Novel process for preparing sun-screening agent 2-hydroxy-4-n-octyloxy benzophenone

Abstract

The invention discloses a novel process for preparing a sun-screening agent 2-hydroxy-4-n-octyloxy benzophenone. According to the process, 2,4-dihydroxy benzophenone is prepared, and 2,4-dihydroxy benzophenone and 1-chloro-n-octane are used as raw materials, wherein the prepared 2,4-dihydroxy benzophenone is simple in method, has no need of posttreatment and can be directly used as a reaction rawmaterial for subsequent reaction, and the energy consumption is reduced from the source; 1-chloro-n-octane is taken as an alkylation reagent, inorganic base is taken as a catalyst, solvents are addedfor reaction, and the yield of the obtained product 2-hydroxy-4-octyloxybenzophenone is high and can reach 90% or above. According to the method, the raw material cost is reduced, the problem of industrial wastewater at present is solved, in addition, the whole process is mild in condition, few in three wastes, high in yield and good in product quality, the use requirements of the cosmetic industry are met, the technological process is simple to operate and easy to realize, the intermediate reaction process is simple and easy to control, and industrial production can be realized.

Description

technical field

[0001] The invention belongs to the field of chemical technology, and in particular relates to a technology of sunscreen agent 2-hydroxy-4-n-octyloxybenzophenone. Background technique

[0002] Because the sun's rays contain a large amount of ultraviolet light harmful to colored objects, with a wavelength of about 290-460 nanometers, these harmful ultraviolet light will eventually decompose and fade the color molecules through chemical oxidation and reduction, and use sunscreen to protect the protected objects. Objects and human skin can effectively prevent or weaken its damage to color. Sunscreen is a light stabilizer that can absorb ultraviolet rays from sunlight and fluorescent light sources without changing itself.

[0003] 2-Hydroxy-4-n-octyloxybenzophenone (alias: ultraviolet absorber UV-531) is a kind of sunscreen agent, and its molecular formula is C 21 h 26 o 3 , melting point is 47-49°C, color is light yellow or white crystalline powder, can stro...

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