CN116410047A - Method and device for producing ethylbenzene by ethylene gas-liquid phase method - Google Patents
Method and device for producing ethylbenzene by ethylene gas-liquid phase method Download PDFInfo
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- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 239000005977 Ethylene Substances 0.000 title claims abstract description 70
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000007791 liquid phase Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000005804 alkylation reaction Methods 0.000 claims abstract description 97
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000006243 chemical reaction Methods 0.000 claims abstract description 50
- 238000005194 fractionation Methods 0.000 claims abstract description 41
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 239000000376 reactant Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 238000010992 reflux Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 43
- 238000010521 absorption reaction Methods 0.000 description 13
- 239000012071 phase Substances 0.000 description 11
- 230000029936 alkylation Effects 0.000 description 10
- 239000002994 raw material Substances 0.000 description 10
- 230000002745 absorbent Effects 0.000 description 8
- 239000002250 absorbent Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 238000004821 distillation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000012295 chemical reaction liquid Substances 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011949 solid catalyst Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/54—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
- C07C2/64—Addition to a carbon atom of a six-membered aromatic ring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/009—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping in combination with chemical reactions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J10/00—Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/04—Pressure vessels, e.g. autoclaves
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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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- Chemical Kinetics & Catalysis (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method and a device for producing ethylbenzene by an ethylene gas-liquid phase method. The method is characterized in that: the method comprises the steps that an ethylene-rich gas and benzene stream are sent to an alkylation reaction device for alkylation reaction, a side-stream reactant stream discharged from a side stream is divided into two parts after heat exchange, one part of the side-stream reactant stream is returned to the alkylation reaction device, the other part of the side-stream reactant stream is sent to a separation reaction device, a product mixture from the top of the alkylation reaction device enters a fractionation device, the fractionated gas is cooled to separate liquid after heat recovery, condensate flows back to the fractionation device, noncondensable gas is sent to a tail gas treatment device, liquid phase effluent after fractionation comes out from the bottom of the fractionation device, one part of the liquid phase effluent is circulated to the top of the alkylation reaction device, the other part of the liquid phase effluent is sent to the separation reaction device, and ethylbenzene is obtained by the separation reaction device. The invention can utilize the reaction heat to carry out fractionation and has the advantages of environmental protection, energy saving, low investment cost, high ethylene conversion rate recovery rate and the like.
Description
Technical Field
The invention belongs to the field of petrochemical industry, and particularly relates to a method and a device for producing ethylbenzene by a gas-liquid phase alkylation reaction of ethylene.
Background
Ethylbenzene is a basic raw material for petrochemical industry, and is mainly used for producing styrene, so that plastic and synthetic rubber products are produced, and the downstream market demand is large, so that the production of raw material ethylbenzene is driven.
At present, ethylbenzene is mainly produced by alkylation reaction of pure ethylene and benzene, and is mainly classified into a gas phase method and a liquid phase method according to different phase states of the alkylation reaction. Compared with the gas phase method, the liquid phase method has the characteristics of mild reaction conditions, low energy consumption and material consumption and good product quality. However, the raw material ethylene of the liquid-phase method is usually polymer grade ethylene, and an ethylene production device with complicated flow and high investment is required, so that the economy of the technology for producing ethylbenzene by the pure ethylene liquid-phase method is limited.
With the development of petroleum refining industry in China, a plurality of refinery tail gases containing ethylene become a new source of ethylene. Therefore, aiming at the problem of limited economy in the liquid phase method, the development of the production technology for preparing the ethylbenzene by the dry gas-liquid phase method has important significance.
Chinese patent CN102267859a discloses a technology for producing ethylbenzene from ethylene, which is a gas mixture containing ethylene and inert components, divided into N parts, and introduced into the bottom of the nth absorption section of an alkylation reactor through a gas phase inlet, respectively, by a pipeline, and contacted with an absorbent from an absorbent inlet at the top of the alkylation reactor in the absorption section; the alkylation reactor is provided with N absorption sections and N reaction sections, and the mass content of ethylbenzene and polyethylbenzene in the absorbent is 30-90%; the absorbent absorbing ethylene flows downwards, ethylbenzene and polyethylbenzene are generated in the reaction section, the absorbent sequentially passes through each absorption section and the reaction section in an alkylation reactor, and the reacted gas phase and liquid phase hydrocarbonated liquid is sent to the subsequent section. The technology is characterized in that raw material gas is divided into a plurality of feeding materials, the feeding materials enter an absorption section in a tower, and after ethylene is fully absorbed by liquid benzene, the liquid benzene enters a reaction section to carry out liquid phase alkylation reaction.
