Synthesis method of canthaxanthin

The invention discloses a synthetic method of canthaxanthin, beta-carotene is used as a raw material, chlorate is added in the presence of an oxidizing agent for reaction, and the mass of a polyhydroxy intermediate in the reaction process is 5-15% of the mass of the generated canthaxanthin; the problems that in the C40 route reaction process, water-oil phase emulsification is serious, metal ions in the product exceed the standard, the all-trans content is reduced in the storage process, and caking is serious due to the fact that the product is prone to dimerization are solved. 本发明公开了一种角黄素的合成方法，以β-胡萝卜素为原料，在氧化剂存在下加入氯酸盐进行反应，其中反应过程中多羟基中间体的质量为生成的角黄素质量的5-15％；本发明解决了C40路线反应过程中水油相乳化严重，产品中金属离子超标，存储过程中全反式含量降低，产品易二聚导致结块严重等问题。