CN103360211B - Improved ethylene glycol production system - Google Patents
Improved ethylene glycol production system Download PDFInfo
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- CN103360211B CN103360211B CN201310299671.8A CN201310299671A CN103360211B CN 103360211 B CN103360211 B CN 103360211B CN 201310299671 A CN201310299671 A CN 201310299671A CN 103360211 B CN103360211 B CN 103360211B
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- ethylene glycol
- liquid seal
- seal trough
- receiving tank
- reuse
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The invention discloses an improved ethylene glycol production assembly which comprises a first ethylene glycol liquid seal trough, a second ethylene glycol liquid seal trough, a third ethylene glycol liquid seal trough, a fourth ethylene glycol liquid seal trough, an evaporator, an ethylene glycol low-point collecting trough, a separation tower, a recycled ethylene glycol collecting trough and a slurry blending tank, wherein a first heat exchanger is arranged on a pipeline between the outlet of the evaporator and the recycled ethylene glycol collecting trough; a pipeline for fresh ethylene glycol passes through the first heat exchanger and subsequently enters the evaporator; a second heat exchanger is arranged on a pipeline between the outlet of the separation tower and the recycled ethylene glycol collecting trough; a pipeline of the ethylene glycol low-point collecting trough to the separation tower also passes through the second heat exchanger. Compared with the prior art, the improved ethylene glycol production system has the advantages that the stability of density and flow of EG (Ethylene Glycol) is improved, the instability in operation is effectively avoided, and meanwhile the waste heat in a device is sufficiently utilized, and the purposes of reducing the energy consumption and saving the energy are achieved.
Description
Technical field
The present invention relates to the structure that in a kind of production of polyester, ethylene glycol is collected and flowed to.
Background technology
In the device of producing PET, to use a large amount of fresh EG (ethylene glycol) and reuse EG.Existing ethylene glycol production combination device as shown in Figure 1, specifically comprises the first ethylene glycol liquid seal trough 11a, the second ethylene glycol liquid seal trough 12a, triethylene glycol liquid seal trough 13a, TEG liquid seal trough 14a, vaporizer 2a, ethylene glycol low spot receiving tank 3a, knockout tower 4a, reuse ethylene glycol receiving tank 5a and slurry preparation 6a; The first ethylene glycol liquid seal trough 11a, the second ethylene glycol liquid seal trough 12a are all connected with the import of ethylene glycol low spot receiving tank 3a, and the output tube by is separately connected with plate-type heat exchanger separately respectively; Triethylene glycol liquid seal trough 13a is connected with the import of reuse ethylene glycol receiving tank 5a by branch line separately respectively with TEG liquid seal trough 14a, and triethylene glycol liquid seal trough 13a and TEG liquid seal trough 14a another branch line by is separately connected with plate-type heat exchanger separately; The output tube a-road-through of ethylene glycol low spot receiving tank 3a is to knockout tower 4a, and reuse ethylene glycol receiving tank 5a is directly led on a road, and knockout tower 4a mono-road output tube leads to reuse ethylene glycol receiving tank 5a; The pipeline 21a of virgin ethylene glycol is connected with the import of vaporizer 2, and the outlet of vaporizer 2a is connected with reuse ethylene glycol receiving tank 5a, and reuse ethylene glycol receiving tank 5a is connected with the import of slurry preparation 6a.
Wherein prepare auxiliary material additive and the vacuum state that improves polycondensation section by the fresh EG of water content approximately 0.1%, reuse EG is made up of the EG of knockout tower processing and the EG of polycondensation part, its water content approximately 1.5% left and right is to prepare slurry with reuse EG in production of polyester.The EG that ethylene glycol low spot receiving tank is collected is delivered to knockout tower through Send out pump and carries out rectifying separation, when high the giving the correct time of ethylene glycol low spot receiving tank liquid level, deliver to reuse ethylene glycol receiving tank temporarily, because of the EG water content higher (approximately 13%) of ethylene glycol low spot receiving tank, cause the EG water content of reuse ethylene glycol receiving tank to increase, caused the problems such as wet end furnish is unbalance, esterification yield is low, process operation is unstable to occur.High temperature EG after the displacement of each vaporizer directly drains into reuse ethylene glycol receiving tank, and the temperature of the preparation slurry EG that raise, has affected slurry temperature, causes slurry density, slurry flow unstable.The EG water content lower (being less than 1%) of the poly-part of final minification, can directly send to preparation slurry, but in actual production, be to be first delivered to reuse ethylene glycol receiving tank, send to preparation slurry through the transferpump of reuse ethylene glycol receiving tank again, caused the unnecessary circulation of EG.As can be seen here, above some invisible waste that has increased the unstable and energy of process operation aborning.The unstable and save energy, the reduction energy consumption that so how to reduce explained hereafter become a key problem in technology point.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of stable ethylene glycol production combination device for the above-mentioned state of the art.
