Clean production method of 2,4-di-tert-butylphenol

Abstract

The invention provides a clean production method of 2,4-di-tert-butylphenol, wherein the clean production method comprises the steps: A) mixing phenol and a catalyst, stirring, heating, adding isobutene, and carrying out a reaction to obtain 2,4-di-tert-butylphenol, wherein the catalyst is a transition metal oxide doped molecular sieve, the transition metal oxide is La2O3 and CeO2, the molecular sieve is an X-type molecular sieve and / or a Y-type molecular sieve, and the mass fraction of the transition metal oxide in the catalyst is 6-20%; and B) mixing the used catalyst with a new catalyst, adding phenol and isobutene, carrying out a reaction again, repeating for several times, extracting and recovering the catalyst by using an organic solvent, and then drying and calcining to finish regeneration and recycling of the catalyst. The molecular sieve catalyst doped with the transition metal is used for alkylation reaction of phenol and isobutene, the catalytic activity is high, byproductsgenerated by reaction of a target product and isobutene molecules can be reduced, and the reaction selectivity is improved.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to a clean production method of 2,4-di-tert-butylphenol. Background technique [0002] 2.4-Di-tert-butylphenol is an antioxidant for aviation gasoline, a low-efficiency stabilizer for natural rubber and synthetic rubber, a heat stabilizer for polyolefins and high-efficiency polystyrene, and can be used to prepare new phenolic resins, coatings, adhesives and pesticides . In the field of polymer additives, 2.4-di-tert-butylphenol is a raw material for synthesizing antioxidant 168, antioxidant 626, ultraviolet absorbers UV-326 and UV-327, etc. [0003] The production of 2,4-di-tert-butylphenol generally adopts isobutylene or methyl tert-butyl ether as an alkylating agent, and uses heteropolyacids, activated clay, strongly acidic cation exchange resins, etc. as catalysts (CN02125506, CN1935763A). At present, most manufacturers in industrial production use activat...

AI Technical Summary

Problems solved by technology

At present, most manufacturers in industrial production use activated clay as a catalyst for 2,4 alkylation reaction. Although activated clay has high activity, low price and low production cost, it cannot be reused and produces more industrial waste residue, and activated clay is harmful to The selectivity of the 2,4 alkylation reaction is poor, and more by-products such as ortho-phenol, p-phenol, and 2,4,6-phenol will be produced during the reaction process, and the yield is low

Catalysts that may be recycled, such as heteropolyacids and strongly acidic cation exchange resins, have not yet been used in industrial production due to their low catalytic activity.