CN114573414A - Device and method for removing light components in styrene monomer - Google Patents
Device and method for removing light components in styrene monomer Download PDFInfo
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- CN114573414A CN114573414A CN202011382980.8A CN202011382980A CN114573414A CN 114573414 A CN114573414 A CN 114573414A CN 202011382980 A CN202011382980 A CN 202011382980A CN 114573414 A CN114573414 A CN 114573414A
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- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 137
- 238000010992 reflux Methods 0.000 claims abstract description 38
- 238000000926 separation method Methods 0.000 claims abstract description 36
- WRMNZCZEMHIOCP-UHFFFAOYSA-N 2-phenylethanol Chemical compound OCCC1=CC=CC=C1 WRMNZCZEMHIOCP-UHFFFAOYSA-N 0.000 claims description 24
- 239000012530 fluid Substances 0.000 claims description 24
- 238000006297 dehydration reaction Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000002351 wastewater Substances 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 3
- 235000013305 food Nutrition 0.000 description 8
- 239000000047 product Substances 0.000 description 6
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 3
- 239000012224 working solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- VEFXTGTZJOWDOF-UHFFFAOYSA-N benzene;hydrate Chemical compound O.C1=CC=CC=C1 VEFXTGTZJOWDOF-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 235000008446 instant noodles Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
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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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- Oil, Petroleum & Natural Gas (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention belongs to the field of styrene refining, and relates to a device and a method for removing light components in a styrene monomer. The device comprises a styrene lightness-removing rectifying tower, a tower top condenser, a tower top reflux tank, an ejector, an intermediate heat exchanger, a liquid ring vacuum pump and a gas-liquid separation tank. The device and the method for removing the light components in the styrene monomer can effectively solve the problems of light component removal and discharge and can reduce the polymerization of styrene. Compared with a single liquid ring vacuum pump system, the vacuum pump system has the advantages of high vacuum degree, low equipment investment, no light component enrichment and the like; compared with a multi-stage ejector system, the multi-stage ejector system has the advantages of low operation cost, low energy consumption, low wastewater amount, low working temperature and the like.
Description
Technical Field
The invention belongs to the field of styrene refining, and particularly relates to a device and a method for removing light components in a styrene monomer.
Background
The dehydration of phenethyl alcohol is an important process for the production of styrene, and is an important component of the process for coproducing propylene oxide and styrene (PO/SM).
In the PO/SM process, a product at the outlet of a phenethyl alcohol dehydration reactor is subjected to multi-stage refining and various impurities are removed, so that a high-purity styrene product can be obtained. One of the impurities is micromolecular aldehyde, and belongs to light components needing to be removed.
Styrene is easy to generate polymerization reaction at a higher temperature, and further causes the problems of equipment and pipeline blockage and the like, so the process of removing light components from the styrene is generally carried out in a negative pressure rectifying tower, and the separated light components can enter a vacuum system of the tower.
There are two types of conventional vacuum equipment: the advantages and disadvantages of two vacuum systems are shown in table 1, when the steam ejector and the liquid ring vacuum pump are applied to the styrene lightness-removing rectifying tower.
TABLE 1 advantages and disadvantages of two vacuum systems in the application of rectification column for removing light components from styrene
In practical application, the biggest problem of the steam jet is the polymerization of styrene, and because the polymerization of styrene is accelerated when the styrene in the tail gas is heated to 80-100 ℃ by steam, related pipelines and equipment need to be cleaned frequently, and safety risks exist.
The biggest problem of the liquid ring vacuum pump in practical application is the selection of the working liquid. The working liquid of the liquid ring vacuum pump is generally selected from nontoxic harmless inert liquid, such as water; or the substance same as or similar to the system medium, in the phenylethanol dehydration process, phenylethanol or ethylbenzene is often selected as the working fluid of the liquid ring vacuum pump. And the working fluid flows between the liquid ring vacuum pump and the gas-liquid separation tank in a closed circulation mode, and only a small amount of tail gas substances which are discharged and dissolved in the working fluid are supplemented.
