Joint processing technique for coal and stone oil

Abstract

The invention relates to a method for processing coal and petroleum together and comprises the following steps: (1) coal power and solvent oil are prepared into coal slurry; (2) the coal slurry is done with hydrogenation reaction and lytic reaction; (3) petroleum products are done with the hydrogenation reaction after the products in the step (2) are done with solid-removing; (4) fraction with the temperature of 350-520 DEG C in the fraction of the step (3) products is taken as the solvent oil circularly; wherein, the solvent oil of the step (1) further comprises residual oil from the petroleum and the naphthenic base residual oil is the best. By adopting the method of the invention, the residual oil can be transformed fully, the density of the coal slurry keeps high and the fuel production rate of high quality engines can be improved.

Description

technical field [0001] The present invention relates to a process for co-processing coal and petroleum, that is to use coal and petroleum as raw materials to produce high-quality engine liquid fuel products and chemical raw materials. Petroleum processing processes combine to produce more, high-quality motor fuel products and chemical products. Background technique [0002] Petroleum processing and direct coal liquefaction are two processes that use petroleum and coal as raw materials to produce fuel oil and chemical raw materials respectively. Among them, petroleum processing is a traditional industrial process. After nearly a century of development, the processing process and various The operating unit technologies are relatively mature. Since the direct coal liquefaction technology was first proposed at the beginning of the last century, many countries and enterprises have invested a lot of energy in research, especially after the 1970s, the worldwide oil crisis accelera...

AI Technical Summary

Problems solved by technology

[0006] First, the properties of solvent oil directly affect the properties of coal slurry. In the direct liquefaction process of coal alone, the circulating solvent oil used to prepare coal slurry is required to have an appropriate viscosity, generally less than 40mm 2 / s (80°C), and the viscosity of residual oil is much higher than that of coal liquefaction circulating solvent oil (refer to the typical residual oil listed in Table 1). When preparing coal slurry, on the one hand, the proportion of coal powder in the coal slurry will be greatly reduced. Usually, the content of coal powder in the coal slurry can only be controlled below 40m%, or even below 35%. Using this low-concentration coal slurry raw material It is equivalent to reducing the processing capacity of the direct coal liquefaction device and reducing the utilization rate of the equipment, which is not conducive to fully reflecting the value of the equipment in the direct coal liquefaction system; on the other hand, it will greatly increase the viscosity of the coal slurry. This high-viscosity coal slurry Not conducive to conveying in the system, especially increases the tendency of coking in heating equipment

[0007] Second, the current vehicle diesel product standards require the cetane index to reach 45 or more, or even 49 or more. In the above-mentioned joint processing of coal and petroleum, due to the composition of the raw materials, the resulting diesel products contain a large amount of aromatics And cycloalkane, its cetane number is low, generally below 35, it is difficult to produce light diesel oil products that meet the current automotive diesel standards, if it is reprocessed with hydro-upgrading, hydrocracking and other technologies, Will lose 5-10% of diesel yield while increasing hydrogen consumption and processing costs

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