Method for producing lightweight fuel oil by hydrogenation of deep drawn anthracene oil

Abstract

The present invention provides a method for producing lightweight fuel oil by hydrogenation of deep drawn anthracene oil. The method comprises the following steps: hydrofinishing deep drawn anthracene oil; returning part of the liquid phase products obtained by gas-liquid separation to the hydrofinishing reaction zone and mixing with anthracene oil; adding the residual products into a hydrocracking reaction zone, conducting contact reaction with hydrobon catalysts, hydrogenation charcoal-removing catalysts and hydracracking catalysts successively; separating the obtained hydrocracking products; to obtain the fractions of gasoline and diesel oil. The method not only can process deep drawn anthracene oil, broadens the scope of raw materials; but also can maximize the conversion of deep drawing anthracene oil, thereby, improves the yield of lightweight fuel oil, raises the added value of anthracene oil, effectively protects the activity of hydrocracking catalysts simultaneously, and guarantees the long-time cycle running of a device. Furthermore, adopting the mode of portion cycle is favorable to reducing temperature rise, reducing equipment investment and enhancing safety and smoothness of device operation; simultaneously, reduction of the concentration of colloid and asphalt is in favor of prolongation of the running period of the device.

Description

technical field [0001] The invention relates to a method for hydrogenating deep carbinthrene oil, in particular to a method for hydrogenating deep carbinthrene oil to produce clean light fuel oil. Background technique [0002] Coal tar is a by-product of coking technology, and anthracene oil is one of its distillation products. Generally, the fraction at 300-360°C is called I anthracene oil, the fraction at 360-500°C is called II anthracene oil, and the fraction above 500°C belongs to asphalt components. In recent years, coal tar hydrogenation has attracted much attention in the coal chemical industry. The dry point of hydrogenation raw materials is generally less than 500-550°C. As a processing raw material that needs to increase added value, asphalt components are currently only used as electrodes and carbon raw materials. The economy is slightly worse (see "Development and Utilization of Coal Tar Pitch and Its Prospect", "Entrepreneur's World" No. 8, 2007). At present, t...

AI Technical Summary

Problems solved by technology

[0005] CN101024780A uses conventional anthracene oil as raw material to produce high-quality diesel oil. It adopts a series process of hydrofinishing-hydrocracking. The ammonia and water generated in the process of hydrofinishing have adverse effects on the activity and stability of subsequent hydrogenation catalysts, affecting the device operating cycle, can not process deep dipanthracene oil

CN101033409A refines and produces oil with a nitrogen content of <400 μg / g, and CN1676583A tail oil directly enters the hydrocracking reactor. These two methods have the same problem: the nitrogen-containing compounds that are difficult to remove are concentrated in the heavy fraction as the hydrocracking feed In the conventional hydrotreating catalyst and hydrogenation conditions, it is difficult to make the nitrogen content in the heavy fraction meet the feed requirements of hydrocracking

These two methods can not process deep dipanthracene oil

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