Device and process for preparing phenolic resin from coal tar

Abstract

The invention discloses a device and a process for preparing phenolic resin from coal tar. The process includes: taking methyl benzene or benzene as a solvent, taking acid or alkaline as a catalyst, subjecting the coal tar or distillation fractions thereof to phenolic polymerization reaction with formaldehyde, benzaldehyde, paraformaldehyde and furfural under certain conditions, filtering reaction products through a closed rotary drum vacuum filter to obtain the phenolic resin as well as solvent-containing dephenolized coal tar, rectifying the solvent-containing dephenolized coal tar to realize separation of water and the solvent, and recover the solvent to realize solvent recycling. Cheap medium-and low-temperature coal tar high in phenol content is adopted for phenolic polymerization reaction with aldehydes to prepare the phenolic resin, and phenolic substances in the medium-and low-temperature coal tar can be completely removed by further reaction. Therefore, phenol removal steps are simple, solvent recycling is realized, economy and environment friendliness are achieved, and a novel coal tar processing method simple in process, low in production operation cost, remarkable in economic benefit and easy for industrialization is provided.

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...

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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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