Method for producing guaiacol

A technology of guaiacol and catechol, which can be used in the dehydration of hydroxyl-containing compounds to prepare ether, ether preparation, organic chemistry, etc., and can solve problems such as carbon segregation.

Active Publication Date: 2017-10-10
JIAXING ZHONGHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the carbon precipitation problem in the existing guaiacol production process and provide a more effective and stable guaiacol production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Reaction device

[0027] Stainless steel fixed bed reactor, inner diameter 2000mm, filled with 5m3 Alpha-alumina balls. Part of the feed liquid phase methanol is vaporized through the vaporizer, and then enters the catechol saturation tower. Catechol is added in the catechol saturation tower and gasified, mixed with methanol steam, and the gas-phase compound is heated to the reaction temperature through the superheater and then enters the reactor.

[0028] 2) Method of adding catalytic components

[0029] The catalytic component is trimethyl phosphate. Part of the feed liquid phase methanol is vaporized through the vaporizer, and then enters the trimethyl phosphate vaporizer. Trimethyl phosphate is added and vaporized in the trimethyl phosphate vaporizer, mixed with methanol steam, and the gas phase compound is heated to the reaction temperature through the superheater and then enters the reactor. The weight ratio of the feed liquid is: catechol:methanol=1:1. ...

Embodiment 2

[0033] 1) Reaction device

[0034] Stainless steel fixed bed reactor, inner diameter 2000mm, filled with 5m3 Alpha-alumina balls. Part of the feed liquid phase methanol is vaporized through the vaporizer, and then enters the catechol saturation tower. Catechol is added in the catechol saturation tower and gasified, mixed with methanol steam, and the gas-phase compound is heated to the reaction temperature through the superheater and then enters the reactor.

[0035] 2) Method of adding catalytic components

[0036]The catalytic component is phosphoric acid. Part of the feed liquid-phase methanol is vaporized through the vaporizer, and then enters the phosphoric acid vaporizer. Phosphoric acid is added and vaporized in the phosphoric acid vaporizer, mixed with methanol steam, and the gas phase compound is heated to the reaction temperature through the superheater and then enters the reactor.

[0037] The weight ratio of the feed liquid is: catechol:methanol=1:1.

[0038]...

Embodiment 3

[0041] 1) Reaction device

[0042] Stainless steel single-tube reactor with an inner diameter of 32mm and a length of 1200mm. The upper layer of the reaction tube is the gasification and preheating section, and the filling Glass balls, height 40cm. The middle layer of the reaction tube is a catalyst bed, filled with 350cm3 α-alumina balls, height 50cm. The lower layer of the reaction tube is a thermal insulation section, and the filling Glass balls, height 40cm.

[0043] 2) Method of adding catalytic components

[0044] The catalytic component is phosphoric acid, which is directly added to the feed liquid. The weight ratio of the feed liquid is: catechol:methanol:phosphoric acid=1:1. Feed liquid phase The feed liquid enters the top of the reaction tube through the pump.

[0045] Phosphoric acid is vaporized together with the feed liquid in the preheating section of the reaction tube.

[0046] 3) etherification reaction

[0047] The reaction temperature is 275°C, th...

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PUM

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Abstract

The invention discloses a method for producing guaiacol. The method comprises the following steps: adding a phosphorus-containing compound used as a catalytic component into a catechol-methanol mixed gas phase in the gas-phase form, and performing etherification on the catechol at the reaction temperature of not higher than 275 DEG C to produce the guaiacol. The method can avoid the overhigh local concentration of the phosphorus-containing compound in the reactor and prevent the catechol from carbon precipitation, so that the gas-phase catalytic synthesis process of the guaiacol can be implemented stably for a long time.

Description

technical field [0001] The invention relates to a production method of guaiacol, in particular to gas-phase catalytic synthesis of guaiacol. The invention uses the phosphorus-containing compound as the catalyst component, the inert solid as the catalyst carrier, and realizes long-term stable guaiacol catalytic production through a specific catalyst adding method. Background technique [0002] Guaiacol, or o-methoxyphenol, is an important fine chemical intermediate widely used in the synthesis of medicines, spices and dyes, especially as a component in the production of spices (such as vanillin) and pharmaceuticals. Important raw materials and intermediates. The main production process of guaiacol is the diazotization-hydrolysis process, that is, the raw material anthranil is diazotized and hydrolyzed to obtain guaiacol. Both CN97118908.0 and CN03141536.9 relate to the diazonium salt hydrolysis process and its improvement. However, these diazonium hydrolysis processes all h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/23C07C41/09
CPCC07C41/09C07C43/23
Inventor 朱贵法陈敏恒
Owner JIAXING ZHONGHUA CHEM
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