CN202440456U - Device for treating tail gas during production process of polyester or copolyester - Google Patents
Device for treating tail gas during production process of polyester or copolyester Download PDFInfo
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- CN202440456U CN202440456U CN201120571383XU CN201120571383U CN202440456U CN 202440456 U CN202440456 U CN 202440456U CN 201120571383X U CN201120571383X U CN 201120571383XU CN 201120571383 U CN201120571383 U CN 201120571383U CN 202440456 U CN202440456 U CN 202440456U
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Abstract
The utility model discloses a device for treating tail gas during the production process of polyester or copolyester. The device comprises a water jet pump, a tail gas exhaust header pipe or a tail gas buffer tank, a spraying absorption tower, a water circulation system and a tetrahydrofuran recovery liquid automatic discharge system, wherein the water circulation system comprises a circulating water storage tank, a circulating water pump and a heat exchanger, and the parts are sequentially communicated; a pipeline is respectively communicated with the top of the spraying absorption tower and the water jet pump after passing the heat exchanger; a tail gas pipeline which is communicated with the lower part of a packing layer of the spraying absorption tower is arranged at the top of the circulating water storage tank, and the circulating water storage tank is communicated with a fresh water pipeline; the water jet pump is communicated with the circulating water storage tank through a tail pipe; and the tail gas buffer tank is communicated with the spraying absorption tower. The device disclosed by the utility model can treat the process tail gases containing different operation pressures, which is respectively generated by the different devices during the production process of the polyester or the copolyester, in a differential manner; and in addition, the opportunity of enabling flammable and explosive tetrahydrofuran to be in contact with open fire can be avoided as far as possible, and the corresponding potential safety hazard can be fundamentally eliminated.
Description
Technical field
The utility model relates to a kind of device of handling tail gas in polyester or the co-polyester production process, and this tail gas contains vacuum technology tail gas and normal pressure process tail gas simultaneously, and contains THF in the process tail gas.
Background technology
Polyester and copolyesters carry out polycondensation then and are prepared from normally by aromatic binary carboxylic acid, aliphatic dicarboxylic acid and aliphatic dihydroxy alcohol generation esterification or transesterification reaction.Disclosed like U.S. Pat 66570401B1, US7204962B2, US6018004, with 1,4-butyleneglycol and di-carboxylic acid; Particularly 1,4-butyleneglycol and aromatic acid are that esterification, transesterification reaction and polycondensation are all carried out under the vacuum decompression condition in the production of polyester and copolyesters of raw material; Under vacuum condition; Water, 1, small-molecule substances such as 4-butyleneglycol and by product THF are easier to from system, separate.Therefore; With 1; 4-butyleneglycol and di-carboxylic acid are in the production process of polyester and copolyesters of raw material; Process tail gas also comprises the vacuum tail gas and the high density vacuum tail gas that separates through butyleneglycol after the cat head condenser condenses is handled of the high density that produces like the disclosed batch condensation polymerization reactor of patents such as U.S. Pat 4680376, US7732556B2 except the lower concentration normal pressure tail gas that is produced by slurry preparing tank, butyleneglycol storage tank etc.
U.S. Pat 5466776 discloses a kind of by 1 respectively with Chinese patent CN201474927U; The device of 4-butanediol spraying pump and liquid-ring vacuum pump coupling carries out the method for vent gas treatment; The process tail gas that this device will contain THF divides two portions to handle: part direct separation in the gas-liquid separator of liquid-ring vacuum pump, carry out next step vent gas treatment; The tail gas that another part contains THF is dissolved in 1, in the 4-butyleneglycol, loops back the butyleneglycol knockout tower, discharges as the process tail gas of butyleneglycol knockout tower cat head.
U.S. Pat 7732556B2 discloses the method that one or more groups butanediol spraying pump of a kind of usefulness carries out the processing of polycondensation vacuum tail gas; This method for the THF tail gas content that guarantees to absorb in the hot trap of butyleneglycol less than 4%, need to consider to adopt separation methods such as distillation, fractionation by adsorption, membrane sepn and extraction that cumulative THF in the butyleneglycol is separated.
Patent CN201628231U discloses a kind of mode of carrying through blower fan; Normal pressure tail gas after organic stripping tower gas carried is directly sent into the method that the heating agent stove burns; This method need be chosen the gas blower of explosion-proof type and on the pipeline of carrying, install the device that adopts the DCS system to control automatically additional for being guaranteed safety.
