CN215828661U - Ethylene carbonate device exhaust gas system material recovery unit - Google Patents
Ethylene carbonate device exhaust gas system material recovery unit Download PDFInfo
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- CN215828661U CN215828661U CN202121359322.7U CN202121359322U CN215828661U CN 215828661 U CN215828661 U CN 215828661U CN 202121359322 U CN202121359322 U CN 202121359322U CN 215828661 U CN215828661 U CN 215828661U
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Abstract
The utility model relates to a material recovery device of an ethylene carbonate device waste gas system. The technical scheme is as follows: the feed gas is connected to a gas-liquid separation tank through an air cooler and a water cooler, a liquid outlet at the lower end of the gas-liquid separation tank is connected to an ethylene carbonate delivery pump through a pipeline, a gas outlet at the upper end of the gas-liquid separation tank is connected to a heavy component removal rectifying tower through a feed gas compressor, the upper end of the heavy component removal rectifying tower is connected to a light component removal rectifying tower, the top of the light component removal rectifying tower is connected to a light component removal reflux tank through a light component removal condenser, and the middle outlet of the light component removal rectifying tower is connected to more than one group of activated carbon adsorbers; the beneficial effects are that: the utility model effectively separates the mixed non-condensable gas, and discharges the carbon dioxide after the separation; the ethylene oxide and the ethylene carbonate are separated, rectified, purified and returned to the device for recycling, so that the product yield of the device is increased, the material consumption of raw materials is reduced, and excellent environmental protection, safety and economic benefits are generated while the environmental protection and safety problems are solved.
Description
Technical Field
The utility model relates to a production device of ethylene carbonate, in particular to a material recovery device of an exhaust gas system of an ethylene carbonate device.
Background
Ethylene Carbonate (EC), which is an excellent polar high-boiling point solvent, a surfactant raw material and an organic synthesis intermediate, has been developed abroad to synthesize the furanfuranone, the dimethyl carbonate, the ethylene glycol and the functional polymer by taking the EC as the raw material, is used for modifying polymers and the like, is widely applied to the field of organic synthesis, and is a potential green organic chemical basic raw material. The ethylene carbonate can synthesize various fine chemicals through ester exchange reaction, is used for the fields of plastics, printing and dyeing, high polymer synthesis, gas separation, electrochemistry and the like, and has great market potential. The current mainstream industrial production process of ethylene carbonate is an ethylene oxide and carbon dioxide addition method, and since the process is industrialized in Germany in the last century, the process can be industrially produced on a large scale due to the advantages of low production cost, high conversion rate and selectivity, simple product separation and the like.
However, in the process of producing ethylene carbonate by the addition of ethylene oxide and carbon dioxide, process waste gas containing ethylene oxide, carbon dioxide and ethylene carbonate is generated, so that the environmental protection problem is generated, the raw material waste is caused, the environmental protection pressure is increased, and the product yield is reduced. The raw materials used by the production unit of the process are all low-boiling-point materials which are extremely easy to volatilize; the rectification unit needs negative pressure operation, and the vacuum unit also pumps out a large amount of non-condensable gas. The waste gas of the device brought by the method can not be ignored, particularly under the current increasingly strict environmental protection requirement and the development trend of green chemical industry, the recovery treatment of the waste gas of the device is very important, and the product yield of the device can be reduced due to the loss of the waste gas, so that the profit is influenced.
Among them, ethylene oxide is a flammable and explosive toxic carcinogen, which may cause environmental pollution and may cause safety problems; in the past, the ethylene oxide non-condensable gas can only be absorbed by water, so that a large amount of sewage is brought, and the sewage treatment load is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects in the prior art, and provides a material recovery device of a waste gas system of a ethylene carbonate device, which is used for separating waste gas and discharging carbon dioxide after separation to reach the standard; the ethylene oxide and the ethylene carbonate are separated, rectified and purified and returned to the device for reuse.
