Vitamin D3 preparation method and device

A technology of vitamins and equipment, applied in the field of vitamins, can solve the problems of large ultraviolet absorption, many side reactions of polymerization, and no consideration of use, etc., and achieve the effect of high content, less side reactions of polymerization, and avoid deterioration
CN101381336BActive Publication Date: 2012-07-04ZHEJIANG NHU CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG NHU CO LTD
Publication Date
2012-07-04

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Abstract

The invention discloses a method for preparing vitamin D3 and used equipment. In the prior method, a solvent must be replaced during the crystallization process of the post-treatment, and the heating time is long, which affect the content of a final product. A solvent used by the method in a photochemical reaction is a mixed solvent consisting of a high melting point solvent and a low melting point solvent; an obtained photochemical reaction liquid is subjected to freezing crystallization and filtering post-treatment after the photochemical reaction is finished; and crude vitamin D3 oil is obtained after filtrate is concentrated; after a filter cake is heated and dissolved, 7-dehydrocholesterol and the low melting point solvent which is concentrated from the filtrate are added to serve as raw materials for the photochemical reaction; the high melting point solvent is alcoholic solvents or hydrocarbon solvents with melting points of between 10 DEG C below zero and 10 DEG C, and the low melting point solvent is alcohol solvents with melting points less than or equal to 50 DEG C below zero. The vitamin D3 obtained by the method has high content and less polymerization side reactions, does not need to replace the solvent during the post-treatment process, and has good quality.
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Description

Technical field

[0001] The invention relates to the field of vitamins, in particular to a vitamin D obtained by photochemical reaction of 7-dehydrocholesterol 3 The preparation method and equipment used. Background technique

[0002] Vitamin D 3 The synthesis of 7-dehydrocholesterol is usually used to dissolve 7-dehydrocholesterol in a suitable solvent, and carry out the photochemical reaction through a photochemical reactor. Due to the self-absorption effect of the 7-dehydrocholesterol solution, the concentration of the reaction solution cannot be too high (usually less than 5% by weight); at the same time, a too high reaction concentration will increase the viscosity of the reaction solution and reduce the mass transfer effect. Formed by-products of irradiation. Usually get high vitamin D 3 The content must be a low-concentration reaction solution, a low-viscosity solvent, and a low conversion rate (not more than 40%). Sometimes a temperature slightly lower than the boiling po...

Claims

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