Heterogeneous coal tar suspension bed hydrogenation method

Abstract

The invention discloses a heterogeneous coal tar suspension bed hydrogenation method which comprises the following steps: mixing catalyst oil slurry with full fraction or heavy fraction oil of coal tar and catalyst-containing circulating oil, adding into a suspension bed hydrogenation reactor, and performing hydrocracking reaction, wherein the catalyst is a powdery particle coal tar suspension bed hydrogenation catalyst containing a single-metal active component or composite multi-metal active component of molybdenum, nickel, cobalt, tungsten or iron; separating out light oil from the hydrogenation reaction product, and then directly circulating a large amount of the tail oil containing the catalyst to the suspension bed reactor; and performing catalyst removal treatment on a small amount of the tail oil, recirculating to the suspension bed reactor, and performing further light fraction conversion. The heavy oil is wholly or maximally circulated to realize the maximal, convenient and flexible light oil production from the coal tar having different characteristics and the cyclic utilization of the catalyst, thus greatly improving the utilization efficiency and operating flexibility of the raw materials and the catalyst.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a heterogeneous coal tar suspended bed hydrogenation method for maximum production of engine fuel and chemical raw materials by using coal tar as a raw material. Background technique [0002] Coal tar is an important by-product in the coal pyrolysis and carbonization process. It is a complex mixture. According to the temperature and process of coal pyrolysis and carbonization, coal tar can be divided into low-temperature coal tar, medium-temperature coal tar and high-temperature coal tar. , and their compositions vary greatly. [0003] At present, the conventional processing process of coal tar in my country is to cut various fractions concentrated in components through pretreatment distillation, and then use physical or chemical methods (such as acid-base washing, distillation, polymerization, crystallization methods) to process various fractions to extract vari...

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Problems solved by technology

The disadvantage of these methods is that the coal tar raw material is not fully utilized

[0008] The authorized patent CN101885982A that the applicant applied for earlier provides the coal tar suspension bed hydrogenation method of the heterogeneous catalyst that makes the coal tar raw material produce light oil in a large amount, greatly improves the utilization rate of the raw material and the efficiency of the catalyst, but, During the actual use of this patent, the applicant found that when the source process of the coal tar raw material is different, the coal tar raw material needs to be pretreated to meet the production needs, and the cutting method of the patent CN101885982A is obviously not flexible enough, especially when When the viscosity of the pretreatment object is high, there will be phenomena such as failure to convey

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