Industrial preparation method of hydroxy acetonitrile

A hydroxyacetonitrile, industrial technology, applied in the field of industrial preparation of hydroxyacetonitrile, can solve the problems of impurities, polyformaldehyde, hydrolysis, condensation, esterification, etc., and achieve the effect of avoiding other by-products

Inactive Publication Date: 2018-11-13
FUSHUN SHUNTE CHEM
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the synthesis principle and experimental operation of hydrocyanic acid hydroxymethylation method have been thoroughly studied, the following problems still exist in the industrial production process: the direct reaction between industrial formaldehyde and hydrocyanic acid often cannot be completely reacted, resulting in the production of hydroxyacetonitrile There are more...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0016] The industrial preparation method of hydroxyacetonitrile mainly comprises following processing steps:

[0017] (1) After the temperature of the 3000kg formaldehyde solution drops to 20°C, the pH is maintained at 6.5~7.5, and hydrogen cyanide is added dropwise. The weight content of the formaldehyde solution is 37%, and the weight content of the hydrogen cyanide is 0.69mg / ml; Control the dripping flow rate of hydrocyanic acid, and maintain and control the reaction temperature at 18~23°C;

[0018] (2) The amount of hydrocyanic acid added is 1000Kg. After the addition of hydrocyanic acid is completed, under stirring, continue to maintain the temperature at 18~23°C, stir for 20~30 minutes, and then take samples for analysis. The hydroxyacetonitrile test meets the qualified standards : The weight content of hydroxyacetonitrile is not less than 50%, and CHO - The weight content does not exceed 0.2%, and CN - The weight content does not exceed 0.25%;

[0019] (3) In the fin...

specific Embodiment 2

[0021] The industrial preparation method of hydroxyacetonitrile mainly comprises following processing steps:

[0022] (1) After the temperature of the 3000kg formaldehyde solution drops to 20°C, the pH is maintained at 6.5~7.5, and hydrogen cyanide is added dropwise. The weight content of the formaldehyde solution is 37%, and the weight content of the hydrogen cyanide is 0.69mg / ml; Control the dripping flow rate of hydrocyanic acid, and maintain a controlled reaction temperature of 18~23°C; the catalyst anhydrous sodium sulfite is used in the reaction process of formaldehyde solution and hydrocyanic acid.

[0023] (2) The amount of hydrocyanic acid added is 1000Kg. After the addition of hydrocyanic acid is completed, under stirring, continue to maintain the temperature at 18~23°C, stir for 20~30 minutes, and then take samples for analysis. The hydroxyacetonitrile test meets the qualified standards : The weight content of hydroxyacetonitrile is not less than 50%, and CHO - The...

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PUM

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Abstract

The invention relates to an industrial preparation method of hydroxy acetonitrile. A formaldehyde solution is enabled to react with hydrocyanic acid at the temperature of 18-23 DEG C so as to obtain afinished hydroxy acetonitrile material, sulfuric acid is added in the finished hydroxy acetonitrile material to adjust a PH (potential of hydrogen) value to 1-2, the finished hydroxy acetonitrile material is cooled through a medium, and finally the finished hydroxy acetonitrile material is stored after being cooled to below 13 DEG C so as to avoid generation of by-products. In the reaction process of the formaldehyde solution and the hydrocyanic acid, anhydrous sodium sulfite as a catalyst is utilized to beneficially increase conversion rate of the reaction, qualified formaldehyde hydroxy acetonitrile is utilized as a solvent to beneficially increase the concentration of the final hydroxy acetonitrile product and to increase the conservation rate.

Description

technical field [0001] The invention belongs to the technical field of organic chemical production, and in particular relates to an industrial preparation method of hydroxyacetonitrile. Background technique [0002] Hydroxyacetonitrile is a colorless to light yellow liquid, highly toxic, can volatilize a mixed gas containing hydrocyanic acid in an open container, can dissolve some metals to form complexes, and is soluble in ethanol and ether. It is widely used in dyes, medicines, pesticides and other fields. [0003] The preparation methods of hydroxyacetonitrile mainly include acetonitrile oxidation method and hydrocyanic acid hydroxymethylation method. The specific process of hydrocyanic acid methylolation method is: liquid formaldehyde and a certain concentration of hydrocyanic acid are directly subjected to addition reaction in normal pressure equipment to generate hydroxyacetonitrile in an appropriate acid-base environment. Although the synthesis principle and experim...

Claims

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Application Information

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IPC IPC(8): C07C253/00C07C255/12
CPCC07C253/00C07C255/12
Inventor 田玺谢宜峰吴杏伟
Owner FUSHUN SHUNTE CHEM
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