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Method for synthesizing epoxide by catalysis of titanium-silicon molecular sieve

A titanium silicon molecular sieve and epoxide technology, applied in the direction of organic chemistry, etc., can solve the problems such as the utilization rate of hydrogen peroxide is not improved, not reached, etc., and achieve the effect of improving the conversion rate, improving the selectivity, and being environmentally friendly.

Active Publication Date: 2014-12-24
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the utilization of hydrogen peroxide did not increase
[0004] In summary, in the existing technology of producing epoxides using titanium-silicon molecular sieves as catalysts, it has not yet achieved the condition of improving the selectivity of epoxidized products, simultaneously increasing the conversion rate of reactant olefins and improving the utilization rate of hydrogen peroxide. technical level

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first step catalyst is titanium-silicon molecular sieve TS-1, the reactant is n-hexene, the solvent is methanol, the oxidant is hydrogen peroxide with a mass concentration of 30.1%, and the additive is ammonia water with a mass concentration of 2.6%. The catalyst, solvent, Reactant, oxidizing agent and additive are added in the reactor, stir, reactant: catalyst: the weight ratio of solvent is 1:0.05:5, reactant: the molar ratio of oxidizing agent is 1:1, additive: the molar ratio of titanium in the catalyst 1:1;

[0026] The second step The reaction system in the first step is reacted at normal pressure and 60°C for 2 hours, and the catalyst is separated by conventional filtration, and then the product is separated by conventional operation, that is, hexane oxide corresponding to n-hexene.

[0027] The analysis results show that the selectivity of hexane oxide is 97.7%, the conversion rate of n-hexene is 51.1%, the conversion rate of hydrogen peroxide is 52.0%, and ...

Embodiment 2～6

[0029] Except following difference, all the other are with embodiment 1:

[0030] Additive in the first step: the mol ratio of titanium in the catalyst is:

Embodiment 2

[0031] Example 2 0.05:1

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Abstract

The invention discloses a method for synthesizing an epoxide by catalysis of a titanium-silicon molecular sieve. According to the method, olefin, a titanium-silicon molecular sieve catalyst, a solvent and hydrogen peroxide are mixed to form a reaction system. The method is characterized in that a compound additive which can form a hydrogen bonding effect with oxygen atoms or hydrogen atoms in the hydrogen peroxide and contains nitrogen atoms and / or oxygen atoms is added into the reaction system, wherein the molar ratio of the additive to titanium in the catalyst is (0.05-5): 1. By the method, the selectivity of the epoxide is improved, and the conversion rate of the olefin reactant and the utilization rate of the hydrogen peroxide serving as an oxidant are improved at the same time; the consumption of the additive and the quantity of titanium atoms in the active center of the catalyst are in the equivalent level, namely catalytic quantity, so the consumption of the additive is low; and the reaction process is simple and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a method for catalyzing and synthesizing epoxides with titanium-silicon molecular sieves. Under the condition that the compound in which the oxygen atom or the hydrogen atom forms a hydrogen bond is an additive, a method for producing an epoxide by catalytically oxidizing a compound containing a carbon-carbon double bond and at least one other functional group with high activity and high selectivity. Background technique [0002] Epoxides are an important class of organic synthesis intermediates, widely used in petrochemical, fine chemical and organic synthesis fields. One of the current methods for synthesizing epoxides is to use titanium-silicon molecular sieves as catalysts and hydrogen peroxide as an oxidant to catalyze the synthesis of epoxides. Because the by-product in this process is water, it does not produce environmental pollution, and it is an environmentally...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/12
Inventor 刘月明张硕邓秀娟方向青王钰宁卓佐西申璐林龙飞邱彩凤何鸣元
Owner EAST CHINA NORMAL UNIV