Coal and stone oil joint processing method for producing high quality engine fuel

Abstract

The invention relates to a method which can combine coal and petroleum to produce good quality fuel of a motor, which comprises the following steps: (1) the coal powder and the solvent oil are prepared into coal slurry; (2) the coal slurry is subject to hydrocracking reaction; (3) the oil products of the step (2) are subject to hydrogenation reaction after experiencing solid removal; (4) the liquefied whole fraction produced by the step (3) is subject to fractionation to get three fractions, that is, naphtha fraction, diesel fraction and fraction oil higher than 350 DEG C; (5) the diesel fraction of the step (4) is subject to depth hydrofining; (6) the high cetane value diesel produced in the process of petroleum and the products produced by the step (5) are mixed according to the needed ratio, thus obtaining motor fuel with good quality; wherein, the solvent oil of the step (1) comprises the petroleum fraction oil. The method can fully transfer heavy oil, maintain high coal slurry concentration and improve the yield of motor fuel with good quality. .

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

[0009] Second, in the process of direct coal liquefaction, the viscosity of circulating solvent oil used to prepare coal slurry is generally less than 40mm 2 / s (80°C), and the viscosity of heavy oil is much greater than that of coal liquefaction circulating solvent oil (see the typical heavy oil listed in Table 1). Reduce the proportion of coal powder in coal slurry. Generally, the content of coal powder in coal slurry can only be controlled below 40m%, or even below 35%. Using this low-concentration coal slurry raw material is equivalent to reducing the cost of direct coal liquefaction equipment. Utilization rate is not conducive to fully reflecting the value of coal direct liquefaction system equipment

At the same time, this high-viscosity coal slurry is not conducive to transportation in the system, especially increasing the tendency of coking in the heating equipment

[0010] Third, due to the composition of the raw materials in the coal and petroleum co-processing technology mentioned above, the diesel product produced by it contains a large amount of aromatic hydrocarbons and cycloalkanes, and its cetane number is low, generally below 35, while the product standard requires Above 45, even above 49, so it is difficult to produce light diesel products that meet the current automotive diesel standards. If hydrogenation reforming, hydrocracking and other technologies are used to process it, 5-10% of diesel will be lost yield while increasing hydrogen consumption and processing costs

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