Patent CN101575122B discloses a kind of exhaust gas treating method of polyester normal pressure process tower; This method is with the high density tail gas and the lower concentration tail gas separate treatment of process tower; To the high density tail gas at process tower top adopt first condensation again the method carried of gas handle; Then adopt the method for blast injection pump or hydro-steam ejector pump suction to transmit to lower concentration tail gas; The tail gas of last gas stripping column cat head is sent into after the tail gas mixing of squirt pump suction and is carried out burning disposal in the heating agent stove, and this method can reduce final COD content of discharging waste water, but needs to consume a large amount of gentle steam of carrying of cold washing water.
Patent CN201513900U discloses a kind of method that adopts jet ejector the normal pressure process tail gas to be carried out transport process; This method inserts the normal pressure tail gas of collecting the suction port of jet ejector; Earlier tail gas is sucked in the jet of jet ejector, directly send into incinerator again and carry out burning disposal.The investment of this method is low with running cost, and treatment effect is good, but because this method is carried out the conveying of tail gas with pressurized air as the jet media of the best, so this method and not being suitable for and air mixed together be prone to the to blast conveying of process tail gas of danger.
Generally speaking, at present actually rare for the report of the condensed treatment process that contains THF tail gas of butyleneglycol knockout tower overhead condenser.When with 1; When the 4-butyleneglycol prepares polyester as a kind of monomer component; Usually adopt the method for one or more couplings in butanediol spraying pump, lobe pump, the liquid-ring vacuum pump equal vacuum equipment that the high density vacuum tail gas that batch condensation polymerization reactor produces is handled; But adopt that this method handles the process tail gas that contains THF can not directly discharge, still need carry out further vent gas treatment.For the normal pressure tail gas that contains THF of generations such as slurry preparing tank, butyleneglycol storage tank, the method that many at present employings are burned is handled.Owing to be different from acetaldehyde; Very easily blast after THF and the air mixed; Therefore carry as gas with pressurized air or jet media carries out the method that gas-liquid separation or tail gas carries and has certain danger; Simultaneously, the process tail gas that contains THF is carried out the inevitable waste that also can cause a large amount of THF dischargings of burning disposal.
Summary of the invention
Some shortcomings to above-mentioned polyester or the existence of copolyesters vent gas treatment; The purpose of the utility model is to provide the device of tail gas in a kind of safe and reliable processing polyester or the co-polyester production process; This device can be handled normal pressure that contains THF or the malleation tail gas that produces like systems such as slurry preparing tank, butyleneglycol storage tanks, also can handle the vacuum tail gas that contains THF that produces like systems such as butyleneglycol knockout tower overhead condenser and vacuum systems simultaneously.
The purpose of the utility model realizes through following technical proposals:
A kind of method of handling tail gas in polyester or the co-polyester production process is will contain the vacuum tail gas of THF earlier through water jet pump and recirculated water absorbing contacting, and the vacuum tail gas that is not absorbed by water is sent to spray absorber again and sprays absorption once more; The normal pressure or the malleation tail gas that contain THF directly are sent to spray absorber and spray absorption;
The water that has absorbed vacuum tail gas is used separately as the water of condensation of spray absorber after through the heat exchange condensation and gets into once more in the water jet pump and vacuum tail gas absorbing contacting;
The tail gas that the water that is not condensed in the spray absorber absorbs is through the pipeline high altitude discharge, and the water of condensation that has absorbed THF then is discharged into the THF regenerating column automatically and carries out subsequent disposal.
Described polyester or copolyesters are prepared by aliphatic dihydroxy alcohol and aromatic acid or aliphatic dibasic acid;
Described aliphatic dihydroxy alcohol is 1,4-butyleneglycol and terepthaloyl moietie, Ucar 35,1, the mixture of more than one compositions in 2-butyleneglycol or the pentanediol;
Described aromatic acid or aliphatic dibasic acid be terephthalic acid, phthalic acid, m-phthalic acid, to phenylene-diacetic acid, phthalic acid, Succinic Acid, pentanedioic acid, adipic acid, nonane diacid, sebacic acid, hendecane dicarboxylic acid, maleic anhydride or 1, more than one in the 1-CBDCA.
