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Method for preparing ortho-cresol and 2,6-dimethylphenol

A technology for xylenol and o-cresol, applied in the field of preparing o-cresol and 2, can solve the problems of inability to guarantee long-period operation of the device, high production cost, and inability to be used for production, and maximizes economic benefits and service life. The effect of long, extended service life

Inactive Publication Date: 2012-12-19
HUNAN XINLING CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the production cost of the enterprise is relatively high, and the long-term operation of the device cannot be guaranteed
In addition, the catalyst is only suitable for catalyzing the synthesis of o-cresol, and cannot be used for the production of 2,6-xylenol, or the co-production of the two

Method used

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  • Method for preparing ortho-cresol and 2,6-dimethylphenol
  • Method for preparing ortho-cresol and 2,6-dimethylphenol
  • Method for preparing ortho-cresol and 2,6-dimethylphenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 40mL FeMg 0.05 Sb 0.01 / O The catalyst is loaded in a stainless steel fixed bed reactor, the raw material is phenol:methanol:water=1:2:2 (molar ratio), and the mass space velocity is 1.0 hr -1 , the carrier gas is N 2 The flow rate was 25 mL / min, normal pressure, and the catalyst was operated stably for 2000 h in one pass. The reaction results are shown in Table 1.

[0019]

Embodiment 2

[0021] 40mL FeMg 0.05 Sb 0.01 / O The catalyst is loaded in a stainless steel fixed bed reactor, the raw material is phenol:methanol:water=1:2:2 (molar ratio), and the mass space velocity is 2.0 hr -1 , the carrier gas is N 2 The flow rate was 25 mL / min, the reaction pressure was 0.2 MPa, and the catalyst was operated stably for 2000 h in one pass. The reaction results are shown in Table 2.

[0022]

Embodiment 3

[0024] 40mL FeMg 0.01 Sb 0.04 The / O catalyst is packed in a stainless steel fixed-bed reactor, the raw material is phenol:methanol:water=1:3:1 (molar ratio), and the mass space velocity is 1.0 hr -1 , the carrier gas is N 2 The flow rate was 10 mL / min, and the catalyst was operated stably for 2000 h in one pass. The reaction results are shown in Table 3.

[0025]

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Abstract

The invention discloses a method for preparing ortho-cresol and 2,6-dimethylphenol and is characterized in that a reaction mixed liquid at the mole ratio of phenol to methanol to water being 1: (2-5): (1-3) is pumped the into a reactor by the use of a pump at the feeding space velocity of 0.5-2 hr<-1>; N2 with the flow velocity of 10-25 mL / min is used as a carrier gas; and a vapor-phase alkylation reaction is carried out at the reaction pressure of normal pressure to 0.5 MPa at the reaction temperature of 320-380 DEG C and under the condition of an alkaline Fe / Mg / Sb composite oxide used as a catalyst. The method provided by the invention has advantages as follows: high average conversion rate of phenol, long one-way service life of the catalyst, high ortho-selectivity, and no generation of impurities m.p-cresol and anisole. In addition, the process is simple, and the method is suitable for continuous large-scale production of ortho-cresol, or reallocation of 2,6-dimethylphenol, or co-production of ortho-cresol and 2,6-dimethylphenol.

Description

technical field [0001] The invention relates to a method for preparing o-cresol and 2,6-xylenol, in particular to a method for preparing o-cresol and 2,6-xylenol by using phenol and methanol as raw materials. Background technique [0002] The ortho-methylated products of phenol include o-cresol and 2,6-xylenol, etc., which are important fine chemical intermediates. Among them, o-cresol is mainly used for the synthesis of o-cresol aldehyde resin, o-cresol aldehyde epoxy resin, phenoxy carboxylic acid herbicides (MCPA, MCPB, etc.), and can also be used for the production of o-hydroxybenzaldehyde, dyes, spices and antioxidants. 2,6-xylenol is mainly used in the synthesis of polyphenylene ether resin (PPO is one of the five major engineering plastics), 2,6-dimethylaniline (pesticide, dye intermediate) and Antioxidant etc. [0003] At present, the most important method for producing ortho-methylated phenolic compounds is the gas-phase method of phenol-methanol alkylation, that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/07C07C37/11B01J23/843
Inventor 黄华衷晟佘喜春徐斌谢琼玉胡莲佑
Owner HUNAN XINLING CHEM CO LTD
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