In a styrene light component removal rectifying tower system, water or ethylbenzene is used as a working solution, so that the problem that the vacuum degree is insufficient and the requirement of a light component removal rectifying tower cannot be met is solved; the problem that the phenethyl alcohol is used as a working solution is that a part of light components can be accumulated in a rectification system in a large amount, because the externally discharged phenethyl alcohol can not be discarded at will and needs to return to a rectification tower, so that a part of light components can not be discharged in a short period and are enriched in the tower system.
Therefore, it is urgent to provide a method for removing light components from styrene monomer, which can not only effectively reduce the polymerization of styrene, but also achieve high vacuum degree, and simultaneously solve the problem of light component discharge.
Disclosure of Invention
The first purpose of the invention is to provide a device for removing light components in styrene monomers, which solves the technical problems of styrene polymerization, insufficient vacuum degree and the like of a styrene light component removal rectifying tower in the prior art.
In order to achieve the aim, the invention provides a device for removing light components in a styrene monomer, which comprises a styrene light component removal rectifying tower, a tower top condenser, a tower top reflux tank, an ejector, an intermediate heat exchanger, a liquid ring vacuum pump and a gas-liquid separation tank; wherein the content of the first and second substances,
the styrene light component removal rectifying tower comprises a first inlet of the styrene light component removal rectifying tower, a second inlet of the styrene light component removal rectifying tower and an outlet of the styrene light component removal rectifying tower positioned at the top, wherein the first inlet of the styrene light component removal rectifying tower is used for conveying a product of a phenylethanol dehydration reaction into the styrene light component removal rectifying tower; the outlet of the styrene lightness-removing rectifying tower is connected with the inlet of the tower top condenser;
the tower top reflux tank comprises an inlet of the tower top reflux tank, a first outlet of the tower top reflux tank positioned at the bottom and a second outlet of the tower top reflux tank positioned at the top, the inlet of the tower top reflux tank is connected with an outlet of the tower top condenser, the first outlet of the tower top reflux tank is connected with the second inlet of the styrene light component removal rectifying tower, and the second outlet of the tower top reflux tank is connected with the first inlet of the ejector;
an outlet of the ejector is connected with a first inlet of the liquid ring vacuum pump through the intermediate heat exchanger, and an outlet of the liquid ring vacuum pump is connected with an inlet of the gas-liquid separation tank; the liquid ring vacuum pump also comprises a second inlet of the liquid ring vacuum pump, and the second inlet is used for inputting liquid ring working liquid;
the knockout drum includes a first outlet of the knockout drum located at the top and a second outlet of the knockout drum located at the bottom.
According to a preferred embodiment of the present invention, the knock-out pot further comprises a third outlet of the knock-out pot at the bottom.
According to a preferred embodiment of the present invention, the apparatus further comprises a working fluid cooler, an inlet of the working fluid cooler is connected to the third outlet of the gas-liquid separation tank, and an outlet of the working fluid cooler is connected to the second inlet of the liquid ring vacuum pump.
According to a preferred embodiment of the invention, the intermediate heat exchanger is a vertical shell-and-tube heat exchanger.
The second purpose of the invention is to provide a method for removing light components in styrene monomer, which can effectively reduce the polymerization of styrene, can achieve very high vacuum degree and simultaneously solve the problem of light component discharge.
