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Method for catalytically synthesizing paraethyl phenol

A technology for ethyl phenol and phenol, applied in the field of catalytic synthesis of p-ethyl phenol, can solve the problems of affecting catalyst stability, low product quality, low stability, etc., and achieves convenient product separation, high raw material activity, and warm reaction conditions. Effect

Active Publication Date: 2013-04-17
溧阳常大技术转移中心有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

If it needs to be operated under high temperature and high pressure conditions, and the product is complex and the product quality is not high
Current studies have found that most catalyst systems have problems such as poor selectivity and low stability.
Due to the use of acidic catalysts, low-carbon alcohols are prone to dehydration on the catalyst to cause polymerization, resulting in carbon deposition, which affects the stability of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using modified ZSM-5 as a catalyst, wherein the concentration of cetylpyridine bromide solution used in the modification process is 200mmol / L, the loading capacity of phosphoric acid is 2.5%, with diethyl carbonate and phenol as raw materials, at the reaction temperature The temperature is 320°C, the molar ratio of raw materials diethyl carbonate and phenol is 1:1, and the mass space velocity is 10h -1 under the conditions. The conversion rate of phenol reaches 46.7%, and the selectivity to p-ethylphenol is 65.8%.

Embodiment 2

[0025] Using modified ZSM-5 as a catalyst, wherein the concentration of cetylpyridinium bromide solution used in the modification process is 100mmol / L, the phosphoric acid loading is 2.5%, with diethyl carbonate and phenol as raw materials, at the reaction temperature The temperature is 320°C, the molar ratio of raw materials diethyl carbonate and phenol is 1:1, and the mass space velocity is 10h -1 under the conditions. The conversion rate of phenol reaches 47.2%, and the selectivity to p-ethylphenol is 59.3%.

Embodiment 3

[0027] Using modified ZSM-5 as a catalyst, wherein the concentration of cetylpyridine bromide solution used in the modification process is 400mmol / L, the phosphoric acid loading is 2.5%, with diethyl carbonate and phenol as raw materials, at the reaction temperature The temperature is 320°C, the molar ratio of raw materials diethyl carbonate and phenol is 1:1, and the mass space velocity is 10h -1 under the conditions. The conversion rate of phenol reaches 45.1%, and the selectivity to p-ethylphenol is 66.1%.

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Abstract

The invention relates to a method for catalytically synthesizing paraethyl phenol, which is characterized by taking diethyl carbonate and phenol as the raw materials and taking the modified microporous molecular sieve MCM-22, ZSM-5 or HY as a catalyst to carry out catalytic reaction under the following conditions: the reaction temperature is 200-350 DEG C, the mole ratio of diethyl carbonate to phenol is 1:2-2:1 and the mass space velocity is 1-12h<-1>. By the method, good raw material conversion rate and target product selectivity can be obtained. Under the best conditions, the conversion rate of phenol can reach 100% and the selectivity of paraethyl phenol can reach 82.2%. The method in which the modified microporous molecular sieve MCM-22, ZSM-5 or HY is taken as the catalyst and diethyl carbonate is taken as the alkylating agent to react with phenol to catalytically synthesize paraethyl phenol has the advantages of high raw material activity, mild reaction conditions, simple process, convenient product separation, good selectivity of the target product paraethyl phenol, etc.

Description

technical field [0001] The invention relates to a method for catalytically synthesizing p-ethylphenol, in particular to a method for catalytically synthesizing p-ethylphenol with modified microporous molecular sieves. Background technique [0002] p-Ethylphenol is widely used as an important raw material for the production of phenolic resins, rubber anti-aging agents, surfactants, etc., and is also an important intermediate for the production of spices and pesticides. The synthetic method of p-ethylphenol mainly contains following several kinds: [0003] (1) Natural separation method [0004] The natural separation method is the traditional preparation method of p-ethylphenol, but due to limited resources and complicated separation process in recent years, the devices for natural separation and preparation of p-ethylphenol have been continuously shut down and replaced by chemical synthesis. [0005] (2) Ethylaniline diazotization hydrolysis method [0006] The method is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C39/06C07C37/16B01J29/70B01J29/40
CPCY02P20/52
Inventor 李永昕薛冰徐崇福吕烈超贾泉
Owner 溧阳常大技术转移中心有限公司
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