Chinese patent CN107827692a discloses a technology for producing ethylbenzene from high-concentration ethylene gas, which divides raw material concentrated ethylene dry gas into a plurality of strands and correspondingly enters a plurality of absorption towers; the first absorption tower additionally provides raw material benzene as an absorbent; the gas phase material from the absorption tower enters a gas phase alkylation reactor for treatment; the liquid material enters a liquid phase alkylation reactor for reaction; the discharged material after the liquid phase alkylation reaction is divided into two parts, wherein the first part of material returns to the primary absorption tower to be used as an absorbent, and the second part of material enters the next absorption tower to be used as an absorbent; one strand of the material formed after the stranding reaction returns to the last absorption tower, and the other strand enters the benzene recovery tower; the material rich in ethylbenzene is extracted in the benzene recovery tower and enters the ethylbenzene recovery tower to form ethylbenzene distillate. The technology is characterized in that raw material gas firstly enters an absorption tower, and after full absorption, gas and liquid phases respectively enter a gas phase alkylation reactor and a liquid phase alkylation reactor to react.
However, the techniques of the two patents do not fully utilize the heat generated by alkylation reaction and have complex equipment flow.
Chinese patent CN1150142C discloses a process and apparatus for preparing ethylbenzene by alkylation of benzene and refinery dry gas by catalytic distillation, which comprises a step of pretreating the refinery dry gas, a step of simultaneously subjecting benzene and ethylene to gas-liquid-solid three-phase alkylation reaction on a solid catalyst in a catalytic distillation column, and a step of simultaneously subjecting the reaction product mixture to distillation separation, wherein the performance, configuration and packing patterns of the catalyst and the distillation packing are required to meet given requirements. The technology is characterized in that benzene and ethylene are subjected to three alkylation reactions of gas, liquid and solid on a solid catalyst and are subjected to distillation separation. However, the application range of the raw material gas is small, and the ethylene conversion rate is not high due to insufficient reaction.
Disclosure of Invention
The invention provides a method and a device for producing ethylbenzene by an ethylene gas-liquid phase method, which takes ethylene-rich gas as a raw material, generates gas-liquid phase alkylation reaction with benzene material flow in an alkylation reaction device to generate ethylbenzene, and uses the reaction heat to carry out fractionation.
In order to achieve the above purpose, the invention provides a method and a device for producing ethylbenzene by an ethylene gas-liquid phase method, and the technical scheme of the invention is as follows:
a method for producing ethylbenzene by an ethylene gas-liquid phase method is characterized by comprising the following steps:
1) The ethylene-rich gas and benzene flow is sent to an alkylation reaction device from the bottom of the alkylation reaction device, the ethylene-rich gas and benzene flow flows from bottom to top in the alkylation reaction device to carry out alkylation reaction, a side-stream reactant flow is discharged from the side stream of the alkylation reaction device after alkylation reaction, the side-stream reactant flow is divided into two parts after heat exchange, one part returns to the bottom of the alkylation reaction device, the other part is sent to a separation reaction device, and a product mixture is discharged from the top of the alkylation reaction device and enters a fractionation device;
2) In the fractionating device, the product mixture in the step 1) is fractionated, the fractionated gas is discharged from the top of the fractionating device, heat is recovered and then cooled, the gas enters a reflux tank at the top of the fractionating device for liquid separation, the condensate completely flows back to the fractionating device, the non-condensable gas is sent to the tail gas treatment device, the fractionated liquid phase effluent flows out from the bottom of the fractionating device, one part of the liquid phase effluent is circulated to the alkylation reaction device for further reaction, and the other part of the liquid phase effluent is sent to the separation reaction device;
3) And (3) the material flows entering the separation reaction device in the step (1) and the step (2) are treated by a separation reaction process to obtain an ethylbenzene product.
The reaction pressure of the alkylation reaction is 1.0-5.0 MPa, preferably 1.3-3.8 MPa, and the reaction temperature is 130-250 ℃, preferably 160-220 ℃;
the temperature of the side reactant stream subjected to heat exchange in the step 1) is 160-260 ℃, and the preferable temperature is 200-250 ℃.
The alkylation reaction apparatus of the present invention is preferably an ebullated bed reactor.
