A method and system for separating hydrogen from catalytic cracking dry gas

Abstract

The invention provides a separation method of hydrogen from catalytic cracking dry gas and a system therefor. The separation method includes the steps of: performing a hydration reaction to the catalytic cracking dry gas and collecting hydrogen-rich gas. A hydration reactor for the hydration reaction includes the following structures: a chamber, in the flowing direction of a hydrate working fluid, of the hydration reactor comprises an inlet section, a throat pipe section and a stable section, wherein the flowing area of the throat pipe section is less than those in both the inlet section and the stable section. An air inlet is arranged on the side wall, which is relative to the throat pipe section, of the chamber of the hydration reactor. The separation method is free of a step of compressing and pressurizing the catalytic cracking dry gas in a process of separating the hydrogen from the catalytic cracking dry gas through a hydrate separation method in the prior art, so that the separation method is reliable in operation and has strong practical industrial application aviliability.

Description

technical field [0001] The invention relates to a method for separating hydrogen from catalytic cracking dry gas and a system thereof, belonging to the technical field of chemical industry. Background technique [0002] Since catalytic cracking dry gas contains a large amount of hydrogen and ethylene, their comprehensive utilization can save millions of tons of ethylene cracking raw materials and hydrogen production raw materials every year, and has billions of economic benefits. In recent years, many researchers have done a lot of research on the separation and recovery of hydrogen and ethylene in catalytic cracking dry gas. The existing methods for separating hydrogen and ethylene in catalytic cracking dry gas include cryogenic separation, absorption separation, membrane Separation method and hydrate separation method. However, the above methods have different defects, which restrict the recovery of hydrogen and ethylene in the catalytic cracking dry gas. [0003] For ex...

AI Technical Summary

Problems solved by technology

Due to limited field operation space and energy consumption of gas compressors, hydrate separation technology has not been widely used in the separation of hydrogen in catalytic cracking dry gas.

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