Another technical problem to be solved by this invention is to provide for the above-mentioned state of the art ethylene glycol production combination device that a kind of energy consumption is low.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of improved ethylene glycol production combination device, comprises the first ethylene glycol liquid seal trough, the second ethylene glycol liquid seal trough, triethylene glycol liquid seal trough, TEG liquid seal trough, vaporizer, ethylene glycol low spot receiving tank, knockout tower, reuse ethylene glycol receiving tank and slurry preparation;
Aforesaid the first ethylene glycol liquid seal trough, the second ethylene glycol liquid seal trough are all connected with the import of ethylene glycol low spot receiving tank, and the output tube by is separately connected with plate-type heat exchanger separately respectively;
Aforesaid triethylene glycol liquid seal trough is connected with the import of reuse ethylene glycol receiving tank by branch line separately respectively with TEG liquid seal trough, and triethylene glycol liquid seal trough and TEG liquid seal trough another branch line by is separately connected with plate-type heat exchanger separately;
The output tube a-road-through of aforesaid ethylene glycol low spot receiving tank is to knockout tower, and a-road-through is to reuse ethylene glycol receiving tank, and knockout tower Yi road output tube leads to reuse ethylene glycol receiving tank;
The pipeline of virgin ethylene glycol is connected with the import of vaporizer, and the outlet of vaporizer is connected with reuse ethylene glycol receiving tank, and reuse ethylene glycol receiving tank is connected with the import of slurry preparation,
It is characterized in that
Pipeline between the outlet of described vaporizer and reuse ethylene glycol receiving tank is provided with First Heat Exchanger, and the pipeline of virgin ethylene glycol is by entering in vaporizer after aforesaid First Heat Exchanger;
Pipeline between the outlet of described knockout tower and reuse ethylene glycol receiving tank is provided with the second interchanger, and ethylene glycol low spot receiving tank leads to the pipeline of knockout tower also by this second interchanger.
Between described first outlet of ethylene glycol liquid seal trough and the import of knockout tower, be connected with the first pipe, this first pipe is provided with the first valve.When ethylene glycol low spot receiving tank liquid level, Gao Shizai enables ethylene glycol transferpump, with brownout.
Further, the first described pipe is connected with the import of knockout tower by after the second interchanger.
Between the import of the outlet of described the second ethylene glycol liquid seal trough and the first ethylene glycol liquid seal trough, be connected with the second pipe, this second pipe is provided with the second valve.Reduce the water content of EG in the first liquid seal trough, improved the vacuum state of the first Prepolycondensating reactor system, reduced the load of liquid-ring vacuum pump.
Between the outlet of described triethylene glycol liquid seal trough and slurry preparation, be connected with the 3rd pipe, the 3rd pipe is provided with the 3rd valve, is connected with the 4th pipe between the outlet of described TEG liquid seal trough and slurry preparation, and the 4th pipe is provided with the 4th valve.By this kind of design improvement, reduce the electric power energy waste and the mechanical means loss that cause extra increase because of EG unnecessary circulation in system.
Compared with prior art, the invention has the advantages that: bring up to the EG of knockout tower and join the temperature of fresh EG of each vaporizer, reduce knockout tower and the each vaporizer EG temperature to reuse ethylene glycol receiving tank, the density of EG and the stability of flow are improved, effectively avoid the unstable of operation, meanwhile, take full advantage of the waste heat in device, played reduction energy consumption, the effect of save energy, and, can reduce the tail gas amount of carrying secretly of slurry preparation groove, reduce the unit consumption of raw material.
Brief description of the drawings
Fig. 1 is ethylene glycol production combination apparatus structure schematic diagram in prior art.
Fig. 2 is example structure schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
As shown in Figure 2, the ethylene glycol production combination device in the present embodiment comprises the first ethylene glycol liquid seal trough 11, the second ethylene glycol liquid seal trough 12, triethylene glycol liquid seal trough 13, TEG liquid seal trough 14, vaporizer 2, ethylene glycol low spot receiving tank 3, knockout tower 4, reuse ethylene glycol receiving tank 5 and slurry preparation 6.
