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Process for preparing guanidine hydrochloride

Inactive Publication Date: 2002-12-18
方建文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current production process, the purity of the obtained product is not very high, but in use, the purity requirement of guanidine hydrochloride is very high in some occasions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The preparation method of guanidine hydrochloride has following technological process:

[0017] A, melting, putting the dicyandiamide and ammonium chloride that weight ratio is 1: 1.27 into reactor, carry out melting reaction at 170~230 ℃, get guanidine hydrochloride crude product;

[0018] B, dissolving, at normal temperature, the guanidine hydrochloride crude product is dissolved in water in a ratio of 1:1, and the solution is added with ammonium-removing salt base determined according to the ammonium salt content in the guanidine hydrochloride crude product;

[0019] c. Filtration, the impurities such as raw materials and reaction by-products are removed by filtration;

[0020] d, dehydration, the mother liquor after filtering is dehydrated at high temperature;

[0021] e, crystallization, supersaturated solution cooling, concentrated crystallization, obtained high-purity guanidine hydrochloride;

[0022] f. Add dicyandiamide to the guanidine hydrochloride after st...

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PUM

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Abstract

The preparation method of guanidine carbonate includes the following steps: melting, dissolving, filtering, dewatering and crystallizing so as to obtain the invented product with high purity. Its quality if good, and its purity can be up to 99.9%.

Description

Technical field [0001] The present invention relates to a kind of production method of chemical product, especially the preparation method of guanidine hydrochloride. Background technique [0002] Guanidine hydrochloride, chemical name carbamidine hydrochloride, its structural formula is: HN=C(NH 2 ) 2 HCl, the molecular formula is: CH 6 ClN 3 . It is a white or slightly yellow lump, with a melting point of 181-183°C and a relative density of 1.354. At 25°C, the pH value of a 4% aqueous solution is 6.4. At 20°C, the solubility in 100g of the following solution is: 200g / 100g of water, 76g / 100g methanol, 24g / 100g ethanol, almost insoluble in acetone, benzene and ether. It can be used as an intermediate in medicine, pesticide, dye and other organic synthesis. It is an important raw material for the manufacture of sulfadiazine, sulfamethazine, sulfamethazine and other drugs and folic acid. It can also be used as an antistatic agent for synthetic fibers. At present, dicyand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C277/02C07C279/02
Inventor 曹继龙方建文
Owner 方建文
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