Method for obtaining liquid paraffin, gasoline and diesel oil via extraction of shale oil

Abstract

The invention discloses a method for obtaining liquid paraffin, gasoline and diesel oil via extraction of a shale oil, and belongs to the technical field of petrochemical engineering and energy sources. The method is characterized by comprising the following steps: separating the shale oil in a reduced pressure distillation manner so as to obtain a distillate oil below 420 DEG C and a residual oil, wherein carrying out hydrogenation dewaxing on the residual oil and the distillate oil below 420 DEG C together in a fixed bed reactor filled with a sulfide catalyst after the catalytic distillation cracking of the residual oil; distilling a reaction product so as to obtain the high-quality liquid paraffin and high-quality gasoline and diesel distillate oils. According to the method, the shale oil is treated by using a reduced pressure distillation-hydrogenation dewaxing coupling process, so that the liquid paraffin, the gasoline and the diesel oil which are good in quality are obtained. The specific gravity of the shale oil is decreased and the byproducts with economic values are increased by extracting the liquid paraffin, so that the economic benefit is improved. The method is simple in process, low in energy consumption and high in environmental friendliness, realizes investment saving and is favorable for carrying out deep processing on site so as to increase additional values, thereby providing a new way for the utilization of the shale oil. In addition, the method is good in economic benefit and industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry and energy, and relates to a method for producing liquid paraffin, gasoline and diesel by upgrading shale oil. Background technique [0002] Shale oil refers to the petroleum resources contained in shale formations dominated by shale. It is a brown viscous liquid product with a special pungent smell produced by thermal decomposition of organic matter during oil shale dry distillation. my country has abundant reserves of oil shale resources, including 243.24 billion tons of recoverable oil shale resources; 47.64 billion tons of shale oil resources, 15.97 billion tons of recoverable shale oil resources, and 11.98 billion tons of recoverable shale oil resources. my country's shale oil contains about 40% light diesel oil fraction, which has a high cetane number and can be used as high-speed diesel engine fuel after refining. The shale heavy gas oil fraction contains a large amount of p...

AI Technical Summary

Problems solved by technology

The hydrogenation conditions of this method are high pressure, high energy consumption, and the catalyst is prone to carbon deposition, resulting in deactivation

[0007] Chinese patent, publication number: CN 102286291A, introduces a method for catalytic conversion of shale oil, including catalytic cracking of shale oil to increase the yield of liquefied gas and gasoline, but the method uses a fluidized bed reactor, and the catalyst is easy to wear and tear

In addition, this method does not consider dewaxing shale oil in order to reduce the specific gravity of shale oil and increase economically valuable by-products

[0008] Chinese patent, publication number: CN101492605A, introduces a method of shale oil hydrogenation process, mainly adopts hydrogenation refining, and processes shale oil with high nitrogen content into refined shale oil with low nitrogen content. Shale oil is denitrified and not processed into high value-added chemicals

However, this method directly hydrotreats coal tar, which easily leads to catalytic carbon deposition and deactivation, and the hydrogenation conditions are harsh and energy-consuming.

In addition, the process does not involve the processing of shale oil

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