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Method for producing high-purity isobutylene

An isobutylene, high-purity technology, applied in the direction of adsorption purification/separation, organic chemistry, etc., can solve the problems of high energy consumption and complicated process, and achieve the effect of large adsorption capacity, fast adsorption rate and large specific surface area

Inactive Publication Date: 2017-03-08
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method patents US 3723561, US4119678, US5365011, CN 200880010697.3, CN 201110211936.5, CN 201110212879.2, CN200880024245.0, etc. have been reported, but there are problems such as complex process and high energy consumption.

Method used

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  • Method for producing high-purity isobutylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The C4 olefin / alkane mixture shown in Table 1 is used as the raw material, and the modified X molecular sieve is used as the adsorbent of the olefin / alkane adsorption separation unit; SAPO-17 phosphorus aluminum molecular sieve is used as the adsorbent of the normal / heterogeneous adsorption separation unit .

[0025] Table 1 Composition of C4 olefin / alkane mixture

[0026] component name Composition wt. / % Isobutane 34 n-butane 10 Isobutylene 15 1-butene 13 2-butene 28 Butadiene <2000ppm

[0027] The olefin / alkane adsorption separation unit and the normal / heterogeneous adsorption separation unit all adopt the four-tower pressure swing adsorption process. The temperature of the separation unit is 30°C, the adsorption pressure is 0.2MPa, and the desorption pressure is 0.05MPa, and 99.2wt.% of isobutylene can be obtained.

Embodiment 2

[0029] Other conditions are the same as in Example 1, except that the desorption of the olefin / alkane adsorption separation unit and the normal / isomeric adsorption separation unit adopts the method of decompression and N2 purge at the same time, the desorption pressure is 0.1MPa, and 99.1wt.% of isobutylene products can be obtained .

Embodiment 3

[0031]Other conditions are the same as in Example 1, using modified Y molecular sieve as the adsorbent for the olefin / alkane adsorption separation unit; using small-pore mordenite as the adsorbent for the normal / heterogeneous adsorption separation unit.

[0032] The olefin / alkane adsorption separation unit and the normal / isomeric adsorption separation unit all adopt the pressure swing adsorption separation process of the six-tower pressure swing adsorption process. The temperature of the olefin / alkane adsorption separation unit is 20°C, the adsorption pressure is 0.15MPa, and the desorption pressure is 0.03MPa. The normal / isomeric adsorption separation unit temperature is 80°C, the adsorption pressure is 0.8MPa, and the desorption pressure is 0.1MPa. % of isobutylene products.

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Abstract

The invention discloses a method for producing high-purity isobutylene. Keys of the method are a high-selectivity adsorbent and optimized adsorptive separation process conditions; and an isobutylene product with the purity of 99wt.% to 99.5wt% can be obtained through carrying out separation by a multi-bed adsorptive separation process. According to the method, the adsorbent is high in selectivity and good in regeneration effect. Compared with reported production methods, the method has the advantages of low energy consumption, relatively high product purity and relatively high product yield.

Description

technical field [0001] The present invention relates to a method for producing high-purity isobutene. Background technique [0002] C4 fraction is an important petrochemical resource, and its utilization mainly includes fuel and chemical utilization. Fuel utilization refers to liquefied petroleum gas used directly as fuel without processing, blending gasoline to adjust vapor pressure, and chemical processing to produce high-octane gasoline components, etc., resulting in great waste; chemical utilization refers to the Utilization of various chemical components such as butadiene, 1-butene, 2-butene, isobutene, n-butane and isobutane, such as high-purity isobutene for the production of butyl rubber, methyl methacrylate, polyester Isobutene, nonylphenol, octylphenol and other organic chemical raw materials and fine chemical products; while high-purity butene-1 can be used as high-density polyethylene (HDPE) and polypropylene, especially linear low-density polyethylene ( The co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C7/13
Inventor 刘宗健汪洋任珉王保正陈韶辉袁浩
Owner SINOPEC YANGZI PETROCHEM
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