A kind of processing method of high temperature coal tar

Abstract

The invention provides a method used for processing high temperature coal tar. The method comprises following steps: high temperature coal tar is subjected to fractionation so as to obtain a light fraction and a heavy fraction; the heavy fraction, vacuum 3st side cut of naphthenic crude, and a demulsifier are mixed, and are introduced into a pretreatment reactor, and an obtained mixture is stirred, is allowed to stand, and is separated so as to obtain a liquid phase and an insoluble substance; the liquid phase, solvent naphtha, and an alcoholic compound are mixed, and are introduced into a demetalization reactor; contact reaction with a filling material is carried out, an obtained reaction effluent is delivered into a water washing column, and is contacted with fresh water so as to obtain a mixed substance; the mixed substance is introduced into a dehydrating tower for separation so as to obtain metal-free high temperature coal tar and water. The method can be used for removing metal in high temperature coal tar under mild conditions, purifying coal tar raw material, 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 coal tar deep processing, and in particular relates to a processing method for high-temperature coal tar. Background technique [0002] Coal tar is a liquid product obtained during carbonization and gasification of coal. Depending on the carbonization temperature and method, the following tars can be obtained: low-temperature (450°C-650°C) carbonization tar; low-temperature and medium-temperature (600°C-800°C) generator tar; medium-temperature (900°C-1000°C) vertical furnace Tar; high temperature (1000°C) coking tar. No matter what kind of tar is a black or dark brown viscous liquid with a pungent odor. The density at 20 ° C is between 0.98 and 1.2 g / cm3, and its value decreases with the increase of temperature. Coal tar is an organic mixture dominated by aromatic hydrocarbons, containing more than 10,000 compounds, about 500 of which can be extracted. At present, there are about 50 species that are valuable, e...

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Problems solved by technology

[0007] Aiming at the disadvantages of high asphaltene and 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 process for processing high-temperature coal tar Combining the existing forms of metals in coal tar found in experimental research and the actual test results, the metals in high-temperature coal tar are removed under mild process conditions, the raw materials of coal tar are purified, and the metal deactivation of the catalyst in the hydrogenation reactor is slowed down. Layer pressure drop rises, offering a viable treatment for high-temperature coal tar

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