A kind of multi-layer fluidized bed for the alkylation reaction of phenolic compound and its application

Abstract

A multi-layer fluidized bed for the alkylation reaction of phenolic compounds is composed of more than two layers of composite baffles placed in a fluidized bed cylinder, the composite baffles are placed horizontally, and their peripheral edges are in contact with the fluidized bed. On the inner wall of the fluidized bed cylinder, above each composite baffle is a relatively independent compartment, and each compartment is filled with catalyst particles independently to form a first-stage fluidized bed; the composition of the composite baffle is as follows: The bottom layer is a horizontal row pipe composed of several short pipes welded. The interior of the short pipes is connected. One end of these short pipes is connected with the water inlet standpipe, and the other end is connected with the inside of the water outlet standpipe and welded firmly; the upper part of the horizontal row pipe is A layer of coarse screen, the outer diameter of the coarse screen is the same as the inner diameter of the fluidized bed cylinder; above the coarse screen is a layer of fine screen, the outer diameter of the fine screen is the same as the inner diameter of the fluidized bed cylinder; the fine screen The pore size of the fluidized bed is smaller than the particle size of the catalyst particles carried on it; the bottom of the fluidized bed is provided with a raw material inlet pipe, and the top is provided with a reaction product outlet pipe.

Description

technical field [0001] The invention relates to a multilayer fluidized bed for alkylation reaction of phenolic compounds and an application method thereof, which is especially suitable for continuous production of alkylphenolic compounds. Background technique [0002] Phenolic compounds (including phenol, m-cresol, p-cresol, o-cresol and other phenolic compounds, etc.) undergo an alkylation reaction to generate alkylphenol compounds. [0003] For phenolic compounds with benzene rings, the non-occupied carbon atoms may be connected with an alkyl group to generate alkylated products with different numbers of alkyl groups, so the alkylation of phenolic compounds is a very complicated reaction. For example, through an alkylation reaction, a tert-butyl group is attached to the 2- or 6-position on the benzene ring of p-cresol to generate 2-tert-butyl p-cresol; the 2-position and 6-position on the benzene ring of p-cresol Each position is connected with a tert-butyl group at the s...

AI Technical Summary

Problems solved by technology

The high content of 2,6-di-tert-butyl-p-cresol brings great waste of production capacity and difficulty in separation

However, for the alkylation reaction of phenolic compounds, the ordinary fluidized bed still has serious shortcomings: if the bed layer is shallow, the alkylating agent is easy to penetrate and escape, especially when isobutylene is used as the alkylating agent, isobutylene is easy to penetrate. Permeates the bed of solid catalyst particles and exits the fluidized bed with the reaction mixture

Therefore, there are no examples of fluidized bed reactors used in the industrial production of alkylphenols in China so far.

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