In order to achieve the above object, the present invention provides a method for removing light components from styrene monomer, which is carried out in the above apparatus, comprising the steps of:
(1) the product of the phenylethanol dehydration reaction enters a styrene light component removal rectifying tower from a first inlet of the styrene light component removal rectifying tower;
(2) the tail gas at the top of the tower containing light components and a small amount of styrene enters a condenser at the top of the tower from an outlet of a rectification tower for removing light components of the styrene, most of the tail gas is condensed into liquid, and the light components are still gas;
(3) liquid and gas at the outlet of the tower top condenser enter a tower top reflux tank, the liquid returns to the styrene lightness-removing rectifying tower from a first outlet of the tower top reflux tank through a second inlet of the styrene lightness-removing rectifying tower, and the gas is discharged from a second outlet of the tower top reflux tank;
(4) the light component gas discharged from the second outlet of the tower top reflux tank is taken as injection gas and is pumped into the ejector through the first inlet of the ejector;
(5) the working gas of the ejector enters the ejector through the second inlet of the ejector, the working gas of the ejector and the light component gas enter the intermediate heat exchanger together, are cooled and cooled, and then are sucked into the liquid ring vacuum pump through the first inlet of the liquid ring vacuum pump and are mixed with the liquid ring working fluid entering the liquid ring vacuum pump through the second inlet of the liquid ring vacuum pump;
(6) and the material flow flowing out of the outlet of the liquid ring vacuum pump enters the gas-liquid separation tank, the discharged tail gas is discharged from the first outlet of the gas-liquid separation tank, and the discharged working liquid is discharged from the second outlet of the gas-liquid separation tank. In the gas-liquid separation tank, part of light components are dissolved in the discharged working fluid and follow the discharged working fluid discharge device, and the rest light components are discharged from the discharged tail gas discharge device.
According to a preferred embodiment of the invention, the ejector process gas is steam.
According to a preferred embodiment of the present invention, the liquid ring working fluid is water.
According to a preferred embodiment of the invention, the intermediate heat exchanger is a vertical shell-and-tube heat exchanger, the outlet gas of the ejector enters the tube side of the intermediate heat exchanger, and the tube side is a single pass.
According to a preferred embodiment of the present invention, the method further comprises the steps of: in the gas-liquid separation tank, the discharged tail gas is discharged from a first outlet of the gas-liquid separation tank, part of discharged working liquid is discharged from a second outlet of the gas-liquid separation tank, and the other part of discharged working liquid is taken as circulating working liquid, discharged from a third outlet at the bottom of the gas-liquid separation tank and returned to the liquid ring vacuum pump.
According to a preferred embodiment of the present invention, the circulating working fluid is returned from a third outlet of the gas-liquid separation tank at the bottom to the liquid ring vacuum pump through the working fluid cooler.
The device and the method for removing the light components in the styrene monomer provided by the invention have the advantages that the ejector and the liquid ring vacuum pump are connected in series to form a brand-new vacuum system of the styrene light component removal rectifying tower, and the device and the method have the following advantages:
1) the liquid ring vacuum pump selects water as liquid ring working liquid, and the whole vacuum system can also reach enough vacuum degree;
2) the light components are easy to dissolve in water, and the aim of removing the light components can be fulfilled by continuously discharging the working solution and supplementing fresh water without accumulation of the light components;
3) the introduction of the single-stage ejector can reduce the load of the liquid ring vacuum pump and reduce the overall investment cost;
4) compared with a multi-stage ejector system, the method has the advantages of low energy consumption and low wastewater quantity;
5) the intermediate heat exchanger adopts a one-way shell-and-tube heat exchange design, and can effectively reduce the polymerization of the styrene.
The device and the method for removing the light components in the styrene monomer can effectively solve the problems of light component removal and discharge and can reduce the polymerization of styrene. Compared with a single liquid ring vacuum pump system, the vacuum pump system has the advantages of high vacuum degree, low equipment investment, no light component enrichment and the like; compared with a multi-stage ejector system, the system has the advantages of low operation cost, low energy consumption, low wastewater amount, low working temperature and the like.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic diagram of an apparatus for removing light components from styrene monomer according to one embodiment of the present invention.
Fig. 2 shows a schematic diagram of an apparatus for removing light components from styrene monomer according to another embodiment of the present invention.
