Method for preparing isobutene

A technology of isobutene and butene, applied in the field of isobutene preparation, can solve the problems of high energy consumption and low product purity

Active Publication Date: 2016-12-07
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is the problem of high energy consumption and low product purity in the prior art, and a new method for preparing isobutylene is provided

Method used

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  • Method for preparing isobutene

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Experimental program
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Effect test

Embodiment 1

[0029] in such as figure 1In the shown process, firstly, the mixed C4 fraction (8) after hydrogen and light hydrocarbons have been removed mainly includes isobutane, isobutene, 1-butene, n-butane, 2-butene, acetone, water, The material (8) enters the light hydrocarbon removal tower (1) to separate isobutane. Since the difference in boiling point between the light key component of isobutane and the heavy key component of isobutene is 4.9°C, it is carried out by direct compression heat pump rectification process. The components are separated, and the isobutane effluent from the light hydrocarbon removal tower (1) is pressurized and heated by the light hydrocarbon removal tower compressor (6) and is combined with the light hydrocarbon removal tower (1) in the light hydrocarbon removal tower reboiler (4). ) tower kettle material is subjected to heat exchange and cooling, and then further cooled through a throttle valve, a part of which is returned to the light hydrocarbon removal ...

Embodiment 2

[0032] According to the conditions and steps described in Example 1, only the production scale is changed to a 200,000-ton / year isobutane dehydrogenation isobutene plant, and the composition of the reaction gas is also changed. The composition of the reaction gas is as follows:

[0033] component name

[0034] The process flow combining heat pump rectification separation and molecular sieve adsorption separation of the present invention is adopted to prepare high-purity isobutene. The operating conditions of the light hydrocarbon removal tower (1) are: the operating gauge pressure is 0.64MPa, and the operating temperature is 51-60°C. The operating conditions of the heavy hydrocarbon removal tower (2) are: the operating gauge pressure is 0.58MPa, and the operating temperature is 51-64°C. The operating conditions of the adsorption tower are: operating gauge pressure 0.02MPa, operating temperature 111°C. The molecular sieve adsorbent is: calcium-containing modified 5A ...

Embodiment 3

[0036] According to the conditions and steps described in Example 1 and the composition of the reaction gas, the production scale is still 100,000 tons / year isobutane dehydrogenation isobutene plant as an example, but the process operating conditions are changed, and the heat pump rectification separation and The technological process of molecular sieve adsorption and separation is used to prepare high-purity isobutene. The operating conditions of the light hydrocarbon removal tower (1) are: the operating gauge pressure is 0.52MPa, and the operating temperature is 46-56°C. The operating conditions of the heavy hydrocarbon removal tower (2) are: the operating gauge pressure is 0.48MPa, and the operating temperature is 48-60°C. The operating conditions of the adsorption tower are: operating gauge pressure 0.01MPa, operating temperature 105°C. The molecular sieve adsorbent is: calcium-containing modified 5A molecular sieve. The isobutane effluent at the top of the light hydroca...

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Abstract

The invention relates to a method for preparing isobutene. The problems of high energy consumption and low product purity in the prior art are mainly solved. A process combining heat pump rectification separation and adsorption separation is adopted in the method for preparing isobutene. Firstly, heat pump rectification separation is carried out on mixed C4 cut fraction, and energy consumption is lowered by 10%; then, molecular sieve adsorption separation is carried out on mixed C4 cut fraction, and the isobutene product with the purity larger than or equal to 99.7% is obtained. By means of the technical scheme, the problems are well solved, and the method can be used for preparing isobutene.

Description

technical field [0001] The present invention relates to a process for the preparation of isobutene. Background technique [0002] Isobutylene (CH 3 ) 2 C=CH 2 , also known as 2-methylpropene. Flammable and explosive gas, the explosion limit is 1.7% to 9.0% volume, the boiling point is -6.90°C, the critical temperature is 144.75°C, and the critical pressure is 4.00MPa. Isobutene is hardly contained in natural gas, oilfield gas and crude oil, and a large amount of isobutene mainly comes from refinery gas and petrochemical cracking gas, among which the by-product C4 fraction of the catalytic cracking unit in the refinery contains the most isobutene. In the petrochemical industry, isobutene is almost always obtained from refinery gas and cracked C4 fraction, and its content is 5% to 12% and 20% to 30%, respectively. The standard boiling point of the C4 fraction is as follows: [0003] component name Isobutane Isobutylene 1-butene n-butane 2-But...

Claims

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Application Information

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IPC IPC(8): C07C7/04C07C11/09C07C11/08
CPCC07C7/005C07C7/04C07C11/09C07C11/08
Inventor 堵祖荫白玫张斌唐绮颖李真泽葛春方何琨
Owner SINOPEC SHANGHAI ENG
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