Heavy distillate hydrogenation and catalytic cracking combined method

Abstract

The invention relates to a combination method of hydrogenation disposal and catalytic cracking used for heavy distillate oil. Under the hydrogenation disposal condition, the heavy distillate oil is used as raw material oil, and the raw material oil and hydrogen are mixed and pass by a first hydrogenation disposal reaction area, thus generating oil by hydrogenation disposal; the oil is separated to obtain the gas which is then desulfurized; the gained liquid is mixed with hydrogen desulfurized and pressurized by a circular hydrogen compressor and then passes by a second hydrogenation disposal reaction area, thus generating the oil by the hydrogenation disposal; the oil is separated to gain the gas which enters the first hydrogenation disposal reaction area directly; and the gained liquid is fractionated in a fractionating tower to gain the low-sulfur light oil product and heavy oil product. The heavy oil product can be independently catalytically cracked or mixed with other heavy raw material oils and then catalytically cracked, thus obtaining various light oil products and circular oil; and the circular oil can be circulated and returned to the catalytic cracking process and also can enter the hydrogenation disposal process. Compared with the prior art, the method effectively improves the hydrogenation disposal depth of the raw material oil, needs only one circular hydrogenation system for two hydrogenation disposal reaction areas, has low investment of equipment, low operation expense, and can directly produce clean gasoline and diesel.

Description

technical field [0001] The invention relates to a combined method, in particular to a combined method of hydrogenation treatment and catalytic cracking. Make full use of low-sulfur circulating hydrogen to carry out advanced hydrotreating of inferior heavy distillate oil, and after hydrogenation tail oil undergoes catalytic cracking process, clean gasoline, diesel fraction and high value-added gas that meet the requirements of environmental protection regulations are obtained, and catalytic cracking is returned to refining It can be recycled in the catalytic cracking unit, or all or part of it can enter the hydrotreating reactor. Background technique [0002] At present, the nature of crude oil in the world is gradually becoming heavier and worse, coupled with the continuous development of the world economy and the increasingly stringent environmental protection regulations, it is necessary to produce a large amount of light and clean fuels. Cost to produce products that mee...

AI Technical Summary

Problems solved by technology

The main problem of this process is that the quality of gasoline products obtained by catalytic cracking of atmospheric residual oil is poor, which cannot meet the increasingly stringent environmental protection requirements. At the same time, as the demand for middle distillate oil increases significantly, this process needs to be further improved

In addition, due to the increase in the processing capacity of the refinery and the increase in the amount of heavy crude oil, the output of heavy and residual oil has also increased accordingly, which has greatly affected the development of catalytic cracking, an important means of lightening heavy oil. However, it is necessary to use other methods to improve the product quality of the catalytic cracking unit and reduce its operating severity

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