In the figure:
1-a styrene light component removal rectifying tower, 2-a tower top condenser, 3-a tower top reflux tank, 4-an ejector, 5-an intermediate heat exchanger, 6-a liquid ring vacuum pump, 7-a gas-liquid separation tank and 8-a working liquid cooler;
11-a first inlet of a styrene lightness-removing rectifying tower, 12-a second inlet of the styrene lightness-removing rectifying tower, 41-a first inlet of an ejector, 42-a second inlet of the ejector, 61-a first inlet of a liquid ring vacuum pump, 62-a second inlet of the liquid ring vacuum pump, 71-a first outlet of a gas-liquid separating tank, 72-a second outlet of the gas-liquid separating tank and 73-a third outlet of the gas-liquid separating tank;
a-phenylethanol dehydration reaction product, B-tower top tail gas, C-light component gas, D-ejector working gas, E-intercooler outlet stream, F-outflow stream from liquid ring vacuum pump outlet, G-exhaust tail gas, H-exhaust working liquid, J-cycle working liquid and K-liquid ring working liquid.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.
Example 1
As shown in fig. 1, the present embodiment provides an apparatus for removing light components from a styrene monomer, the apparatus includes a styrene light component removal rectification column 1, an overhead condenser 2, an overhead reflux tank 3, an ejector 4, an intermediate heat exchanger 5, a liquid ring vacuum pump 6, and a gas-liquid separation tank 7; wherein the content of the first and second substances,
the styrene light component removal rectifying tower 1 comprises a first inlet 11 of the styrene light component removal rectifying tower, a second inlet 12 of the styrene light component removal rectifying tower and an outlet of the styrene light component removal rectifying tower positioned at the top, wherein the first inlet 11 of the styrene light component removal rectifying tower is used for conveying a product of a phenylethanol dehydration reaction to the styrene light component removal rectifying tower 1; the outlet of the styrene lightness-removing rectifying tower is connected with the inlet of the tower top condenser 2;
the overhead reflux tank 3 comprises an inlet of the overhead reflux tank 3, a first outlet of the overhead reflux tank 3 positioned at the bottom and a second outlet of the overhead reflux tank 3 positioned at the top, the inlet of the overhead reflux tank 3 is connected with an outlet of the overhead condenser 2, the first outlet of the overhead reflux tank 3 is connected with the second inlet 12 of the styrene light component removal rectifying tower, and the second outlet of the overhead reflux tank 3 is connected with the first inlet 41 of the ejector;
the outlet of the ejector 4 is connected with a first inlet 61 of the liquid ring vacuum pump through the intermediate heat exchanger 5 (vertical shell-and-tube heat exchanger), and the outlet of the liquid ring vacuum pump 6 is connected with the inlet of the gas-liquid separation tank 7; the liquid ring vacuum pump 6 further comprises a second inlet 62 of the liquid ring vacuum pump, and is used for inputting liquid ring working fluid;
the knock-out pot 7 includes a first outlet 71 of the knock-out pot at the top and a second outlet 72 of the knock-out pot at the bottom.
