A process and device for preparing phenolic resin from coal tar

Abstract

A process and device for preparing phenolic resin based on coal tar, using toluene or benzene as a solvent, acid or alkali as a catalyst, coal tar or its distillation fractions and formaldehyde, benzaldehyde, paraformaldehyde and furfural under certain conditions to undergo phenolic polymerization Reaction, the reaction product is filtered through a closed drum vacuum filter to obtain phenolic resin, and at the same time, dephenolized coal tar containing solvent is obtained, and the dephenolized oil containing solvent is subjected to rectification to realize the separation of water and solvent, and the solvent is recovered. The solvent can be reused. This process uses cheap medium-low temperature coal tar with high phenol content to undergo phenolic polymerization reaction with aldehydes to prepare phenolic resin. The phenolic substances in medium-low temperature coal tar can be basically completely removed through one-step reaction, and the phenol removal step is simple. At the same time, the solvent is recycled, which is economical and environmentally friendly. It is a new coal tar processing method with simple process, low production and operation costs, significant economic benefits and easy industrialization.

Description

technical field [0001] The invention relates to the technical field of coal tar processing, in particular to a process and a device for preparing phenolic resin from coal tar. Background technique [0002] With the gradual reduction of world petroleum resources, coal tar, as a valuable chemical raw material, is becoming increasingly prominent. For medium and low temperature coal tar with more phenol content, it is mainly produced by the low temperature pyrolysis process of coal, which is mainly composed of neutral compounds (aliphatic hydrocarbons and aromatic hydrocarbons), acidic compounds (mainly 30% to 40% phenolic content) , oxygen-containing and sulfur-containing compounds (very small amount). Phenolic compounds (especially phenol and cresol) are widely used in industry, agriculture, national defense, medicine and health, etc. For coal tar with a very complex composition, the current traditional methods for the separation and transformation of phenolic compounds in c...

AI Technical Summary

Problems solved by technology

[0005] In the method of patent CN1693331A, although coal tar is utilized in the preparation of phenolic resin, only a small amount of coal tar is used as a raw material for the production of modified phenolic resin in the preparation process, and coal tar is not mostly utilized. low utilization

[0006] The method of patent CN103289718A, though utilizes coal tar and aldehydes to produce phenolic resin, because in its reaction process, the coal tar under the heated state still has certain viscosity, adds that viscosity increases more after being polymerized with aldehydes Fast, the reaction will be stopped prematurely due to the high viscosity and the inability to stir, resulting in insufficient contact of the reaction substance with a low conversion rate of the reaction and uneven phenolic resin produced by the reaction, which increases the difficulty of separating the phenolic resin in the later stage, and it does not No specific method for separating phenolic resins is proposed

[0007] To sum up, there are few reports on the preparation of phenolic resins by the reaction of cheap phenolic substances in coal tar and aldehydes, and they are all in the laboratory research stage, and there are more or less problems

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