A kind of high temperature coal tar processing method

Abstract

The invention provides a method used for processing high temperature coal tar. The method comprises following steps: high temperature coal tar is mixed with solvent naphtha, an obtained mixture is delivered into a demetalization reactor, the mixture is reacted with a filling material, an obtained effluent is delivered into a water washing tower to contact with fresh water, an obtained mixed material is delivered into a dehydrating tower, metal-free high temperature coal tar and water are obtained via separation, the metal-free high temperature coal tar is delivered into a boiling-bed reactor for hydrogenation reaction, an obtained reaction effluent is subjected to flash evaporation dehydration fractionation so as to obtain a light fraction and a heavy fraction, the light fraction is delivered into a fixed bed reactor for hydrogenation reaction, an obtained reaction product is subjected to separation so as to obtain gas, naphtha, and diesel oil, all of the heavy fraction is recycled back to the boiling-bed reactor for circular process, or a part of the heavy fraction is recycled back to the boiling-bed reactor, and the rest heavy fraction is discharged. The method is capable of removing metal in high temperature coal tar at mild conditions, and delaying metal inactivation of catalysts in hydrogenation reactors and increasing of bed pressure drop.

Description

technical field [0001] The invention belongs to the field of deep processing of coal tar, and in particular relates to a low-temperature, low-cost, rapid metal removal and hydrogenation processing method for high-temperature coal tar. Background technique [0002] Coal tar is a black or dark brown viscous liquid with pungent odor generated during carbonization of coal, referred to as tar. According to the different final heating temperatures, coal tar can be divided into three types: medium, low and high. Among them, low-temperature coal tar is 500°C -600°C, medium temperature coal tar 700°C-900°C, high temperature coal tar 900°C-1100°C, the processing temperature is different, corresponding to the composition and properties of coal tar are very different, especially the properties of high temperature coal tar are the most inferior, medium and low temperature Coal tar and high-temperature coal tar are two completely different tars. They have different ingredients, different ...

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Problems solved by technology

[0006] Aiming at the disadvantages of high metal content in high-temperature coal tar, large amount of metal deposition and fast deactivation speed in the hydrogenation reactor during hydrogenation reaction, the present invention provides a treatment method for high-temperature coal tar, which is found in combination with experimental research Existing forms of metals in coal tar and actual test results, remove metals in high-temperature coal tar under mild process conditions, purify coal tar raw materials, slow down metal deactivation of catalysts in hydrogenation reactors and rise in bed pressure drop , to provide a feasible hydrotreating method for high temperature coal tar

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