As shown in fig. 1, this example provides a method for removing light components from styrene monomer, which is carried out in the above-mentioned apparatus, and comprises the following steps:
(1) a product A of the phenethyl alcohol dehydration reaction enters a styrene lightness-removing rectifying tower 1 from a first inlet 11 of the styrene lightness-removing rectifying tower;
(2) the tail gas B at the top of the tower containing light components and a small amount of styrene enters a condenser 2 at the top of the tower from an outlet of a rectification tower 1 for removing light components of styrene, most of the tail gas is condensed into liquid, and the light components are still gas;
(3) liquid and gas at the outlet of the tower top condenser 2 enter a tower top reflux tank 3, the liquid returns to the styrene lightness-removing rectifying tower 1 from a first outlet of the tower top reflux tank 3 through a second inlet 12 of the styrene lightness-removing rectifying tower, and the gas is discharged from a second outlet of the tower top reflux tank 3;
(4) the light component gas C discharged from the second outlet of the tower top reflux tank 3 is taken as injection gas and is pumped into the ejector 4 through the first inlet 41 of the ejector;
(5) the working gas D of the ejector enters the ejector 4 through the second inlet 42 of the ejector, the working gas D (steam) of the ejector and the light component gas C enter the tube side (single pass) of the intermediate heat exchanger 5 together, and are cooled, and then the material flow E at the outlet of the intermediate cooler is sucked into the liquid ring vacuum pump 6 through the first inlet 61 of the liquid ring vacuum pump and is mixed with the liquid ring working liquid K (water) entering the liquid ring vacuum pump 6 through the second inlet 62 of the liquid ring vacuum pump;
(6) and the material flow F flowing out of the outlet of the liquid ring vacuum pump enters the gas-liquid separation tank 7, the discharged tail gas G is discharged from a first outlet 71 of the gas-liquid separation tank, and the discharged working liquid H is discharged from a second outlet 72 of the gas-liquid separation tank.
Example 2
As shown in fig. 2, unlike the apparatus of example 1, in the apparatus for removing light components from styrene monomer provided in this example, an operating liquid cooler 8 is disposed between a liquid ring vacuum pump 6 and a gas-liquid separation tank 7, an inlet of the operating liquid cooler 8 is connected to a third outlet 73 of the gas-liquid separation tank, and an outlet of the operating liquid cooler 8 is connected to a second inlet 62 of the liquid ring vacuum pump.
Unlike the method in example 2, the method for removing light components from styrene monomer provided in this example further includes the following steps: in the gas-liquid separation tank 7, the exhaust gas G is discharged from a first outlet 71 of the gas-liquid separation tank, a part of the exhaust working fluid H is discharged from a second outlet 72 of the gas-liquid separation tank, and the other part of the exhaust working fluid H is discharged as a circulating working fluid J from a third outlet 73 of the gas-liquid separation tank, cooled by a working fluid cooler 8, and then returned to the liquid ring vacuum pump 6 via a second inlet 62 of the liquid ring vacuum pump.
Comparison of Performance parameters
The light component removal rate of the styrene lightness-removing rectifying column system of example 1 and example 2, the vacuum degree of the system and whether or not the styrene in the system is polymerized are compared with those of comparative example 1 (single liquid ring vacuum pump system) and comparative example 2 (single steam ejector system) in the following table 2.
TABLE 2
| Example 1 | Example 2 | Comparative example 1 | Comparative example 2 | |
| Light component removal rate | Superior food | Superior food | Difference (D) | Superior food |
| Degree of vacuum | Superior food | Superior food | Difference (D) | Superior food |
| Energy consumption | Youyou (an instant noodle) | Superior food | Superior food | Difference (D) |
| Amount of waste water | Multiple purpose | Chinese character shao (a Chinese character of 'shao') | - | Multiple purpose |
| Operating temperature | Is low in | Is low in | Is low in | Height of |
| Polymerization of styrene | A little bit | Chinese character shao (a Chinese character of 'shao') | Chinese character shao (a Chinese character of 'shao') | Multiple purpose |
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A device for removing light components in styrene monomers is characterized by comprising a styrene light component removal rectifying tower, a tower top condenser, a tower top reflux tank, an ejector, an intermediate heat exchanger, a liquid ring vacuum pump and a gas-liquid separation tank; wherein the content of the first and second substances,
the styrene light component removal rectifying tower comprises a first inlet of the styrene light component removal rectifying tower, a second inlet of the styrene light component removal rectifying tower and an outlet of the styrene light component removal rectifying tower positioned at the top, wherein the first inlet of the styrene light component removal rectifying tower is used for conveying a product of a phenylethanol dehydration reaction into the styrene light component removal rectifying tower; the outlet of the styrene lightness-removing rectifying tower is connected with the inlet of the tower top condenser;
the tower top reflux tank comprises an inlet of the tower top reflux tank, a first outlet of the tower top reflux tank positioned at the bottom and a second outlet of the tower top reflux tank positioned at the top, the inlet of the tower top reflux tank is connected with an outlet of the tower top condenser, the first outlet of the tower top reflux tank is connected with the second inlet of the styrene light component removal rectifying tower, and the second outlet of the tower top reflux tank is connected with the first inlet of the ejector;
an outlet of the ejector is connected with a first inlet of the liquid ring vacuum pump through the intermediate heat exchanger, and an outlet of the liquid ring vacuum pump is connected with an inlet of the gas-liquid separation tank; the liquid ring vacuum pump also comprises a second inlet of the liquid ring vacuum pump, and the second inlet is used for inputting liquid ring working liquid;
the knockout drum includes a first outlet of the knockout drum located at the top and a second outlet of the knockout drum located at the bottom.
