Method for producing fuel oil by hydrogenation of fraction oil of high-temperature coal tar

Abstract

The invention relates to a method for producing fuel oil by hydrogenation of fraction oil of high-temperature coal tar. The method comprises the following steps: a, carrying out medium fractional distillation on high-temperature coal tar (1) at a temperature of 350-400 DEG C to obtain light fraction (3) and heavy fraction (4); b, mixing the light fraction (3) and hydrogen (5) to obtain a mixture and feeding the mixture into a hydrogenation refining reaction zone (6); c, feeding effluent generated by reacting in hydrogenation refining reaction zone (6) into a separation zone (8) for carrying out gas-liquid separation, feeding a liquid-phase product (10) obtained by separating in the separation zone (8) into a desulfurization zone (11) for carrying out hydrogen sulfide removal reaction; and d, feeding liquid-phase oil (13) produced in the desulfurization zone (11) into a fractionation tower (14) for carrying out different-boiling-point fractional distillation to obtain different products, namely, different types of finished product oils, from the fractionation tower (14). The method has the advantages that the reaction heat release of the hydrogenation reaction can be alleviated, the operating periods of the hydrogenation refining reactor and a hydrocracking reaction zone, are prolonged, the content of aromatic hydrocarbon in the hydrogenation refining feedstock controlled by an inert oil circulation process is added, and thus an ideal fractional distillation effect is achieved.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for hydrogenating high-temperature coal tar distillate oil to produce fuel oil. Background technique [0002] Coal tar is one of the important by-products of coal coking and occupies a certain share in the production of coal coke. Based on the current coal coking technology, coal tar production accounts for about 3.5% to 4.2%. However, due to the constraints of backward technology in the downstream chemical industry, the huge amount of coking by-products of coal tar is difficult to use with high added value. At present, the consumption market of high-temperature coal tar in my country is mainly divided into three parts, one is to use crude coal tar as a fuel to replace heavy oil, to use it in thermal energy industries such as glass and ceramics, and as a raw material for producing carbon black; the other is to export it; the third is to use it as a fuel to replace ...

AI Technical Summary

Problems solved by technology

However, in the process of processing high-temperature coal tar, due to the high content of high-temperature coal tar pitch, it is easy to cause coking of the catalyst in the hydrotreating reactor; Too violent, making it difficult to control the temperature of the hydrotreating reactor and difficult to operate

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