CN220110433U - Polyester rectification vacuum system - Google Patents
Polyester rectification vacuum system Download PDFInfo
- Publication number
- CN220110433U CN220110433U CN202321084606.9U CN202321084606U CN220110433U CN 220110433 U CN220110433 U CN 220110433U CN 202321084606 U CN202321084606 U CN 202321084606U CN 220110433 U CN220110433 U CN 220110433U
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- CN
- China
- Prior art keywords
- tail gas
- condenser
- pump
- roots
- polyester
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229920000728 polyester Polymers 0.000 title claims abstract description 27
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000003960 organic solvent Substances 0.000 claims abstract description 9
- 238000009833 condensation Methods 0.000 claims description 11
- 230000005494 condensation Effects 0.000 claims description 11
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 10
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 5
- 210000000078 claw Anatomy 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 12
- 238000004064 recycling Methods 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 239000002351 wastewater Substances 0.000 description 9
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000012224 working solution Substances 0.000 description 1
Landscapes
- Polyesters Or Polycarbonates (AREA)
Abstract
The utility model discloses a polyester rectification vacuum system which comprises a Roots pump group, a dry vacuum pump, an interstage condenser, a gas-liquid separator, a tail gas condenser and a second gas-liquid separator, wherein the Roots pump group is communicated with tail gas of a final polymerization reactor and a pre-polymerization reactor of a polyester rectification production line; the utility model uses the dry vacuum pump system to realize the vacuum of the polyester production line, thereby reducing the energy consumption of the vacuum system; and meanwhile, the interstage condenser and the second condenser can be used for recycling the organic solvent in the tail gas, so that the concentration of pollutants in the tail gas is reduced, and the burden of subsequent tail gas treatment is reduced while the loss is reduced.
Description
Technical Field
The utility model relates to the technical field of polyester production lines, in particular to a polyester rectification vacuum system.
Background
Polyesters, polymers obtained by polycondensation of polyols and polyacids are collectively referred to. Mainly refers to linear thermoplastic resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and polyarylate, and the like, and is engineering plastics with excellent performance and wide application. The chip polyester process route includes a direct esterification process (PTA process) and a transesterification process (DMT process). The PTA method has the advantages of low raw material consumption, short reaction time and the like, and becomes a main process and a preferred technical route of polyester. In the polymerization reaction stage, the method mainly comprises a prepolymerization reaction and a final polymerization reaction, and the vacuum degree in the reaction process has a great influence on the quality of polyester products and the removal of small molecules.
The multi-stage steam jet vacuum system or the multi-stage jet + liquid ring vacuum pump system adopted by the prior polyester production line vacuum system has the following problems in the operation process,
1. the steam jet energy consumption is high, and the steam jet is low in efficiency and high in steam consumption as a traditional vacuum obtaining device, and the steam for jet needs to be condensed through circulating water, so that the energy consumption is high.
2. The liquid ring pump has high energy consumption and low efficiency.
3. After condensing by a steam ejector or steam, organic matters such as cyclohexanone, cyclohexanol and the like are dissolved, so that high-concentration organic wastewater is formed;
4. if a multi-stage steam ejector and liquid ring vacuum pump system is adopted, the working solution discharged by the liquid ring vacuum pump is also high-concentration organic wastewater;
5. the waste water generated by the steam ejector or the liquid ring vacuum pump contains effective components such as glycol, acetaldehyde and the like with a certain concentration, if the waste water is not recycled, the waste of resources is caused, and the burden of sewage treatment is increased; if the effective components are recovered, a large amount of water is required to be evaporated by steam stripping, and the energy consumption is very high.
Disclosure of Invention
The technical purpose is that: aiming at the defects that the existing polyester production line vacuum system is high in energy consumption and easy to generate high-concentration organic wastewater to cause pollution, the utility model discloses a polyester rectification vacuum system capable of reducing the energy consumption of the vacuum system, recycling organic solvents and reducing the generation of organic wastewater.
