High temperature coal tar demetalization method

Abstract

The invention provides a high temperature coal tar demetalization method. The method comprises the following steps: high temperature coal tar and solvent oil are mixed and are preheated to 150-250 DEG C, and the obtained heated mixture enters a demetalization reactor, and has full contact with and reacts with a filler in the demetalization reactor; and obtained reaction effluent enters a water washing tower, and is in full contact with fresh water to make metal inorganic substances dissociated from the reaction effluent in the water, and obtained mixture enters a dehydration tower and undergoes oil and water separation in order to obtain demetalized high temperature coal tar and water. The method removes metals from the high temperature coal tar under mild technologic conditions, purifies the coal tar raw material, and alleviates the metal inactivation of a catalyst in a hydrogenation reactor and the rising of the pressure drop of a bed.

Description

technical field [0001] The invention belongs to the field of coal tar deep processing, and in particular relates to a low-temperature, low-cost, and rapid metal-removing 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 water content, a...

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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 pretreatment method for high-temperature coal tar, combined with experimental Existence forms of metals in coal tar found in research 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 bed pressure drop provides a feasible hydroprocessing method for high-temperature coal tar

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