Preparation method of initiating solvent for direct liquefy of coal

Abstract

The invention discloses a preparing method of coal direct liquefied initial solvent, which comprises the following steps: adopting oil distillate with distillation range at 220-538 deg.c, specific gravity at 1.01-1.10 g per cm3 and condensed-nuclei aromatics content over 70 percent; preparing coal direct liquefied initial solvent with distillation range at 220-480 deg.c, specific gravity at 0.95-0.99 g per cm3 and condensed-nuclei aromatics content over 80 percent through catalytic hydrogenation course. The method possesses excellent hydrogen supplying property and fitful viscosity, which can satisfy the direct liquefied need for coal slurry.

Description

technical field

[0001] The invention relates to a coal direct liquefaction process, more specifically, a preparation method for an initial solvent used in a coal direct liquefaction process. Background technique

[0002] In the direct coal liquefaction process, the role of the solvent is very important, and it reduces the polymerization reaction in two ways. The first is physically, dissolving the free radical fragments produced by the reaction in a solvent. Therefore, the solvent needs to have good solubility for heavy aromatics; secondly, the second way for the solvent to prevent the polymerization reaction is to donate hydrogen to the free radical, making it a stable molecule. During the normal operation of the direct coal liquefaction process, the solvent comes from a certain fraction of the process itself, so that it can be recycled in the direct coal liquefaction process, so it is also called circulating solvent.

[0003] When the direct coal liquefaction unit starts...

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