The technical scheme is as follows: in order to achieve the technical purpose, the utility model adopts the following technical scheme:
the utility model provides a polyester rectification vacuum system, includes roots pump group, dry vacuum pump, interstage condenser, gas-liquid separator, tail gas condenser and second gas-liquid separator, roots pump group and polyester rectification production line end gather reactor and prepolymerization reation kettle's tail gas intercommunication, and interstage condenser and gas-liquid separator set gradually at roots pump group's exit end, to the organic solvent condensation recovery in the tail gas of mixing, and the tail gas after the condensation gets into dry vacuum pump, flows through tail gas condenser and second gas-liquid separator in proper order from dry vacuum pump's export, carries out the secondary condensation and discharges.
Preferably, a steam ejector and a mixing condenser are arranged between the Roots pump group and the tail gas outlet of the final polymerization reactor, the final polymerization tail gas of the final polymerization reactor enters the mixing condenser after being subjected to primary pressurization by the steam ejector, the pre-polymerization tail gas outlet end of the pre-polymerization reactor is also communicated with the mixing condenser, and the tail gas is matched with glycol steam entering the mixing condenser to be mixed and condensed and then enters the Roots pump group.
Preferably, the Roots pump set is at least two-stage Roots vacuum pumps, the tail gas outlet of the final polymerization reactor is communicated with the first-stage Roots vacuum pump, the prepolymerization tail gas is communicated with the second-stage Roots vacuum pump, and the tail gas after the first-stage compression is mixed with the prepolymerization tail gas and then enters the second-stage Roots vacuum pump.
Preferably, the dry vacuum pump of the present utility model employs a screw pump or a claw pump.
The beneficial effects are that: according to the polyester rectification vacuum system provided by the utility model, the vacuum of a polyester production line is realized by using a dry vacuum pump system, so that the energy consumption of the vacuum system is reduced; and meanwhile, the interstage condenser and the second condenser can be used for recycling the organic solvent in the tail gas, so that the concentration of pollutants in the tail gas is reduced, and the burden of subsequent tail gas treatment is reduced while the loss is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of a vacuum system according to the present utility model;
FIG. 2 is a block diagram of embodiment 2 of the present utility model;
wherein, 1-Roots pump group, 2-dry vacuum pump, 3-interstage condenser, 4-gas-liquid separator, 5-steam ejector, 6-mixing condenser, 7-first-stage Roots vacuum pump, 8-second-stage Roots vacuum pump.
Detailed Description
The present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the utility model are shown, but in which the utility model is not so limited.
The utility model discloses a polyester rectification vacuum system, which comprises a Roots pump group 1, a dry vacuum pump 2, an interstage condenser 3, a gas-liquid separator 4, a tail gas condenser and a second gas-liquid separator, wherein the Roots pump group 1 is communicated with tail gas of a final polymerization reactor and a pre-polymerization reaction kettle of a polyester rectification production line, the interstage condenser 3 and the gas-liquid separator 4 are sequentially arranged at the outlet end of the Roots pump group 1, organic solvents in mixed tail gas are condensed and recovered, the condensed tail gas enters the dry vacuum pump 2, and flows through the tail gas condenser and the second gas-liquid separator sequentially from the outlet of the dry vacuum pump 2 for secondary condensation and then is discharged.
In a specific embodiment, a steam ejector 5 and a mixing condenser 6 are arranged between the Roots pump group 1 and the tail gas outlet of the final polymerization reactor, the final polymerization tail gas of the final polymerization reactor enters the mixing condenser 6 after being subjected to primary pressurization by the steam ejector 5, the pre-polymerization tail gas outlet end of the pre-polymerization reaction kettle is also communicated with the mixing condenser 6, and the tail gas is mixed with glycol steam entering the mixing condenser for mixing and condensation and then enters the Roots pump group 1. The tail gas mixture and the glycol vapor mixture of the pre-polymerization tail gas are mixed and condensed in the mixing condenser 6, and the organic solvent contained in the tail gas is recovered, so that the concentration of the organic matters in the waste water subjected to the tail gas treatment is reduced, and meanwhile, compared with the recovery of the organic solvent and the like from the waste water, the interstage condensation mode is adopted, so that the energy consumption is reduced, and the treatment cost is saved.
