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Phenol methylation catalyst, preparation method thereof and method for preparing methyl phenol

A catalyst and phenol methyl technology, applied in the field of preparing methyl phenol, can solve the problems of low conversion rate, poor selectivity, short service life and the like, and achieve the effects of high conversion rate, long service life and good stability

Active Publication Date: 2011-11-09
NUTRICHEM LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of low conversion rate, poor selectivity or short service life of phenol methylation catalysts in the prior art, and provide a catalyst with high conversion rate, good selectivity, and long Phenol methylation catalyst with long service life and preparation method thereof, and method for preparing methylphenol using the phenol methylation catalyst

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  • Phenol methylation catalyst, preparation method thereof and method for preparing methyl phenol

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preparation example Construction

[0013] The preparation method of the phenol methylation catalyst also provided by the present invention comprises contacting the solution containing iron ions, cobalt ions, chromium ions, tin ions, aluminum ions and cesium ions with ammonia water, the amount of said ammonia water makes the pH value of the solution 8-10, separate the precipitate obtained, and then dry and roast the precipitate successively. In the solution, the molar ratio of iron ion, cobalt ion, chromium ion, tin ion, aluminum ion and cesium ion is 1: 0.001- 0.1:0.001-0.1:0.001-0.1:0.001-0.1:0.001-0.1, preferably 1:0.005-0.1:0.005-0.1:0.005-0.1:0.005-0.1:0.005-0.1, more preferably 1:0.005-0.05: 0.005-0.05: 0.005-0.05: 0.005-0.05: 0.005-0.05 and the amount of iron ion, cobalt ion, chromium ion, tin ion, aluminum ion and cesium ion makes the content of iron oxide in the product obtained after roasting be 88-99% % by weight, preferably 90-98% by weight, more preferably 96-98% by weight.

[0014] Further prefera...

Embodiment 1

[0033] This example is used to illustrate the phenol methylation catalyst provided by the present invention, its preparation method and the method of using the catalyst to prepare methylphenol.

[0034] 1. Preparation of phenol methylation catalyst

[0035] 810 grams of ferric chloride (5 moles), 1.4 grams of cobalt sulfate heptahydrate (0.005 moles), 2.7 grams of chromium chloride hexahydrate (0.01 moles), 3.33 grams of aluminum sulfate octadecahydrate (0.005 moles), 26 grams of tetrachloride Tin chloride (0.1 mole) and 1.81 gram of cesium sulfate (0.005 mole) are dissolved in 1 liter of deionized water to obtain the mixed solution of metal salt; 21.43g silicon dioxide content is the water glass (0.11 mole of SiO 2 ) is diluted with 100g of water and added to the mixed solution of the above-mentioned metal salts, then the resulting mixed solution is subjected to a co-precipitation reaction with 2 mole / liter of ammonia water, and the addition speed of ammonia water keeps the p...

Embodiment 2

[0039] This example is used to illustrate the phenol methylation catalyst provided by the present invention, its preparation method and the method of using the catalyst to prepare methylphenol.

[0040] 1. Preparation of phenol methylation catalyst

[0041] 1212 grams of ferric nitrate nonahydrate (3 moles), 23.8 grams of cobalt chloride hexahydrate (0.1 moles), 40 grams of chromium nitrate nonahydrate (0.1 moles), 37.5 grams of aluminum nitrate nonahydrate (0.1 moles), 1.3 grams of tetrachloride Tin (0.005 mol) and 1.56 gram of cesium nitrate (0.008 mol) are dissolved in 1 liter of deionized water to obtain the mixed solution of metal salt; 11.43g silicon dioxide content is the water glass (0.057 mol of SiO 2 ) is diluted with 50g of water and added to the mixed solution of the above-mentioned metal salts, then the resulting mixed solution is carried out with coprecipitation reaction with 2 mole / liter of ammonia water, and the addition speed of ammonia water keeps the pH valu...

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Abstract

The invention provides a phenol methylation catalyst and a preparation method thereof. The catalyst contains ferric oxide, cobaltous oxide, chromic oxide, stannic oxide, aluminum oxide and cesium oxide according to metal elements, mole ratios of which are 1:0.001-0.1:0.001-0.1:0.001-0.1:0.001-0.1:0.001-0.1; based on the total weight of the catalyst, the content of ferric oxide is 80-99 weight%. The invention also provides a method for preparing methyl phenol; the method comprises steps of: contacting mixed solution of phenol and methyl alcohol and a catalyst, wherein the catalyst is the penolmethylation catalyst provided by the invention. The phenol methylation catalyst has high reactive activity, good stability and long service life. The phenol methylation reaction using the catalyst has high conversion rate and good selectivity. The method for preparing the catalyst has simple operation and the prepared catalyst has good stability.

Description

technical field [0001] The invention relates to a phenol methylation catalyst, a preparation method thereof and a method for preparing methylphenol. Background technique [0002] In recent years, with the development of fine chemical industries such as pharmaceuticals and pesticides, the demand for methylphenol is increasing. Commonly used methylphenols include o-cresol, 2,6-dimethylphenol, 2,5-dimethylphenol and 2,3,6-trimethylphenol. [0003] O-cresol can be used to produce pesticides, dimethyltetrachloride herbicides, medical disinfectants, spices and chemical reagents. 2,6-Dimethylphenol can be used to prepare polyphenylene ether plastics, phenolic resins, spices, explosives, disinfectants, etc., and is also a raw material for slow heart rhythm medicine. 2,5-Dimethylphenol is mainly used in the pharmaceutical industry as a raw material for the synthesis of hypolipidemic drug gemfibrozil, and can also be used as a dye intermediate. 2,3,6-Trimethylphenol is mainly used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/86C07C37/16C07C39/07
CPCY02P20/52
Inventor 杨瑜杰王开王龙王大文
Owner NUTRICHEM LAB CO LTD