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A kind of green environmental protection methyl salicylate preparation technology

A technology for the preparation of methyl salicylate, which is applied to the preparation of carboxylic acid esters, the preparation of organic compounds, and the activation/preparation of catalysts. It can solve the problems of pollution, affecting processing efficiency and product quality, and poor recycling. problems, to achieve the effect of improving environmental protection performance, improving green environmental protection performance, and shortening reaction time

Active Publication Date: 2018-03-09
ZHENJIANG GAOPENG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, mostly take salicylic acid and methyl alcohol under the action of sulfuric acid catalyst to esterify and refine. The catalytic effect of the compound, product separation and purification are technical difficulties in this field, which affect processing efficiency and product quality. At the same time There are also problems such as poor recycling and certain pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of green environmental protection methyl salicylate preparation technology is characterized in that, preparation steps are as follows:

[0028] A. Preparation of catalyst:

[0029] a) Put tetrapropyl titanate and titanium tetrachloride into the reaction kettle for mixing and stirring, the stirring rate is 55rr / min, add concentrated sulfuric acid dropwise during the stirring process, tetrapropyl titanate: titanium tetrachloride: concentrated sulfuric acid The volume ratio is 22:40:15; after the reaction is completed, A solution is obtained;

[0030] b) Mix ethanol, ethylene glycol, glycerol and butanediol in a ratio of 2:5:7:3 (by mass ratio), and the mixing time is 12 minutes. After the mixing is completed, a mixed alcohol solution is obtained;

[0031] c) preparing a lanthanide nitrate mixture, mixing praseodymium nitrate and neodymium nitrate with a mass ratio of 2:5, the mixing time is 20min, and the mixing speed is 45r / min, and the nitrate mixture is obtaine...

Embodiment 2

[0042] A kind of green environmental protection methyl salicylate preparation technology is characterized in that, preparation steps are as follows:

[0043] A. Preparation of catalyst:

[0044] a) Put tetrapropyl titanate and titanium tetrachloride into the reaction kettle for mixing and stirring, the stirring rate is 80r / min, add concentrated sulfuric acid dropwise during the stirring process, tetrapropyl titanate: titanium tetrachloride: concentrated sulfuric acid The volume ratio is 35:50:20; after the reaction is completed, A solution is obtained;

[0045] b) Mix ethanol, ethylene glycol, glycerol and butanediol in a ratio of 2:5:7:3 (by mass ratio), and the mixing time is 45 minutes. After the mixing is completed, a mixed alcohol solution is obtained;

[0046] c) preparing a lanthanide nitrate mixture, mixing praseodymium nitrate and neodymium nitrate with a mass ratio of 2:5, the mixing time is 20min, and the mixing speed is 45r / min, and the nitrate mixture is obtained...

Embodiment 3

[0057] A kind of green environmental protection methyl salicylate preparation technology is characterized in that, preparation steps are as follows:

[0058] A. Preparation of catalyst:

[0059] a) Put tetrapropyl titanate and titanium tetrachloride into the reaction kettle for mixing and stirring, the stirring rate is 55r-80r / min, add concentrated sulfuric acid dropwise during the stirring process, tetrapropyl titanate: titanium tetrachloride: The volume ratio of concentrated sulfuric acid is 25:45:18; after the reaction is completed, A solution is obtained;

[0060] b) Mix ethanol, ethylene glycol, glycerol and butanediol in a ratio of 2:5:7:3 (by mass ratio), and the mixing time is 33 minutes. After the mixing is completed, a mixed alcohol solution is obtained;

[0061] c) preparing a lanthanide nitrate mixture, mixing praseodymium nitrate and neodymium nitrate with a mass ratio of 2:5, the mixing time is 20min, and the mixing speed is 45r / min, and the nitrate mixture is o...

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PUM

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Abstract

The invention provides a green and environmentally friendly process for preparing methyl salicylate. A sol-gel technique is used for preparing a TiO2 composite photocatalyst, which can replace the traditional concentrated sulfuric acid catalyst and has a high-efficient catalytic activity and improved catalysis effects, so that compared with the traditional concentrated sulfuric acid catalytic process, the reaction efficiency of an esterification reaction between salicylic acid and methanol is increased by more than 30%, the reaction time is shortened, production efficiency of methyl salicylate is greatly improved, pollutants are not easy to generate, and environmental protection performance is highly improved.

Description

technical field [0001] The invention relates to a preparation process of methyl salicylate, in particular to a green and environment-friendly preparation process of methyl salicylate. Background technique [0002] Methyl salicylate is a colorless to pale yellow transparent liquid with a fragrance like wintergreen oil and can be used as a solvent and intermediate, such as the reaction of methyl salicylate with ammonia to produce salicylamide, which is used as an antipyretic and painkiller B Salicylamide itself is also an antipyretic and analgesic, which can be used in the manufacture of insecticides, fungicides, spices, paints, cosmetic inks, and fiber dyeing aids. [0003] In the prior art, mostly take salicylic acid and methyl alcohol under the action of sulfuric acid catalyst to esterify and refine. The catalytic effect of the compound, product separation and purification are technical difficulties in this field, which affect processing efficiency and product quality. At t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08C07C69/84B01J23/10
CPCB01J23/002B01J23/10B01J37/036B01J2523/00C07C67/08C07C69/84B01J2523/3718B01J2523/3725B01J2523/47
Inventor 王成栋王成慧
Owner ZHENJIANG GAOPENG PHARMA
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