Coal tar processing and coal co-processing combined process

Abstract

A coal tar processing and coal co-processing combined process includes steps: firstly, subjecting a coal tar light component to phenol extraction treatment; then, subjecting coal tar heavy distillateto prehydrogenation to promote conversion of colloid and asphaltene in heavy distillate into partially hydrogenated polyaromatic hydrocarbon, so that the hydrogen supply performance of the heavy distillate can be improved; finally, mixing liquid-phase products in different distillation ranges in a separator after hydrogenation with coal powder, and adding into a coal-oil co-processing device to obtain gasoline, diesel and phenol products, so that coal tar and coal co-processing is realized. By combination of coal tar phenol extraction, heavy distillate prehydrogenation and coal-oil co-processing processes, quality-based utilization of coal tar is realized, a great quantity of solvent oil with the great hydrogen supply performance is provided for coal-oil co-processing, the coal tar and coal conversion efficiency is remarkably improved, and the process has advantages of low hydrogen consumption, high oil yield, great economic benefits and benefits to long-period large-scale operation ofa coal-oil co-processing device and the like.

Description

Technical field [0001] The invention belongs to the technical field of chemical industry, and particularly relates to a combined process of coal tar processing and coal co-refining. Background technique [0002] Coal liquefaction technology refers to advanced coal cleaning technology that converts coal into liquid fuels, chemical raw materials and products through deep hydrocracking reactions under the action of hydrogen and catalysts. my country is a big coal producer and a big consumer of fuel oil. The dependence on crude oil is close to 60%. Therefore, the development of coal hydroliquefaction technology is to realize the clean and efficient utilization of coal resources, ensure the safety of my country’s energy environment, and alleviate my country’s environment. One of the important methods of pollution status. [0003] Shenhua Group has developed a direct coal liquefaction (CDCL) technology (Chinese patent 1587351) with my country's independent property rights, achieving a pr...

AI Technical Summary

Problems solved by technology

Untreated full-fraction coal tar partially hydrogenated has low polycyclic aromatic hydrocarbon content, poor hydrogen supply capacity, and contains a large amount of colloidal asphaltenes. Therefore, according to the patent CN104419437A, the coal and coal tar are directly liquefied. Although it can Realize the co-processing of coal and coal tar, but in the process of processing high-colloid and bituminous coal tar, it faces problems such as low conversion rate and easy coking of reactants. At the same time, coal tar contains high oxygen compounds, of which phenol and its derivatives The content of these phenols can reach 8%-30%. These phenols have high economic value, and the direct hydrogenation reaction will increase the hydrogen consumption in the reaction process, and the economic benefit is low.

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