Direct coal liquefaction circulation solvent and preparation method and application of direct coal liquefaction circulation solvent

Abstract

The invention provides a direct coal liquefaction circulation solvent and a preparation method and application of the direct coal liquefaction circulation solvent. The preparation method comprises the steps that S1, hydrogenation is carried out on a mixture of coal tar anthracene oil and direct coal liquefaction oil to obtain a hydrogenation product, S2, fractionation is carried out on the hydrogenation product to obtain light-weight distillate oil, middle-weight distillate oil and heavy-weight distillate oil, and S3, the heavy-weight distillate oil is mixed with a part of middle-weight distillate oil to obtain the direct coal liquefaction circulation solvent. According to the preparation method, on one hand, a large amount of aromatic hydrocarbon is contained in the coal tar anthracene oil, the hydrogenation product is rich in components such as tetrahydronaphthalene, therefore, the hydrogen supply capacity of the circulation solvent can be obviously improved, and the yield of direct coal liquefaction oil is improved; on the other hand, a part of high value-added gas and diesel oil distillate with the boiling range lower than 350DEG C in the direct coal liquefaction circulation solvent is substituted with the coal tar anthracene oil, the diesel oil yield is improved, in addition, the light-weight problem of an existing circulation solvent can be relieved, and deposition and coking of materials in a reactor in the direct coal liquefaction technological process are relieved.

Description

technical field [0001] The invention relates to the field of coal liquefaction, in particular to a direct coal liquefaction circulating solvent and its preparation method and application. Background technique [0002] The direct liquefaction of coal to produce liquid fuel is an important way for the clean conversion and efficient utilization of coal, and it is also one of the effective methods to make up for the shortage of petroleum resources. As a strategic energy reserve technology, direct coal liquefaction has been highly valued by developed countries, and advanced coal direct liquefaction processes such as NEDOL, IGOR and HTI have been successfully developed. Many domestic units have also carried out research on the direct coal liquefaction process. Shenhua Group Co., Ltd. applied for a Chinese patent CN200410070249 for a direct coal liquefaction method in 2004. In 2008, it built a 1 million tons / year coal direct liquefaction demonstration device in Ordos and successfu...

AI Technical Summary

Problems solved by technology

[0007] Summarizing the existing technology, it can be found that there is still no method for preparing a direct coal liquefaction circulating solvent that can both improve the economic performance of coal liquefaction and improve the hydrogen supply performance of the direct coal liquefaction circulating solvent

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