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Method for producing hydroperoxides by catalytic oxidation of aromatic hydrocarbons containing isopropyl

A technology for catalytic oxidation of propyl aromatic hydrocarbons, which is applied in the preparation of peroxygen compounds, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of low selectivity of hydrogen peroxide and by-product benzyl alcohol, etc. Speed, the effect of improving overall cost effectiveness

Inactive Publication Date: 2010-11-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem that current technology exists mainly is: the isopropyl group in diisopropylbenzene or triisopropylbenzene is not all oxidized; The selectivity of hydroperoxide is low, and by-product a large amount of benzyl alcohol

Method used

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  • Method for producing hydroperoxides by catalytic oxidation of aromatic hydrocarbons containing isopropyl
  • Method for producing hydroperoxides by catalytic oxidation of aromatic hydrocarbons containing isopropyl

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The synthesis of ionic liquid cetyltrimethylammonium hydroxide: 36.45g cetyltrimethylammonium bromide (0.1mol) is dissolved in the methylene chloride solvent, adds 5.6g potassium hydroxide (0.1mol), Stir at room temperature for 10 hours, filter off potassium bromide, wash the product with ether, and then dry it in a rotary evaporator at 90°C for 10 hours.

[0025] Get 15g of cumene and put it in a three-necked flask with a reflux device and stirring, add 0.14g of cetyltrimethylammonium hydroxide (catalyst / cumene=0.004, mol / mol), the reaction temperature is 60°C, and Enter air 200ml / min (96L / (h·mol cumene)), after reacting for 24 hours, the conversion rate of cumene is 80%, and the selectivity of cumene hydroperoxide is 85%.

Embodiment 2

[0027] Get 15g of cumene and put it in a three-necked flask with a reflux device and stirring, add 0.1g of 1-methylhydroxide, 3-hexylimidazole (catalyst / cumene=0.004, mol / mol), and the reaction temperature is 90°C. Feed air 150ml / min (96L / (h·mol cumene)), after reacting for 36 hours, the conversion rate of cumene is 94%, and the selectivity of cumene hydroperoxide is 75%.

Embodiment 3

[0029] Take 20g of m-diisopropylbenzene and put it in a three-necked flask with a reflux device and stirring, add 6.69g of butylpyridine hydroxide (catalyst / m-diisopropylbenzene=0.4mol / mol), the reaction temperature is 110°C, and the air 160ml / min (78L / (h mol m-dicumyl)), after reacting for 36 hours, the conversion rate of m-dicumyl was 99%, and the selectivity of m-dicumyl dihydroperoxide was 79% .

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Abstract

The invention relates to a method for producing hydroperoxides by the catalytic oxidation of aromatic hydrocarbons containing isopropyl. Alkaline ionized liquid is used as a catalyst for increasing the oxidation rate of alkylbenzenes, making all isopropyl in the alkylbenzenes oxidized and improving the selectivity of the hydroperoxides.

Description

Technical field: [0001] The invention relates to a method for preparing hydrogen peroxide by catalytic oxidation of isopropyl arene. Background technique: [0002] Since the process of preparing phenol by oxidation of cumene was invented, the oxidation of alkylbenzenes has been extensively studied. At present, more than 90% of phenol in the world is produced by the cumene method. Along with the development and maturation of cumene method to produce phenol acetone technology, people promptly began to study the utilization problem of the intermediate product dicumene of cumene method to produce phenol process since the 1950s. Meta-dicumyl benzene is oxidized to dicumyl dihydroperoxide, and then decomposed under acidic conditions to generate resorcinol and acetone by-product. This method is similar to the process of preparing phenol / acetone by oxidizing cumene, with less environmental pollution, compact process, and convenient continuous production, which represents the develo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B15/024
CPCC07C409/10C07C409/12C07C407/00
Inventor 陈标华徐帅黄崇品刘佳李英霞
Owner BEIJING UNIV OF CHEM TECH