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Method for refining benzoic acid

A technology of benzoic acid and crude benzoic acid, applied in the field of benzoic acid, can solve problems such as affecting normal use and insufficient purity, and achieve the effects of ensuring normal use, improving purity and simple structure

Inactive Publication Date: 2019-05-10
江苏顺丰化工有限公司
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Problems solved by technology

The purity of existing benzoic acid is not enough, affecting its normal use

Method used

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Embodiment Construction

[0019] The preferred embodiments of the present invention are given below to describe the technical solution of the present invention in detail.

[0020] The refining method of benzoic acid of the present invention comprises the following steps:

[0021] Step 1, add raw material, add toluene, solvent, catalyst in reaction container, stir;

[0022] Step 2, heat reaction, carry out oxidation reaction, reaction time is 11~12 hours, reaction temperature is 120~130 ℃, the obtained crude benzoic acid solution;

[0023] Step 3, cooling, the thick benzoic acid solution that step 2 obtains is cooled to room temperature;

[0024] Step 4, filtering, the crude benzoic acid solution obtained in step 3 is filtered to remove catalyst and impurities;

[0025] Step 5, distillation, the crude benzoic acid solution after filtering is distilled, obtains the higher benzoic acid solution of density;

[0026] Step 6, crystallization, the benzoic acid solution is crystallized in the crystallizatio...

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Abstract

The invention discloses a method for refining benzoic acid. The method for refining the benzoic acid comprises the following steps: step 1, adding raw materials, adding toluene, a solvent and a catalyst into a reaction container, and stirring; step 2, heating for reaction, and carrying out oxidation reaction for 11 to 12 hours at 120 to 130 DEG C to obtain a crude benzoic acid solution; step 3, cooling: cooling the crude benzoic acid solution obtained in step 2 to room temperature; step 4, filtering: filtering the crude benzoic acid solution obtained in step 3 to remove the catalyst and impurities. According to the invention, distillation, filtration and the like are used, and other substances other than the system components are not needed, so that no new impurities are introduced, and the purity of benzoic acid is improved.

Description

technical field [0001] The present invention relates to a kind of benzoic acid, relate in particular to a kind of refining method of benzoic acid. Background technique [0002] Benzoic acid, also known as benzoic acid, is a compound formed by replacing one hydrogen on the benzene ring with a carboxyl group (-COOH). It is scale-like or needle-like crystals with the smell of benzene or formaldehyde at room temperature. Its vapor is highly irritating and can easily cause coughing after inhalation. Slightly soluble in water, easily soluble in organic solvents such as ethanol and ether. The purity of existing benzoic acid is not enough, which affects its normal use. Contents of the invention [0003] The technical problem to be solved by this invention is to provide a kind of refining method of benzoic acid, it improves the purity of benzoic acid, guarantees its normal use. [0004] The present invention solves the problems of the technologies described above through th...

Claims

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Application Information

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IPC IPC(8): C07C51/16C07C51/42C07C51/43C07C51/44C07C63/06
Inventor 孙新兵丁力
Owner 江苏顺丰化工有限公司
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