CN211411046U - Polyester grade alcohols product separator in ester exchange method dimethyl carbonate production - Google Patents
Polyester grade alcohols product separator in ester exchange method dimethyl carbonate production Download PDFInfo
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- CN211411046U CN211411046U CN201922073896.7U CN201922073896U CN211411046U CN 211411046 U CN211411046 U CN 211411046U CN 201922073896 U CN201922073896 U CN 201922073896U CN 211411046 U CN211411046 U CN 211411046U
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Abstract
A polyester grade alcohol product separation device in dimethyl carbonate production by a transesterification method comprises a dividing wall tower (1), a tower top condenser (2), a tower top reflux tank (3), a tower top reflux pump (4), a vacuum pump (5), a tower kettle reboiler (6) and a tower kettle product pump (7). The utility model relates to a separator of polyester grade alcohols product in ester exchange method dimethyl carbonate production uses dividing wall tower to replace original two tower settings to carry out the product separation, and dividing wall tower division board one side is the raw materials import, and the division board opposite side is the product and adopts the export. The use of the dividing wall tower ensures that the quality of the 1, 2-propylene glycol/ethylene glycol product is maintained at a polyester level, the investment of the device is reduced, and the energy consumption is reduced.
Description
Technical Field
The utility model provides a polyester grade alcohol product separator in ester exchange method dimethyl carbonate production is applicable to the technology that uses methyl alcohol and propylene carbonate ethylene carbonate as the raw materials, produces dimethyl carbonate and polyester grade 1, 2-propylene glycol ethylene glycol.
Background
1, 2-propylene glycol/ethylene glycol is an important raw material for producing polyester, and the quality of the 1, 2-propylene glycol/ethylene glycol directly influences the production stability and the product quality of the polyester. In the production of dimethyl carbonate by ester exchange method, single-tower operation is generally adopted, industrial grade 1, 2-propylene glycol/ethylene glycol products are extracted from the side line, the purity of the 1, 2-propylene glycol/ethylene glycol products is about 99.5%, and the requirement of polyester grade products with the distance of more than or equal to 99.9% has larger difference. In order to meet the requirements of polyester-grade products, the 1, 2-propylene glycol/ethylene glycol product tower is changed into a double-tower combination of a light component removal tower and a heavy component removal tower from single-tower side line extraction, the light component removal tower removes light components in the products, the heavy component removal tower removes heavy components in the products, and then the polyester-grade products with the purity of more than or equal to 99.9 percent are obtained. The double-tower process has large investment and high energy consumption.
The dividing wall column is a single-shell thermally coupled rectifying column, has great advantages for multicomponent rectification, and has less investment and low energy consumption compared with the conventional rectification. The dividing wall tower separates the tower sections at the feeding side and the extraction side by using the partition plate, and the use of the partition plate realizes the function of double towers, so that a high-purity side product can be obtained. The 1, 2-propylene glycol/ethylene glycol crude intermediate product produced by dimethyl carbonate through the ester exchange method adopts 1 dividing wall tower to replace a double tower for product separation, so that the polyester grade 1, 2-propylene glycol/ethylene glycol product can be obtained, the process flow is shortened, one tower, one condenser and one reboiler are omitted, the public engineering consumption can be reduced by more than 20%, the total investment can be reduced by about 30%, and the occupied area can be reduced by about 35%.
Disclosure of Invention
The utility model aims at providing a polyester level alcohols product separator in ester exchange method dimethyl carbonate production, the 1, 2-propylene glycol ethylene glycol intermediate product of producing obtains polyester level 1, 2-propylene glycol ethylene glycol product through the separation of 1 room wall tower, and process flow is simple, and the small investment, energy consumption are low.
In order to realize the purpose, the technical scheme adopted by the utility model is a polyester grade alcohol product separation device in the production of dimethyl carbonate by ester exchange method, which comprises a dividing wall tower (1), a tower top condenser (2), a tower top reflux tank (3), a tower top reflux pump (4), a vacuum pump (5), a tower kettle reboiler (6) and a tower kettle product pump (7); a gas phase outlet at the top of the dividing wall tower (1) is connected with a gas phase inlet of a tower top condenser (2), a liquid phase outlet of the tower top condenser (2) is connected with an inlet of a tower top reflux tank (3), an outlet at the bottom of the tower top reflux tank (3) is connected with an inlet of a tower top reflux pump (4), an outlet pipeline of the tower top reflux pump (4) is divided into two paths, one path is a tower top reflux pipeline communicated with the top of the dividing wall tower (1), the other path is a tower top light component product extraction pipeline, an inlet of a vacuum pump (5) is connected with a gas phase outlet of the tower top reflux tank (3), an outlet of the vacuum pump (5) enters a tail gas treatment system, an inlet of a tower kettle reboiler (6) is connected with the bottom of the dividing wall tower (1), an outlet of the tower kettle reboiler (6) is connected with the lower part of the dividing wall tower (1), an inlet of the tower kettle product pump (7) is connected with a bottom outlet of the, the dividing wall tower (1) is internally provided with a vertical dividing plate (8), one side of the dividing plate (8) is a raw material inlet, and the other side of the dividing plate is a polyester grade propylene glycol/ethylene glycol product outlet. The intermediate product containing propylene glycol/ethylene glycol enters the left side of the dividing wall tower for pre-separation, a light component product is obtained at the tower top, a heavy component product is obtained at the tower bottom, and a polyester-grade 1, 2-propylene glycol/ethylene glycol product is obtained at the right lateral line of the partition plate.
