CN102585189A - Method and device for processing off-gases in productive process of polyester or copolyester - Google Patents
Method and device for processing off-gases in productive process of polyester or copolyester Download PDFInfo
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- CN102585189A CN102585189A CN2011104591755A CN201110459175A CN102585189A CN 102585189 A CN102585189 A CN 102585189A CN 2011104591755 A CN2011104591755 A CN 2011104591755A CN 201110459175 A CN201110459175 A CN 201110459175A CN 102585189 A CN102585189 A CN 102585189A
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Abstract
The invention discloses a method and device for processing off-gases in the productive process of polyester or copolyester. The method comprises the following steps of: firstly leading the vacuum off-gases containing tetrahydrofuran to be in contact with water vapor and absorbed through a water vapor injection pump, then sending a mixture of the vacuum off-gases and the water vapor to a spray absorber for carrying out spraying absorption once again; and directly sending the ordinary pressure or positive pressure off-gases containing tetrahydrofuran to the spray absorber for spraying absorption. The method and device provided by the invention can be used for processing the industrial off-gases generated by different devices in the productive process of polyester or copolyester in a differentiation manner; as one or more than two automatic regulating valves are arranged in a pipeline by which the vacuum tail gases are communicated to the water vapor injection pump, the automatic regulating valves can lead the pressures of the vacuum off-gases under different operating conditions to be kept in a constant working range so that a system can operate in a more stable condition. The device provided by the invention can avoid the probability to the maximum degree that inflammable and explosive objects are in contact with open fire, thereby the corresponding potential safety hazard is eliminated fundamentally.
Description
Technical field
The present invention relates to a kind of method and apparatus of handling tail gas in polyester or the co-polyester production process, 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; Primary and foremost purpose of the present invention is to provide the method for tail gas in a kind of safe and reliable processing polyester or the co-polyester production process; This 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.
Another object of the present invention 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 object of the invention is realized through following technical proposals:
A kind of method of handling tail gas in polyester or the co-polyester production process; Be will contain THF earlier vacuum tail gas through hydro-steam ejector pump and water vapor absorbing contacting, again vacuum tail gas and mixture of steam are sent to spray absorber and spray absorption once more; The normal pressure or the malleation tail gas that contain THF directly are sent to spray absorber and spray absorption;
The aqueous solution that has absorbed THF in the spray absorber is divided into two-way after through the heat exchange condensation, and one the tunnel is discharged into the THF regenerating column carries out subsequent disposal, and another road flows to spray absorber as water of condensation;
Described water vapor adopts the water vapor of 0.3 general in the polyester production process～0.6MPa;
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, hexanodioic 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, mainly comprise be used for aspiration vacuum tail gas hydro-steam ejector pump, be used to compile normal pressure tail gas engine manifold or tail gas buffer, be used to absorb the spray absorber and the water circulation system of tail gas;
Described hydro-steam ejector pump directly is communicated with spray absorber, and vacuum tail gas is transported to spray absorber after the water vapour absorption and absorbs further in hydro-steam ejector pump; The jet source pipeline of hydro-steam ejector pump directly is connected with the power steam that general facilities is produced;
In vacuum tail gas is communicated to the pipeline of hydro-steam ejector 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 water circulation system comprises parts such as recirculated water storage tank, water circulating pump, interchanger, and above-mentioned parts are communicated with successively; The bottom communication loop water storage tank of spray absorber, the current that absorbed THF are in the recirculated water storage tank.Water in the recirculated water storage tank (containing certain density THF) is being divided into two-way after the process interchanger heat exchange condensation under the suction of water circulating pump; One the tunnel is discharged into the THF regenerating column carries out subsequent disposal; Another road is transported to the top of spray absorber, is used for condensation, absorbs vacuum tail gas and normal pressure tail gas; The temperature of water of condensation is 4～45 ℃, preferred 10～20 ℃; For keeping the gaseous pressure balance of recirculated water tank top, the recirculated water storage tank is communicated with through pipeline with spray absorber; The recirculated water storage tank also is provided with the valve that is used for replenishing fresh water.
