Synthetic method of o-phenylphenol

Abstract

The invention discloses a synthetic method of o-phenylphenol. The method comprises the following steps: Pt / C catalyst modified by alkali metal carbonate or alkali earth metal carbonate and cyclohexanone dimer are added in a reaction vessel, nitrogen is charged for 2-3 times to replace the air in the reaction vessel, and then heating is conducted under stirring to temperature of 320 to 400 DEG C ;the reaction pressure is 0.6 to 2MPa, the reaction is stopped when the content of intermediate o-cyclohexyl alkylphenol in the reaction liquid is less than 2 percent, and the reaction liquid is cooledto the temperature of 60 to 70 DEG C and filtered to obtain the filtrate containing o-phenylphenol. The core of the method is that the active carbon carrier is modified by alkali metal carbonate or alkali earth metal carbonate so as to inhibit the promotion action of the acid center on the active carbon to the decomposition of the reaction material, namely, cyclohexanone dimer, and simultaneouslyprovide proper alkaline condition for the generation of the o-phenylphenol, therefore, the selectivity of the catalyst is greatly improved. Moreover, the production efficiency of the catalyst in process unit is high, the recovery of the catalyst is convenient, and the method is beneficial to industrialization.

Description

technical field [0001] The invention relates to a method for synthesizing compounds, in particular to a method for synthesizing o-phenylphenol. Background technique [0002] Ortho-phenylphenol (OPP) is an organic chemical product with a wide range of uses. It is widely used in sterilization and anticorrosion, printing and dyeing auxiliaries and surfactants, synthetic new plastics, stabilizers and flame retardants for resins and polymer materials, etc. field. [0003] OPP and its sodium salt have a broad-spectrum bactericidal and mildew-removing ability, and are low-toxic and tasteless. They are good preservatives and can be used for anti-mold and preservation of fruits and vegetables, especially for citrus anti-mold, and can also be used to treat lemons. , pineapples, pears, peaches, tomatoes, cucumbers, etc., can minimize rot. Britain, the United States, Canada and other countries allow a wider range of fruits to use OPP. OPP and its sodium salt can also be used as a pre...

AI Technical Summary

Problems solved by technology

Due to the addition of hydrogen acceptors and solvents to the reactants, the cost is increased, the subsequent separation and purification tasks are increased, and the industrialization value is not great.

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