3864-99-1Relevant articles and documents
Preparation method of benzotriazole ultraviolet light absorber
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Paragraph 0179; 0182-0183; 0193, (2021/04/14)
The invention relates to a preparation method of a benzotriazole ultraviolet absorbent. The method comprises the following steps: under the action of a magnesium oxide supported metal catalyst, carrying out transfer hydrogenation reaction on an azo intermediate shown in a formula I and a hydrogen donor to obtain a target product shown in a formula III. The method provided by the invention is small in catalyst dosage, the raw material conversion rate can reach 100%, and the target product selectivity is 90% or above.
A benzo triazole ultraviolet absorbing agent preparation method (by machine translation)
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Paragraph 0062; 0063; 0064; 0065, (2018/06/15)
The invention discloses a benzo triazole ultraviolet absorbing agent preparation method, including the raw material compound and alkali is dissolved in the solvent, is configured to raw material is added to the reaction device; then the Fe3 O4 /Catalyst is added to the raw material liquid in the graphene, access hydrogen, keeping the pressure 0.1 - 5 mpa, temperature 40 - 120 °C; in the reaction process using high performance liquid chromatography to real-time monitoring of the reaction solution, after the reaction, cooling, the restoration of normal pressure and recovering the catalyst after treatment, be benzo triazole ultraviolet absorbent. The method of this invention simple process, environmental protection, low cost, mild reaction conditions, product yield and quality is high, is suitable for industrial production, Fe used therein3 O4 /Graphene catalyst economic and environmental protection, stable properties, is recycled. (by machine translation)
Preparation method of ultraviolet absorbent containing chlorobenzotriazole
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Paragraph 0072-0097, (2017/07/20)
The invention relates to a preparation method of an ultraviolet absorbent containing chlorobenzotriazole. Azobenzene, sodium hydroxide and toluene are stirred and mixed, the temperature is controlled to 60-80 DEG C, water and hydrazine are dropwise added at a constant speed, heat preservation reaction is performed after the completion of dropping, hydrochloric acid is added to perform neutralization to reach the pH of 6-7 after completion of hydrazine reduction, washing is performed, and an oil phase, namely nitrogen oxide, is obtained; the nitrogen oxide solution, alkali, a framework nickel catalyst and a catalyst promoter sodium phosphite are put into an autoclave, and hydrogen is led to perform constant-pressure constant-temperature reaction after nitrogen displacement; after reaction is completed, reaction liquid filtration and washing are performed, an organic phase evaporated solvent is obtained, and recrystallization, filtration and drying are conducted on the methanol and toluene mixed solvent to obtain the ultraviolet absorbent containing chlorobenzotriazole. Compared with an existing synthetic method, the preparation method has the advantages of being good in reaction selectivity, inhibiting a dechlorination phenomenon in the hydrogenation process, producing few by-products and the like and meanwhile does not produce wastewater containing zinc and aluminum, subsequent processing is simple, and the 'three wastes' problem produced in the secondary reduction process is solved.