The utility model provides a material recovery device of a waste gas system of a ethylene carbonate device, which adopts the technical scheme that: comprises an air cooler (1), a water cooler (2), a gas-liquid separation tank (3), a feed gas compressor (4), a heavy-component removal rectifying tower (5), a light-component removal rectifying tower (6), a light-component removal reboiler (7), a light-component removal condenser (8), a light-component removal reflux tank (10), a light-component removal reflux pump (11), a vinyl carbonate delivery pump (13) and an active carbon adsorber (14), wherein the feed gas is connected to the gas-liquid separation tank (3) through the air cooler (1) and the water cooler (2), a liquid outlet at the lower end of the gas-liquid separation tank (3) is connected to the vinyl carbonate delivery pump (13) through a pipeline, an upper-end gas outlet of the gas-liquid separation tank (3) is connected with the heavy-component removal rectifying tower (5) through the feed gas compressor (4), the upper end of the heavy-component removal rectifying tower (5) is connected with the light-component removal rectifying tower (6) through a pipeline, the top of the light-component removal rectifying tower (6) is connected with the light-component removal reflux tank (10) through the light-component removal condenser (8), the bottom of the light component removal reflux tank (10) is connected to the upper side of the light component removal rectifying tower (6) through a light component removal reflux pump (11); the middle outlet of the light component removal rectifying tower (6) is connected with more than one group of activated carbon adsorbers (14); and a light component removal reboiler (7) is arranged at the bottom of the light component removal rectifying tower (6).
Preferably, the bottom of the light component removal rectifying tower (6) is connected to the upper side of the heavy component removal rectifying tower (5) through a pipeline and an ethylene oxide outward-feeding pump (12), and an ethylene oxide product liquid phase of the light component removal rectifying tower (6) is used as a cold source of the heavy component removal rectifying tower (5).
Preferably, the bottom of the heavy component removal and rectification tower (5) is connected to an ethylene carbonate delivery pump (13) through a pipeline, and the ethylene carbonate delivery pump (13) is used for conveying the ethylene carbonate to an ethylene carbonate refining unit.
Preferably, the condensing end of the lightness-removing condenser (8) is connected with a refrigerating unit (9).
Preferably, the heat source of the lightness-removing reboiler (7) is low-temperature hot water.
Preferably, the middle outlet of the light component removal rectifying tower (6) is connected with two groups of activated carbon adsorbers (14), ethylene oxide is adsorbed by activated carbon, and the activated carbon adsorbers (14) are respectively connected with steam pipelines with the pressure of more than 1.0 MPA.
The utility model has the beneficial effects that: the utility model effectively separates the mixed non-condensable gas of three substances generated in the process of producing the ethylene carbonate, and carbon dioxide harmless to the environment is discharged after separation; the ethylene oxide and the ethylene carbonate are separated, rectified, purified and returned to the device for recycling, most of the ethylene oxide is recycled, only a small part of the ethylene oxide passes through water absorption, the sewage generation amount is small, the sewage treatment pressure is greatly reduced, the environmental protection and safety problems are solved, the product yield of the device is increased, the raw material consumption is reduced, and excellent environmental protection, safety and economic benefits are generated.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the upper diagram: the system comprises an air cooler 1, a water cooler 2, a gas-liquid separation tank 3, a feed gas compressor 4, a heavy-component removal rectifying tower 5, a light-component removal rectifying tower 6, a light-component removal reboiler 7, a light-component removal condenser 8, a refrigerating unit 9, a light-component removal reflux tank 10, a light-component removal reflux pump 11, an ethylene oxide delivery pump 12, a ethylene carbonate delivery pump 13, an activated carbon adsorber 14, a feed gas a, 1.0MPA steam b, low-temperature hot water c, an ethylene carbonate refining unit d and an ethylene carbonate reaction unit e.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Embodiment 1, referring to fig. 1, the material recovery device of the waste gas system of the ethylene carbonate device, which is provided by the utility model, comprises an air cooler 1, a water cooler 2, a gas-liquid separation tank 3, a raw material gas compressor 4, a heavy component removal rectification tower 5, a light component removal rectification tower 6, a light component removal reboiler 7, a light component removal condenser 8, a light component removal reflux tank 10, a light component removal reflux pump 11, a ethylene carbonate delivery pump 13 and an activated carbon adsorber 14, wherein a raw material gas a is connected to the gas-liquid separation tank 3 through the air cooler 1 and the water cooler 2, a liquid outlet at the lower end of the gas-liquid separation tank 3 is connected to the ethylene carbonate delivery pump 13 through a pipeline, a gas outlet at the upper end of the gas-liquid separation tank 3 is connected to the heavy component removal rectification tower 5 through the raw material gas compressor 4, the upper end of the heavy component removal rectification tower 5 is connected to the light component removal rectification tower 6 through a pipeline, the top of the light component removal rectification tower 6 is connected to the light component removal reflux tank 10 through the light component removal condenser 8, the bottom of the lightness-removing reflux tank 10 is connected to the upper side of the lightness-removing rectifying tower 6 through a lightness-removing reflux pump 11; the middle outlet of the light component removal rectifying tower 6 is connected with more than one group of activated carbon adsorbers 14; and a light component removal reboiler 7 is arranged at the bottom of the light component removal rectifying tower 6.
