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Direct liquefaction process of coal mixed with medium and low temperature coal tar

A technology for direct liquefaction of low-temperature coal tar and coal, which is applied in the petroleum industry, preparation of liquid hydrocarbon mixtures, etc. Effect

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 medium and low temperature coal tar

Method used

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  • Direct liquefaction process of coal mixed with medium and low temperature coal tar
  • Direct liquefaction process of coal mixed with medium and low temperature coal tar
  • Direct liquefaction process of coal mixed with medium and low temperature coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The medium and low temperature coal tar is dehydrated and purified in the purification treatment equipment. The water content of the medium and low temperature coal tar after dehydration is less than 0.5wt%; the medium and low temperature coal tar after the purification treatment is distilled under atmospheric pressure , Cut into light oil fraction and heavy oil fraction, the temperature range of the cutting point is 320℃;

[0029] (2) Bituminous coal pulverized coal is mixed with heavy oil fractions> 320℃ to form an oil-coal slurry with a pulverized coal content of 30wt%. The coal-oil slurry is mixed with 0.03wt% of iron sulfide catalyst and then sent to 10L of hydrogen together with hydrogen. Reaction inside the vessel, reaction pressure is 15MPa, hydrogen partial pressure is 10MPa, reaction temperature is 420℃, volumetric space velocity is 0.25h -1 , The reaction is completed to obtain a first-level reaction product;

[0030] (3) The first-stage reaction product is se...

Embodiment 2

[0032] (1) In the purification treatment equipment, the medium and low temperature coal tar is dehydrated and purified, and the water content of the medium and low temperature coal tar after dehydration is less than 0.5wt%; the medium and low temperature coal tar after the purification treatment is vacuum distilled , Cut into light oil fraction and heavy oil fraction, the cutting point is 340℃;

[0033] (2) Bituminous coal powder and anthracite coal powder with a weight ratio of 1:1 are mixed with heavy oil fractions >340℃ to form a coal-oil slurry with a total coal powder content of 50wt%, and 5wt% ZnCl is mixed into the coal-oil slurry 2 / S catalyst (of which ZnCl 2 It is the active component, S is the auxiliary agent, and the atomic ratio of S to Zn is 0.5) and then sent together with hydrogen into a 10L first-stage reactor for reaction. The reaction pressure is 20MPa, the hydrogen partial pressure is 15MPa, and the reaction temperature is 460℃. , The volumetric space velocity ...

Embodiment 3

[0037] (1) In the purification treatment equipment, the mixture of medium and low temperature coal tar and residual oil is dehydrated and purified, and the residual oil is selected as a mixture of high-sulfur heavy residual oil and high heavy metal content heavy residual oil. The mass ratio of medium and low temperature coal tar, high sulfur heavy residue and high heavy metal content heavy residue is 5:0.5:0.5, and the water content of the mixture after dehydration is less than 0.5wt%; the medium and low temperature coal tar after purification treatment Vacuum distillation, cutting into light oil fraction and heavy oil fraction, the cutting point is 360℃;

[0038] (2) The sub-bituminous coal powder is mixed with heavy oil fractions >360℃ to form an oil-coal slurry with a coal content of 40wt%, and 2wt% of iron-molybdenum metal catalyst is mixed into the coal-oil slurry (the atomic ratio of iron and molybdenum is It is 50), and hydrogen is heated to 100℃ and then mixed and sent fr...

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Abstract

The invention discloses a direct liquefaction process of coal mixed with medium and low temperature coal tar. The process comprises the following steps: carrying out purification treatment on the medium and low temperature coal tar, carrying out vacuum distillation or atmospheric distillation on the medium and low temperature coal tar subjected to purification treatment, and cutting the factions into heavy oil fractions and light oil fractions, wherein the temperature range of the cut point is 320-380 DEG C; subjecting a coal oil mixture obtained by mixing pulverized coal with the heavy oil fractions higher than the cut point, 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, increasing the conversion rate of pulverized coal 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 medium and low temperature coal tar, and belongs to the technical field of coal direct liquefaction. Background technique [0002] Direct coal liquefaction is a technology that directly converts coal into liquid fuel by catalytic hydrogenation at high temperature and high pressure. At present, a variety of direct coal 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 crafts. Among them, China Shenhua Technology built an industrial demonstration device with a capacity of 6000 tons / day and put it into use in 2008. [0003] Through long-term research, it has been found that coal first undergoes a rapid pyrolysis reaction during direct liquefaction to generate a large amount of pre-asphaltene, asphaltene and some small molecular hydrocarbons, CO 2 , CO and othe...

Claims

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Application Information

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