Method for preparing p-tert octyl phenol

Abstract

The invention provides a method for preparing 4-tert-octylphenol. The C4 fraction addition mixture with 80 percent of isobutene dimer remained by esterification-degasification of sulfuric acid is taken as the raw material ; after the raw material is braized and cut under the temperature between 75 DEG C and 105 DEG C, the isobutene dimmer that the content of the target distillate is more than 98 percent is obtained to be taken as the alkylating agent; Na-type sulfonated styrol-butadiene polymer strong base anion-exchange resin with 50 percent of water is acidified to a H-type sulfonated styrol-butadiene polymer strong acid cation-exchange resin as the alkylation catalyst; the target distillate isobutene dimmer and the phenol are made a alkylation reaction under the temperature between 90 DEG C and 100 DEG C with the H-type sulfonated styrol-butadiene polymer strong acid cation-exchange resin as the catalyst to produce the 4-tert-octylphenol alkylation mixing liquid; the alkylation mixing liquid is braized and cut under the temperature between 220 DEG C and 270 DEG C to produce the 4-tert-octylphenol.

Description

technical field [0001] The present invention relates to the general method of organic chemistry, particularly refers to a kind of 4 The invention discloses a method for preparing p-tert-octylphenol from a fraction addition mixture as a raw material. Background technique [0002] The traditional preparation of p-tert-octylphenol is made by using isobutylene dimer as an alkylating agent to carry out alkylation reaction with phenol under acid catalysis. And adopt clay, sulfuric acid or strongly acidic cation exchange resin as the alkylation catalyst in the alkylation reaction, use clay as the alkylation catalyst to exist the separation and the very difficult difficult problem of processing of the clay after the alkylation reaction; The use of sulfuric acid as an alkylation catalyst has the disadvantage that the water-containing alkylated emulsified mucus formed by neutralization after alkylation is difficult to complete the separation of brine. Although the commercially avail...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defects of the existing p-tertoctylphenol, and to provide a method of using C 4 The distillate addition mixture is used as the raw material to obtain isobutene dimer through sulfuric acid esterification, thermal degassing and fractional steaming and cutting, and then the isobutene dimer is used as the alkylating agent, and the solid acid is used as the catalyst to carry out the alkylation reaction with phenol to prepare the - tert-octylphenol method

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