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Method for preparing o-cresol and 2, 6-xylenol by catalysis of heteropolyacid

A technology of heteropolyacid and o-cresol, applied in chemical instruments and methods, preparation of organic compounds, catalysts for physical/chemical processes, etc., can solve the problems of short service life of catalysts, high reaction temperature, low phenol conversion rate, etc. Achieve the effect of less equipment corrosion, low reaction temperature and strong activity

Inactive Publication Date: 2015-06-24
JIANGSU SANJILI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose a kind of loaded heteropolyacid as catalyst, under the condition of gas phase, in fixed bed reaction A new process for the preparation of o-cresol and 2,6-xylenol by catalyzing the reaction of phenol and methanol in a vessel

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  • Method for preparing o-cresol and 2, 6-xylenol by catalysis of heteropolyacid
  • Method for preparing o-cresol and 2, 6-xylenol by catalysis of heteropolyacid

Examples

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Embodiment 1

[0017] Example 1, a method for preparing o-cresol and 2,6-xylenol under the catalysis of heteropolyacids. After phenol and methanol are dissolved in a molar ratio of 1:1, they are gasified at a temperature of 200°C. Weight airspeed 0.1 h -1 , under inert gas protection conditions, through the bed reaction containing heteropolyacids, o-cresol and 2,6-xylenol are prepared; the heteropolyacids are supported on SiO 2 , activated carbon, TiO 2 or on the MCM-41 vector.

Embodiment 2

[0018] Example 2, a method for preparing o-cresol and 2,6-xylenol under the catalysis of heteropolyacids. After phenol and methanol are dissolved in a molar ratio of 1:20, they are vaporized at a temperature of 350°C. Weight airspeed 1 h -1 , under inert gas protection conditions, through the bed reaction containing heteropolyacids, o-cresol and 2,6-xylenol are prepared; the heteropolyacids are supported on SiO 2 , activated carbon, TiO 2 or on the MCM-41 vector.

Embodiment 3

[0019] Example 3, a method for preparing o-cresol and 2,6-xylenol under the catalysis of heteropolyacids. After phenol and methanol are dissolved in a molar ratio of 1:2, they are gasified at a temperature of 250°C. Weight airspeed 0.5 h -1 , under inert gas protection conditions, through the bed reaction containing heteropolyacids, o-cresol and 2,6-xylenol are prepared; the heteropolyacids are supported on SiO 2 , activated carbon, TiO 2 or on the MCM-41 vector.

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Abstract

The invention provides a method for preparing o-cresol and 2, 6-xylenol by catalysis of heteropolyacid. The method includes: mixing phenol with methyl alcohol in a molar ratio of 1:1-20; gasifying at the temperature of 200-350 DEG C, wherein the weight space velocity of the phenol is 0.1-1h<-1>; under the condition of inert gas shielding, reacting via a bed containing the heteropolyacid to obtain the o-cresol and the 2, 6-xylenol. The heteropolyacid is carried on an SiO2, activated carbon, TiO2 or MCM-41 carrier. The method for preparing the o-cresol and the 2, 6-xylenol by catalysis of the heteropolyacid has the advantages that mild reaction condition is achieved since the temperature only ranges from 250 DEG C to 300 DEG C, simplicity in reaction operation is achieved, conversion rate of the phenol and selectivity of the o-cresol and the 2, 6-xylenol are high, the proportion between the o-cresol and the 2, 6-xylenol can be adjusted, and the method is suitable for industrial production completely.

Description

technical field [0001] The invention is a method for preparing o-cresol and 2,6-xylenol under the catalysis of a heteropolyacid, specifically a preparation of a loaded heteropolyacid and the reaction of phenol and methanol under gas phase conditions to prepare o Cresol and 2,6-xylenol methods. Background technique [0002] Both o-cresol and 2,6-xylenol are important fine chemical intermediates. Among them, o-cresol is mainly used in the production of 2-methyl-4-chlorine herbicides, synthetic resins such as cresol phenolic resin and epoxy cresol phenolic resin, spices such as salicylaldehyde and carvacrol, antioxidants such as Ethanox736 and Irganox245, and polymerization inhibitors. DNOC, dyes, etc.; 2,6-xylenol is mainly used for the synthesis of polyphenylene ether resin, one of the five major engineering plastics, and the production of 2,6-dimethylaniline, an intermediate for pesticides and dyes. Oxygen agent Lowinox44M26 etc. [0003] In the early stage, o-cresol and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/07C07C37/16B01J31/18B01J31/26B01J31/38
Inventor 杨世刚刘德标王恒启梁启程
Owner JIANGSU SANJILI CHEM