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Technology for preparing ethylbenzene by means of absorption and purification of high-pressure polyethylene tail gas

A high-pressure polyethylene, absorption and refining technology, applied in the direction of absorption purification/separation, hydrocarbons, hydrocarbons, etc., can solve the problems of catalyst poisoning, gas increase in the discharge flare system, etc., to reduce absorption, improve absorption selectivity, Significant economic benefits

Active Publication Date: 2016-01-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are the following disadvantages: Occupying the work load of the compressor and the rectification capacity of the rear system, restricting the ethylene production capacity, impurity can easily cause catalyst poisoning, and the gas discharge of the flare system increases, etc.

Method used

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  • Technology for preparing ethylbenzene by means of absorption and purification of high-pressure polyethylene tail gas
  • Technology for preparing ethylbenzene by means of absorption and purification of high-pressure polyethylene tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] In the high-pressure polyethylene tail gas, 97% ethylene, 2.0% ethane, C 3 and C 3 + Component 0.65%, Propionaldehyde 0.15%, N 2 0.01%, O 2 2 <5μL / L, CO<5μL / L.

[0073] (1) Absorption and refining: high-pressure polyethylene tail gas enters from the middle of the absorption tower, and contacts with the absorbent from the top of the absorption tower in countercurrent, and the absorbent absorbs and removes C 3 and C 3 + components and impurities such as propionaldehyde to obtain refined ethylene gas. The temperature of the absorption tower is 20°C to 40°C, and the pressure is 5.0MPaG. The absorbent is a mixture of polyethylbenzenes separated from the ethylbenzene unit. That is to say, part of the polyethylbenzene mixture in the polyethylbenzene buffer tank at the top of the polyethylbenzene tower of the ethylbenzene plant is transported to the top of the absorption tower after heat exchange, and used as an absorbent. The volume ratio of absorbent to high-pressure...

Embodiment 2

[0077] In the high-pressure polyethylene tail gas, 95% ethylene, 3.0% ethane, C 3 and C 3 + Component 1.15%, Propionaldehyde 0.18%, N 2 0.02%, O 2 2 <5μL / L, CO<5μL / L.

[0078] (1) Absorption and refining: the high-pressure polyethylene tail gas enters from the middle of the absorption tower, and is in countercurrent contact with the absorbent from the top of the absorption tower, and the absorbent absorbs and removes C 3 and C 3 + components and impurities such as propionaldehyde to obtain refined ethylene gas. The temperature of the absorption tower is 20°C to 40°C, and the pressure is 5.0MPaG. The absorbent is a mixture of polyethylbenzenes separated from the ethylbenzene unit. That is to say, part of the polyethylbenzene mixture in the polyethylbenzene buffer tank at the top of the polyethylbenzene tower of the ethylbenzene plant is transported to the top of the absorption tower after heat exchange, and used as an absorbent. The volume ratio of absorbent to high-pr...

Embodiment 3

[0081] In the high-pressure polyethylene tail gas, 94% ethylene, 2.7% ethane, C 3 and C 3 + Component 3.0%, Propionaldehyde 0.21%, N 2 0.01%, O 2 2 <5μL / L, CO<5μL / L.

[0082] (1) Absorption and refining: the high-pressure polyethylene tail gas enters from the middle of the absorption tower, and is in countercurrent contact with the absorbent from the top of the absorption tower, and the absorbent absorbs and removes C 3 and C 3 + components and impurities such as propionaldehyde to obtain refined ethylene gas. The temperature of the absorption tower is 20°C to 40°C, and the pressure is 5.0MPaG. The absorbent is a mixture of polyethylbenzenes separated from the ethylbenzene unit. That is to say, part of the polyethylbenzene mixture in the polyethylbenzene buffer tank at the top of the polyethylbenzene tower of the ethylbenzene plant is transported to the top of the absorption tower after heat exchange, and used as an absorbent. The volume ratio of absorbent to high-pre...

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Abstract

The invention discloses a technology for preparing ethylbenzene by means of absorption and purification of high-pressure polyethylene tail gas. The technology comprises the steps of 1, absorption and purification, wherein high-pressure polyethylene tail gas enters through the middle of an absorption tower to make countercurrent contact with an absorbent from the top of the absorption tower, and impurities such as C3 and C3+ components and propionaldehyde are absorbed and removed through the absorbent, so that refined ethylene gas is obtained; 2, obtaining ethylbenzene through alkyl group chemical combination, wherein the refined ethylene gas is introduced into an ethylbenzene device for alkylation reaction with benzene to generate ethylbenzene through synthesis. According to the technology, high-pressure polyethylene tail gas is introduced into an absorbing device, impurities, such as C3 and C3+ components and propionaldehyde, having significant influence on ethylbenzene preparation, are effectively separated out, gas obtained through absorption and purification is introduced into the ethylbenzene device to produce ethylbenzene, and then the utilization of high-pressure polyethylene tail gas in ethylbenzene preparation is achieved.

Description

technical field [0001] The invention relates to a process for preparing ethylbenzene, in particular to a process for preparing ethylbenzene by absorbing refined high-pressure polyethylene tail gas. Background technique [0002] Ethylbenzene is an important chemical raw material. Since the late 1930s, a variety of methods for producing ethylbenzene using ethylene and benzene as raw materials have been developed. According to the classification of the reaction state, it can be divided into two types: gas phase method and liquid phase method. [0003] The reaction temperature of the process of gas phase synthesis of ethylbenzene is 370-420°C, and the reaction medium benzene and ethylene are both in the gas phase. The method has the advantages of environmental friendliness, high yield (99.3%), less energy consumption, and low catalyst and equipment investment. However, gas-phase ethylene is easy to oligomerize to generate macromolecular olefins and long-chain alkylbenzenes und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/11C07C11/04C07C2/66C07C15/073
Inventor 吴世逵毛远洪尹兆林王丽钟东文李燕肖树萌付公燚梁朝林林琪
Owner CHINA PETROLEUM & CHEM CORP