Coal direct liquefaction circulating solvent and its preparation method and application

Abstract

The invention provides a direct coal liquefaction cycle solvent, a preparation method of the direct coal liquefaction cycle solvent and application of the direct coal liquefaction cycle solvent. The preparation method comprises the steps of S1, carrying out hydrogenation on a mixture of petroleum refining secondary products and direct coal liquefaction oil, and obtaining a hydrogenation product, S2, fractionating the hydrogenation product, and obtaining light distillate oil, medium distillate oil and heavy distillate oil, and S3, mixing the heavy distillate oil with a part of the medium distillate oil, and obtaining the direct coal liquefaction cycle solvent. In the preparation method of the direct coal liquefaction cycle solvent, on one hand, a large amount of arene is contained in the petroleum refining secondary products, the hydrogenation product is rich in components such as tetrahydronaphthalene, therefore, the hydrogen supplying capacity of the direct coal liquefaction cycle solvent can be obviously improved, and the yield of the direct coal liquefaction oil is improved; on the other hand, a part of high-added-value diesel distillate with the boiling range lower than 350 DEG C in the direct coal liquefaction cycle solvent is substituted with the petroleum refining secondary products, the diesel yield is improved, the economical efficiency of the coil liquefaction technology is remarkably improved, and the problem that an existing cycle solvent gets light can be solved.

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

[0008] Summarizing the existing technology, it can be found that there is still no preparation method of coal direct liquefaction circulating solvent that can improve the economic performance of coal liquefaction and improve the hydrogen supply performance of direct coal liquefaction circulating solvent

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