Hydrofining method for coal liquefaction oil used as fuel for mechanical industry

Abstract

The invention discloses a hydrofining method for coal liquefaction oil used as a fuel for the mechanical industry. The hydrofining method includes the following steps: the filtered coal liquefaction oil and hydrogen respectively enter a stable hydrogenation reaction device from the upper part of a reactor, and are in contact with a hydrogenation catalyst and a hydrogenation protective agent; a hydrogenation device raw material buffer tank is arranged, the volume of the hydrogenation device raw material buffer tank is enlarged, and nitrogen sealing is arranged; an alkadiene removal reactor is arranged in front of the hydrogenation device reactor; effluents from the stable hydrogenation reaction device sequentially pass through a high-pressure separator, a low-pressure separator, and a fractionating tower; a circulating oil line is arranged from a base oil outlet of the fractionating tower to the raw material buffer tank, so as to ensure a stable feeding flow of the hydrogenation device. The hydrofining method can be applied to the field of gasoline hydrogenation, so as to achieve remarkable social and economic benefits.

Description

technical field [0001] The invention relates to a hydrofinishing method of coal liquefied oil used as fuel in machinery industry. Background technique [0002] Coal liquefaction technology has a history of nearly a hundred years. As early as 1913, Germany had already started the research on the technology of producing liquid hydrocarbon products by direct liquefaction of coal, and industrialized the technology of direct liquefaction of lignite to produce gasoline in 1927. Since the first world oil crisis occurred in 1973, the direct coal liquefaction technology has been valued by developed countries, and many direct coal liquefaction processes have been developed successively, among which the more representative processes are the HTI process developed by the United States and the IGOR process developed by Germany. And the NEDOL process developed in Japan. [0003] The same as hydrogenation of delayed coking oil, coal liquefied oil has many similar properties. CN1109495A di...

AI Technical Summary

Problems solved by technology

It is described that the material passes through an adsorbent bed containing alumina and silica, and absorbs and removes silicon compounds at a suitable temperature. This method has a long process flow, and caustic alkali is required for the regeneration of the desorbent, causing unnecessary environmental pollution.

The above desiliconization method is not suitable for naphtha hydrogenation unit