A kind of device that is used for realizing the method for above-mentioned processing polyester or co-polyester production process tail gas comprises being used for the water jet pump of aspiration vacuum tail gas, the engine manifold or the tail gas buffer that are used to compile normal pressure tail gas, the spray absorber that is used to absorb tail gas, water circulation system and THF recovering liq automatic discharge system;
Described water circulation system comprises parts such as recirculated water storage tank, water circulating pump, interchanger, and above-mentioned parts are communicated with successively; Pipeline is being communicated with spray absorber top and water jet pump respectively through after the interchanger.Water in the recirculated water storage tank (containing certain density THF) under the suction of water circulating pump through interchanger heat exchange condensation after, a part descend from the top spray of spray absorber, is used for condensation, absorption normal pressure tail gas; A part flows in the water jet pump, is used for condensation, absorbs vacuum tail gas; The temperature of water of condensation is 4～45 ℃, preferred 10～20 ℃.The recirculated water tank top is provided with exhaust pipe and is communicated with the packing layer bottom of spray absorber, and unabsorbed vacuum tail gas is gone to spray absorber through pipeline and absorbed further in the recirculated water storage tank; The recirculated water storage tank also is provided with the valve that is used for replenishing fresh water, and the recirculated water storage tank is communicated with the fresh water pipeline through this valve.
Described water jet pump is communicated with the recirculated water storage tank through tail pipe, and vacuum tail gas is absorbed the back by current and flows in the recirculated water storage tank in water jet pump;
In vacuum tail gas is communicated to the pipeline of water jet pump, more than one automatic regulating valve is set, this automatic regulating valve can make the pressure of the vacuum tail gas under the different operating condition remain in the constant working range;
Described engine manifold or tail gas buffer are communicated with spray absorber, and the normal pressure tail gas that produces in polyester or the co-polyester production process is pooled to engine manifold or tail gas buffer earlier, and then go to spray absorber and spray absorption;
Described spray absorber can adopt prior art, can perhaps its internal structure be designed to structure formations such as spray-type, umbrella crown formula, water diversion disk formula, baffle plate type or sieve-board type at the inside of tower filling filler;
Described THF recovering liq automatic discharge system is a U type pipeline; One end of pipeline is communicated with the spray absorber bottom; The other end of pipeline leads to the THF regenerating column, and U type pipeline is in the fluid-tight state all the time, and the water of condensation that has absorbed THF is discharged by U type pipeline automatically; For keeping U type pipe air pressure inside and outside drain air pressure balance, U type pipeline can be set to be communicated with the spray absorber top.The annexation of said THF recovering liq automatic discharge system is: the spray absorber bottom is through pipeline communication loop water storage tank, and the aqueous solution that has absorbed THF in the spray absorber flows in the recirculated water storage tank; In addition, pipeline through after the interchanger also branch have one the tunnel recirculated water is transported to the THF retrieving arrangement recycles.
The utility model has following advantage and effect with respect to prior art:
1. the device of the utility model can be handled the process tail gas that contains different operating pressure that devices different in polyester or co-polyester production process produces differentially; These apparatus and method can be handled normal pressure that contains THF or the malleation tail gas that produces like systems such as slurry preparing tank, butyleneglycol storage tanks, also can handle the vacuum tail gas that contains THF that produces like systems such as butyleneglycol knockout tower overhead condenser and vacuum systems simultaneously.In addition; Owing to the automatic regulating valve that is provided with one or more in the pipeline that is communicated to water jet pump at vacuum tail gas; This automatic regulating valve can make the pressure of the vacuum tail gas under the different operating condition remain in the constant working range, lets system under more stable condition, move.
2. the device of the utility model carries out condensed and absorbed to the tail gas that contains THF that produces in polyester or the co-polyester production process; And do not carry out burning disposal; Therefore need not to take special transmitting device that tail gas is carried out transmission process; The chance that this device can avoid the inflammable and explosive substances THF to contact with naked light has most possibly fundamentally been eliminated corresponding potential safety hazard.
3. the device of the utility model is directly sent the condensed liquid that contains THF of spray absorber into the THF regenerating column and is carried out subsequent disposal; Need not behind spray absorber to increase device such as stripping tower and carry out stripping process, can reduce the investment and the running cost of device significantly.In addition; Because with 1; The 4-butyleneglycol is in the device of polyester or copolyesters of raw material production, the retrieving arrangement that most of device all can supporting installation THF, so the device of the utility model is directly sent the condensed liquid that contains THF of spray absorber into the THF retrieving arrangement and is carried out subsequent disposal; Not only do not increase the investment and the working cost of THF, and can improve the yield of THF.
Description of drawings
Fig. 1 is the structural representation that 1 one kinds of the utility model embodiment handle the device of tail gas in polyester or the co-polyester production process; Wherein, 1-water jet pump, 2-pipeline, 3-pipeline, 4-interchanger; The 5-water circulating pump, 6-fresh water valve, 7-recirculated water storage tank, the tail pipe of 8-water jet pump, 9-pipeline; The 10-pipeline, 11-pipeline, 12-spray header, 13-spray absorber; The 14-pipeline, 15-pipeline, 16-U type fluid-tight pipeline, 17-tail gas buffer.
