A kind of high temperature coal tar pretreatment method

Abstract

The invention provides a pretreatment method of high temperature coal tar, the method is as follows: mixing the high temperature coal tar, naphthenic crude oil and minus three line distillate oil with a demulsifier to enter a pretreatment reactor, stirring, standing for separating to obtain a liquid phase and an insoluble matter, mixing the liquid phase, solvent oil and an alcohol matter to enter a metal removal the reactor to contact with a filler for reaction, contacting fresh water with a reaction effluent which enters a water washing tower to obtain a mixture to enter a dehydrating tower, and separating to obtain the high temperature coal tar with metals being removed and water. The metals in the high temperature coal tar can be removed by the method under mild process conditions, a coal tar raw material can be purified, the metal deactivation of a catalyst in a hydrogenation reactor can be slowed down, and the rise of the pressure drop of a bed layer can be slowed down.

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 shortcomings 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 pretreatment method for 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 hydrotreating method for high-temperature coal tar

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