Combined process for preparing fuel oil by hydro-cracking and hydro-upgrading of coal tar

Abstract

The invention discloses a combined process for preparing fuel oil by hydro-cracking and hydro-upgrading of coal tar, and belongs to the field of coal chemical industries. The coal tar is fractionated through a fractionating tower, then heavy component oil whose boiling point is larger than 360 DEG C and light component oil whose boiling point is lower than 360 DEG C are obtained, the heavy component oil is subjected to a cracking reaction under a hydrogen condition, generated oil formed in the cracking reaction goes back to the fractionating tower, the light component oil whose boiling point is lower than 360 DEG C is subjected to hydro-refining and hydro-cracking systems, so that gasoline and diesel blended components of high quality can be obtained. According to the invention, coke generated is obviously reduced, polymerization and condensation of unsaturated hydrocarbons such as olefin, aromatic hydrocarbons and the like are inhibited, the incidence of coking is reduced, the yield of liquid products obtained through a delayed coking process is improved, working periods of devices are prolonged, and equipment investment is reduced. According to the invention, products of high quality can be produced, and the utilization rate of the coal tar is improved, thereby bringing substantial economic benefits and facilitating environment protection.

Description

technical field [0001] This patent belongs to the field of coal chemical industry, and relates to a new combined process of coal tar hydrocracking and hydrogenation upgrading to produce fuel oil. Background technique [0002] Energy is an important material basis for the sustainable development of the national economy. The current world energy consumption structure is still dominated by petroleum energy consumption. According to the proven reserves and exploitation of crude oil in the world, it is estimated that by the middle of the 21st century, oil consumption will gradually decrease in the energy consumption structure, the proportion of natural gas consumption will increase significantly, and the proportion of coal consumption will basically remain the same. The overall energy situation will gradually transform from oil-based to natural gas-based, and then to coal-based. my country is a country that is short of oil resources, short of natural gas resources, and relative...

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Problems solved by technology

In patent CN1351130A, the coal tar is fractionated first, and the light fraction is hydrogenated and upgraded without further utilization of the heavy fraction. The disadvantage is that the raw material utilization is low

Patent CN1141362C discloses a coal tar hydrogenation method. Coal tar and hydrogen enter a stable hydrogenation reactor filled with a hydrogenation protecting agent and a hydrofining catalyst. The disadvantage of this method is that the coal tar is not treated before hydrogenation. Certain treatment, in the process of hydrogenation due to strong exothermic temperature and local coking

Patent CN1903994A discloses a method for producing fuel oil by hydrogenation and upgrading of coal tar. In this method, coal tar and diluent oil are mixed in proportion for hydrogenation and upgrading. Although the occurrence of coking is slowed down to a certain extent, the activity of coal tar The group still exists, and there is also the possibility of further polymerization and coke

Patent CN101429456A discloses a coal tar delayed coking hydrogenation combined process method, which combines coal tar delayed coking and hydrogenation processes to obtain high-quality liquefied gas, fuel oil and lubricating oil base oil, but the disadvantage is that the liquid Low yield, high coke yield, low utilization rate of coal tar

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