Fig. 2 is the structural representation that 2 one kinds of the utility model embodiment handle the device of tail gas in polyester or the co-polyester production process; Wherein, 1-water jet pump, 2-pipeline, 3-pipeline, 4-interchanger, 5-water circulating pump; 6-fresh water valve, 7-recirculated water storage tank, the tail pipe of 8-water jet pump, 9-pipeline, 10-pipeline, 11-pipeline; The 12-spray header, 13-spray absorber, 14-pipeline, 15-pipeline, 16-pipeline, 17-tail gas buffer.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but the embodiment of the utility model is not limited thereto.
Production process with mutual-phenenyl two acid bromide two alcohol ester (hereinafter to be referred as PBT) is an example; If adopt the vacuum tightness of keeping batch condensation polymerization reactor like U.S. Pat 5466776 described vacuum systems; Then process tail gas also comprises the high density vacuum tail gas after butyleneglycol separates the cat head condenser condenses and the vacuum tail gas of the high density of discharging through liquid-ring vacuum pump gas phase pipe except the lower concentration normal pressure tail gas that is produced by slurry preparing tank, butyleneglycol storage tank etc. in the production process of PBT.
A kind of device of handling tail gas in polyester or the co-polyester production process, as shown in Figure 1.Vacuum tail gas that contains THF that liquid-ring vacuum pump gas phase pipe is discharged and the condensed high density vacuum of butyleneglycol knockout tower overhead condenser tail gas get into water jet pump 1 through pipeline 2 and pipeline 3 respectively.Water jet pump 1 is communicated with recirculated water storage tank 7 through tail pipe 8; Two strands of vacuum tail gas in the water jet pump 1 are after the high pressure water that water circulating pump 5 produces absorbs; Tail pipe 8 through water jet pump enters in the recirculated water storage tank 7 together, and in recirculated water storage tank 7, carries out gas-liquid separation.
Because the pressure of butyleneglycol knockout tower is controlled in 40～60KPa scope usually in the PBT device; And the pressure of rotary pump with liquid ring is suitable for being controlled in 80～100KPa scope; Therefore each comfortable stable working pressure is worked down in order to keep them; Can on pipeline 2 and pipeline 3, automatic regulating valve be set, regulate, keep the constant of working pressure separately through the aperture of automatic regulating valve.Simultaneously, can change within the specific limits, can take a kind of control the in following two kinds of methods: 1. under meter is set the flow of injection water is monitored adjusting in real time on pipeline 10 in order to make water jet pump 1 gas phase inlet total pressure; 2. being responsible at pipeline 2 and pipeline 3 blended increases the 3rd variable valve, and the method for the third gas nitrogen or other normal pressure tail gas of introducing through the pipeline at this variable valve place is kept the constant of vacuum engine manifold pressure.
Recirculated water storage tank 7 is through the bottom of pipeline 9 through spray absorber 13 packing layers; Simultaneously, recirculated water storage tank 7 also is communicated with recycle pump 5, interchanger 4 successively, and the pipeline bifurcated is communicated with spray absorber 13 tops and water jet pump 1 respectively after process interchanger 4.The aqueous solution that has absorbed THF tail gas in the recirculated water storage tank 7 then can be carried and after interchanger 4 condensations, recycle once more through recycle pump 5.Recirculated water storage tank 7 also is communicated with the fresh water pipeline through fresh water valve 6, replenishes fresh water.
Be not sent to through pipeline 9 with rare gas element in the recirculated water storage tank 7 and again spray absorption in the spray absorber 13 by the part THF tail gas of thorough absorption.
Spray absorber 13 tops have pipeline 15 to carry out emptying, and the fluid-tight pipeline 16 of its 13 bottom through the U type is discharged into the THF retrieving arrangement with the tetrahydrofuran aqueous solution of condensation and recycles.In spray absorber 13; The tail gas that contains THF with through the direct condensation by contact of the interchanger 4 condensed aqueous solution (10～20 ℃ of temperature); The fluid-tight pipeline 16 of the tetrahydrofuran aqueous solution that is condensed through the U type is discharged into the THF retrieving arrangement and recycles, and the gas that is not condensed imports to high altitude discharge through pipeline 15.One end of U type pipeline 16 is communicated with spray absorber 13, and the other end of pipeline 16 leads to the THF regenerating column, and U type pipeline is in the fluid-tight state all the time, and the water of condensation that has absorbed THF is discharged by U type pipeline 16 automatically.For keeping U type pipe air pressure inside and outside drain air pressure balance, U type pipeline 16 is communicated with spray absorber 13 tops.
