- A method for producing the active MICA environmental protection (by machine translation)
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A active MICA environment-friendly production method, comprises the following steps: oximation, alkylation, chlorinated, ring, process for preparing the intermediate. The invention realizes the recycled, thereby reducing the cost, reduces the amount of waste and waste water; will be S1 in the recrystallization of the sodium acetate as by-product, for S4 in the ring, reducing the waste water and its salt content; in S2 in, now process generally utilizes a potassium carbonate to provide alkaline environment, general in the consumption of 2 more than one equivalent, shortcomings are as follows: a, in the salt in the reaction process too big stirring strenous, b, post-processing needs a large amount of water dissolved inorganic salt, form a large amount of high salt waste water, is changed into the organic base after the solid salt in the reaction process is greatly reduced, post-processing of organic base recycling, reducing the cost and amount of waste water; S3 using batch feeding mode, can be reduced under the same conversion rate, the amount of sulfonyl chloride; S5 recycling reaction generated by-product 2 - mercaptobenzothiazole, recycled in the synthesis of disulphide diphenyl thiazole. (by machine translation)
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Paragraph 0041
(2018/04/01)
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