Method for separating low-carbon olefins

A low-carbon olefin and separation method technology, applied in the purification/separation of hydrocarbons, hydrocarbon production from carbon oxides, absorption purification/separation, etc., can solve inappropriate problems, achieve good applicability, reduce equipment investment and energy consumption effect

Active Publication Date: 2011-07-06
EAST CHINA ENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is similar to the above two methods, avoiding the use of ethylene compressors, using ethane as the absorbent, and part of the ethane is evaporated from the top of the absorption tower as fuel gas, but when the reaction process produces less ethane than the absorption tower When ethane is evaporated, it is not suitable to use ethane as absorbent

Method used

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  • Method for separating low-carbon olefins
  • Method for separating low-carbon olefins
  • Method for separating low-carbon olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 , the low-carbon hydrocarbons from the reaction are cooled after quenching, compression and impurity removal. Under the conditions of 3.2MPa and -30°C, they first enter the feed separation tank of the demethanizer for gas-liquid separation. The demethanizer uses propane as the absorbent , where the temperature of the propane absorbent is -20°C. The top of the demethanizer is CH 4 、H 2 , CO and N 2 Etc. light components and partially lost propane absorbent, the C2+ components at the bottom of the demethanizer, directly enter the deethanizer. All the C2 at the top of the deethanizer goes to the ethylene tower, and does not circulate back to the reaction system, and the C3+ at the bottom of the deethanizer goes into the depropanizer. Refined ethylene is extracted from the side line of the ethylene tower, crude ethylene is removed from the compression system at the top of the tower, crude ethylene is not extracted from the lower side line, and the botto...

Embodiment 2

[0038] Such as figure 2 , the low-carbon hydrocarbons from the reaction are cooled after quenching, compression and impurity removal. Under the conditions of 3.2MPa and -30°C, they first enter the demethanizer feed separation tank for gas-liquid separation. The demethanizer uses ethane as absorption agent, where the temperature of the ethane absorbent is -20°C. The top of the demethanizer is CH 4 、H 2 , CO and N 2 Etc. light components and partially lost ethane absorbent, the bottom of the tower is C2+ components, which directly enter the deethanizer. Part of the C2 at the top of the deethanizer goes to the ethylene tower, and part of it is recycled to the reaction system, and the C3+ at the bottom of the deethanizer enters the depropanizer. Refined ethylene is extracted from the side line of the ethylene tower, crude ethylene is extracted from the top and side line of the tower, and part of the C2 extracted from the top of the deethanizer is recovered by the expander and...

Embodiment 3

[0044] Such as image 3 , the low-carbon hydrocarbons from the reaction are cooled after quenching, compression and impurity removal. Under the conditions of 3.2MPa and -30°C, they first enter the demethanizer feed separation tank for gas-liquid separation. The demethanizer uses ethane and propane The mixture is used as the absorbent, and the temperature of the absorbent is -20°C. The top of the demethanizer is CH 4 、H 2 , CO and N 2 Light components such as light components and partially lost ethane and propane absorbents, C2+ components at the bottom of the tower, directly enter the deethanizer. Part of the C2 at the top of the deethanizer goes to the ethylene tower, and part of it is recycled to the reaction system, and the C3+ at the bottom of the deethanizer enters the depropanizer. Refined ethylene is extracted from the side line of the ethylene tower, crude ethylene is extracted from the top and side line of the tower, and part of the C2 extracted from the top of th...

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Abstract

The invention discloses a separation method of low-carbon olefins, which adopts the mature normal separation process flow of the traditional ethylene industry and improves ethylene yield by using a solvent absorption process in a demethanizer. In the invention, the normal separation process is adopted, ethane, propane or mixture of ethane and propane is used as an absorbent, a deep-cooling cold box and an ethylene compressor are not used, equipment investment and energy consumption are lowered, and the method is very applicable to a process for producing low-carbon olefins by using oxygenatedchemicals or catalytic reaction of olefins.

Description

technical field [0001] The invention belongs to the technical field of separation of low-carbon olefins, in particular to a separation method for preparing low-carbon olefins from oxygen-containing compounds or catalytic reactions of hydrocarbons to prepare low-carbon olefins. Background technique [0002] Ethylene and propylene are the basic raw materials of the petrochemical industry, and their traditional production methods are mainly produced by steam cracking of naphtha, which is heavily dependent on petroleum resources. With the increasingly tight oil supply, the production of low-carbon olefins from oxygenated compounds has become a research hotspot and has been greatly developed. Oxygenated compounds include alcohols, ethers, aldehydes and ketones, among which methanol and dimethyl ether are widely used. It can be produced through coal or natural gas, which can alleviate the pressure on oil supply to a certain extent, especially in line with my country's national cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/11C07C1/04C07C4/06C07C11/04C07C11/06C07C9/08
CPCY02P20/10Y02P20/50Y02P20/52Y02P30/40
Inventor 江家贵蔡林清王建平郭勇义吴越峰肖红胡存马振明陈菊士汪明静
Owner EAST CHINA ENG SCI & TECH
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