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Method for increasing yields of propylene, ethylene and butadiene

A technology of butadiene and ethylene, applied in chemical instruments and methods, bulk chemical production, hydrocarbons, etc., can solve the problems of low economic value

Active Publication Date: 2013-11-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this part of carbon tetraolefin and alkane mixture, it is often used as urban civil fuel liquefied petroleum gas, and its economic value is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] On the basis of Comparative Example 1, add a catalytic cracking system with carbon tetraolefins and alkane mixture in the steam cracking process as raw material, this catalytic cracking system is mainly composed of olefin catalytic cracking reactor, mixed olefin and alkane catalytic cracking reactor and The composition of the carbon tetraolefin catalytic dehydrogenation reactor is as follows:

[0037] (1) At first the butane and butene mixture in Comparative Example 1 are passed in the catalytic cracking reactor 1 (catalytic cracking reactor of olefins), and the carbon tetraolefins in the feedstock are contacted with the catalytic cracking catalyst of olefins and heated at a reaction temperature of 550° C. , Reaction pressure (gauge pressure) 0.15MPa, space velocity 3h -1 The catalytic cracking reaction is carried out under the conditions, and the catalyst catalytically cracks 70% of the carbon tetraolefins in the feed into a stream 1 rich in propylene and ethylene. The...

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PUM

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Abstract

The invention relates to a method for increasing yields of propylene, ethylene and butadiene in a steam cracking process. A cracking furnace and a separation system are provided in a steam cracking process, and a catalytic cracking system is additionally arranged on that basis, wherein the catalytic cracking system takes a C4 fraction generated in the steam cracking process as a raw material; and all or part of a mixture of C4 alkane and olefin is converted into cracking gas rich in the ethylene, the propylene and the butadiene through the catalytic cracking system, and the separation and purification of the target product is mainly finished in the separation system of the steam cracking process. The invention is characterized in that: the potential of the separation (recovery) system in the steam cracking process is fully tapped, and a catalytic cracking system, consisting of a cracking C4 catalytic cracking unit, a olefin and alkane mixture catalytic cracking unit, a C4 catalytic dehydrogenation unit and a simple separating device, is additionally provided only, thus the yields of the ethylene, the propylene and the butadiene are increased, and the economic benefit of corporation is beneficial to being improved.

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 production of propylene and ethylene by using the existing steam cracking ethylene device and its separation (recovery) system. Background technique [0002] At present, the main production method of low-carbon olefins such as ethylene, propylene and butadiene in the world is steam cracking / thermal 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 for thermal cracking reaction to generate cracked gas rich in ethylene, propylene and butadiene, and then send the cracked gas to separation (recovery) The system is used for separation and purification to obtain cracking products such as ethylene, propylene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06C07C11/16C07C5/333
CPCY02P20/52
Inventor 李蔚付啸刘小波周先锋郝雪松王国清
Owner CHINA PETROLEUM & CHEM CORP