The present invention has following advantage and effect with respect to prior art:
1. apparatus and method of the present invention 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 hydro-steam ejector 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. apparatus and method of the present invention are carried 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. apparatus and method of the present invention are directly sent the condensed liquid that contains THF of spray absorber into the THF regenerating column and are 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, and therefore device of the present invention 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 a kind of structural representation of handling the device of tail gas in polyester or the co-polyester production process of the present invention; Wherein, 1-hydro-steam ejector pump, 2-pipeline, 3-pipeline, 4-pipeline, 5-spray absorber; The 6-pipeline, 7-pipeline, 8-fresh water valve, 9-recirculated water storage tank, 10-recycle pump, 11-interchanger; The 12-pipeline, 13-pipeline, 14-spray header, 15-tail gas buffer, 16-pipeline.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but embodiment of the present invention 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.
Embodiment
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 are sent in the hydro-steam ejector pump 1 through pipeline 2 and pipeline 3 respectively; Two strands of vacuum tail gas in hydro-steam ejector pump 1 with after high-pressure water vapor (being carried by pipeline 4) mixes; Be sent in the spray absorber 5 through hydro-steam ejector pump 1 together, and in spray absorber 5, spray absorption.The noncondensable gas that the water condensation that wherein is not condensed absorbs is sent to high altitude discharge through high altitude discharge pipeline 6; The aqueous solution that has wherein absorbed THF tail gas then flows into recirculated water storage tank 9 through pipeline 7, and through being divided into two-way after recycle pump 10 conveyings and interchanger 11 condensations: a route pipeline 16 is discharged in the THF recovery system and recycles; Another road then gets into spray absorber 5 once more, recycles.
Simultaneously, for the water yield in the replenishment system, and make recirculated water storage tank 9 maintain the certain liquid level height, the fresh water valve 8 at recirculated water storage tank 9 tops can periodically be opened.For keeping the gaseous pressure balance at recirculated water storage tank 9 tops, recirculated water storage tank 9 is communicated with through pipeline 12 with spray absorber 5.
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 consider on pipeline 2 and pipeline 3, automatic regulating valve to be set, regulate, keep the constant of working pressure separately through the aperture of automatic regulating valve.Simultaneously, for the total pressure that makes hydro-steam ejector pump 1 gas phase inlet 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 steam is monitored adjusting in real time on pipeline 4; 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.
Normal pressure tail gas in the PBT production process is pooled to earlier in the tail gas buffer 15; Send into then in the spray absorber 5 and spray absorption; In absorption tower 5; Contain the tail gas of THF and carry out direct condensation by contact through interchanger 11 condensed 10～20 ℃ of aqueous solution, the tetrahydrofuran aqueous solution that is condensed is discharged in the recirculated water storage tank 9 through pipeline 7, and the noncondensable gas that is not condensed directly imports to high altitude discharge through pipeline 6.
The foregoing description is a preferred implementation of the present invention; But embodiment of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (6)
1. method of handling tail gas in polyester or the co-polyester production process; It is characterized in that: the vacuum tail gas that will contain THF earlier is through hydro-steam ejector pump and water vapor absorbing contacting, again vacuum tail gas and mixture of steam is sent to spray absorber 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.
2. the method for tail gas in processing polyester according to claim 1 or the co-polyester production process; It is characterized in that: the aqueous solution that has absorbed THF in the spray absorber is divided into two-way after through the heat exchange condensation; One the tunnel is discharged into the THF regenerating column carries out subsequent disposal, and another road flows to spray absorber as water of condensation.
3. a device that is used for realizing the method for claim 1 or 2 described processing polyester or co-polyester production process tail gas is characterized in that comprising hydro-steam ejector pump, exhaust emissions house steward or tail gas buffer, spray absorber and water circulation system;
Described hydro-steam ejector pump directly is communicated with spray absorber;
Described exhaust emissions house steward or tail gas buffer are communicated with spray absorber;
Described water circulation system comprises recirculated water storage tank, water circulating pump, interchanger, and above-mentioned parts are communicated with successively, and pipeline is being communicated with THF regenerating column and spray absorber top respectively through after the interchanger; The bottom communication loop water storage tank of spray absorber.