The invention also provides a device for producing ethylbenzene by the ethylene gas-liquid phase method, which is used for the method for producing ethylbenzene by the ethylene gas-liquid phase method and is characterized in that: the device for producing ethylbenzene by using the ethylene gas-liquid phase method comprises an alkylation reaction device, a fractionation device, a heat exchanger, a top reflux tank, a tail gas treatment device and a separation reaction device, wherein the alkylation reaction device is provided with a bottom inlet, a side line outlet, a top outlet and a top inlet, the top outlet of the alkylation reaction device is connected with the bottom inlet of the fractionation device, the side line outlet of the alkylation reaction device is respectively connected with the separation reaction device and the bottom inlet of the alkylation reaction device through pipelines, the bottom outlet of the fractionation device is respectively connected with the top inlet of the alkylation reaction device and the separation reaction device through pipelines, the top outlet of the fractionation device is sequentially connected with the heat exchanger and the top reflux tank, the top outlet of the top reflux tank is connected with the tail gas treatment device, and the bottom outlet of the top reflux tank is connected with the top of the fractionation device.
The device for producing ethylbenzene by using the ethylene gas-liquid phase method can be two independent devices or the alkylation reaction device and the fractionation device are integrated in one device, and the alkylation reaction device is positioned below the fractionation device.
The method and the device for producing ethylbenzene by the gas-liquid phase generation of the concentrated ethylene have the following advantages compared with the prior art:
1) The invention does not need to arrange a reboiler, utilizes the heat generated by the alkylation reaction device to fractionate products, fully recycles the heat generated by the alkylation reaction, and has the characteristics of environmental protection and energy saving.
2) The invention simultaneously completes the rough separation of ethylbenzene in the ethylbenzene production device, lightens the pressure of subsequent separation, and has the characteristics of simplifying the flow and reducing the investment of subsequent equipment.
3) The alkylation reaction device can use the ebullated bed reactor to produce ethylbenzene through gas-liquid reaction, and has the characteristics of high operation elasticity and strong raw material adaptability. The method has the characteristics of not harsh requirements on the purity of ethylene, wide applicable concentration range, saving of a complicated ethylene purification process and reduction of equipment investment; the invention adopts liquid-phase circulating benzene to react with ethylene gas to produce ethylbenzene, and the reaction condition is mild. And in the ebullated bed reactor, the contact is sufficient, the ethylene conversion rate is high, and the recovery rate is high. Has the characteristics of high ethylene recovery rate and low energy consumption.
4) The ethylbenzene produced by the invention has good quality, the dimethylbenzene content is lower than 50ppm, and the ethylbenzene content is higher than 99.9%.
The invention will now be described in further detail with reference to the drawings and the detailed description, without limiting the scope of the invention.
Drawings
FIG. 1 is a schematic diagram of an apparatus for producing ethylbenzene by the gas-liquid phase process of ethylene according to the present invention;
FIG. 2 is a schematic diagram of another apparatus for producing ethylbenzene by the gas-liquid phase process of ethylene according to the present invention.
The reference numerals shown in the figures are:
1-ethylbenzene device, 2-fractionation device, 3-alkylation reaction device, 4-heat exchanger, 5-top reflux tank, 6-overhead pump, 7-tail gas treatment device, 8-separation reaction device, 9-ethylene-rich gas feed line, 10-benzene stream feed line, 11-side stream reactant stream line.
Detailed Description
FIG. 1 is a schematic diagram of an apparatus for producing ethylbenzene by the ethylene gas-liquid phase process of the present invention in which an alkylation reaction apparatus 3 and a fractionation apparatus 2 are integrated in one apparatus, such as an alkylation reaction apparatus 3 and a fractionation apparatus 2 are integrated in an ethylbenzene apparatus 1, and the alkylation reaction apparatus 3 is located below the fractionation apparatus 2.
FIG. 2 is a schematic diagram of another apparatus for producing ethylbenzene by the gas-liquid phase process of ethylene in which the alkylation reaction apparatus 3 and fractionation apparatus 2 are two separate units.
