Method for increasing production of propylene and ethylene

Abstract

The invention relates to a method for increase production of propylene and ethylene in a steam pyrolyzing process. The steam pyrolyzing process comprises a pyrolyzing furnace and a separation (recovery) system, on this basis, a catalytic pyrolyzing system which takes catalytic pyrolyzing gasoline produced in an oil refining process as a raw material is additionally arranged, by the catalytic pyrolyzing system, the part or the whole of alkene of the catalytic pyrolyzing gasoline is converted into pyrolysis gas with rich propylene and ethylene, the catalytic pyrolysis gas is cooled and separated to form under-C5 fraction flow and over-C6 friction flow, the separation and the purification of the under-C5 fraction flow is completed by the separation (recovery) system in the steam pyrolyzing process, after the alkene content in the over-C6 fraction flow or in the mixture can be reduced by hydrogenation or naphthalizing, and other modes, then, the over-C6 friction flow is used as a pyrolysis raw material, and the defect of the insufficient pyrolysis raw material can be solved. In the invention, the potential of the separation (recovery) system in the steam pyrolyzing device can be utilized; as the catalytic pyrolyzing system formed by a catalytic pyrolyzing reactor and simple separation equipment is added, the production volume of light olefins such as the propylene, the ethylene and the like can be increased; and the economic benefit of enterprises can be increased.

Description

technical field [0001] The invention relates to a method for increasing the production of propylene and ethylene, more specifically, the invention relates to a method for increasing the output of propylene and ethylene by utilizing the existing steam cracking ethylene production device and separation device. Background technique [0002] At present, the main production method of low-carbon olefins such as ethylene and propylene in the world is steam cracking. The steam cracking process consists of two parts: a cracking furnace and a separation (recovery) system. In the steam cracking process, the cracking raw material and steam mixture are heated to high temperature in the cracking furnace to carry out the steam cracking reaction to generate cracked gas rich in ethylene and propylene, and then send the cracked gas into the separation (recovery) system for Separation and purification to obtain cracking products such as ethylene and propylene. [0003] In recent years, with t...

AI Technical Summary

Problems solved by technology

[0005] In order to alleviate the contradiction between supply and demand in the domestic market of low-carbon olefins such as propylene and ethylene, and aiming at the problem of domestic cracking raw material quality decline or cracking raw material shortage leading to idle production capacity, the present invention proposes to increase the catalytic cracking gasoline of the refinery in the existing steam cracking device Catalytic cracking system for producing propylene and ethylene to increase the production of propylene and ethylene

Images