In order to simplify the structure of the vacuum system, reduce the modification difficulty of the vacuum system and reduce the loss of the system, in another specific embodiment, as shown in fig. 2, a multi-stage Roots pump is directly used for a polyester production line, the Roots pump 1 is at least two stages of Roots vacuum pumps, the tail gas outlet of the final polymerization reactor is communicated with the first stage Roots vacuum pump 7 after passing through a gas-liquid separator, the prepolymerization tail gas is communicated with the second stage Roots vacuum pump 8, the final polymerization tail gas after being subjected to first stage compression is mixed with the prepolymerization tail gas and then enters the second stage Roots vacuum pump 8, and part of organic solvent can be recovered by setting the tail gas according to the process conditions after the Roots vacuum pump through an interstage cooler, and the dry vacuum pump 2 adopts a screw pump or a claw pump.
The following table shows the energy consumption analysis and comparison of the polyester vacuum system of the present utility model compared with the existing vacuum system:
by using the vacuum system provided by the utility model, the energy consumption of the vacuum system can be obviously saved, meanwhile, the recyclable organic medium in the tail gas can be recycled by utilizing a condensation mode, so that the vacuum system has good economic benefit, and compared with a wastewater evaporation and recycling mode, the energy consumption is further reduced, and the subsequent tail gas treatment is facilitated.
The foregoing is only a preferred embodiment of the utility model, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the utility model.
Claims (4)
1. The utility model provides a polyester rectification vacuum system, its characterized in that includes roots pump package (1), dry-type vacuum pump (2), interstage condenser (3), gas-liquid separator (4), tail gas condenser and second gas-liquid separator, roots pump package (1) and polyester rectification production line end gather the tail gas intercommunication of reactor and prepolymerization reactor, interstage condenser (3) and gas-liquid separator (4) set gradually in the exit end of roots pump package (1), retrieves the organic solvent condensation in the tail gas of mixing, and the tail gas after the condensation gets into dry-type vacuum pump (2), flows through tail gas condenser and second gas-liquid separator in proper order from the export of dry-type vacuum pump (2), carries out the secondary condensation and discharges.
2. The polyester rectification vacuum system according to claim 1, wherein a steam ejector (5) and a mixing condenser (6) are arranged between the Roots pump group (1) and the tail gas outlet of the final polymerization reactor, the final polymerization tail gas of the final polymerization reactor enters the mixing condenser (6) after being subjected to primary pressurization by the steam ejector (5), the pre-polymerization tail gas outlet end of the pre-polymerization reaction kettle is also communicated with the mixing condenser (6), and the tail gas enters the Roots pump group (1) after being matched with glycol steam entering the mixing condenser for mixing and condensation.
3. The polyester rectification vacuum system according to claim 1, wherein the Roots pump group (1) is at least two-stage Roots vacuum pumps, the tail gas outlet of the final polymerization reactor is communicated with the first-stage Roots vacuum pump (7), the prepolymerization tail gas is communicated with the second-stage Roots vacuum pump (8), and the final polymerization tail gas after the first-stage compression is mixed with the prepolymerization tail gas and enters the second-stage Roots vacuum pump (8).
4. A polyester rectification vacuum system according to claim 1, wherein said dry vacuum pump (2) is a screw pump or a claw pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321084606.9U CN220110433U (en) | 2023-05-08 | 2023-05-08 | Polyester rectification vacuum system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321084606.9U CN220110433U (en) | 2023-05-08 | 2023-05-08 | Polyester rectification vacuum system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220110433U true CN220110433U (en) | 2023-12-01 |
Family
ID=88894912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321084606.9U Active CN220110433U (en) | 2023-05-08 | 2023-05-08 | Polyester rectification vacuum system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220110433U (en) |
-
2023
- 2023-05-08 CN CN202321084606.9U patent/CN220110433U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A polyester distillation vacuum system Effective date of registration: 20231227 Granted publication date: 20231201 Pledgee: Bank of Nanjing Co.,Ltd. Jiangning sub branch Pledgor: NANJING VACUUM PUMP FACTORY CO.,LTD. Registration number: Y2023980074403 |