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Catalytic oxidation method of styrene

A technology for catalytic oxidation and styrene, applied in chemical instruments and methods, molecular sieve catalysts, physical/chemical process catalysts, etc., can solve problems such as harmful emissions and complex production processes, achieve simple production processes, overcome complex production processes, and select sex high effect

Active Publication Date: 2013-07-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Compared with the traditional method, the method provided by the present invention overcomes the problems of complex traditional production process, equipment corrosion, and harmful emissions, and adopts heteroatom molecular sieve modified by soluble zinc salt as the oxidation active component, without adding any inhibitor to the raw material. agent or initiator for green synthesis process

Method used

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  • Catalytic oxidation method of styrene
  • Catalytic oxidation method of styrene
  • Catalytic oxidation method of styrene

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preparation example Construction

[0013] In the preparation method provided by the present invention, the solvent is selected from alcohols such as water or methanol, ethanol, n-propanol, isopropanol, tert-butanol, isobutanol or ketones such as acetone and methyl ethyl ketone or acetonitrile, Nitriles such as propionitrile and phenylacetonitrile or their mixtures, preferably acetonitrile, acetone, methanol, water or their mixtures, more preferably acetone, methanol and / or acetonitrile.

[0014] In the preparation method provided by the present invention, there is no special requirement on the order of addition. Styrene can be added first, and oxidant or solvent can also be added first.

Embodiment 1

[0032] Styrene, hydrogen peroxide, solvent and catalyst (molar ratio 0.2: 1 of titanium silicon molecular sieve and zinc nitrate) are 1: 2 according to styrene and hydrogen peroxide mol ratio, solvent acetonitrile and catalyst mass ratio are 20: 1, The mass ratio of styrene and catalyst is 10:1, and the reaction is carried out at a temperature of 50° C. and a pressure of 1.5 MPa. After 2 hours of reaction, the conversion rate of styrene was 39%; the effective utilization rate of hydrogen peroxide was 72%; the selectivity of styrene oxide was 61%.

Embodiment 2

[0034] Styrene, hydrogen peroxide, solvent and catalyst (the molar ratio of titanium silicon molecular sieve and zinc phosphate 1: 1) is 1: 2 according to styrene and hydrogen peroxide molar ratio, solvent acetone and catalyst mass ratio are 50: 1, The mass ratio of styrene and catalyst is 20:1, and the reaction is carried out at a temperature of 60° C. and a pressure of 2.5 MPa. After 2 hours of reaction, the conversion rate of styrene was 58%, the effective utilization rate of hydrogen peroxide was 67%, and the selectivity of styrene oxide was 65%.

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Abstract

The invention discloses a catalytic oxidation method of styrene. According to the method, under oxidation reaction conditions, styrene, an oxidant, a solvent and a catalyst are mixed and subjected to a contact reaction. The method is characterized in that the catalyst is a soluble zinc salt modified heteroatom molecular sieve.

Description

technical field [0001] The invention relates to a method for preparing styrene oxide by catalytically oxidizing styrene. Background technique [0002] Styrene oxide can be used as a diluent, UV absorber, and flavor enhancer for epoxy resins, and is also an important intermediate in organic synthesis, pharmaceuticals, and fragrance industries, such as β-phenylethanol produced by hydrogenation of styrene oxide It is the main component of rose oil, clove oil and neroli oil, and is widely used in the preparation of food, tobacco, soap and cosmetic essence. In recent years, the demand for β-phenylethyl alcohol and medicine levamisole has increased sharply at home and abroad, resulting in a situation in which the supply of styrene oxide in the domestic and foreign markets is in short supply, which has brought broad opportunities for the research on the preparation of styrene oxide. Prospects. [0003] Styrene oxide is mainly synthesized by halohydrin method in industry, and a sm...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/12B01J29/89
Inventor 林民史春风朱斌汝迎春
Owner CHINA PETROLEUM & CHEM CORP
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