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A direct coal liquefaction process mixed with medium and low temperature coal tar

A low-temperature coal tar and coal direct liquefaction technology, which is applied in the petroleum industry and the preparation of liquid hydrocarbon mixtures, etc., can solve the problems of low production efficiency and low production efficiency of the two-stage hydrogenated coal direct liquefaction process, and achieve the goal of improving the conversion rate Effect

Active Publication Date: 2016-06-29
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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  • A direct coal liquefaction process mixed with medium and low temperature coal tar
  • A direct coal liquefaction process mixed with medium and low temperature coal tar
  • A direct coal liquefaction process 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, and the water content of the dehydrated medium and low temperature coal tar is less than 0.5wt%; the purified medium and low temperature coal tar is distilled at atmospheric pressure , cut into light oil fraction and heavy oil fraction, the temperature range of the cutting point is 320°C;

[0029] (2) Bituminous coal powder is mixed with heavy oil fraction >320°C to form an oil-coal slurry with a coal powder content of 30wt%, and 0.03wt% iron sulfide catalyst is mixed into the oil-coal slurry, and then sent together with hydrogen into 10L of first-order reaction In-vessel reaction, the reaction pressure is 15MPa, the hydrogen partial pressure is 10MPa, the reaction temperature is 420°C, and the volume space velocity is 0.25h -1 , the reaction is completed to obtain a first-order reaction product;

[0030] (3) The primary reaction product is sent to the upper ...

Embodiment 2

[0032] (1) The medium and low temperature coal tar is dehydrated and purified in the purification treatment equipment, and the water content of the dehydrated medium and low temperature coal tar is less than 0.5wt%; the purified medium and low temperature coal tar is vacuum distilled , cut into light oil fraction and heavy oil fraction, the cut point is 340°C;

[0033] (2) Bituminous coal powder and anthracite coal powder with a weight ratio of 1:1 are mixed with heavy oil fractions > 340°C to form an oil-coal slurry with a total coal powder content of 50wt%, and 5wt% ZnCl is mixed into the oil-coal slurry 2 / S catalyst (where 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 together with hydrogen into a 10L primary reactor for reaction, the reaction pressure is 20MPa, the hydrogen partial pressure is 15MPa, and the reaction temperature is 460°C , the volume space velocity is 0.25h -1 , the reaction is complet...

Embodiment 3

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

[0038] (2) Mix sub-bituminous coal powder and heavy oil fraction >360°C to form an oil-coal slurry with a coal powder content of 40wt%, and mix 2wt% iron-molybdenum metal catalyst into the oil-coal slurry (the atomic ratio of iron and molybdenum is 50), hydrogen, heated to 100°C and mixed together from the bottom into a 10L primary ...

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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, 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/06
CPCC10G1/06
Inventor 井口宪二坂脇弘二
Owner 任相坤
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