration tower, and the absorption liquid returns to the PVC glove production system after regeneration or enters the DOTP absorption tower for further recycling.
7. The VOC waste gas treatment process in the production process of the PVC gloves according to claim 6, which is characterized in that: and (3) allowing the DOTP absorption liquid to enter a regeneration tower, starting a vacuum pump, introducing a heating medium into the regeneration tower when the vacuum degree reaches within 2500Pa, raising the temperature to 160-class 220 ℃, performing rectification separation, and returning the purified high-boiling-point organic matters in a regeneration liquid tank to a PVC glove production system through a regeneration liquid pump or allowing the purified high-boiling-point organic matters to enter the DOTP absorption tower for further recycling after the rectification is finished.
8. The VOC waste gas treatment process in the production process of the PVC gloves according to claim 6, which is characterized in that: when the COD in the water of the water washing absorption tower reaches 1000-50000mg/L, all the water is discharged and enters a waste water station, and the fresh water is replaced by the water-based tower for further circulation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023080545A1 (en) * | 2021-11-03 | 2023-05-11 | 한화솔루션 주식회사 | Method and apparatus for recovering unreacted monomer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023080545A1 (en) * | 2021-11-03 | 2023-05-11 | 한화솔루션 주식회사 | Method and apparatus for recovering unreacted monomer |
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