Process system for producing crude phenol by decomposing net sodium phenolate by using heating furnace flue gas

Abstract

The invention relates to a process system for producing crude phenol by decomposing net sodium phenolate by using heating furnace flue gas. The process system comprises a traffic valve, a flue gas cooling system, a flue gas concentration regulating pressurization system and a phenate decomposition system. By improving the structure of a heating furnace chimney, the heating furnace flue gas containing CO2 is cooled, collected, thickened and pressurized and sent to the phenate decomposition system to react with the net sodium phenolate to form the crude phenol and a sodium carbonate solution, the problem that the crude phenol can further be produced without direct supply of a CO2 concentration gas source required for the decomposition of the phenate, the process flow is simple, the operationis convenient, the investment is saved, the operation cost is low, no pollution is caused, and the national environmental protection requirements are met.

Description

technical field [0001] The invention relates to the technical field of coking, in particular to a process system for producing crude phenol by decomposing net sodium phenoxide with flue gas from a heating furnace. Background technique [0002] Phenols are one of the main products processed and extracted from coal tar. Excessively high phenolic substances have adverse effects on the further processing of coal tar and cause economic losses. It is necessary to carry out alkali washing on the corresponding fractions with high phenol content in tar to convert them into net Sodium phenate, and then decompose to produce crude phenol. [0003] At present, the decomposition techniques of net sodium phenate in coal tar processing include sulfuric acid method, carbon dioxide method and carbon dioxide + sulfuric acid method. Depending on the amount of treatment, the sulfuric acid method is divided into two types of processes: batch and continuous. [0004] According to the notice issu...

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Problems solved by technology

Due to the heavy coke production in China's coking industry and the comprehensive utilization of light chemical products, and due to the lack of concentration in scale, the coal tar processing equipment system has a small supporting capacity, and many independent coal tar processing enterprises have branched out, and their production processes lack CO 2 (content 15-20%) gas source, can not produce crude phenol products, new enterprises thus cause unnecessary economic losses, while the process of decomposing net sodium phenate into crude phenol by sulfuric acid method in old factories is facing elimination and prohibits the use of this process At the same time, a large amount of sodium sulfate wastewater is produced. So far, there is no good treatment method. These have seriously affected the normal production and development of the enterprise and need to be solved urgently.

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