A separation process for ethylene-rich cracking dry gas classification used in ethylbenzene production equipment

An ethylene-rich, gas-liquid separation tank technology, applied in the field of separation technology, can solve the problems of difficult to accurately control the temperature and temperature rise of an alkylation reactor, unfavorable to obtain high-quality ethylbenzene products, complicated reactor process flow, etc. Achieve the effect of reducing the demand for cooling capacity, increasing the partial pressure, and reducing energy consumption

Active Publication Date: 2021-01-05
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the ethylene concentration exceeds 25.0mol%, it is difficult to accurately control the temperature and temperature rise of the alkylation reactor, which will lead to a decrease in the selectivity of the reaction between ethylene and benzene to form ethylbenzene, which is not conducive to obtaining high-quality ethylbenzene products
In this case, the dry gas to ethylbenzene unit needs to adopt multi-stage variable mass feed and catalyst gradient loading process based on kinetic control, the process flow of the reactor is more complicated, and the difficulty of operation and maintenance is also significantly increased

Method used

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  • A separation process for ethylene-rich cracking dry gas classification used in ethylbenzene production equipment
  • A separation process for ethylene-rich cracking dry gas classification used in ethylbenzene production equipment
  • A separation process for ethylene-rich cracking dry gas classification used in ethylbenzene production equipment

Examples

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Effect test

Embodiment 1

[0018] Example 1 Aiming at the by-product of a 2.2 million tons catalytic cracking unit of a refining and chemical enterprise, the ethylene-rich cracking dry gas with deep removal of propylene and above hydrocarbons, the flow rate is about 30000Nm 3 / h, using the ethylene-rich cracking dry gas classification in the present invention to be used in the separation process of the ethylbenzene production device to produce low-concentration ethylene (60mol%) raw materials.

[0019] Table 1 Example 1 key material (dry basis) composition and a list of operating parameters.

[0020]

[0021] The ethylene-rich cracking dry gas S1 with deep removal of propylene and above hydrocarbons is pressurized by the first compressor 1 to 2.75MPaG, then enters the first cooler 2, lowers the temperature to 40°C, and then enters the first gas-liquid separation tank 3 , the first condensate S2 is produced at the bottom of the tank, and the first non-condensable gas S3 is produced at the top of the t...

Embodiment 2

[0026] Example 2 Aiming at the ethylene-rich cracking dry gas with deep removal of propylene and above hydrocarbons produced by a 3.5 million tons catalytic cracking unit in a refining and chemical enterprise, the flow rate is about 25500Nm 3 / h, using the ethylene-rich cracking dry gas classification in the present invention to be used in the separation process of the ethylbenzene production device to produce low-concentration ethylene (60mol%) raw materials.

[0027] The ethylene-rich cracked dry gas S1 with deep removal of propylene and above hydrocarbons is pressurized to 2.85MPaG by the first compressor 1, then enters the first cooler 2, lowers the temperature to 40°C, and then enters the first gas-liquid separation tank 3 , the first condensate S2 is produced at the bottom of the tank, and the first non-condensable gas S3 is produced at the top of the tank; the first non-condensable gas S3 enters the precision filter 4 to remove solid particles and residual liquid mist, a...

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Abstract

The invention provides a separation process of ethylene-rich cracking dry gas and for an ethylbenzene production device and belongs to the field of petrochemical industry. Through coupled processes ofmembrane separation, compression condensing and rectification, the ethylene-rich cracking dry gas is separated into a low-concentration ethylene raw material and a high-concentration ethylene raw material which are respectively used for a dry-gas-process ethylbenzene production device and a high-pressure liquid-phase process ethylbenzene production device. Through graded use, the problem that a reactor for preparing ethylbenzene through dry gas exceeds temperature is avoided, sufficient and reasonable utilization of high-concentration ethylene is realized, and ethylbenzene production energy consumption can be lowered remarkably. A preposed membrane separation unit can deeply dewater, stable low-temperature condensing can be ensured, most hydrogen can be removed, carbon binary pressure canbe increased, and cryogenic energy consumption can be lowered remarkably; reasonable depressurizing gasification and cold recycling of demethanation liquid-phase products are realized, and refrigeration needs are reduced remarkably.

Description

technical field [0001] The invention relates to a separation process for grading cracked dry gas rich in ethylene (with a content of more than 25 mol%) and using it in an ethylbenzene production device, belonging to the field of petrochemical industry. The process uses membrane separation, compression condensation and rectification coupling process to separate ethylene-rich cracked dry gas into low-concentration ethylene (<20mol%) raw material and high-concentration ethylene (>60mol%) raw material, and the low-concentration raw material is used for dry gas French ethylbenzene production equipment, high-concentration raw materials are used in high-pressure liquid phase ethylbenzene production equipment. The invention not only avoids the problem of overheating of the alkylation reactor in the process of producing ethylbenzene from dry gas, but also realizes the rational utilization of high-concentration ethylene through the graded use of ethylene-rich cracking dry gas, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/00
CPCC10G53/00
Inventor 阮雪华贺高红肖武姜晓滨焉晓明代岩郭明钢肖红岩
Owner DALIAN UNIV OF TECH
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