Wherein, the bottom of the light component removal rectifying tower 6 is connected to the upper side of the heavy component removal rectifying tower 5 through a pipeline and an ethylene oxide delivery pump 12, and the ethylene oxide product liquid phase of the light component removal rectifying tower 6 is used as a cold source of the heavy component removal rectifying tower 5.
The bottom of the heavy component removal rectifying tower 5 is connected to an ethylene carbonate delivery pump 13 through a pipeline, and is conveyed to an ethylene carbonate refining unit d through the ethylene carbonate delivery pump 13; the condensing end of the lightness-removing condenser 8 is connected with a refrigerating unit 9, the heat source of the lightness-removing reboiler 7 is low-temperature hot water, the middle outlet of the lightness-removing rectifying tower 6 is connected with two groups of activated carbon adsorbers 14, ethylene oxide is adsorbed by activated carbon, and the activated carbon adsorbers 14 are respectively connected with 1.0MPA steam b.
The specific process flow is as follows: the raw material gas a containing the ethylene oxide, the carbon dioxide and the ethylene carbonate is initially cooled by an air cooler 1, then is cooled to 40-50 ℃ by a water cooler 2 (higher than 38 ℃ of the melting point of the ethylene carbonate), and most of the ethylene carbonate is condensed into a liquid phase and then is discharged from the bottom of a gas-liquid separation tank 3. At the temperature, gas components mainly comprise ethylene oxide and carbon dioxide, are discharged from the upper part of a gas-liquid separation tank 3, are compressed by a feed gas compressor 4, enter a de-heavy rectifying tower 5, are discharged from a tower kettle and are sent back to a ethylene carbonate rectifying unit d together with materials at the bottom of the gas-liquid separation tank through an ethylene carbonate delivery pump, wherein the materials have a boiling point higher than that of the ethylene oxide and mainly comprise residual ethylene carbonate; the gas phase at the top of the heavy component removal rectifying tower is mostly ethylene oxide and carbon dioxide, the ethylene oxide and the carbon dioxide enter a light component removal rectifying tower 6, the carbon dioxide gas with the purity of more than 99.99 percent is discharged from the top of the light component removal rectifying tower 6 through a light component removal condenser 8, wherein the ethylene oxide is less than or equal to 0.5P.P.M and is discharged after reaching the standard, the lower end of the light component removal condenser 8 is connected with a light component removal reflux tank 10, and the bottom of the light component removal reflux tank 10 is connected to the upper side of the light component removal rectifying tower 6 through a light component removal reflux pump 11; ethylene oxide with the purity of more than or equal to 99.97 percent is obtained at the bottom of the tower, part of the ethylene oxide is sent back to the ethylene carbonate production unit by an ethylene oxide external feeding pump 12, and part of the ethylene oxide is used as a tower top cold source of the heavy component removal rectifying tower and enters the heavy component removal rectifying tower 5. The side-sampling gas passes through an activated carbon adsorber 14 adsorption bed layer, the ethylene oxide is adsorbed by activated carbon, the adsorbers are used and prepared and connected with 1.0MPA steam b, the regeneration function can be realized, and the regenerated waste steam (liquid) is uniformly treated by an environment-friendly pool after being absorbed by water.
A reboiler is not arranged at the tower kettle of the heavy component removal rectifying tower 5, and high-temperature gas compressed by raw material gas is used as a heat source; the top 5 of the heavy component removal tower is not provided with a condenser, and the liquid phase of the ethylene oxide product is used as a cold source and is directly added from the top of the tower. The heat source of a light component removal reboiler at the bottom of the light component removal rectifying tower 6 is low-temperature hot water c, and the cold source of a light component removal condenser at the top of the tower is from a refrigerating unit 9.