The first ethylene glycol liquid seal trough 11, the second ethylene glycol liquid seal trough 12 are all connected with the import of ethylene glycol low spot receiving tank 3, and the output tube by separately and plate-type heat exchanger separately (in figure without demonstration) are connected respectively; Triethylene glycol liquid seal trough 13 is connected with the import of reuse ethylene glycol receiving tank 5 by branch line separately respectively with TEG liquid seal trough 14, and triethylene glycol liquid seal trough 13 and TEG liquid seal trough 14 another branch line by separately and plate-type heat exchanger separately (in figure without showing) are connected.
The output tube a-road-through of ethylene glycol low spot receiving tank 3 is directly led to reuse ethylene glycol receiving tank 5 to knockout tower 4, one tunnels, and knockout tower 4 Yi road output tubes lead to reuse ethylene glycol receiving tank 5; The pipeline 21 of virgin ethylene glycol is connected with the import of vaporizer 2, and the outlet of vaporizer 2 is connected with reuse ethylene glycol receiving tank 5, and reuse ethylene glycol receiving tank 5 is connected with the import of slurry preparation 6,
Pipeline between the outlet of vaporizer 2 and reuse ethylene glycol receiving tank 5 is provided with First Heat Exchanger 71, and the pipeline 21 of virgin ethylene glycol is by entering into after First Heat Exchanger 71 in vaporizer 2;
Pipeline between the outlet of knockout tower 4 and reuse ethylene glycol receiving tank 5 is provided with the second interchanger 72, and ethylene glycol low spot receiving tank 3 leads to the pipeline of knockout tower 4 also by this second interchanger 72.
Between first outlet of ethylene glycol liquid seal trough 11 and the import of knockout tower, be connected with the first pipe 91, this first pipe 91 is provided with the first valve 91a.When ethylene glycol low spot receiving tank liquid level, Gao Shizai enables ethylene glycol transferpump 31, with brownout.The first pipe 91 passes through to be connected with the import of knockout tower 4 after the second interchanger 72.
Between the import of the outlet of the second ethylene glycol liquid seal trough 12 and the first ethylene glycol liquid seal trough 11, be connected with the second pipe 92, this second pipe 92 is provided with the second valve 92a.Reduce the water content of EG in the first liquid seal trough 11, improved the vacuum state of the first Prepolycondensating reactor system, reduced the load of liquid-ring vacuum pump.
Between the outlet of triethylene glycol liquid seal trough 13 and slurry preparation 6, be connected with the 3rd pipe 93, the 3rd pipe 93 is provided with the 3rd valve, between the outlet of TEG liquid seal trough 14 and slurry preparation 6, be connected with the 4th pipe 94, the 4th pipe is provided with the 4th valve, in the present embodiment, the 3rd valve and the 4th valve share a valve 93a.By this kind of design improvement, reduce the electric power energy waste and the mechanical means loss that cause extra increase because of EG unnecessary circulation in system.
Bring up to the EG of knockout tower and join the temperature of fresh EG of each vaporizer, reduce knockout tower and the each vaporizer EG temperature to reuse ethylene glycol receiving tank, the density of EG and the stability of flow are improved, and have effectively avoided the unstable of operation, simultaneously, take full advantage of the waste heat in device, play reduction energy consumption, the effect of save energy, and, can reduce the tail gas amount of carrying secretly of slurry preparation groove, reduce the unit consumption of raw material.
Claims (5)
1. an improved ethylene glycol production combination device, comprises the first ethylene glycol liquid seal trough, the second ethylene glycol liquid seal trough, triethylene glycol liquid seal trough, TEG liquid seal trough, vaporizer, ethylene glycol low spot receiving tank, knockout tower, reuse ethylene glycol receiving tank and slurry preparation;
Aforesaid the first ethylene glycol liquid seal trough, the second ethylene glycol liquid seal trough are all connected with the import of ethylene glycol low spot receiving tank, and the output tube by is separately connected with plate-type heat exchanger separately respectively;
Aforesaid triethylene glycol liquid seal trough is connected with the import of reuse ethylene glycol receiving tank by branch line separately respectively with TEG liquid seal trough, and triethylene glycol liquid seal trough and TEG liquid seal trough another branch line by is separately connected with plate-type heat exchanger separately;
The output tube a-road-through of aforesaid ethylene glycol low spot receiving tank is to knockout tower, and a-road-through is to reuse ethylene glycol receiving tank, and knockout tower Yi road output tube leads to reuse ethylene glycol receiving tank;
The pipeline of virgin ethylene glycol is connected with the import of vaporizer, and the outlet of vaporizer is connected with reuse ethylene glycol receiving tank, and reuse ethylene glycol receiving tank is connected with the import of slurry preparation,
It is characterized in that
Pipeline between the outlet of described vaporizer and reuse ethylene glycol receiving tank is provided with First Heat Exchanger, and the pipeline of virgin ethylene glycol is by entering in vaporizer after aforesaid First Heat Exchanger;
Pipeline between the outlet of described knockout tower and reuse ethylene glycol receiving tank is provided with the second interchanger, and ethylene glycol low spot receiving tank leads to the pipeline of knockout tower also by this second interchanger.
