Preparation technology of p-tert-butyl benzoic acid

Abstract

The invention discloses a preparation technology of p-tert-butyl benzoic acid, comprising the following steps: firstly, adding toluene, isobutene and concentrated sulfuric acid into a reaction kettle, carrying out alkylation reaction to obtain coarse p-tert-butyl toluene, and rectifying to obtain fine p-tert-butyl toluene; secondly, adding a composite catalyst containing the p-tert-butyl toluene,cobalt acetate and bromide into the reaction kettle, heating and introducing oxygen to obtain coarse p-tert-butyl benzoic acid, decoloring by activated carbon and diatomite , crystallizing and dryingto obtain fine p-tert-butyl benzoic acid. The prepared p-tert-butyl benzoic acid is an organic synthesis intermediate, can be used for the fields of additives, antioxidants, alkyd resin modifying agents, soldering fluid, dye, and the like of polypropylene nucleating agents, polyvinyl chloride heat stabilizers, metal machining and lubricating oil and has excellent performance. The p-tert-butyl benzoic acid has low energy consumption, high yield, simple separation, and the like and can satisfy ever-increasing market demands of the p-tert-butyl benzoic acid.

Description

technical field [0001] The invention relates to a preparation process of an organic synthesis intermediate, in particular to a preparation process of p-tert-butylbenzoic acid. Background technique [0002] 4-tert-butylbenzoic acid is an organic synthesis intermediate, mainly used in polypropylene nucleating agent, polyvinyl chloride heat stabilizer, metal processing cutting and lubricating oil additive, antioxidant, alkyd resin modifier, flux and Many special functions such as dyes; it is the main raw material for the production of methyl p-tert-butylbenzoate, which is an organic synthesis intermediate, mainly used in ultraviolet absorbers and new coating additives, so p-tert-butylbenzoate Benzoic acid plays an increasingly important role in the development of the national economy. In recent years, the export demand for p-tert-butylbenzoic acid has soared. European countries such as Germany and France; Latin American countries such as the United States and Brazil, as well a...

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Problems solved by technology

According to the survey, there are few companies producing p-tert-butylbenzoic acid products. At present, there are only six companies in the world producing products. my country's