The difference from the embodiment 1 is that: the bottom of the light component removal rectifying tower 6 is connected to the upper side of the heavy component removal rectifying tower 5 through a pipeline and an ethylene oxide external pump 12, and an ethylene oxide product liquid phase of the light component removal rectifying tower 6 is used as a cold source of the heavy component removal rectifying tower 5; in addition, the ethylene oxide delivery pump 12 also delivers the excess ethylene oxide to the ethylene carbonate reaction unit e through a pipeline, and recovers the ethylene carbonate involved in the reaction process.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solution described above. Therefore, any simple modifications or equivalent changes made according to the technical solution of the present invention shall fall within the scope of the present invention as claimed.
Claims (6)
1. The utility model provides a material recovery unit of ethylene carbonate device exhaust gas system which characterized by: comprises an air cooler (1), a water cooler (2), a gas-liquid separation tank (3), a feed gas compressor (4), a heavy-component removal rectifying tower (5), a light-component removal rectifying tower (6), a light-component removal reboiler (7), a light-component removal condenser (8), a light-component removal reflux tank (10), a light-component removal reflux pump (11), a vinyl carbonate delivery pump (13) and an active carbon adsorber (14), wherein the feed gas is connected to the gas-liquid separation tank (3) through the air cooler (1) and the water cooler (2), a liquid outlet at the lower end of the gas-liquid separation tank (3) is connected to the vinyl carbonate delivery pump (13) through a pipeline, an upper-end gas outlet of the gas-liquid separation tank (3) is connected with the heavy-component removal rectifying tower (5) through the feed gas compressor (4), the upper end of the heavy-component removal rectifying tower (5) is connected with the light-component removal rectifying tower (6) through a pipeline, the top of the light-component removal rectifying tower (6) is connected with the light-component removal reflux tank (10) through the light-component removal condenser (8), the bottom of the light component removal reflux tank (10) is connected to the upper side of the light component removal rectifying tower (6) through a light component removal reflux pump (11); the middle outlet of the light component removal rectifying tower (6) is connected with more than one group of activated carbon adsorbers (14); and a light component removal reboiler (7) is arranged at the bottom of the light component removal rectifying tower (6).
2. The material recovery device of the waste gas system of the ethylene carbonate device as claimed in claim 1, which is characterized in that: the bottom of the light component removal rectifying tower (6) is connected to the upper side of the heavy component removal rectifying tower (5) through a pipeline and an ethylene oxide delivery pump (12), and an ethylene oxide product liquid phase of the light component removal rectifying tower (6) is used as a cold source of the heavy component removal rectifying tower (5).
3. The material recovery device of the waste gas system of the ethylene carbonate device as claimed in claim 1, which is characterized in that: the bottom of the heavy component removal rectifying tower (5) is connected to an ethylene carbonate outward-feeding pump (13) through a pipeline, and the ethylene carbonate outward-feeding pump (13) conveys the ethylene carbonate to an ethylene carbonate refining unit.
4. The material recovery device of the waste gas system of the ethylene carbonate device as claimed in claim 1, which is characterized in that: the condensing end of the lightness-removing condenser (8) is connected with a refrigerating unit (9).
5. The material recovery device of the waste gas system of the ethylene carbonate device as claimed in claim 1, which is characterized in that: the heat source of the light component removal reboiler (7) is low-temperature hot water.
6. The material recovery device of the waste gas system of the ethylene carbonate device as claimed in claim 1, which is characterized in that: the middle outlet of the light component removal rectifying tower (6) is connected with two groups of activated carbon adsorbers (14), ethylene oxide is adsorbed by activated carbon, and the activated carbon adsorbers (14) are respectively connected with steam pipelines above 1.0 MPA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121359322.7U CN215828661U (en) | 2021-06-18 | 2021-06-18 | Ethylene carbonate device exhaust gas system material recovery unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121359322.7U CN215828661U (en) | 2021-06-18 | 2021-06-18 | Ethylene carbonate device exhaust gas system material recovery unit |
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| Publication Number | Publication Date |
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| CN215828661U true CN215828661U (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121359322.7U Active CN215828661U (en) | 2021-06-18 | 2021-06-18 | Ethylene carbonate device exhaust gas system material recovery unit |
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| CN (1) | CN215828661U (en) |
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2021
- 2021-06-18 CN CN202121359322.7U patent/CN215828661U/en active Active
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