Embodiment 2
A kind of device of handling tail gas in polyester or the co-polyester production process; As shown in Figure 2; The difference that itself and embodiment 1 install is THF recovering liq automatic discharge system; Spray absorber 13 bottoms that are the present embodiment device are through pipeline 14 communication loop water storage tanks 7, and the aqueous solution that has absorbed THF in the spray absorber 13 flows in the recirculated water storage tank 7; In addition, pipeline through after the interchanger 4 also branch have one tunnel (being pipeline 16) that recirculated water is transported to the THF retrieving arrangement to recycle.
Structure, annexation and the principle of work of other parts of present embodiment device is with the device of embodiment 1.
The foregoing description is the utility model preferred implementation; But the embodiment of the utility model is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit and the principle of the utility model, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within the protection domain of the utility model.
Claims (5)
1. a device of handling tail gas in polyester or the co-polyester production process is characterized in that: comprise water jet pump, exhaust emissions house steward or tail gas buffer, spray absorber, water circulation system and THF recovering liq automatic discharge system;
Described water circulation system comprises recirculated water storage tank, water circulating pump, interchanger, and above-mentioned parts are communicated with successively; Pipeline is being communicated with spray absorber top and water jet pump respectively through after the interchanger; Said recirculated water tank top is provided with exhaust pipe and is communicated with the packing layer bottom of spray absorber, and the recirculated water storage tank is communicated with the fresh water pipeline;
Described water jet pump is communicated with the recirculated water storage tank through tail pipe;
Described tail gas buffer is communicated with spray absorber.
2. device according to claim 1 is characterized in that: described THF recovering liq automatic discharge system is a U type pipeline, and an end of pipeline is communicated with the spray absorber bottom, and the other end of pipeline leads to the THF regenerating column.
3. device according to claim 2 is characterized in that: described U type pipeline is communicated with the spray absorber top.
4. device according to claim 1 is characterized in that: the annexation of said THF recovering liq automatic discharge system is: the bottom of said spray absorber is through pipeline communication loop water storage tank; Pipeline is having one the road to go to the THF regenerating column through also dividing after the interchanger.
5. device according to claim 1 is characterized in that: in vacuum tail gas is communicated to the pipeline of water jet pump, more than one automatic regulating valve is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120571383XU CN202440456U (en) | 2011-12-30 | 2011-12-30 | Device for treating tail gas during production process of polyester or copolyester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120571383XU CN202440456U (en) | 2011-12-30 | 2011-12-30 | Device for treating tail gas during production process of polyester or copolyester |
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| CN202440456U true CN202440456U (en) | 2012-09-19 |
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| CN201120571383XU Expired - Lifetime CN202440456U (en) | 2011-12-30 | 2011-12-30 | Device for treating tail gas during production process of polyester or copolyester |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102585190A (en) * | 2011-12-30 | 2012-07-18 | 金发科技股份有限公司 | Method and device for processing off-gases in productive process of polyester or copolyester |
| CN105031961A (en) * | 2015-07-22 | 2015-11-11 | 台州市众力化工设备制造有限公司 | Waste gas eliminating method and device in polyester resin production process |
| CN108250065A (en) * | 2016-12-28 | 2018-07-06 | 中昊晨光化工研究院有限公司 | It is a kind of that the device and method that perfluoro caprylic acid is recycled in tail gas is dried from fluoropolymer |
| CN114425220A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran-containing tail gas treatment method, system and application |
| CN114425219A (en) * | 2020-09-28 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran tail gas treatment method, system and application |
-
2011
- 2011-12-30 CN CN201120571383XU patent/CN202440456U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102585190A (en) * | 2011-12-30 | 2012-07-18 | 金发科技股份有限公司 | Method and device for processing off-gases in productive process of polyester or copolyester |
| CN105031961A (en) * | 2015-07-22 | 2015-11-11 | 台州市众力化工设备制造有限公司 | Waste gas eliminating method and device in polyester resin production process |
| CN108250065A (en) * | 2016-12-28 | 2018-07-06 | 中昊晨光化工研究院有限公司 | It is a kind of that the device and method that perfluoro caprylic acid is recycled in tail gas is dried from fluoropolymer |
| CN108250065B (en) * | 2016-12-28 | 2020-05-22 | 中昊晨光化工研究院有限公司 | Device and method for recovering perfluorooctanoic acid from fluoropolymer drying tail gas |
| CN114425219A (en) * | 2020-09-28 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran tail gas treatment method, system and application |
| CN114425220A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran-containing tail gas treatment method, system and application |
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Granted publication date: 20120919 |