4. device according to claim 3 is characterized in that: the recirculated water storage tank is communicated with through pipeline with spray absorber.
5. device according to claim 3 is characterized in that: the recirculated water storage tank is communicated with the fresh water pipeline.
6. device according to claim 3 is characterized in that: in vacuum tail gas is communicated to the pipeline of hydro-steam ejector pump, more than one automatic regulating valve is set.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102949917A (en) * | 2012-11-11 | 2013-03-06 | 奎屯达亿石油化工科技有限公司 | Naphthalene gas absorbing device and naphthalene gas absorbing method thereof |
| CN103463924A (en) * | 2013-08-29 | 2013-12-25 | 张家港市三联化工科技有限公司 | Adsorption device of synthesis tail gas of S-dichlorprop methyl ester |
| CN103566610A (en) * | 2013-10-30 | 2014-02-12 | 安徽神剑新材料股份有限公司 | Device for separating and collecting low-molecular-weight resin |
| CN106039916A (en) * | 2016-07-26 | 2016-10-26 | 北京华福工程有限公司 | System of lowering content of waste gas in solution polymerization rubber process |
| 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 |
| CN114425223A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran tail gas recovery system, method 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 |
| CN115350555A (en) * | 2022-08-05 | 2022-11-18 | 青岛金海晟环保设备有限公司 | Cooperative treatment method for pollution discharge in BDO-based biodegradable plastic production |
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| CN101564601A (en) * | 2008-04-23 | 2009-10-28 | 许培圣 | Method for absorbing tail gas from chemical production and device for preparing polyester resin by using same |
| CN202379922U (en) * | 2011-12-30 | 2012-08-15 | 金发科技股份有限公司 | Device for processing tail gas in polyester or copolyester production process |
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2011
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| US5466776A (en) * | 1994-06-03 | 1995-11-14 | Zimmer Aktiengesellschaft | Process for the multistage generation of vacuum for polyester production |
| CN101564601A (en) * | 2008-04-23 | 2009-10-28 | 许培圣 | Method for absorbing tail gas from chemical production and device for preparing polyester resin by using same |
| CN202379922U (en) * | 2011-12-30 | 2012-08-15 | 金发科技股份有限公司 | Device for processing tail gas in polyester or copolyester production process |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102949917A (en) * | 2012-11-11 | 2013-03-06 | 奎屯达亿石油化工科技有限公司 | Naphthalene gas absorbing device and naphthalene gas absorbing method thereof |
| CN103463924A (en) * | 2013-08-29 | 2013-12-25 | 张家港市三联化工科技有限公司 | Adsorption device of synthesis tail gas of S-dichlorprop methyl ester |
| CN103463924B (en) * | 2013-08-29 | 2016-01-27 | 张家港市三联化工科技有限公司 | The tail gas adsorption device of synthesis S-2-methyl chloropropionate |
| CN103566610A (en) * | 2013-10-30 | 2014-02-12 | 安徽神剑新材料股份有限公司 | Device for separating and collecting low-molecular-weight resin |
| CN106039916A (en) * | 2016-07-26 | 2016-10-26 | 北京华福工程有限公司 | System of lowering content of waste gas in solution polymerization rubber process |
| CN106039916B (en) * | 2016-07-26 | 2019-04-12 | 北京华福工程有限公司 | The system for reducing non-methane total hydrocarbons waste gas content in polymerisation in solution rubber process |
| 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 |
| CN114425223A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran tail gas recovery system, method and application |
| CN115350555A (en) * | 2022-08-05 | 2022-11-18 | 青岛金海晟环保设备有限公司 | Cooperative treatment method for pollution discharge in BDO-based biodegradable plastic production |
| CN115350555B (en) * | 2022-08-05 | 2024-04-16 | 青岛金海晟环保设备有限公司 | Synergistic treatment method for sewage in BDO-based biodegradable plastic production |
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