Combination method for hydrocracking of coal tar whole-fraction suspended bed and hydro-upgrading of fixed bed

Abstract

The invention provides a combination method for hydrocracking of a coal tar whole-fraction suspended bed and hydro-upgrading of a fixed bed. In the method disclosed by the invention, a slurry-bed hydrocracking reactor is a circulating reactor, an adopted catalyst is a high-activity oil-soluble dispersible compound, and the adopted catalysts are a supported hydrorefining catalyst and a hydrocracking catalyst. In the process, the adopted reaction pressure is 12-20 MPa, the volume ratio of hydrogen to oil is 500-1200 Nm<3> / m<3>, the reaction temperature is 350-450 DEG C, and the volume space velocity is 0.3-1.5 / h. In the process, when coal tar whole-fractions are treated, the yields of naphtha, diesel oil and vacuum gas oil are 85-90 wt % higher than the yield of distillate oil, the yield of unconverted tail oil is less than 10 wt %, the obtained naphtha and diesel oil conform to the national V quality standards, and the vacuum gas oil can be used as a raw material of a catalytic cracking device or a raw material for producing base oil of low-freezing-point special lubricating oil.

Description

technical field [0001] The invention relates to a combined method of coal tar full fraction suspension bed hydrocracking and fixed bed hydrogenation upgrading, which belongs to the process of lightening heavy oil in petroleum processing technology. It mainly uses an oil-soluble compounding agent to suspend The process of treating the whole fraction of coal tar by combining a fixed-bed hydrogenation reactor with a fixed-bed hydrogenation reactor. Background technique [0002] With the continuous and high-speed development of social economy, my country's demand for petroleum products is also increasing. However, petroleum is a non-renewable energy source and is facing a crisis of depletion. In contrast, China has relatively abundant coal reserves, so producing liquid fuel from coal has become a basic direction of coal processing and utilization. [0003] On the other hand, with the rapid growth of the international and domestic steel industry, the coking industry is showing ...

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Problems solved by technology

[0007] The invention provides a combined method of suspended bed hydrocracking and fixed bed hydrogenation upgrading of the whole fraction of coal tar, which solves the problem of low utilization rate of coal tar in the existing coal tar hydrogenation technology, and the colloid and impurities in coal tar Atoms are easy to coke on the surface of the catalyst, which leads to the problem of reduced activity and service life of the catalyst, and the problem of incomplete utilization of coal tar

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