CN102585189B - 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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- CN102585189B CN102585189B CN 201110459175 CN201110459175A CN102585189B CN 102585189 B CN102585189 B CN 102585189B CN 201110459175 CN201110459175 CN 201110459175 CN 201110459175 A CN201110459175 A CN 201110459175A CN 102585189 B CN102585189 B CN 102585189B
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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 tetrahydrofuran (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 as US Patent No. 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 the polyester of raw material and copolyesters, under vacuum condition, water, 1, small-molecule substances such as 4-butyleneglycol and by product tetrahydrofuran (THF) are easier to separate from system.Therefore, with 1,4-butyleneglycol and di-carboxylic acid are in the production process of the polyester of raw material and copolyesters, 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 as the disclosed batch condensation polymerization reactor of patents such as US Patent No. 4680376, US7732556B2 except the lower concentration normal pressure tail gas that is produced by slurry preparing tank, butyleneglycol storage tank etc.
US Patent No. 5466776 and Chinese patent CN201474927U disclose a kind of by 1 respectively, 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 tetrahydrofuran (THF) divides two portions to handle: a part is directly separated in the gas-liquid separator of liquid-ring vacuum pump, carries out next step vent gas treatment; The tail gas that another part contains tetrahydrofuran (THF) is dissolved in 1, the 4-butyleneglycol, loops back the butyleneglycol knockout tower, discharges as the process tail gas of butyleneglycol knockout tower cat head.
US Patent No. 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 tetrahydrofuran (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 the tetrahydrofuran (THF) of accumulating in the butyleneglycol is separated.
Patent CN201628231U discloses a kind of mode of carrying by blower fan, normal pressure tail gas after organic stripping tower air lift 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 install the device that employing DCS Controlling System is controlled automatically additional at the pipeline of carrying for being guaranteed safety.
Patent CN101575122B discloses a kind of exhaust gas treating method of polyester normal pressure process tower, this method is with 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 for air lift 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, this method can reduce final COD content of discharging waste water, but needs to consume a large amount of cold washing water and air lift steam.
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 and running cost are low, 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 together easily the blast conveying of process tail gas of danger of air mixed.
Generally speaking, at present actually rare for the report of the condensed treatment process that contains tetrahydrofuran (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 tetrahydrofuran (THF) can not directly discharge, still need carry out further vent gas treatment.For the normal pressure tail gas that contains tetrahydrofuran (THF) of generations such as slurry preparing tank, butyleneglycol storage tank, the methods of burning that adopt are handled more at present.Owing to be different from acetaldehyde, very easily blast after tetrahydrofuran (THF) and the air mixed, therefore carry out the method that gas-liquid separation or tail gas carries with pressurized air as air lift or jet media and have certain danger, simultaneously, the process tail gas that contains tetrahydrofuran (THF) is carried out the inevitable waste that also can cause a large amount of tetrahydrofuran (THF) dischargings of burning disposal.
Summary of the invention
Some shortcomings at 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 the normal pressure that contains tetrahydrofuran (THF) or the malleation tail gas that produces as systems such as slurry preparing tank, butyleneglycol storage tanks, also can handle the vacuum tail gas that contains tetrahydrofuran (THF) that produces as 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 the normal pressure that contains tetrahydrofuran (THF) or the malleation tail gas that produces as systems such as slurry preparing tank, butyleneglycol storage tanks, also can handle the vacuum tail gas that contains tetrahydrofuran (THF) that produces as systems such as butyleneglycol knockout tower overhead condenser and vacuum systems simultaneously.
Purpose of the present invention is achieved through the following technical solutions:
A kind of method of handling tail gas in polyester or the co-polyester production process, be that the vacuum tail gas that will contain tetrahydrofuran (THF) earlier contacts absorption by hydro-steam ejector pump with water vapor, again vacuum tail gas and mixture of steam be sent to spray absorber and spray absorption again; Containing the normal pressure of tetrahydrofuran (THF) or malleation tail gas directly is sent to spray absorber and sprays absorption;
The aqueous solution that has absorbed tetrahydrofuran (THF) in the spray absorber is divided into two-way after through the heat exchange condensation, and one the tunnel is discharged into the tetrahydrofuran (THF) recovery tower 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 ethylene glycol, propylene glycol, 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, in phenylene-diacetic acid, phthalic acid, Succinic Acid, pentanedioic acid, hexanodioic acid, nonane diacid, sebacic acid, hendecane dicarboxylic acid, maleic anhydride or 1, the 1-cyclobutane dicarboxylic acid more than one.
