- Preparation method of omeprazole midbody
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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.
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Paragraph 0069-0075
(2019/10/22)
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- Preparation method of 2-chloro-5-chloromethylpyridine
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The invention relates to the field of chemical synthesis, particularly a preparation method of 2-chloro-5-chloromethylpyridine. The preparation method comprises the following step: carrying out cyclization reaction on 2-chloro-2-chloromethyl-4-cyanobutyraldehyde and cyanuric chloride to obtain the 2-chloro-5-chloromethylpyridine. The preparation method provided by the invention has the advantages of low production cost, high product quality, high yield and the like. Besides, the byproduct sodium cyanurate of the preparation method can be treated to prepare thetrichloroisocyanuric acid superior product, thereby further enhancing the economic benefits.
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Paragraph 0097-0117
(2017/07/19)
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- Preparation method of trichloroisocyanuric acid
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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.
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Paragraph 0034-0069
(2017/10/26)
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- Method for preparing trichloroisocyanuric acid by utilizing solvent process
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The invention belongs to the technical field of preparation of trichloroisocyanuric acid and discloses a method for preparing trichloroisocyanuric acid by utilizing a solvent process. According to the technical scheme, the method for preparing the trichloroisocyanuric acid by utilizing the solvent process comprises the following steps: by taking a solvent as a reaction medium, adding trisodium cyanurate into the solvent, introducing chlorine, carrying out chlorination reaction at the reaction temperature of 0-50 DEG C, carrying out centrifugal separation on reacted materials to obtain sodium chloride, distilling centrifugal mother liquid in a reaction kettle, condensing and recycling the solvent, wherein the obtained concentrate is namely the trichloroisocyanuric acid. The method disclosed by the invention has the advantages that the solvent is taken as the medium, water does not need to be used in a reaction process, water resource is greatly saved, and energy consumption in aftertreatment of mother liquor in an aqueous phase process is greatly reduced.
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Paragraph 0007; 0008; 0009; 0010; 0011
(2017/05/12)
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- A two-stage continuous chlorination method for production of trichloro isocyanuric acid
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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%.
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Paragraph 0027-0034
(2017/03/28)
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- A method for producing trichloro isocyanuric acid powder mechanical device (by machine translation)
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The utility model discloses a method for producing trichloro isocyanuric acid powder mechanical device, this device belongs to the field of disinfectants; including: chemical reaction kettle (1), filter press (2), the dryer (3), disintegrator (4), packaging machine (5); chemical reaction kettle (1) is provided with a 1st raw material inlet (6), chemical reaction kettle (1) and the filter (2) is arranged between the pump and the pipeline 1st material (7), filter press (2) provided with a washing water inlet (8), sewage outlet (9), filter press (2) and dryer (3) is provided with a 1st between the conveyor (10), the dryer (3) and the disintegrator (4) arranged between the 2nd conveyor (11), disintegrator (4) and packaging machine (5) is arranged between the 3rd conveyor (12), packaging machine (5) is provided with a packaging bag inlet (13), a product outlet (14). (by machine translation)
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Paragraph 0014-0016
(2017/06/14)
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- Process for producing trichloroisocyanuric acid from selected symmetrical triazines
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Trichloroisocyanuric acid is produced by the reaction of a symmetrical triazine compound selected from the group consisting of ammelide, chlorosubstituted ammelide, ammeline and chlorosubstituted ammeline, with dichlorine monoxide in a gaseous mixture with a diluent gas. The gaseous mixture is comprised of from about 1 to about 30 percent by volume of dichlorine monoxide.
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