4065-45-6Relevant articles and documents
Preparation method of sun-screening agent 2-hydroxy-4-methoxy-5-sulfo benzophenone
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Paragraph 0052; 0054-0055, (2021/02/06)
The invention provides a preparation method of a sun-screening agent 2-hydroxy-4-methoxy-5-sulfo benzophenone. According to the method, SO3 is used as a sulfonating agent, the process conditions are mild, the reaction process is easy to control, the product selectivity is good, byproducts are few, and the purification process is simple and feasible. Compared with a traditional process, the production of waste acid is greatly reduced, the water content in the product is greatly reduced, acidic impurities are reduced to a great extent, the product quality is further improved, and the method is agreen and environment-friendly process and is beneficial to industrial production.
Synthesis process for 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid
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Paragraph 0011, (2016/11/28)
The invention discloses a synthesis process for 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid. The process comprises the treatment flow: adding 2-hydroxy-4-methoxybenzophenone and a solvent into an enamel reaction kettle, dripping chlorosulfonic acid under the protection of nitrogen with stirring, controlling the temperature of the materials in the kettle to be 20-25 DEG C through jacket water bath cooling and control of the dripping speed of the chlorosulfonic acid, and performing a reaction for 20-25 h; performing centrifugal filtering separation on a product after reaction is finished, washing the product by using a corresponding solvent, and drying the product under the protection of the nitrogen; recycling a hydrogen chloride (HCl) byproduct in an HCl recycling packing tower in a water circulation mode to form a 20%-30% hydrochloric acid aqueous solution, and neutralizing a little hydrogen chloride gas of tail gas by using a solid alkali packing tower; and performing distillation recycling of the solvent by using an atmospheric distillation tower of a solvent distillation recycling system, and recycling 2-hydroxy-4-methoxybenzophenone and 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid from raffinate at the bottom of the kettle.
A composition for lightening skin and hair
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, (2014/10/28)
Suggested is a composition comprising (a) sclareolide and (b1) at least one tyrosinase inhibitor; and/or (b2) at least one sun protection factor; and/or (b3) at least one anti-oxidants; and/or (b4) at least one anti-inflammatory agent; and/or (b5) at least one desquamating agent.