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Modification method for catalytic oxime synthesis catalyst

A catalyst and modification technology, which is applied in the modification field of catalytic synthesis of oxime catalysts, can solve the problems of high hydroxylamine salt dosage, unfriendly environment, etc., and achieve the effects of easy control of the process, simple and easy operation, and improved activity

Active Publication Date: 2014-12-31
ZHEJIANG SAINON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has two main disadvantages: (1) High dosage of hydroxylamine salt; (2) A large amount of by-product inorganic salts are generated at the same time
The process is an environmentally unfriendly process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The first step is the preparation of the mixture

[0022] Mix titanium-silicon molecular sieves with alcohol organics, ketones or ketoxime organics and water to form a reaction mixture, the weight ratio of titanium-silicon molecular sieve: tert-butanol = 1: 50, the weight ratio of titanium-silicon molecular sieve: cyclohexanone =1:25, titanium silicon molecular sieve: the weight ratio of water=1:25, titanium silicon molecular sieve is Ti-MWW;

[0023] The second step modification

[0024] The mixture prepared in the first step was hydrothermally treated at 150° C. for 4 hours under its own pressure, filtered, washed, dried and roasted to obtain a modified titanium-silicon molecular sieve.

Embodiment 2

[0026] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0027] The first step is the preparation of the mixture

[0028] Titanium silicon molecular sieve: weight ratio of tert-butanol=1:10, titanium silicon molecular sieve: cyclohexanone weight ratio=1:15, titanium silicon molecular sieve: water weight ratio=1:30;

[0029] The second step modification

[0030] The mixture prepared in the first step was hydrothermally treated at 150° C. for 10 hours under its own pressure to obtain a modified titanium-silicon molecular sieve.

Embodiment 3

[0032] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0033] The first step is the preparation of the mixture

[0034] Titanium silicon molecular sieve: weight ratio of tert-butanol=1:5, titanium silicon molecular sieve: cyclohexanone weight ratio=1:30, titanium silicon molecular sieve: water weight ratio=1:10;

[0035] The second step modification

[0036] The mixture prepared in the first step was hydrothermally treated at 150° C. for 2 hours under its own pressure to obtain a modified titanium-silicon molecular sieve.

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PUM

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Abstract

The invention relates to a modification method for a catalytic oxime synthesis catalyst, which is characterized by comprising the following operation steps: evenly mixing a titanium / silicon molecular sieve, an alcohol organic substance, a ketone or ketoxime organic substance and water, thus forming a reaction mixture, wherein the weight ratio of the titanium / silicon molecular sieve to the alcohol organic substance is 1:(5-50), the weight ratio of the titanium / silicon molecular sieve to the ketone or ketoxime organic substance is 1:(5-30), and the weight ratio of the titanium / silicon molecular sieve to the water is 1:(5-30); and then, performing hydrothermal treatment on the mixture prepared in the first step under the own pressure at 120-200 DEG C for 1-10 hours, filtering, washing, drying, and roasting to obtain the modified titanium / silicon molecular sieve. The invention has the following remarkable advantages: 1, the operation is simple and easy to implement, and the process is easy to control; 2, for the product obtained through the method, the activity for catalytic oxime synthesis is obviously enhanced; and 3, the modification method can be directly performed in the oximation reaction process.

Description

technical field [0001] The invention relates to a method for modifying catalysts for catalyzing and synthesizing oximes, in particular to a method for modifying catalysts in the synthesis process of oximes using titanium-silicon molecular sieves as catalysts and using ketones, ammonia and hydrogen peroxide as reaction systems. , belongs to the technical field of inorganic chemical synthesis. Background technique [0002] At present, oximes are mainly synthesized by the reaction of hydroxylamine salts and ketones. This process has two main disadvantages: (1) High dosage of hydroxylamine salt; (2) A large amount of by-product inorganic salts are generated at the same time. This process is an environmentally unfriendly process. In order to solve the above problems, people have developed an environment-friendly synthesis process of oxime: using titanium-silicon molecular sieve as a catalyst, and using hydrogen peroxide and ammonia to ammoximate ketone to produce oxime. For ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/89B01J37/10
Inventor 徐书群
Owner ZHEJIANG SAINON CHEM