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Method for gas-phase synthesis of meta-methyl methyl phenate

A gas-phase synthesis, anisole technology, applied in the direction of ether preparation, ester reaction preparation ether, organic chemistry, etc., can solve problems such as difficulty in meeting safety standards, troublesome handling, etc., and achieve easy reaction control, convenient post-processing, and preparation methods simple effect

Inactive Publication Date: 2004-11-17
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
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Problems solved by technology

Therefore, the industrial use of dimethyl sulfate as a methylation reagent is difficult to meet the safety standards for equipment and production environment requirements
In addition, use dimethyl sulfate as the methylation reagent. The by-product is highly corrosive sulfuric acid, which is highly corrosive to the reaction equipment. It is necessary to neutralize the reaction product with a large amount of alkali, and the subsequent treatment is also very troublesome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Activated carbon (Z 3 ) as catalyst, carry out activity evaluation on continuous fixed fluidized bed reactor, control condition is dimethyl carbonate 3ml / h, m-cresol 3ml / h, reaction temperature is 548K, and gas phase space velocity is 900h -1 , Online for 7 hours, the conversion rate of m-cresol was 23.47%, and the selectivity was 98.69%.

Embodiment 2

[0022] Activated alumina was used as a catalyst, and the activity evaluation was carried out on a continuous fixed fluid bed reactor. The control conditions were dimethyl carbonate 3ml / h, m-cresol 3ml / h, reaction temperature 548K, gas phase space velocity 900h -1 , On-line for 7 hours, the conversion rate of m-cresol was 74.47%, and the selectivity was 95.74%.

Embodiment 3

[0024] Using Y-type molecular sieve as the catalyst, the activity evaluation was carried out in a continuous fixed fluid bed reactor, the control conditions were dimethyl carbonate 3ml / h, m-cresol 3ml / h, the reaction temperature was 548K, and the gas phase space velocity was 900h -1 , On-line for 7 hours, the conversion rate of m-cresol was 32.75%, and the selectivity was 62.41%.

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Abstract

The invention provides a process for synthesizing 3-methylanisole through gas phase synthesizing, wherein the catalyst employs activated charcoal or molecular sieve or activated alumina, preferably the catalyst through solution treating of the alkaline metal or the alkaline earth fluoride or hydroxide compound. The preparation process comprises the steps of, preparing the disposed substance in solution of certain concentration, charging catalyst when stirring, dipping, drying and forming. The invention can realize high yield and selectivity for p-methylanisole.

Description

technical field [0001] The invention relates to the field of organic chemical industry, in particular to a method for gas-phase synthesis of m-methyl-anisole. Background technique [0002] m-methyl-anisole (C 8 h 16 O) is an important intermediate in the production of medicines and pesticides, and is also an important raw material for pressure-sensitive and heat-sensitive dyes. It can also be used as oil antioxidants, plastic processing stabilizers, food flavors, etc. The traditional synthesis method is to react m-cresol with methylene chloride in the presence of sodium hydroxide or potassium hydroxide. Ger.Offen.2 338 811, because monochloromethane gas and air are easy to form explosive mixtures and are highly toxic, so the reaction conditions are difficult to control and inconvenient to operate. Handbook of Practical Fine Chemicals (Organic Volume), Chemical Industry Press, 1st Edition, June 1996, 647. In addition, highly corrosive hydrochloric acid is generated in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/16C07C43/235
Inventor 陈兴权赵天生薛冰
Owner NINGXIA UNIVERSITY
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