Method for comprehensive utilization of cracking C4

A technology for cracking carbon and materials, which is applied in the fields of dehydration of hydroxyl-containing compounds to prepare ethers, organic chemistry, and hydrogenation to hydrocarbons, etc. Great economic benefits and low utilization value

Active Publication Date: 2009-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problem that the existing cracked carbon four resources are not fully and effectively utilized, the present invention proposes a method to make full use of cracked carbon four resources to prepare methyl tert-butyl ether (MTBE), butene-1, liquefied petroleum gas, butane The combined technology of ene-2 ​​and other products makes full use of C4 resources and obtains the greatest economic benefits

Method used

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  • Method for comprehensive utilization of cracking C4
  • Method for comprehensive utilization of cracking C4

Examples

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Effect test

Embodiment 1

[0040] Reference attached figure 1 Describe the process.

[0041] The mixed C4 component from the ethylene plant, the temperature is 40°C, the pressure is 0.3MPa, the main composition and its mass percentage content are: 50% of 1,3-butadiene, 0.5% of isobutane, 2.3% of n-butane, trans -2-butene 7.3%, cis-2-butene 5.1%, isobutene 22.8%, 1-butene 10%. The cracked mixed C4 enters the selective hydrogenation reactor to remove the diolefins and alkynes therein. The reactor is a fixed-bed reactor, and the catalyst is a Group VIII metal catalyst added with rare earth elements, such as the catalyst for the selective hydrogenation of alkynes and dienes disclosed in the patent CN99112545.2. The reaction conditions are temperature 40°C, pressure 1.0MPa, liquid space velocity 20h -1 . Select the hydrogenation product to enter the etherification unit, use QRE type macroporous cation exchange resin (produced by Qilu Petrochemical Research Institute) as the catalyst, and the reaction con...

Embodiment 2

[0043] Reference attached figure 2 Describe the process.

[0044] The material mainly containing butene-2 ​​and n-butane in Example 1 is sent to the butene extraction unit, which includes an extractive distillation column and a desorption column. The extractive distillation tower uses acetonitrile as a solvent, extracts a raffinate containing 93.4% of n-butane and 6.6% of butene from the top of the extractive distillation tower, and is sent to the cracking furnace for recycling; The acetonitrile solvent of ene-2 ​​is sent to the desorption tower; the butene-2 ​​product with a purity of more than 93% obtained from the top of the desorption tower is sent out of the boundary area, and the acetonitrile solvent is obtained in the tower reactor, and returned to the extraction and rectification tower recycling.

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Abstract

The invention discloses a method for comprehensively utilizing cracking carbon four. The method comprises: firstly, the cracking carbon four is subjected to selective hydrogenation reaction so that acetylene hydrocarbon and diene in the cracking carbon four are subjected to selective hydrogenation to generate mono-olefine; secondly, isobutene in the cracking carbon four reacts to generate methyl tertiary butyl ether by an etherification device; a methyl tertiary butyl ether product and a material mainly comprising butylene-1, butylene-2 and butane are obtained through separation; the materialcomprising the butylene-1, butylene-2 and butane is introduced to a butylene-1 refining system to obtain a butylene-1 product, a material containing carbon three and isobutene and a material mainly containing butylene-2 and n-butane through separation; the material mainly containing the butylene-2 and n-butane is treated to remove the butylene-2 so as to obtain a material containing the n-butane;and the material containing the n-butane is returned to a cracking furnace and is used as raw material. The method adopts selective hydrogenation, full hydrogenation, etherification, rectification, extraction and other combined technologies to fully utilize each component of the cracking carbon four, thereby obtaining largest economic benefit.

Description

technical field [0001] The present invention relates to a kind of combined process of producing methyl tert-butyl ether (MTBE), butene-1, liquefied gas, butene-2 ​​and other products by comprehensive utilization of cracked C4 as raw material, specifically relates to a A method of comprehensive utilization of cracked C4 using combined technologies such as selective hydrogenation, full hydrogenation, etherification, rectification, and extraction. Background technique [0002] Conventional ethylene units generally use naphtha or light hydrocarbons as cracking raw materials to obtain cracked gas through steam thermal cracking, and then enter the quenching compression separation system to obtain cracked C4 at the top of the debutanizer. Cracking C4 contains isobutane, n-butane, isobutene, butene-1, butene-2, butadiene, ethyl acetylene, vinyl acetylene and other components. The cracked C4 can be returned to the cracking furnace after hydrogenation and saturation, and can be used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/02C07C43/04C07C41/09C07C11/08C07C7/04
Inventor 李东风刘智信廖丽华程建民过良王婧
Owner CHINA PETROLEUM & CHEM CORP
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