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A kind of method of producing guaiacol

A technology based on guaiacol and all the way, which is applied in the field of gas-phase catalytic synthesis of guaiacol, and can solve problems such as carbon deposition

Active Publication Date: 2021-03-26
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 a vaporizer and then enters the catechol saturation column. The catechol is added and vaporized in the catechol saturation tower, mixed with methanol vapor, and the gas-phase compound is heated to the reaction temperature through the superheater and then enters the reactor.

[0028] 2) Method for 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 a trimethyl phosphate vaporizer, mixed with methanol vapor, and the gas-phase compound is heated to the reaction temperature through a 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 a vaporizer and then enters the catechol saturation column. The catechol is added and vaporized in the catechol saturation tower, mixed with methanol vapor, and the gas-phase compound is heated to the reaction temperature through the superheater and then enters the reactor.

[0035] 2) Method for 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 vapor, 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.

[00...

Embodiment 3

[0041] 1) Reaction device

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

[0043] 2) Method for 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. The feed liquid phase feed liquid enters the top of the reaction tube through a 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 was 275°C, the feed flow rate was ...

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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 present invention relates to the production method of guaiacol, in particular to the gas-phase catalytic synthesis of guaiacol. The present invention uses a phosphorus-containing compound as a catalytic component, an inert solid as a catalyst carrier, and realizes long-term stable catalytic production of guaiacol through a specific catalyst addition method. Background technique [0002] Guaiacol, or o-methoxyphenol, is an important fine chemical intermediate and is widely used in the synthesis of medicines, fragrances and dyes, especially as fragrances (such as vanillin) and in the production of pharmaceuticals. Important raw materials and intermediates. The main production process of guaiacol is the diazotization-hydrolysis process, that is, the raw material o-anisole 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 hy...

Claims

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Application Information

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Patent Type & Authority Patents(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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