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Catalyst for olefine epoxidation

A technology of epoxidation and catalyst, applied in the direction of physical/chemical process catalyst, molecular sieve catalyst, organic chemistry, etc. It can solve the problems that it can only be used in slurry bed reactors and cannot be used in large-scale fixed bed reactors, and achieves Effects of activity and selectivity improvement

Inactive Publication Date: 2003-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve this problem, U.S. Patent No. 4,701,428 once reported a method for preparing supported titanium-silicon molecular sieves by spray-drying. However, the particle diameter of the catalyst prepared by this method is only about 20 microns and can only be used for slurry bed reactions. However, it still cannot be used in fixed bed reactors on a large scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0019] The preparation method of titanium silicon molecular sieve is operated with embodiment 1.

[0020] 35 grams of titanium-silicon molecular sieve TS-1 obtained through the above process is mixed with 15 grams of hydrated alumina, 10 grams of magnesium nitrate, 5 grams of polyethylene glycol 20000 and an appropriate amount of dilute nitric acid, and then extruded into strips. The catalyst size is 2×2 mm. [Example 3]

Embodiment 3

[0021] The preparation method of titanium silicon molecular sieve is operated with embodiment 1. But the relative molar content of components in the raw material is:

[0022] SiO 2 / TiO 2 =80,TPAOH / SiO 2 =0.25,H 2 O / SiO 2 =40

[0023] 35 grams of titanium-silicon molecular sieve TS-1 obtained through the above process is mixed with 15 grams of hydrated alumina, 11 grams of calcium nitrate, 8 grams of polyethylene glycol 4000 and an appropriate amount of dilute nitric acid, and then extruded. The catalyst size is 2×2 mm. 【Example 4】

Embodiment 4

[0024] The preparation method of titanium silicon molecular sieve is operated with embodiment 1. But the relative molar content of components in the raw material is:

[0025] SiO 2 / TiO 2 =40, (TEAOH+TBAOH) / SiO 2 =0.25, TEA / TBA=0.2, H 2 O / SiO 2 =60

[0026] 35 grams of titanium-silicon molecular sieve TS-1 obtained through the above process is mixed with 15 grams of hydrated alumina, 10 grams of magnesium nitrate, 10 grams of cellulose methyl ether and an appropriate amount of dilute nitric acid, and then extruded into strips. The size of the catalyst is 2 × 2 mm . 【Example 5】

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PUM

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Abstract

The present invention relates to a catalyst for olefinic epoxidation. Said invention is characterized by that the titanium-silicon molecular sieve synthesized by hydrothermal method can be supported on the aluminium oxide carrier, and the catalyst can be made into the size suitable for industrial application. In the catalyst the alkali metal or / and alkali metal oxide component can be added, so that said catalyst can have higher activity and selectivity, can be used in industrial production.

Description

technical field [0001] This invention relates to catalysts for the epoxidation of olefins, in particular to catalysts for the epoxidation of propylene. Background technique [0002] Titanium-silicon molecular sieves have high catalytic activity and selectivity for the oxidation of low-carbon organic compounds. Using hydrogen peroxide as an oxidant, at a temperature of 40-100°C, it can catalyze epoxidation of olefins, partial oxidation of alkanes, hydroxylation of aromatic hydrocarbons and phenols, and ammoxidation of cyclohexanone. The synthesis method of titanium silicon molecular sieve generally uses tetraethyl titanate or tetrabutyl titanate as titanium source, tetraethyl silicate as silicon source, tetrapropyl ammonium hydroxide (TPAOH) or tetrabutyl ammonium hydroxide (TBAOH) ) is a template, synthesized by hydrothermal method. The molar ratio of the reaction materials is SiO 2 / TiO 2 >30; TPAOH or TBAOH / SiO 2 =0.3~0.6. US Patent U...

Claims

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Application Information

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IPC IPC(8): B01J29/00C07D301/03C07D301/12
Inventor 张惠宁曹静钱堃高焕新陈庆龄
Owner CHINA PETROLEUM & CHEM CORP
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