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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Embodiment 1
[0022] A raw material for the production of thiabendazole, mainly including 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] Concrete 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 containers, and carry out condensation reaction with equal parts of hydrochloric acid aqueous solution. pH 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;
[0025] (2) Multiple parts of 2-α-hydroxyethylbenzimidazole obtained in step (1) were filtered and dried several times, and finally mi...
Embodiment 2
[0030] A raw material for the production of thiabendazole, mainly including 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] Concrete preparation process is as follows:
[0032] (1) Divide the mixed lactic acid and o-phenylenediamine into multiple parts, add them to different reaction containers, and carry out condensation reaction with equal parts of hydrochloric acid aqueous solution. After the reaction is completed, adjust the pH in different containers respectively value, and remove the 2-α-hydroxyethylbenzimidazole obtained in the container with the pH value maximum and minimum value, and keep the 2-α-hydroxyethylbenzene obtained in the remaining containers;
[0033] (2) Multiple parts of 2-α-hydroxyethylbenzimidazole o...
Embodiment 3
[0038] A raw material for the production of thiabendazole, mainly including lactic acid, o-phenylenediamine, acetone, inorganic acid, potassium permanganate, chlorine, 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.
[0039] Concrete preparation process is as follows:
[0040] (1) Divide the mixed lactic acid and o-phenylenediamine into multiple parts, add them to different reaction containers, and carry out condensation reaction with equal parts of hydrochloric acid aqueous solution. After the reaction is completed, adjust the pH in different containers respectively value, and remove the 2-α-hydroxyethylbenzimidazole obtained in the container with the pH value maximum and minimum value, and keep the 2-α-hydroxyethylbenzene obtained in the remaining containers;
[0041] (2) Multiple parts of 2-α-hydroxyethylbenzimidazole ...
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