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Green and environment-friendly preparation method for salicylic acid with high yield

A green, environmentally friendly, salicylic acid technology, applied in the preparation of carboxylate, carboxylate, and carboxylate, can solve the problems of lack of environmental protection, energy saving, high efficiency, long carboxylation reaction time, and low product yield. , to achieve the effect of reducing water waste, short response time and less water demand

Inactive Publication Date: 2017-09-08
ZHENJIANG GAOPENG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the currently widely used salicylic acid preparation process, there are many disadvantages of high water demand and long carboxylation reaction time, resulting in low product yield and greatly increased energy consumption. It does not have the characteristics of environmental protection, energy saving and high efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of salicylic acid preparation method of environmental protection high yield is characterized in that, its preparation method comprises the following steps:

[0019] (1) Preparation of sodium phenate powder: under the protection of nitrogen, dissolve phenol in xylene to obtain a xylene solution of phenol, pump the xylene solution of phenol into the reaction kettle, stir and slowly heat until the temperature rises To 50°C, heat 50% sodium hydroxide hot solution into the reactor to carry out salinization reaction. When the temperature reaches 80°C, keep it for 40 minutes. After the salinization reaction is completed, sodium phenolate solution is obtained, and then continue to heat to 130°C , and gradually reduce the pressure in the reactor, heat and reduce pressure and dry, and finally obtain sodium phenate powder;

[0020] (2) Preparation of sodium salicylate solution: maintain the temperature of sodium phenate powder in step (1) at 100°C, and simultaneously feed 0...

Embodiment 2

[0024] A kind of salicylic acid preparation method of environmental protection high yield is characterized in that, its preparation method comprises the following steps:

[0025] (1) Preparation of sodium phenate powder: under the protection of nitrogen, dissolve phenol in xylene to obtain a xylene solution of phenol, pump the xylene solution of phenol into the reaction kettle, stir and slowly heat until the temperature rises To 55°C, heat 50% sodium hydroxide hot solution into the reactor to carry out salinization reaction. When the temperature reaches 80°C, keep it for 45 minutes. After the salinization reaction is completed, sodium phenolate solution is obtained, and then continue to heat to 135°C , and gradually reduce the pressure in the reactor, heat and reduce pressure and dry, and finally obtain sodium phenate powder;

[0026] (2) Preparation of sodium salicylate solution: maintain the temperature of sodium phenate powder in step (1) at 100°C, and simultaneously feed 0...

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Abstract

The invention relates to a green and environment-friendly preparation method for salicylic acid with a high yield. The preparation method comprises the following steps: 1, preparing sodium phenate powder; 2, preparing a sodium salicylate solution; and 3, preparing a finished product salicylic acid. Compared with previous salicylic acid preparation processes, the water demand is relatively small, so that water resource waste is greatly reduced; sodium phenate is quickly dried, so that resinification and coloring of sodium phenate can be effectively avoided, and the product yield of salicylic acid is greatly increased; meanwhile, the carboxylation reaction time is short, the reaction product is higher in purity while the energy consumption is reduced, and the product yield of salicylic acid is increased again. In conclusion, the green and environment-friendly preparation method for salicylic acid with the high yield, provided by the invention, has the characteristics of being environment-friendly, water-saving, energy-saving, efficient and high in yield.

Description

technical field [0001] The invention relates to a production and preparation method of salicylic acid, in particular to an environment-friendly and high-yield preparation method of salicylic acid. Background technique [0002] Salicylic acid, whose chemical name is o-hydroxybenzoic acid, also known as salicylic acid, is found in nature in willow bark, white pearl leaves, sweet birch and many other plants. Salicylic acid has the functions of clearing heat, detoxifying and sterilizing, and now it is mainly used as a raw material in the pharmaceutical industry for the preparation of drugs such as aspirin, sodium salicylate, salicylamide, Zhitongling, phenyl salicylate, and schistosomiasis-67 . It is an important raw material for fine chemicals such as medicine, dyestuff, rubber industry, resin, spices, and pesticides. It is widely used in the manufacture of antipyretic and analgesic products, direct dyes, insecticides, flavoring agents and ultraviolet absorbers. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C65/10C07C51/15C07C51/41C07C51/02C07C37/66C07C39/235
CPCC07C51/02C07C37/66C07C51/15C07C51/412C07C39/235C07C65/10
Inventor 王成栋王成慧
Owner ZHENJIANG GAOPENG PHARMA
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