Resorcin synthetic process

Abstract

The invention relates to a synthesis process of resorcinol, which takes cyclohexane with -OH substituent group or =O substituent group at the location 1 and the location 3 as raw material, and takes water as a solvent. The resorcinol is obtained by catalytic dehydrogenation at the temperature of 150 to 300 DEG C and the pressure of 0.1-1.7MPa for 3-10h; wherein, the water is taken as a reaction medium, and the dehydrogenation catalyst is chosen from Pd, Pt or Ni series. The process has simple synthetic route and simple process; the reaction is easily controlled; the water is taken as the solvent, so less three wastes are generated, and the synthesis process of the resorcinol is environmentally friendly and has less cost; meanwhile, as the catalyst is chosen from the Pd, the Pt or the Ni catalysts, the catalyst has the advantages of good catalytic selectivity, high activity and high reaction conversion rate, and the resorcinol obtained is easily purified with high yield.

Description

【Technical field】 [0001] The invention relates to an organic synthesis process, in particular to a synthesis process of resorcinol. 【Background technique】 [0002] Resorcinol is an important basic fine organic chemical raw material, which is widely used in many fields such as medicine, pesticide, dye, rubber, adhesive, electronic chemical and so on. The present industrialized resorcinol synthesis method mainly contains two: the one, the sulfonation alkali fusion method (sulfonation method) of benzene, and the 2nd is the oxidation method (oxidation method) that is raw material with m-dicumene. The sulfonation method uses benzene and sulfuric acid as raw materials, and the process includes sulfonation, neutralization, alkali fusion and acidification. This method has a simple process and low equipment requirements, but the production process is lengthy, there are many wastes, and the environmental friendliness is low; The oxidation method is to first oxidize m-dicumyl to dicumy...

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Problems solved by technology

However, the route design of this process is catalytic oxidation dehydration, rather than direct catalytic dehydrogenation, and the yield of resorcinol is only about 80%, the process conditions are relatively high, and the cost is relatively high

British Patent GB1188387 discloses a 1,3-cyclohexanedione at a temperature of 150-300 ° C, using iodine, 5% palladium charcoal or 5% palladium-coated calcium carbonate as a catalyst, through catalytic dehydrogenation to obtain m-benzene The method of diphenol, but the transformation rate of this document embodiment only has 26%; U.S. Patent US4431848 has synthesized above-mentioned (2), (3) synthetic route, is raw material with δ-ketoester, and catalytic cyclization becomes cyclo Diketone or 3-hydroxycyclohexenone, and then catalytic dehydrogenation of cyclic diketone or oxidative dehydration of 3-hydroxycyclohexenone to obtain resorcinol, which provides a method using water as a solvent However, the overall conversion rate of cyclohexane-1,3 diketone is only about 80% (column 60-70, column 11, column 12, line 12, US4431848 specification), which is far lower than other 95-98% conversion under the same reaction conditions in the examples of organic solvents

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