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Salicylic acid preparation method

A technology of salicylic acid and sodium salicylate, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of low preparation rate of salicylic acid, waste of energy and the like

Inactive Publication Date: 2019-08-20
ZHENJIANG GAOPENG PHARMA
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation rate of salicylic acid produced by existing salicylic acid is low, and the waste water produced by the preparation of salicylic acid contains a large amount of phenol and salicylic acid, and the waste water is directly treated, resulting in waste of energy

Method used

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Embodiment Construction

[0012] The following specific embodiments will further illustrate the present invention.

[0013] A preparation method of salicylic acid, its preparation method specifically comprises the following steps:

[0014] Step 1, preparing sodium phenate powder, adding phenol and slightly excess 50% sodium hydroxide solution into the autoclave, stirring evenly, then slowly heating to 130°C for reaction. Open the vacuum pump, carry out vacuum drying to the liquid in the autoclave, obtain dry powdery sodium phenate;

[0015] Step 2, prepare sodium salicylate solution, cool the reaction vessel to 100°C, feed 0.5-0.6Mpa of carbon dioxide, add distilled water into the autoclave after 5 minutes of carbon dioxide, stir continuously and heat to 160-170°C, After reacting for 3-3.5 hours, turn on the vacuum pump for vacuum concentration to obtain a 30% sodium salicylate solution;

[0016] Step 3, prepare industrial salicylic acid, add sodium salicylate solution into the decolorization tank, a...

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Abstract

The invention provides a salicylic acid preparation method. The preparation method specifically comprises the following steps: step 1, preparing sodium phenoxide powder; step 2, preparing a sodium salicylate solution; step 3, preparing industrial salicylic acid; step 4, preparing salicylic acid; and step 5, recovering sodium salicylate. Salicylic acid and phenol are recovered from wastewater produced by salicylic acid preparation, and the recovery rate by using NDA-800 ultra-high cross-linked adsorption resin is high; purity of the recovered phenol and salicylic acid is high, the recovered phenol and salicylic acid can be directly produced and recycled, and the use is not influenced. The NDA-800 ultra-high cross-linked adsorption resin can be repeatedly used after desorption, and the recycled wastewater can reach the emission standard after simple treatment.

Description

technical field [0001] The invention relates to the technical field of production and processing of salicylic acid, in particular to a preparation method of salicylic acid. Background technique [0002] Salicylic acid is a fat-soluble organic acid. Salicylic acid is used in clinical trials to reduce the risk of long-term heart disease in diabetic patients. The latest research is to require all type 1 diabetics who already have heart disease to take it, and salicylic acid treatment is also recommended as a way to prevent complications. However, the production rate of salicylic acid produced by the existing salicylic acid is low, and the waste water produced by the preparation of salicylic acid contains a large amount of phenol and salicylic acid, and the waste water is directly treated, resulting in waste of energy. Contents of the invention [0003] In order to solve the problems in the prior art, the invention provides a preparation method of salicylic acid. [0004] T...

Claims

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Application Information

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IPC IPC(8): C07C51/15C07C51/47C07C65/10C07C37/82C07C39/04
CPCC07C37/82C07C51/15C07C51/47C07C65/10C07C39/04
Inventor 王成栋王成慧李冕
Owner ZHENJIANG GAOPENG PHARMA
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