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Purification method for butylene by chemical separation process

A technology for chemical separation, butene, applied in chemical instruments and methods, distillation purification/separation, hydrocarbon purification/separation, etc.

Inactive Publication Date: 2011-11-23
TIANJIN TAIHENG GASES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology not only has a reasonable process, but also solves the problem of producing high-purity n-butane

Method used

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  • Purification method for butylene by chemical separation process
  • Purification method for butylene by chemical separation process
  • Purification method for butylene by chemical separation process

Examples

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Effect test

Embodiment 1

[0025] In the synthesis stage of methyl tert-butyl ether, two-stage reaction and methanol excess measures are adopted to improve the removal rate of isobutene. After removing isobutene, the C4 material is subjected to hydrogenation treatment to remove impurities such as butadiene, and then refined Distillation, the bottom of the tower is 2-butene and n-butane, and the overhead fraction is 1-butene and isobutane. The overhead fraction is extracted and distilled to separate isobutane, which obtains high-purity 1-butene, 1500 kg, see process flow figure 1 .

Embodiment 2

[0027] In the synthesis stage of methyl tert-butyl ether, two-stage reaction and methanol excess measures are adopted to improve the removal rate of isobutene. After removing isobutene, the C4 material is subjected to hydrogenation treatment to remove impurities such as butadiene, and then refined Distillation, the tower bottom is 2-butene and n-butane, the overhead fraction is 1-butene and isobutane, and the overhead fraction is extracted and distilled to separate isobutane, which obtains high-purity 1-butene, 2000 kg, see process flow figure 1 .

Embodiment 3

[0029] In the synthesis stage of methyl tert-butyl ether, two-stage reaction and methanol excess measures are adopted to improve the removal rate of isobutene. After removing isobutene, the C4 material is subjected to hydrogenation treatment to remove impurities such as butadiene, and then refined Distillation, the tower bottom is 2-butene and n-butane, and the overhead fraction is 1-butene and isobutane. The overhead fraction is extracted and distilled to separate isobutane to obtain high-purity 1-butene, 4000 kg, see process flow figure 1 .

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Abstract

The invention discloses a purification method for butylene by a chemical separation process. The method is characterized in that: such measures as a two-stage reaction and excess methanol have already been employed at the synthetic phase of methyl tertiary butyl ether so as to improve the removal rate of isobutene; C4 materials which have been deprived of isobutene are subjected to hydrotreatment to remove impurities like butadiene and then to rectification; tower bottoms are 2-butylene and n-butane, while overhead fractions are 1-butylene and isobutene; the overhead fractions are subjected to extractive distillation to separate isobutene, and therefore high purity 1-butylene is obtained. The invention has the advantages of reasonable technology and simple preparation, and is the simplest ideal technology for preparing butylene.

Description

technical field [0001] The invention relates to a chemical product, in particular to a technology for purifying butene by chemical separation, which is suitable for producing high-purity butene. Background technique [0002] In addition to being directly used as fuel and refrigerant, this product is widely used to produce various organic synthesis raw materials, such as butene and butadiene can be produced through dehydrogenation; maleic anhydride, acetic acid, etc. can be produced through catalytic oxidation ; Halobutane can be produced by halogenation; Nitrobutane can be produced by nitration; Carbon disulfide can be produced by catalysis at high temperature; Hydrogen can be produced by steam conversion. In addition, butane can also be used as a motor fuel blend to control volatile matter; it can also be used as a deasphalting agent for heavy oil refining; a wax precipitation solvent in oil wells; an overflow agent for secondary oil recovery; a resin foaming agent; Refrig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/08C07C7/163C07C7/08
Inventor 李中元
Owner TIANJIN TAIHENG GASES
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