2. improved ethylene glycol production combination device according to claim 1, is characterized in that being connected with the first pipe between described first outlet of ethylene glycol liquid seal trough and the import of knockout tower, and this first pipe is provided with the first valve.
3. improved ethylene glycol production combination device according to claim 2, is characterized in that the first described pipe is connected with the import of knockout tower by after the second interchanger.
4. improved ethylene glycol production combination device according to claim 1, is characterized in that being connected with the second pipe between the outlet of described the second ethylene glycol liquid seal trough and the import of the first ethylene glycol liquid seal trough, and this second pipe is provided with the second valve.
5. improved ethylene glycol production combination device according to claim 1, it is characterized in that being connected with the 3rd pipe between the outlet of described triethylene glycol liquid seal trough and slurry preparation, the 3rd pipe is provided with the 3rd valve, between the outlet of described TEG liquid seal trough and slurry preparation, be connected with the 4th pipe, the 4th pipe is provided with the 4th valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310299671.8A CN103360211B (en) | 2013-07-17 | 2013-07-17 | Improved ethylene glycol production system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310299671.8A CN103360211B (en) | 2013-07-17 | 2013-07-17 | Improved ethylene glycol production system |
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| CN103360211A CN103360211A (en) | 2013-10-23 |
| CN103360211B true CN103360211B (en) | 2014-10-15 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1583821A (en) * | 2004-06-02 | 2005-02-23 | 中国纺织工业设计院 | Efficient, simple and continuous process and apparatus for production of polyethylene glycol terephthalate |
| CN101581514A (en) * | 2009-05-31 | 2009-11-18 | 中国纺织工业设计院 | Method and device of exhaust steam refrigeration by utilizing polyester technology |
| CN102432848A (en) * | 2011-09-08 | 2012-05-02 | 浙江恒逸聚合物有限公司 | Slurry preparation method for producing polyester and system thereof |
| CN202297440U (en) * | 2011-09-08 | 2012-07-04 | 中国石油天然气集团公司 | Continuous production system of polytrimethylene terephthalate |
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2013
- 2013-07-17 CN CN201310299671.8A patent/CN103360211B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1583821A (en) * | 2004-06-02 | 2005-02-23 | 中国纺织工业设计院 | Efficient, simple and continuous process and apparatus for production of polyethylene glycol terephthalate |
| CN101581514A (en) * | 2009-05-31 | 2009-11-18 | 中国纺织工业设计院 | Method and device of exhaust steam refrigeration by utilizing polyester technology |
| CN102432848A (en) * | 2011-09-08 | 2012-05-02 | 浙江恒逸聚合物有限公司 | Slurry preparation method for producing polyester and system thereof |
| CN202297440U (en) * | 2011-09-08 | 2012-07-04 | 中国石油天然气集团公司 | Continuous production system of polytrimethylene terephthalate |
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| CN103360211A (en) | 2013-10-23 |
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Effective date of registration: 20190213 Address after: 314415 No. 15 Wenlan Road, Jianshan New District, Haining City, Zhejiang Province Patentee after: Zhejiang Wankai New Materials Co., Ltd. Address before: 314415 No. 15 Wenlan Road, Jianshan New District, Haining City, Zhejiang Province Co-patentee before: Zhejiang Suntext Fiber Co., Ltd. Patentee before: Zhejiang Wankai New Materials Co., Ltd. |
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Address after: 314415 Zhejiang province Haining city Jianshan District Road No. 15 Wen Patentee after: Wankai new materials Co., Ltd Address before: 314415 Zhejiang province Haining city Jianshan District Road No. 15 Wen Patentee before: ZHEJIANG WANKAI NEW MATERIALS Co.,Ltd. |
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