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Method for oxidizing isobutane

A technology of isobutane and oxidant, applied in chemical instruments and methods, preparation of oxidation reaction, preparation of peroxy compounds, etc., can solve the problems of greatly increased investment cost, huge oxidation equipment, long oxidation time, etc., and achieves low cost, high technology Simple, high isobutane conversion effect

Active Publication Date: 2012-10-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the traditional oxidation of isobutane, the oxidation time is long and the efficiency is low, resulting in huge oxidation equipment and a large increase in investment costs
And it is required that the scale must reach a certain level to have economic benefits, thus limiting the further development of the process

Method used

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  • Method for oxidizing isobutane
  • Method for oxidizing isobutane
  • Method for oxidizing isobutane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Under the condition that the temperature is 60° C. and the pressure is 0.5 MPa, with the mixed gas of ozone and oxygen (wherein, 15 volume percent of the mixed gas is ozone) as the oxidant, isobutane, the mixed gas and solvent acetone are The oxidation reaction of isobutane is carried out under the condition that the molar ratio of butane: ozone in the mixed gas: solvent acetone is 1:1:1.

[0035] The results of the 2-hour reaction were as follows: the conversion rate of isobutane was 17%, the selectivity of isobutane peroxide was 94%, and the selectivity of tert-butanol was 6%.

Embodiment 2

[0037] The oxidizing agent used in this embodiment is a mixed gas containing ozone, which is prepared by using air as the oxygen source of the ozone generator (wherein, 15% by volume of the mixed gas is ozone), at a temperature of 20°C and Pressure is under the condition of 1.5MPa, isobutane, described mixed gas and solvent methanol are carried out isobutane according to the condition that isobutane: ozone in the described mixed gas: the molar ratio of solvent methanol is 1: 1: 5 oxidation reaction.

[0038] The result of reacting for 5 hours is as follows: the conversion rate of isobutane is 14%, the selectivity of isobutane peroxide is 97%, and the selectivity of tert-butanol is 3%.

Embodiment 3

[0040] Under the condition that the temperature is 80° C. and the pressure is 0.2 MPa, with the mixed gas of ozone and oxygen (wherein, 5 volume % of the mixed gas is ozone) as the oxidant, the isobutane, the mixed gas and the solvent acetonitrile are The oxidation reaction of isobutane is carried out under the condition that the molar ratio of butane: ozone in the mixed gas: solvent acetonitrile is 1:2:10.

[0041] The results of the 2-hour reaction were as follows: the conversion rate of isobutane was 21%, the selectivity of isobutane peroxide was 92%, and the selectivity of tert-butanol was 8%.

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Abstract

The invention provides a method for oxidizing isobutane. The method comprises the following step of: making isobutene contact with an oxidant under an oxidizing reaction condition, and is characterized in that: the oxidant is an ozone-containing gas. In the method, isobutene can be effectively oxidized by taking ozone as an oxidant without adding any catalyst; and moreover, the method has a simple process, and the reaction degree can be well controlled without adding an additional initiator or an inhibitor into a reaction system. Compared with the conventional method, the method provided by the invention has the advantages of simple and convenient process, low cost, high isobutene transformation rate and the like. Moreover, the method provided by the invention is not limited by the production scale, so that the method has a good industrial application prospect.

Description

technical field [0001] The invention relates to a method for isobutane oxidation. Background technique [0002] Tert-butanol, 2-methyl-2-propanol, is the simplest tertiary alcohol and one of the four isomers of butanol. Tert-butanol is used as a solvent and in the production of denatured ethanol, paint removers, gasoline additives and other everyday products such as fragrances and perfumes. [0003] Industrially, tert-butanol can be produced by oxidation of isobutane. The oxidation of isobutane mainly adopts air auto-oxidation process to produce isobutane peroxide (isobutane hydroperoxide), and then the peroxide is oxidized to propylene to produce Propylene oxide is obtained, and the peroxide is converted into tert-butanol by-product. This is the industrial co-production process of propylene oxide and tert-butanol, which is a kind of co-oxidation method and one of the main production processes of propylene oxide (accounting for about 20% of the production capacity of propy...

Claims

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Application Information

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IPC IPC(8): C07C27/14C07C409/04C07C407/00C07C31/12C07C29/48
Inventor 朱斌史春风林民汝迎春
Owner CHINA PETROLEUM & CHEM CORP
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