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Direct liquefaction process of coal mixed with high temperature coal tar

A technology for direct liquefaction of high-temperature coal tar and coal is applied in the petroleum industry, hydrotreating process, preparation of liquid hydrocarbon mixtures, etc., and can solve the problems of low production efficiency and low production efficiency of the two-stage hydrogenated coal direct liquefaction process, Achieve the effect of reducing nitrogen content, improving conversion rate and low hydrogen consumption

Active Publication Date: 2015-03-18
任相坤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the production efficiency of the two-stage hydrogenated coal direct liquefaction process in the prior art is very low, and those skilled in the art have not been able to find the reason for the low production efficiency of the process; Coal direct liquefaction process mixed with high temperature coal tar

Method used

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  • Direct liquefaction process of coal mixed with high temperature coal tar
  • Direct liquefaction process of coal mixed with high temperature coal tar
  • Direct liquefaction process of coal mixed with high temperature coal tar

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Purify the high-temperature coal tar by dehydrating and removing impurities in the purification treatment equipment. The water content of the dehydrated high-temperature coal tar is less than 0.5wt%; the purified high-temperature coal tar is subjected to atmospheric distillation and cut into 350°C heavy oil fraction;

[0029] (2) Bituminous coal pulverized coal and heavy oil fraction >350°C are mixed to form coal oil slurry with a coal powder content of 30wt%, and 0.03wt% iron sulfide catalyst is mixed into the oil coal slurry and sent to 10L of first-stage reaction together with hydrogen. The reaction in the vessel, the reaction pressure is 15MPa, the hydrogen partial pressure is 10MPa, the reaction temperature is 420℃, and the volume space velocity is 0.25h -1 , the reaction finishes to obtain the first-order reaction product;

[0030] (3) The first-stage reaction product is sent to the upper part of the 8L second-stage reactor, the gas phase components in the firs...

Embodiment 2

[0032] (1) Purify the high-temperature coal tar by dehydration and impurity removal in the purification treatment equipment. The water content of the high-temperature coal tar after dehydration is less than 0.5wt%; the purified high-temperature coal tar is subjected to atmospheric distillation and cut into pieces. Light oil fractions 350°C;

[0033] (2) Bituminous coal pulverized coal and anthracite pulverized coal in a weight ratio of 1:1 are mixed with heavy oil fractions >350°C to form an oil-coal slurry with a total coal powder content of 50 wt%, and 5 wt% ZnCl is mixed into the oil-coal slurry 2 / S catalyst (in which ZnCl 2 It is an active component, S is an auxiliary agent, and the atomic ratio of S and Zn is 0.5) and then sent to a 10L primary reactor together with hydrogen for reaction. The reaction pressure is 20MPa, the hydrogen partial pressure is 15MPa, and the reaction temperature is 460℃ , the volumetric air velocity is 0.25h -1 , the reaction finishes to obtai...

Embodiment 3

[0037] (1) Purify the mixture of high-temperature coal tar, high-sulfur heavy residual oil, and high-heavy-metal-content heavy residual oil in purification treatment equipment, wherein the high-temperature coal tar, high-sulfur heavy residual oil, high-temperature coal tar, high-sulfur heavy The mass ratio of heavy metal content to heavy residual oil is 5:0.5:0.5, and the water content of the dehydrated mixture is less than 0.5wt%; the purified oil is subjected to atmospheric distillation, and cut into light oil fractions of 350 ℃ heavy oil fraction;

[0038] (2) Mix sub-bituminous coal pulverized coal with heavy oil fraction > 350°C to form an oil-coal slurry with a coal powder content of 40wt%, and mix 2wt% of iron-molybdenum metal catalyst (wherein the atomic ratio of iron and molybdenum) into the oil-coal slurry. 50), hydrogen and heated to 100°C, mixed together and sent to a 10L primary reactor from the bottom for reaction, the reaction pressure was 18MPa, the hydrogen p...

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Abstract

The invention discloses a direct liquefaction process of coal mixed with high temperature coal tar. The process comprises the following steps: carrying out purification treatment on the high temperature coal tar, carrying out vacuum distillation or atmospheric distillation on the high temperature coal tar subjected to purification treatment, and cutting the factions into light oil fractions at a temperature lower than 350 DEG C and heavy oil fractions at a temperature higher than 350 DEG C; subjecting a coal oil mixture obtained by mixing pulverized coal with the heavy oil fractions at a temperature higher than 350 DEG C, hydrogen and a catalyst to reaction in a primary reactor at a reaction temperature of 420-460 DEG C, sending a primary reaction product to the upper part of a secondary reactor, enabling a gas phase component in the primary reaction product to flow out from the top of the secondary reactor, enabling solid and liquid components in the primary reaction product to flow down in the secondary reactor to carry out countercurrent contact reaction with hydrogen flowing up at a reaction temperature of 430-480 DEG C, and carrying out fractional distillation after the reaction ends. The process has the effects of obviously improving the production efficiency of direct coal liquefaction and improving the quality of naphtha and diesel products, and is suitable for the large-scale direct coal liquefaction industry.

Description

technical field [0001] The invention relates to a coal direct liquefaction process mixed with high-temperature coal tar, belonging to the technical field of coal direct liquefaction. Background technique [0002] Coal direct liquefaction is a technology that directly converts coal into liquid fuel through catalytic hydrogenation under high temperature and high pressure. At present, a variety of coal direct liquefaction processes have been successfully developed in the world, including the German IGOR process, the American H-Coal process, and the Japanese NEDOL process. and China Shenhua Craft. Among them, China Shenhua Technology built a 6,000-ton / day industrial demonstration device in 2008 and put it into use. [0003] Through long-term research, it has been found that in the direct liquefaction of coal, a large amount of pre-asphaltenes, asphaltenes and some small molecular hydrocarbons, CO 2 , CO and other gases, and then the pre-asphaltene and asphaltene will continue ...

Claims

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Application Information

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IPC IPC(8): C10G1/06C10G67/00C10G67/02
CPCC10G1/06C10G67/00C10G67/02
Inventor 井口宪二坂脇弘二
Owner 任相坤
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