As shown in figures 1 and 2, the device for generating ethylbenzene by using the ethylene gas-liquid phase method comprises an alkylation reaction device 3, a fractionation device 2, a heat exchanger 4, a tower top pump 6, a top reflux tank 5, a tail gas treatment device 7 and a separation reaction device 8, wherein the alkylation reaction device 3 is provided with a bottom inlet, a side line outlet, a top outlet and a top inlet, the top outlet of the alkylation reaction device 3 is connected with the bottom inlet of the fractionation device 2, the side line outlet of the alkylation reaction device 3 is respectively connected with the separation reaction device 8 and the bottom inlet of the alkylation reaction device through pipelines, the bottom outlet of the fractionation device 2 is respectively connected with the top inlet of the alkylation reaction device and the separation reaction device 8 through pipelines, the top outlet of the fractionation device is sequentially connected with the heat exchanger 4 and the top reflux tank 5, the top outlet of the top reflux tank is connected with the tail gas treatment device 7, and the bottom outlet of the top reflux tank 5 is connected with the top inlet of the fractionation device 2 through the tower top pump 6.
The invention relates to a method for producing ethylbenzene by an ethylene gas-liquid phase method, which comprises the following steps: the pretreated ethylene-rich gas A enters the bottom of the alkylation reaction device 3 through an ethylene-rich gas feeding pipeline 9, the liquid benzene stream B enters the bottom of the alkylation reaction device 3 through a benzene stream feeding pipeline 10, and the ethylene-rich gas A and the liquid benzene stream B entering the bottom of the alkylation reaction device 3 flow in the same direction from bottom to top and fully react in the alkylation reaction device 3. The alkylation reaction pressure of the alkylation reaction device 3 is controlled to be 1.0-5.0 MPa, preferably 1.3-3.8 MPa, the alkylation reaction temperature is controlled to be 130-250 ℃, preferably 160-220 ℃, and the benzene/ethylene mole ratio in fresh feed is 1-6, preferably 2-4. The alkylation reaction apparatus 3 is preferably an ebullated bed reactor.
The product mixture after reaction in the alkylation reaction device 3 is discharged from the top of the alkylation reaction device 3 and enters the fractionation device 2, and the operation conditions of the fractionation device 2 are as follows: the pressure is controlled to be 0.3-5.0 MPa, preferably 0.5-3.0 MPa.
The alkylation reaction device 3 is provided with a side-draw outlet, the side-draw outlet is connected with a side-reactant flow pipeline 11, part of reaction liquid in the alkylation reaction device 3 is discharged through the side-reactant flow pipeline 11, then one part of reaction liquid is recycled to the bottom of the alkylation reaction device 3 to increase liquid flow, the other part of reaction liquid is sent to a subsequent separation reaction device 8,
the fractionation device 2 uses the heat generated by the alkylation reaction device 3 to fractionate the material entering the fractionation device 2. The gas phase fractionated by the fractionating device 2 is discharged from the top of the fractionating device 2, heat is recovered and cooled by the heat exchanger 4, the gas phase enters the top reflux tank 5 for liquid separation, condensate is pressurized by the overhead pump 6 and flows back to the upper part of the fractionating device 2, noncondensable gas enters the subsequent tail gas treatment device 7, a part of liquid phase effluent fractionated by the fractionating device 2 is circulated to the top of the alkylation reaction device 3 and continuously participates in the reaction, and the other part of liquid phase effluent is sent to the subsequent separation reaction device 8 for treatment, so that an ethylbenzene product is obtained.
The separation reaction device 8 and the tail gas treatment device 7 are not limited in the invention, and any device conventional in the art can be used.
The ethylbenzene production device does not have a reboiler additionally, and the heat generated by liquid phase alkylation is fully utilized for fractionation.
The alkylation reaction device 3 can adopt an ebullated bed reactor, gas and liquid flow in the same direction, contact is sufficient, the ethylene conversion rate can reach 99.99%, and the ethylene recovery rate can reach more than 99.99%.
The ethylene-rich gas provided by the invention is ethylene gas with ethylene concentration of more than or equal to 30 wt%.
The liquid phase effluent after fractionation according to the present invention typically contains benzene, ethylbenzene, polyethylbenzene, and the like.
The feed benzene stream described herein may be from a benzene column side stream.
