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Depth purification method for isobutene

A technology for deep purification and isobutylene, applied in the field of olefin purification, can solve the problems of affecting the utilization of isobutylene, affecting the quality of products, deactivating the catalyst for synthesizing butyl rubber, etc., to reduce the yield, achieve significant economic benefits, and improve the conversion rate and selectivity. Effect

Inactive Publication Date: 2013-02-27
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

The MTBE cracking reaction products mainly contain impurities such as water, isobutylene, methanol, unreacted MTBE and a small amount of tert-butanol (TBA), dimethyl ether (DME), etc. The existence of these impurities affects the utilization of isobutylene, making the polyisobutylene catalyst , isobutylene dimerization, synthetic butyl rubber catalyst deactivation, thus affecting the quality of the product

Method used

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  • Depth purification method for isobutene
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Embodiment 1

[0024] The present embodiment provides a kind of deep purification method of isobutylene, and its flow process is as follows figure 2 Shown, this depth purification method comprises the steps:

[0025] 1. Fill 500mL of 4A molecular sieve and 500mL of desulfurization adsorbent in the drying tower, desulfurization adsorption tower and oxygenate removal tower respectively (CuO content is 3-4wt%, NaY molecular sieve content is 36wt%, and the balance is Al 2 o 3 ) and 500 mL of oxygenate-removing adsorbent (Na 2 O content is 2-3wt%, NaY molecular sieve content is 43wt%, and the balance is Al 2 o 3 ), wherein, the drying tower, the desulfurization adsorption tower and the oxygenate removal tower are respectively stainless steel reactors with an internal diameter of 50mm and a length of 310mm;

[0026]2. Dehydration and drying treatment: the isobutene after rectification (the isobutene after cracking and rectification of the MTBE raw material, the impurity content is as shown in...

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Abstract

The invention relates to a depth purification method for isobutene. The method comprises that the isobutene which is generated through schizolysis of methyl tert-butyl ether (MTBE) serving as a raw material is in contact with a molecular sieve, the water in the isobutene is removed till the content is no more than 10 ppmw, an oxygenated chemical adsorbent is used for removing methanol, dimethyl ether, the MTBE and thiobarbituric acid (TBA) of the isobutene until the content is no more than 10 ppmw and the depth purification is completed. By the aid of the method, the sigma S of the isobutene containing sigma S4-7 ppmw, the methanol of 100-150 ppmw, the dimethyl ether of 200-300ppm, the MTBE of 10-50 ppmw, the TBA of 10-20 ppmw and H2O of 100-150 ppmw is removed through the absorption of a dry sorbent, a desulfurization sorbent and a de-oxygenates agent till the content is no more than 1 ppmw, the methanol, the dimethyl ether, the MTBE and the TBA are removed till the content is no more than 10 ppmw, the H2O is removed till the content is no more than 10 ppmw, and the depth purification is achieved.

Description

technical field [0001] The invention relates to a method for deep purification of isobutene, which belongs to the technical field of olefin purification. Background technique [0002] Isobutene is an important raw material for fine chemicals, and high-purity isobutene is widely used as a monomer or intermediate for the production of butyl rubber and polyisobutylene. [0003] A chemical plant that cracks methyl tert-butyl ether (MTBE) as raw material to produce isobutene. The isobutene produced is generally treated by extraction and precision distillation. The MTBE cracking reaction products mainly contain impurities such as water, isobutylene, methanol, unreacted MTBE and a small amount of tert-butanol (TBA), dimethyl ether (DME), etc. The existence of these impurities affects the utilization of isobutylene, making the polyisobutylene catalyst , Dimerization of isobutylene, synthetic butyl rubber catalyst deactivation, thus affecting the quality of the product. In the isob...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C7/13C07C7/12
Inventor 周广林吴全贵周红军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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