Preparation method for styrenated phenol

Abstract

The invention discloses a preparation method for styrenated phenol. The preparation method comprises the following steps: adding phenol and p-toluenesulfonic acid into a container, introducing nitrogen, carrying out sufficient stirring with a stirring device at a rotating speed of 300 to 350 r / min, carrying out heating to 85 DEG C and then starting addition of styrene drop by drop, wherein the addition lasts for less than 2.5 h; after completion of the addition of styrene, carrying out heating to 120 to 130 DEG C at a constant rate and maintaining the temperature for 2 to 2.5 h; and stopping heating, adding triethylamine into a mixture obtained in the previous step, carrying out full stirring, then successively carrying out filtering, pumping filtration and vacuum distillation until no liquid is distilled off, carrying out cooling to 80 DEG C or below, and then carrying out discharging. According to the invention, the catalyst p-toluenesulfonic acid used in the invention is an organic acid and exerts good promotion effect on the alkylation reaction of phenol with styrene; the acidity of p-toluenesulfonic acid is weaker compared with inorganic strong acids like sulfuric acid and hydrochloric acid, so corrosion to reaction equipment is small; and reaction process is smooth and steady, reaction temperature is easy to control, and prepared styrenated phenol has a shallow color.

Description

technical field [0001] The present disclosure generally relates to the field of antioxidants, specifically to the field of antioxidant production, and in particular to a preparation method of styrenated phenol. Background technique [0002] At present, the traditional styrenated phenol production process in China has problems such as low product yield, low content of secondary substitutes, high cost, and serious equipment corrosion. The catalyst used in the earliest production process is mainly sulfuric acid, which has the advantages of low reaction temperature and fast reaction speed. The disadvantage is that sulfuric acid oxidizes the product and is highly corrosive to equipment. The production process requires post-treatments such as neutralization, filtration, and water washing. The process is cumbersome, the yield is low, and there are three wastes. Later, some enterprises used liquid acid catalysts: hydrochloric acid, oxalic acid, phosphoric acid, polyphosphoric acid,...

AI Technical Summary

Problems solved by technology

In recent years, it has been suggested that minerals, activated clay, ion exchange resins, and zeolites should be used instead of inorganic acid catalysts to synthesize styrenated phenols. The research on the catalytic effects of ion exchange resins and zeolite catalysts is still in the laboratory development stage, and there is still a heat-resistant Poor, short life, uneven pore distribution, low conversion rate, etc.

Minerals and activated clay have the disadvantages of solid waste pollution and high cost