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Recycling solvent and preparation method thereof

A technology for recycling solvent and solvent, applied in the field of coal chemical industry, can solve the problems of insufficient hydrogen supply capacity, high hydrogen consumption, harsh process conditions, etc. Effect

Inactive Publication Date: 2017-03-08
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a circulating solvent and its preparation method to solve the problems of high hydrogen consumption, harsh process conditions and insufficient hydrogen supply capacity in the existing hydrogen supply solvents for direct coal liquefaction

Method used

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  • Recycling solvent and preparation method thereof
  • Recycling solvent and preparation method thereof
  • Recycling solvent and preparation method thereof

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preparation example Construction

[0032] In the preparation method provided by the present invention, those skilled in the art can select specific process conditions in the first hydrogenation process. In a preferred embodiment, the first hydrogenation process includes the step of carrying out the first hydrogenation reaction of medium-temperature oil and hydrogen under the action of the first catalyst; wherein, the temperature of the first hydrogenation reaction is 300-380°C , preferably 320-360° C.; the reaction pressure of the first hydrogenation reaction is 10-21 MPa, preferably 16-20 MPa. Limiting the temperature and pressure of the first hydrogenation process within the above range is beneficial to improve the hydrogenation effect of medium temperature oil.

[0033] In a preferred embodiment, the volume ratio of hydrogen to medium temperature oil in the first hydrogenation reaction process is 100-1500, preferably 500-1000; the reaction volume space velocity is 0.5-4.5h -1 , preferably 0.8-2.5h -1 . Li...

Embodiment 1

[0044] Such as figure 1 As shown, the direct liquefied coal fraction oil is subjected to the first fractionation process in the first fractionation tower 10 at a pressure of 0.05 MPa to obtain low-temperature oil, medium-temperature oil and high-temperature oil, wherein the low-temperature oil is a distillate oil less than 200°C. Medium-temperature oil is distillate oil at 200-300°C, and high-temperature oil is distillate oil above 300°C.

[0045] Above-mentioned middle temperature oil enters in the first hydrogenation reactor 30 (fixed-bed reactor) after the first surge tank 20 is stabilized in Ni-Mo / Al 2 o 3 (Ni-M O is the active component, Al 2 o 3 is the carrier) to carry out the first hydrogenation reaction to obtain the first hydrogenation stable oil, wherein the pressure of the first hydrogenation process is 16MPa, the temperature is 320°C, the hydrogen-oil ratio is 800v / v, and the reaction space velocity is 1.5h -1 .

[0046] The above-mentioned high-temperature...

Embodiment 2

[0052] The pressure of the first hydrogenation reaction and the second hydrogenation reaction is 20MPa, and other conditions are the same as in Example 1.

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Abstract

The invention provides a recycling solvent and a preparation method thereof. The preparation method comprises carrying out first fractionation on directly liquefied whole-fraction oil of coal to obtain medium temperature oil and high temperature oil, wherein the medium temperature oil is distillate oil at a temperature of 200-320DEG C and the high temperature oil is distillate oil at the temperature of greater than 320DEG C, carrying out a first hydrogenation reaction process on the medium temperature oil to obtain first hydrogenated stable oil, carrying out a second hydrogenation reaction process on the first hydrogenated stable oil to obtain second hydrogenated stable oil, carrying out second fractionation on the mixture of the first hydrogenated stable oil and the second hydrogenated stable oil to obtain a medium temperature solvent and a high temperature solvent, wherein the medium temperature solvent is distillate oil at a temperature of 200-320DEG C and the high temperature solvent is distillate oil at a temperature of 320-500DEG C, and mixing a part of the medium temperature solvent and the high temperature solvent to obtain the recycling solvent. The preparation method of the recycling solvent has the advantages of low hydrogen consumption, low gas yield and high hydrogen supplying performances.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a circulating solvent and a preparation method thereof. Background technique [0002] The direct coal liquefaction process is to make coal powder, solvent oil, catalyst, etc. into a certain concentration of coal slurry and then mix it with hydrogen, and then enter the coal slurry preheater and coal liquefaction reactor under certain conditions (reaction temperature 400-480 ℃, The reaction pressure is 10-30MPa), and the reaction product is separated in the separation system to obtain gas products, liquefied oil products, and solid residues. [0003] In the existing coal direct liquefaction process, in addition to the physical effects of the solid coal powder slurry in the process of the direct coal liquefaction process, the solvent can improve the material's transportation performance, thermodynamic properties, and dissolve coal pyrolysis products. At the same time, it also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02C10G1/00
CPCC10G1/00C10G67/02C10G2300/1037C10G2300/70C10G2400/30
Inventor 单贤根舒歌平李克健章序文杨葛灵王洪学曹雪萍
Owner CHNA ENERGY INVESTMENT CORP LTD
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