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Coal direct liquefaction circulating hydrogen supply solvent and its preparation method

A technology of direct coal liquefaction and coal direct liquefaction of oil, which is applied in the fields of hydrogenation treatment process, petroleum industry, and hydrocarbon oil treatment, can solve the problem of poor hydrogen supply capacity of circulating hydrogen supply solvent, and improve the conversion rate of coal and oil The effect of improving the yield, improving the hydrogen supply capacity, and improving the dissolution and dispersibility

Active Publication Date: 2017-04-12
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a direct coal liquefaction circulating hydrogen supply solvent and its preparation method, so as to solve the problem of poor hydrogen supply capacity of the circulating hydrogen supply solvent in the prior art

Method used

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  • Coal direct liquefaction circulating hydrogen supply solvent and its preparation method
  • Coal direct liquefaction circulating hydrogen supply solvent and its preparation method
  • Coal direct liquefaction circulating hydrogen supply solvent and its preparation method

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preparation example Construction

[0024] As described in the background technology section, the polycyclic aromatic hydrocarbons in the recycled hydrogen-donating solvent produced by the existing process are not fully partially saturated, which leads to poor hydrogen-donating capacity of the recycled hydrogen-donating solvent, which in turn affects coal Conversion and oil yield during direct liquefaction. In order to solve this problem, the present invention provides a method for preparing a circulating hydrogen-supplying solvent for direct coal liquefaction, which includes the following steps: S1, performing the first catalytic hydrogenation of direct coal liquefaction oil to obtain the first gas phase product and the second One liquid phase product; S2, fractionate the first liquid phase product to obtain light distillate oil, middle distillate oil and heavy distillate oil; S3, carry out the second catalytic hydrogenation of part or all of the heavy distillate oil process, to obtain the second liquid phase p...

Embodiment 1

[0039] Such as figure 1 As shown, the direct coal liquefaction whole distillate oil is passed into the first buffer tank 110, after being boosted by the first high-pressure raw material pump 101, it is mixed with hydrogen, and then enters the first raw material heating furnace 120, and is heated to raise the temperature. The first raw material heating furnace 120 The outlet temperature is 250°C; the heated oil-gas mixture enters the first hydrogenation reactor 130 (fixed-bed reactor), and the bottom of the first hydrogenation reactor 130 is equipped with a first forced circulation pump 103. In the first hydrogenation reactor 130 Catalytic hydrogenation reactions, including partial saturation of aromatics and removal of heteroatoms, etc.

[0040] The material at the outlet of the first hydrogenation reactor 130 (fixed bed reactor) enters the first hot high-pressure separator 140 after being cooled by heat exchange, and the temperature of the first hot high-pressure separator 14...

Embodiment 2

[0045] Such as figure 1 As shown, the coal direct liquid whole distillate oil is passed into the first buffer tank 110 as a raw material, after being boosted by the first high-pressure raw material pump 101, it is mixed with hydrogen gas, and then enters the first raw material heating furnace 120, and is heated to raise the temperature. The outlet temperature of the furnace 120 is 250°C; the heated oil-gas mixture enters the first hydrogenation reactor 130 (fixed bed reactor), and the bottom of the first hydrogenation reactor 130 is equipped with a first forced circulation pump 103. Catalytic hydrogenation reaction is carried out in the device 130, which includes partial saturation of aromatic hydrocarbons and removal of heteroatoms.

[0046] The material at the outlet of the first hydrogenation reactor 130 (fixed bed reactor) enters the first hot high-pressure separator 140 after being cooled by heat exchange, and the temperature of the first hot high-pressure separator 140 i...

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Abstract

The invention provides a direct-coal-liquefied circulating hydrogen-donor solvent and a preparation method thereof. The preparation method comprises the following steps: (S1) carrying out first-time catalytic hydrogenation on a direct-coal-liquefied effluent so as to obtain a first gas-phase product and a first liquid-phase product; (S2) carrying out fractional distillation on the first liquid-phase product so as to obtain a light oil fraction, a medium oil fraction and a heavy oil fraction; (S3) carrying out second-time catalytic hydrogenation on part or all of the heavy oil fraction so as to obtain a second liquid-phase product; (S4) mixing the second liquid-phase product with part or all of the medium oil fraction so as to form the direct-coal-liquefied circulating hydrogen-donor solvent, wherein the distillation range of the light oil fraction is lower than 200 DEG C, the distillation range of the medium oil fraction is 200-350 DEG C, and the distillation range of the heavy oil fraction is higher than 350 DEG C. According to the preparation method, the dissolution, dispersion and hydrogen supply effects of the circulating hydrogen-donor solvent during direct coal liquefaction reaction can be improved, and the conversion rate of coal and yield of oil are further increased.

Description

technical field [0001] The invention relates to the technical field of direct coal liquefaction, in particular to a circulating hydrogen supply solvent for direct coal liquefaction and a preparation method thereof. Background technique [0002] Coal direct liquefaction refers to the process of coal hydrocracking in the presence of high temperature and high pressure, hydrogen, solvent and catalyst to produce liquid products. The solvent is an important medium in the process of coal liquefaction reaction. The main functions of the solvent include: the solvent and coal are mixed into coal slurry, which is convenient for coal transportation and pressurization; it can dissolve coal and prevent the condensation of free radical fragments produced by coal pyrolysis, thereby improving Coal liquefied oil yield; can dissolve gas phase hydrogen, make hydrogen molecules diffuse to the surface of coal or catalyst; can directly supply hydrogen or transfer hydrogen to free radical fragments...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/14
Inventor 李克健高山松白雪梅单贤根杨葛灵章序文李永伦王洪学姜元博
Owner CHNA ENERGY INVESTMENT CORP LTD
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