87-90-1Relevant articles and documents
Preparation method of omeprazole midbody
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Paragraph 0069-0075, (2019/10/22)
The invention relates to a preparation method of 2-chloromethyl-3,5-dimethyl-4-methoxypyridine shown in a chemical structural formula I. The method is characterized by comprising the steps of a catalytic hydrogenation reaction, wherein Raney nickel or Pd/C is selected as a catalyst; a chlorination reaction, wherein YCln is selected from N-chloroacetamides or N-chlorosuccinimide or 1,3-dichloro-5,5-dimethylhydantoin or dichlord isocyanurice acid or symclosene; n is selected from 3 or 2 or 1; m is selected from 0 or 1 or 2.
Preparation method of trichloroisocyanuric acid
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Paragraph 0034-0069, (2017/10/26)
The invention discloses a preparation method of trichloroisocyanuric acid and belongs to the field of production of chemical products. The preparation method of the trichloroisocyanuric acid comprises the following steps: selecting cyanuric acid and dichlorine monoxide as raw materials, and selecting water as a solvent to carry out chlorination reaction, so as to obtain target product trichloroisocyanuric acid. According to the preparation method of the trichloroisocyanuric acid, disclosed by the invention, the water is selected as the solvent, so an obtained product is insoluble in water; after the reaction is finished, the operation of separating the product is simple, and technical essentials are easily grasped; moreover, a mother solution can be recycled without undergoing treatment, and the trichloroisocyanuric acid is clean and pollution-free and benefits to reducing the production cost.
A two-stage continuous chlorination method for production of trichloro isocyanuric acid
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Paragraph 0027-0034, (2017/03/28)
The invention discloses a method for producing trichloro-isocyanuric acid by virtue of two-stage continuous chlorination. A production process of the method comprises first-stage chlorination reaction and second-stage chlorination reaction; an excessive amount of chlorine is fed into a second-stage reaction kettle, a cyanuric acid trisodium salt solution is continuously added into a first-stage reactor, the excessive amount of chlorine in the second-stage reaction kettle is sucked into the first-stage reactor for chlorination reaction by virtue of an ejection pump of a first-stage reaction system, and a reaction liquid overflows into the second-stage reaction kettle to continuously react to generate trichloro-isocyanuric acid. The chlorination reaction degree of materials inside the one-stage reactor and the chlorine feeding amount of the second-stage reaction kettle are controlled by virtue of the reaction temperature of the first-stage reactor. The method is small in amount of chlorination mother liquid and high in reaction efficiency, and a gas discharged from the first-stage reactor is free of chlorine. The time that the material is retained in the chlorination reaction system is short, so that side reaction can be reduced, the effective chlorine of a product is kept greater than 90%, and the yield is more than 86%.