A kind of device for the method that realizes above-mentioned processing polyester or co-polyester production process tail gas, mainly comprise aspiration vacuum tail gas hydro-steam ejector pump, be used for compiling normal pressure tail gas engine manifold or tail gas buffer, be used for absorbing spray absorber and the water circulation system of tail gas;
Described hydro-steam ejector pump directly is communicated with spray absorber, is transported to spray absorber after vacuum tail gas is absorbed by water vapour 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 has absorbed the current of tetrahydrofuran (THF) in the recirculated water storage tank.Water in the recirculated water storage tank (containing certain density tetrahydrofuran (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 tetrahydrofuran (THF) recovery tower 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 by pipeline with spray absorber; The recirculated water storage tank also is provided with for the valve that replenishes 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 the normal pressure that contains tetrahydrofuran (THF) or the malleation tail gas that produces as systems such as slurry preparing tank, butyleneglycol storage tanks, also can handle the vacuum tail gas that contains tetrahydrofuran (THF) that produces as 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, allows system move under more stable condition.
2. apparatus and method of the present invention are carried out the condensation absorption to the tail gas that contains tetrahydrofuran (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 tetrahydrofuran (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 tetrahydrofuran (THF) of spray absorber into the tetrahydrofuran (THF) recovery tower 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 investment and the running cost of device significantly.In addition, because with 1, the 4-butyleneglycol is in the device of the polyester of raw material production or copolyesters, most of device all can supporting installation tetrahydrofuran (THF) retrieving arrangement, therefore device of the present invention is directly sent the condensed liquid that contains tetrahydrofuran (THF) of spray absorber into the tetrahydrofuran (THF) retrieving arrangement and is carried out subsequent disposal, not only do not increase investment and the working cost of tetrahydrofuran (THF), and can improve the yield of tetrahydrofuran (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
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Production process with mutual-phenenyl two acid bromide two alcohol ester (hereinafter to be referred as PBT) is example, if adopt the vacuum tightness of keeping batch condensation polymerization reactor as US Patent No. 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: the vacuum tail gas that contains tetrahydrofuran (THF) and the condensed high density vacuum of butyleneglycol knockout tower overhead condenser tail gas that liquid-ring vacuum pump gas phase pipe is discharged are sent in the hydro-steam ejector pump 1 by 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 by 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 by high altitude discharge pipeline 6; The aqueous solution that has wherein absorbed tetrahydrofuran (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 tetrahydrofuran (THF) recovery system and recycles; Another road then enters spray absorber 5 again, 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 by 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 control in 80～100KPa scope, therefore work under each comfortable stable working pressure of keeping them, can consider at pipeline 2 and pipeline 3 automatic regulating valve to be set, aperture by automatic regulating valve is regulated, and keeps the constant of working pressure separately.Simultaneously, for the total pressure that makes hydro-steam ejector pump 1 gas phase entrance can change within the specific limits, can take a kind of control the in following two kinds of methods: 1. at pipeline 4 under meter is set the flow of injection water steam is monitored adjusting in real time; 2. the person in charge in pipeline 2 and pipeline 3 mixing increases the 3rd variable valve, and the method for the third gas nitrogen or other normal pressure tail gas of introducing by 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 tetrahydrofuran (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 by pipeline 7, and the noncondensable gas that is not condensed directly imports to high altitude discharge by pipeline 6.
Above-described embodiment is preferred implementation of the present invention; but embodiments of the present invention are 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 (2)
1. method of handling tail gas in the polyester production process, it is characterized in that: the vacuum tail gas that will contain tetrahydrofuran (THF) earlier contacts absorption by hydro-steam ejector pump with water vapor, again vacuum tail gas and mixture of steam is sent to spray absorber and sprays absorption again; Containing the normal pressure of tetrahydrofuran (THF) or malleation tail gas directly is sent to spray absorber and sprays absorption.
2. the method for tail gas in the processing polyester production process according to claim 1, it is characterized in that: the aqueous solution that has absorbed tetrahydrofuran (THF) in the spray absorber is divided into two-way after through the heat exchange condensation, one the tunnel is discharged into the tetrahydrofuran (THF) recovery tower carries out subsequent disposal, and another road flows to spray absorber as water of condensation.
3, a kind of device for the method that realizes claim 1 or 2 described processing 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 tetrahydrofuran (THF) recovery tower and spray absorber top respectively through after the interchanger; The bottom communication loop water storage tank of spray absorber;
The recirculated water storage tank is communicated with by pipeline with spray absorber;
The recirculated water storage tank is communicated with the fresh water pipeline.
4, 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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| CN 201110459175 CN102585189B (en) | 2011-12-30 | 2011-12-30 | Method and device for processing off-gases in productive process of polyester or copolyester |
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| CN 201110459175 CN102585189B (en) | 2011-12-30 | 2011-12-30 | Method and device for processing off-gases in productive process of polyester or copolyester |
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| CN102585189B true CN102585189B (en) | 2013-08-07 |
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Families Citing this family (8)
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| CN102949917B (en) * | 2012-11-11 | 2014-12-03 | 奎屯达亿石油化工科技有限公司 | Naphthalene gas absorbing device and naphthalene gas absorbing method thereof |
| 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 |
| 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 |
| 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 |
| 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 |
| 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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| DE4419397A1 (en) * | 1994-06-03 | 1995-12-14 | Zimmer Ag | Process for multi-stage vacuum generation in 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 |
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