Synthesis method of 4,4'-dihydroxybiphenyl

Abstract

The invention provides a synthesis method of 4,4'-dihydroxybiphenyl. Biphenyl is used as an initial raw material undergoes a Friedel-Crafts alkylation reaction to obtain 4,4'-dicyclopentylbiphenyl or4,4'-dicyclohexylbiphenyl, an oxidation reaction is carried out to obtain hydroperoxide, and then the hydroperoxide is subjected to a cracking reaction to prepare the target product 4,4'-dihydroxybiphenyl. The whole synthesis method is high in selectivity, high in yield, convenient to operate and environmentally friendly, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a synthesis method of 4,4'-dihydroxybiphenyl. Background technique [0002] 4,4'-Dihydroxybiphenyl is an important organic intermediate and has a wide range of uses in the chemical industry. It can be used as an antioxidant for plastics, a stabilizer for dyes and an anti-aging agent for rubber, etc. It can also be used to make excellent composite materials and liquid crystal polymers. In recent years, the world has gradually banned the use of bisphenol A in the production of baby-related plastic products, and 4,4'-dihydroxybiphenyl has become the best substitute for bisphenol A. [0003] At present, the methods for large-scale industrial production of 4,4'-dihydroxybiphenyl mainly include: [0004] 1. Preparation of 4,4'-dihydroxybiphenyl from biphenyl and its derivatives by sulfonated alkali fusion, refer to US Patent US6410238, [0005] [0006] Although this me...

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Problems solved by technology

[0016] Although this method has a simple process and less waste, the catalyst preparation process in the early stage is complicated, which affects the overall economic benefits.

[0017] It can be seen from the above that at present, high-purity 4,4'-dihydroxybiphenyl cannot be produced in large quantities in China, and its use mainly depends on imports from the United States. The existing domestic technologies have the following problems:

[0018] First, the use of strong acid, strong alkali and high temperature reaction conditions not only requires high energy consumption and high equipment requirements, but also produces a large amount of waste acid, waste water and high-temperature coking waste that is difficult to handle and seriously pollutes the environment;

[0019] Second, in the production process, whether it is due to high temperature or poor reaction selectivity, there are many by-products, which are difficult to separate and purify, which affects the purity and appearance of the final product, and are difficult to use in high-end manufacturing products.

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