Device and process for continuous separation of coal tar components

Abstract

The invention discloses a device and a process for continuous separation of coal tar components. A solvent A and coal tar are subjected to mixing, extracting and stirring in an extraction reactor, and a mixture of the coal tar and the solvent A is separated in a separation tank to obtain an asphalt component; by arrangement of two adsorption towers, continuous performing of adsorption and elution is realized, a solvent A extract without the asphalt component is allowed to pass through the adsorption towers, and mixed liquid obtained after adsorption separation enters a neutral oil component separation tower to realize rectification to obtain a neutral oil component and the recovered solvent A; a solvent B is pressurized through a solvent B feeding pump and eluted through the adsorption tower which adsorbs the solvent A extract, eluant enters a crude phenol component separation tower to obtain a crude phenol component and the recovered solvent B through rectification separation. The process which is a green separation process is free of waste water, waste residues and waste gases and has advantages of mild operation conditions, simplicity and convenience in operation, low process and equipment cost, low input and the like.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry and relates to a continuous separation process and device for coal tar components. Background technique [0002] Coal tar is a very valuable organic chemical raw material. Some products cannot or cannot be economically obtained from petrochemical raw materials. For example, anthracene, acenaphthene and pyrene produced in the coking industry can meet more than 90% of the world's total demand. The azoles and quinolines are almost 100% from coking products. Therefore, coal tar products occupy an extremely important position in the world's chemical raw materials. According to the chemical composition, coal tar can be divided into neutral compounds, acidic compounds, oxygen-containing compounds (very low content) and sulfur-containing compounds (very low content). Neutral compounds, commonly known as neutral oils, mainly include aliphatic hydrocarbons and aromatic hydrocarbons. Alipha...

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Problems solved by technology

[0009] In summary, there are many problems in the current traditional coal tar processing, such as high energy consumption, many and complicated operating procedures, low separation and utilization efficiency of product components, large amount of phenolic wastewater, and serious environmental pollution. The new technology of tar separation either has important defects, or there are large-scale equipment development problems in industrial applications, it is difficult to produce in large-scale chemical industry and the investment cost is high, so it can only stay in the laboratory stage

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