Claims (12)
1. A method for producing ethylbenzene by an ethylene gas-liquid phase method is characterized by comprising the following steps:
1) The method comprises the steps that an ethylene-rich gas and benzene flow is sent to an alkylation reaction device from the bottom of the alkylation reaction device, the ethylene-rich gas and benzene flow flows from bottom to top in the alkylation reaction device to carry out alkylation reaction, a side-stream reactant flow is discharged from the side of the alkylation reaction device after alkylation reaction, the side-stream reactant flow is divided into two parts after heat exchange, one part of the side-stream reactant flow returns to the bottom of the alkylation reaction device, the other part of the side-stream reactant flow is sent to a subsequent separation reaction device, and a product mixture from the top of the alkylation reaction device enters a fractionation device;
2) In the fractionating device, the product mixture from the top of the alkylation reaction device in the step 1) is fractionated, the gas after fractionation in the fractionating device is discharged from the top of the fractionating device, heat is recovered and then cooled, the gas enters a reflux tank at the top of the fractionating device for liquid separation, condensate flows back to the fractionating device, non-condensable gas is sent to the tail gas treatment device, liquid phase effluent after fractionation in the fractionating device is sent out from the bottom of the fractionating device, one part of the liquid phase effluent is recycled to the alkylation reaction device to continue to participate in the reaction, and the other part of the liquid phase effluent is sent to the separation reaction device;
3) And (3) the material flows entering the separation reaction device in the step (1) and the step (2) are treated by a separation reaction process to obtain an ethylbenzene product.
2. The method for producing ethylbenzene by an ethylene gas-liquid phase process according to claim 1, wherein: the ethylene-rich gas is pretreated to remove impurities and then is sent to the bottom of the alkylation reaction device.
3. The method for producing ethylbenzene by an ethylene gas-liquid phase process according to claim 1, wherein: the reaction pressure of the alkylation reaction is 1.0-5.0 MPa, and the reaction temperature is 130-250 ℃.
4. A process for the production of ethylbenzene by the gas-liquid phase process of ethylene according to claim 1 or 3, characterized in that: the reaction pressure of the alkylation reaction is 1.3-3.8 MPa, and the reaction temperature is 160-220 ℃.
5. The method for producing ethylbenzene by an ethylene gas-liquid phase process according to claim 1, wherein: the alkylation reaction device is an ebullated bed reactor.
6. The method for producing ethylbenzene by an ethylene gas-liquid phase process according to claim 1, wherein: the temperature of the side-stream reactant in the step 1) after heat exchange is 160-260 ℃.
7. A process for the production of ethylbenzene by the gas-liquid phase process for ethylene according to claim 1 or 6, characterized in that: the temperature of the side-stream reactant in the step 1) after heat exchange is 200-250 ℃.
8. The method for producing ethylbenzene by an ethylene gas-liquid phase process according to claim 1, wherein: the operating pressure of the fractionating device is controlled to be 0.3-5.0 MPa.
9. A process for the production of ethylbenzene by the gas-liquid phase process for ethylene according to claim 1 or 8, characterized in that: the operating pressure of the fractionating device is controlled to be 0.5-3.0 MPa.
10. An apparatus for producing ethylbenzene by the gas-liquid phase process of ethylene, which is used in the process of claim 1, wherein: the device for producing ethylbenzene by using the ethylene gas-liquid phase method comprises an alkylation reaction device, a fractionation device, a heat exchanger, a top reflux tank, a tail gas treatment device and a separation reaction device, wherein the alkylation reaction device is provided with a bottom inlet, a side line outlet, a top outlet and a top inlet, the top outlet of the alkylation reaction device is connected with the bottom inlet of the fractionation device, the side line outlet of the alkylation reaction device is respectively connected with the separation reaction device and the bottom inlet of the alkylation reaction device through pipelines, the bottom outlet of the fractionation device is respectively connected with the top inlet of the alkylation reaction device and the separation reaction device through pipelines, the top outlet of the fractionation device is sequentially connected with the heat exchanger and the top reflux tank, the top outlet of the top reflux tank is connected with the tail gas treatment device, and the bottom outlet of the top reflux tank is connected with the top of the fractionation device.
11. The apparatus for producing ethylbenzene by the ethylene gas-liquid phase process according to claim 10, wherein: the alkylation reaction device and the fractionation device are two devices which are independently arranged.
12. The apparatus for producing ethylbenzene by the ethylene gas-liquid phase process according to claim 10, wherein: the alkylation reaction apparatus and the fractionation apparatus are integrated in one apparatus, with the alkylation reaction apparatus being located below the fractionation apparatus.
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| CN202111642661.0A CN116410047A (en) | 2021-12-30 | 2021-12-30 | Method and device for producing ethylbenzene by ethylene gas-liquid phase method |
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