The utility model has the advantages that: compared with a light component removal and heavy component removal tower double-tower device, the dividing wall tower separating device can reduce one tower, one set of tower top condensing system and one set of tower kettle reboiler system, and has the advantages of simple flow, low investment cost and low energy consumption.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Reference numerals: 1 dividing wall tower, 2 overhead condensers, 3 overhead reflux tanks, 4 overhead reflux pumps, 5 vacuum pumps, 6 tower kettle reboilers, 7 tower kettle product pumps and 8 partition plates.
Detailed Description
As shown in fig. 1, a separation device for polyester grade alcohol products in dimethyl carbonate production by ester exchange method comprises a dividing wall tower (1), a tower top condenser (2), a tower top reflux tank (3), a tower top reflux pump (4), a vacuum pump (5), a tower bottom reboiler (6) and a tower bottom product pump (7); a gas phase outlet at the top of the dividing wall tower (1) is connected with a gas phase inlet of a tower top condenser (2), a liquid phase outlet of the tower top condenser (2) is connected with an inlet of a tower top reflux tank (3), an outlet at the bottom of the tower top reflux tank (3) is connected with an inlet of a tower top reflux pump (4), an outlet pipeline of the tower top reflux pump (4) is divided into two paths, one path is a tower top reflux pipeline communicated with the top of the dividing wall tower (1), the other path is a tower top light component product extraction pipeline, an inlet of a vacuum pump (5) is connected with a gas phase outlet of the tower top reflux tank (3), an outlet of the vacuum pump (5) enters a tail gas treatment system, an inlet of a tower kettle reboiler (6) is connected with the bottom of the dividing wall tower (1), an outlet of the tower kettle reboiler (6) is connected with the lower part of the dividing wall tower (1), an inlet of the tower kettle product pump (7) is connected with a bottom outlet of the, the dividing wall tower (1) is internally provided with a vertical dividing plate (8), one side of the dividing plate (8) is a raw material inlet, and the other side of the dividing plate is a polyester grade propylene glycol/ethylene glycol product outlet. The intermediate product containing propylene glycol/ethylene glycol enters the left side of the dividing wall tower for pre-separation, a light component product is obtained at the tower top, a heavy component product is obtained at the tower bottom, and a polyester-grade 1, 2-propylene glycol/ethylene glycol product is obtained at the right lateral line of the partition plate.
In the technical scheme of the embodiment, when an annual production 20000 tons of dimethyl carbonate production devices by ester exchange method are tested, a feed pipeline of the original double-tower combination is connected to a feed port on one side of a partition plate of a new dividing wall tower, and a side line is led out from the middle part of the other side of the partition plate of the dividing wall tower to obtain a product. The condenser and reflux system on the top of the tower are connected with the related pipeline of the dividing wall tower, the extraction system at the bottom of the tower and the reboiler are connected with the related pipeline of the dividing wall tower, and the original vacuum pumping system is used. The experimental result after the device is operated shows that: the extracted glycol product meets the requirement of polyester-grade products, the product quality is not reduced compared with that of the product produced by double towers before modification, and meanwhile, the energy consumption is reduced by 20 percent.
Above-mentioned embodiment is only the utility model provides a polyester grade alcohols product separation device realizes the form in ester exchange method dimethyl carbonate production, according to the utility model provides an other deformations of scheme increase or reduce composition or step wherein, perhaps will the utility model is used for other with the utility model discloses the technical field who is close all belongs to the utility model discloses a protection scope.
Claims (1)
1. A polyester grade alcohol product separation device in dimethyl carbonate production by ester exchange method comprises a dividing wall tower (1), a tower top condenser (2), a tower top reflux tank (3), a tower top reflux pump (4), a vacuum pump (5), a tower kettle reboiler (6) and a tower kettle product pump (7); the method is characterized in that: a gas phase outlet at the top of the dividing wall tower (1) is connected with a gas phase inlet of a tower top condenser (2), a liquid phase outlet of the tower top condenser (2) is connected with an inlet of a tower top reflux tank (3), an outlet at the bottom of the tower top reflux tank (3) is connected with an inlet of a tower top reflux pump (4), an outlet pipeline of the tower top reflux pump (4) is divided into two paths, one path is a tower top reflux pipeline communicated with the top of the dividing wall tower (1), the other path is a tower top light component product extraction pipeline, an inlet of a vacuum pump (5) is connected with a gas phase outlet of the tower top reflux tank (3), an outlet of the vacuum pump (5) enters a tail gas treatment system, an inlet of a tower kettle reboiler (6) is connected with the bottom of the dividing wall tower (1), an outlet of the tower kettle reboiler (6) is connected with the lower part of the dividing wall tower (1), an inlet of the tower kettle product pump (7) is connected with a bottom outlet of the, the dividing wall tower (1) is internally provided with a vertical dividing plate (8), one side of the dividing plate (8) is a raw material inlet, and the other side of the dividing plate is a polyester grade propylene glycol/ethylene glycol product outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922073896.7U CN211411046U (en) | 2019-11-27 | 2019-11-27 | Polyester grade alcohols product separator in ester exchange method dimethyl carbonate production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922073896.7U CN211411046U (en) | 2019-11-27 | 2019-11-27 | Polyester grade alcohols product separator in ester exchange method dimethyl carbonate production |
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| CN211411046U true CN211411046U (en) | 2020-09-04 |
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| CN201922073896.7U Active CN211411046U (en) | 2019-11-27 | 2019-11-27 | Polyester grade alcohols product separator in ester exchange method dimethyl carbonate production |
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Effective date of registration: 20220428 Address after: 063000 No. 905-1, 3rd floor, junxinli Central Plaza, Lubei District, Tangshan City, Hebei Province Patentee after: Tangshan good reputation Technology Development Co.,Ltd. Address before: 063000 905, business building, Central Plaza, Tangshan City, Hebei Province Patentee before: Qu Qianghao |