2. The apparatus of claim 1, wherein the knockout drum further comprises a third outlet of the knockout drum at the bottom.
3. The apparatus of claim 2, further comprising a working fluid cooler, an inlet of the working fluid cooler being connected to the third outlet of the gas-liquid separation tank, and an outlet of the working fluid cooler being connected to the second inlet of the liquid ring vacuum pump.
4. The apparatus according to claim 1, wherein the intermediate heat exchanger is a vertical shell-and-tube heat exchanger.
5. A method for removing light components from styrene monomer, which is carried out in the device of any one of claims 1 to 4, comprising the steps of:
(1) the product of the phenylethanol dehydration reaction enters a styrene light component removal rectifying tower from a first inlet of the styrene light component removal rectifying tower;
(2) the tail gas at the top of the tower containing light components and a small amount of styrene enters a condenser at the top of the tower from an outlet of a rectification tower for removing light components of the styrene, most of the tail gas is condensed into liquid, and the light components are still gas;
(3) liquid and gas at the outlet of the tower top condenser enter a tower top reflux tank, the liquid returns to the styrene lightness-removing rectifying tower from a first outlet of the tower top reflux tank through a second inlet of the styrene lightness-removing rectifying tower, and the gas is discharged from a second outlet of the tower top reflux tank;
(4) the light component gas discharged from the second outlet of the tower top reflux tank is taken as injection gas and is pumped into the ejector through the first inlet of the ejector;
(5) the working gas of the ejector enters the ejector through the second inlet of the ejector, the working gas of the ejector and the light component gas enter the intermediate heat exchanger together, are cooled and cooled, and then are sucked into the liquid ring vacuum pump through the first inlet of the liquid ring vacuum pump and are mixed with the liquid ring working fluid entering the liquid ring vacuum pump through the second inlet of the liquid ring vacuum pump;
(6) and the material flow flowing out of the outlet of the liquid ring vacuum pump enters the gas-liquid separation tank, the discharged tail gas is discharged from the first outlet of the gas-liquid separation tank, and the discharged working liquid is discharged from the second outlet of the gas-liquid separation tank.
6. The method of claim 5, wherein the ejector working gas is steam.
7. The method of claim 5, wherein the liquid ring working fluid is water.
8. The process of claim 5, wherein the intermediate heat exchanger is a vertical shell and tube heat exchanger, the outlet gas of the ejector enters the tube side of the intermediate heat exchanger, and the tube side is a single pass.
9. The method of claim 5, further comprising the steps of: in the gas-liquid separation tank, the discharged tail gas is discharged from a first outlet of the gas-liquid separation tank, part of discharged working liquid is discharged from a second outlet of the gas-liquid separation tank, and the other part of discharged working liquid is taken as circulating working liquid, discharged from a third outlet at the bottom of the gas-liquid separation tank and returned to the liquid ring vacuum pump.
10. The method of claim 9, wherein the circulating working fluid is returned to the liquid ring vacuum pump from a third outlet at the bottom of the knock-out pot via a working fluid cooler.
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