Production raw material of thiabendazole and preparation technology of production raw material
A preparation process, the technology of thiabendazole, applied in the direction of organic chemistry, etc., can solve the problems of excessive pH value adjustment, affecting product conversion rate and quality, and insufficient raw material ratio, so as to ensure the pH value and quality assurance Effect
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[0021] Example one
[0022] A raw material for the production of thiabendazole, which mainly includes lactic acid, o-phenylenediamine, acetone, inorganic acid, potassium permanganate, bromine, ethyl acetate, formamide and phosphorus pentasulfide; wherein the lactic acid and o-phenylenediamine The molar ratio is 1: 1.17; the ratio of ethyl acetate, formamide and phosphorus pentasulfide is 2:1:1.
[0023] The specific preparation process is as follows:
[0024] (1) Divide the lactic acid and o-phenylenediamine mixed in proportion into multiple parts, add them to different reaction vessels, and carry out condensation reaction with equal parts of hydrochloric acid aqueous solution. After the reaction is completed, adjust the pH value, and remove the 2-α-hydroxyethylbenzimidazole obtained in the containers with the maximum and minimum pH values, and keep the 2-α-hydroxyethylbenzene obtained in the remaining containers;
[0025] (2) The multiple parts of 2-α-hydroxyethylbenzimidazole obtai...
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[0029] Example two
[0030] A raw material for the production of thiabendazole, which mainly includes lactic acid, o-phenylenediamine, acetone, inorganic acid, potassium permanganate, bromine, ethyl acetate, formamide and phosphorus pentasulfide; wherein the lactic acid and o-phenylenediamine The molar ratio is 1: 1.17; the ratio of ethyl acetate, formamide and phosphorus pentasulfide is 2:1:1.
[0031] The specific preparation process is as follows:
[0032] (1) Divide the lactic acid and o-phenylenediamine mixed in proportion into multiple parts, add them to different reaction vessels, and conduct condensation reaction with an equal part of the hydrochloric acid aqueous solution. After the reaction is completed, adjust the pH in the different vessels. Value, and remove the 2-α-hydroxyethylbenzimidazole obtained in the container with the maximum and minimum pH value, and keep the 2-α-hydroxyethylbenzene obtained in the remaining containers;
[0033] (2) The multiple parts of 2-α-hyd...
Example Embodiment
[0037] Example three
[0038] A raw material for the production of thiabendazole, which mainly includes lactic acid, o-phenylenediamine, acetone, inorganic acid, potassium permanganate, chlorine, ethyl acetate, formamide and phosphorus pentasulfide; wherein said lactic acid and o-phenylenediamine The molar ratio is 1: 1.17; the ratio of ethyl acetate, formamide and phosphorus pentasulfide is 2:1:1.
[0039] The specific preparation process is as follows:
[0040] (1) Divide the lactic acid and o-phenylenediamine mixed in proportion into multiple parts, add them to different reaction vessels, and conduct condensation reaction with an equal part of the hydrochloric acid aqueous solution. After the reaction is completed, adjust the pH in the different vessels. Value, and remove the 2-α-hydroxyethylbenzimidazole obtained in the container with the maximum and minimum pH value, and keep the 2-α-hydroxyethylbenzene obtained in the remaining containers;
[0041] (2) The multiple parts of 2-α...
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