Delayed coking-hydrorefining process for shale oil

Abstract

The invention relates to a delayed coking-hydrorefining process for shale oil. The process comprises the following steps: (1) allowing a full shale oil fraction and a reaction product of delayed coking obtained in step (3) to enter into a distillation apparatus together and carrying out fractionation to obtain a light fraction and a heavy fraction, wherein fractionation temperature of the light fraction and the heavy fraction is 330 to 370 DEG C; (2) subjecting the mixed light fraction obtained in step (1) to hydrotreatment, wherein the light fraction obtained in step (1) comprises a light fraction in shale oil and a light fraction in the reaction product of delayed coking; and (3) subjecting the mixed heavy fraction obtained in step (1) to delayed coking and allowing the reaction product of delayed coking to enter into the distillation apparatus in step (1), wherein the mixed heavy fraction obtained in step (1) comprises a heavy fraction in the full shale oil fraction and a heavy fraction in the reaction product of delayed coking. Compared with the prior art, the invention has the following advantages: with the process, shale oil can be processed into high-quality naphtha and diesel oil, yield of light oil is increased, petroleum coke with a high added value can be obtained, and the process is favorable for stable running of a production apparatus.

Description

technical field [0001] The invention relates to a shale oil processing method, in particular to a method for processing shale oil by using a delayed coking-hydrofining combined process. Background technique [0002] Shale oil is a liquid product obtained by heating and decomposing kerogen in oil shale. In addition to many non-hydrocarbon compounds such as sulfur, nitrogen and oxygen, shale oil also contains a large amount of unsaturated hydrocarbons. Unsaturated hydrocarbons and non-hydrocarbon compounds in shale oil are the main reasons for the increase of oil colloid and the formation of sediment, which leads to poor stability and black color. Due to the nature of shale oil is different from natural petroleum, it is mainly used as fuel oil and the production of chemical products. To produce motor fuel oil from shale oil, it is necessary to remove non-hydrocarbon compounds and saturated olefins to ensure product quality. [0003] CN200610136416 discloses a method for proc...

AI Technical Summary

Problems solved by technology

The disadvantage of this processing method is that the hydrogenation reaction conditions of the whole fraction of shale oil are harsh, the hydrogen consumption is high, the product quality is not high, and the investment is large.

The disadvantages of this method are: complex process flow and high investment; at the same time, due to the use of hydrochloric acid to produce acid slag, which pollutes the environment, it is necessary to use acid-resistant materials

Its disadvantages are: the use of two-stage all-hydrogen technology, high hydrogen consumption, high operating costs, high construction investment; and the fluidized bed technology is not mature enough

The disadvantages of this process are: the pyrolysis product has more oxygen-containing compounds, the liquid product is not further processed, and the quality is poor

[0009] After research, it is found that the whole fraction of shale oil contains more unstable components. When distillation is carried out without pretreatment, certain chemical reactions will occur in the distillation device due to the long residence time at high temperature. The product has an adverse effect on the subsequent hydrogenation unit