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Environmentally-friendly clean technologic production method of highly pure hydantoin

A production method, the technology of hydantoin, applied in the field of high-purity hydantoin in the field of environmentally friendly and clean production, can solve the problems that the product quality is difficult to reach food grade and pharmaceutical grade, the environmental protection problems in the production process are not completely solved, and the production cost remains high. Reduce equipment investment, improve economic and social benefits, and reduce energy consumption

Inactive Publication Date: 2015-09-02
李宽义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] For the above various production methods of hydantoin, there are defects such as low product yield, low product quality, high production cost, and incomplete solution to environmental protection problems in the production process.
In particular, there are always impurities that are difficult to handle in the product, and these impurities make it difficult for the quality of the product to reach food grade and pharmaceutical grade, so the process for producing hydantoin still has great limitations

Method used

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  • Environmentally-friendly clean technologic production method of highly pure hydantoin
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  • Environmentally-friendly clean technologic production method of highly pure hydantoin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The purified hydrocyanic acid gas is absorbed by 37% formaldehyde solution to prepare 400g / l hydroxyacetonitrile aqueous solution; ammonia, carbon dioxide, and water are used in a molar ratio of 1:1:15 to prepare an ammonia-containing carbonated water reaction system.

[0046] Add 3500L ammonia-containing carbonated water reaction system to a 5000L pressure reaction kettle. When preheated to 80℃, use a pressure pump to inject 500L of hydroxyacetonitrile aqueous solution at room temperature into the reaction system for reaction, and slowly increase the reaction in 1 hour. The temperature of the system reaches 100°C. When the pressure of the reaction system exceeds 5.0Mpa, slowly release the pressure. After 2 hours of heat preservation and reaction, release the pressure to normal pressure. The carbon dioxide gas released by pressure release contains trace amounts of ammonia and can be directly recovered; The reaction liquid was obtained, and the conversion rate of hydroxyacet...

Embodiment 2

[0048] The purified hydrocyanic acid gas is absorbed by 37% formaldehyde solution, and then a 300g / l hydroxyacetonitrile aqueous solution is prepared; ammonia, carbon dioxide, and water are used in a molar ratio of 1:1:10 to prepare an ammonia-containing carbonated water reaction system.

[0049] Add 3550L ammonia-containing carbonated water reaction system into a 5000L pressure reaction kettle, and when preheated to 80℃, use a pressure pump to inject 450L of hydroxyacetonitrile aqueous solution at room temperature into the reaction system for reaction, and slowly increase the reaction in 1 hour The temperature of the system reaches 100°C. When the pressure of the reaction system exceeds 5.0Mpa, slowly release the pressure. After 2 hours of heat preservation and reaction, release the pressure to normal pressure. The carbon dioxide gas released by pressure release contains trace amounts of ammonia and can be directly recovered; The reaction liquid was obtained, and the conversion r...

Embodiment 3

[0051] The purified hydrocyanic acid gas is absorbed by 37% formaldehyde solution to prepare 400g / l hydroxyacetonitrile aqueous solution; ammonia, carbon dioxide, and water are used in a molar ratio of 1:1:15 to prepare an ammonia-containing carbonated water reaction system.

[0052] Add 3400L ammonia-containing carbonated water reaction system to a 5000L pressure reaction kettle. When preheated to 85℃, use a pressure pump to inject 600L of hydroxyacetonitrile aqueous solution at room temperature into the reaction system for reaction, and slowly increase the reaction in 1 hour. The temperature of the system reaches 100°C. When the pressure of the reaction system exceeds 5.0Mpa, slowly release the pressure. After 2 hours of heat preservation and reaction, release the pressure to normal pressure. The carbon dioxide gas released by pressure release contains trace amounts of ammonia and can be directly recovered; The reaction liquid was obtained, and the conversion rate of hydroxyacet...

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Abstract

The purpose of the invention is providing an environmentally-friendly clean technologic production method of highly pure hydantoin. The environmentally-friendly clean technologic production method of highly pure hydantoin comprises the following steps: reacting an initial raw mateiral hydrocyanic acid with formaldehyde to generate hydroxyacetonitrile, reacting hydroxyacetonitrile in a carbonated water system containing ammonia to obtain an aqueous solution of hydantoic acid, carrying out acid hydrolysis to obtain hydantoin crystals, and purifying to obtain a highly pure hydantoin product. The method effectively avoids decomposition and polymerization of hydroxyacetonitrile, well inhibits generation of harmful impurities, realizes a high yield, and allows the purity of the obtained product to be very high; the method reduces the device investment, and well guarantees the operation safety of the whole process; hot water dissolving, heat treatment and hot filtration are adopted in the purifying process, so consumed energy is saved; the above whole technology is a thoroughly environmentally-friendly and clean technology; and the method has lower requirements on raw materials, can fully and comprehensively utilize resources, and plays a very active role in natural environment protection.

Description

Technical field [0001] An environmentally-friendly and clean process production method of high-purity hydantoin, which involves the production method of hydantoin, especially the process method for producing high-purity hydantoin by the hydrocyanic acid method. Hydantoin is an important intermediate for the synthesis of pesticides and medicines, and is an intermediate in organic synthesis The production process of raw materials. Background technique [0002] Hydantoin, also known as hydantoin, is an important basic organic raw material that has a wide range of uses in the pesticide and pharmaceutical industries. The basic preparation routes of hydantoin are mainly as follows: [0003] (1) Urech used alanine sulfate and potassium cyanate for condensation in 1873. This method is called Urech hydantoin synthesis. Alanine can also be replaced by aminoacetic acid or ethyl aminoacetate. [0004] (2) The reaction of acetone cyanohydrin and ammonium carbonate can produce 5,5-dimethylhydan...

Claims

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Application Information

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IPC IPC(8): C07D233/74
Inventor 李宽义朱喜福程文昊曾雯娟龙智白先丽李俊
Owner 李宽义
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