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Coal direct liquefying and circulating solvent and preparation method thereof

A technology of direct coal liquefaction and coal direct liquefaction of oil, which is applied in the field of coal chemical industry, can solve the problems of high hydrogen consumption and poor hydrogen supply performance, and achieve the effects of reducing volume, improving hydrogen supply performance and increasing yield

Active Publication Date: 2016-09-07
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide a direct coal liquefaction circulating solvent and its preparation method to solve the technical problems of high hydrogen consumption and poor hydrogen supply performance in the processing method of coal direct liquefaction circulating solvent in the prior art

Method used

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  • Coal direct liquefying and circulating solvent and preparation method thereof
  • Coal direct liquefying and circulating solvent and preparation method thereof
  • Coal direct liquefying and circulating solvent and preparation method thereof

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preparation example Construction

[0024] According to a typical embodiment of the present invention, a method for preparing a circulating solvent for direct coal liquefaction is provided. The preparation method comprises the following steps: S1, performing fractional distillation on the direct coal liquefaction oil under the condition of a pressure of 0.02-0.2 MPa to obtain the first-grade low-temperature oil, the first-grade medium-temperature oil and the first-grade high-temperature oil; S2, the first-grade high-temperature oil Perform hydrogenation and fractionation to obtain secondary low-temperature oil, secondary medium-temperature oil, and secondary high-temperature oil; S3, mix all secondary high-temperature oil with part of the first-level medium-temperature oil and secondary medium-temperature oil to obtain coal directly Liquefied circulating solvent, wherein, the distillation range of the first-grade low-temperature oil and the second-grade low-temperature oil is 320°C.

[0025] In the present inven...

Embodiment 1

[0035] Such as figure 1 As shown, in this embodiment, the preparation device for direct coal liquefaction circulating solvent consists of a fractionation tower 10, a buffer tank 20, a hydrogenation reactor 30, a high temperature separator 40, a low temperature separator 50, a fractionation tower 60 and a hydrogen circulation compressor 70 composition.

[0036] The coal direct liquefaction full distillate oil from the coal direct liquefaction unit, that is, the coal direct liquefaction oil, enters the fractionation tower 10 and is cut into three fractions: first-grade low-temperature oil, first-grade medium-temperature oil and first-grade high-temperature oil. Among them, the primary high-temperature oil enters the buffer tank 20 as a raw material for subsequent hydrogenation. The secondary high-temperature oil from the bottom of the buffer tank 20 is mixed with hydrogen and enters the hydrogenation reactor 30 for hydrogenation reaction. The hydrogenated product from the hydr...

Embodiment 2

[0044] With other conditions unchanged, change the reaction temperature of the ebullated bed hydrogenation reactor to 400°C, and the reaction space velocity to 1h -1 Hydrogenation stabilization is carried out under certain conditions to obtain hydrogenation-stabilized oil. The obtained high-temperature oil and part of the medium-temperature oil are prepared according to the ratio of 2:7 to make the coal direct liquefaction circulating solvent.

[0045] The hydrogenation catalyst used in the present invention is the same as embodiment 1

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Abstract

The invention discloses a coal direct liquefying and circulating solvent and a preparation method thereof. The preparation method comprises the following steps: step one, subjecting oil obtained by directly liquefying coal to fractionation under a pressure of 0.02 to 0.2 MPa to obtain primary low temperature oil, primary middle temperature oil, and primary high temperature oil; step two, subjecting primary high temperature oil to hydrogenation and fractionation to obtain secondary low temperature oil, secondary middle temperature oil, and secondary high temperature oil; step three, mixing all secondary high temperature oil, part of primary middle temperature oil, and part of secondary middle temperature oil according to a certain ratio to obtain the coal direct liquefying and circulating solvent; wherein the boiling ranges of the primary low temperature oil and secondary low temperature oil are under 200 DEG C; the boiling ranges of primary middle temperature oil and secondary middle temperature oil are in a range of 200 to 320 DEG C, and the boiling ranges of primary high temperature oil and secondary high temperature oil are above 320 DEG C. The provided preparation method has the advantages that the coal conversion rate and oil yield of coal direct liquefying technology can be improved, the loss of light oil products is reduced at the same time, and moreover, the discharge of slag is reduced.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a coal direct liquefaction 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 successively. Under certain conditions (reaction temperature 400-450 ℃, reaction pressure 10-30MPa) to react successively, and separate the reaction products in the separator to obtain gas products, liquefied oil products, and solid residues respectively. [0003] In the existing coal direct liquefaction process, in addition to the physical effects of the solid coal powder slurry to improve the material transportation performance, thermodynamic properties, and dissolved coal pyrolysis products, the solvent is used in the coal direct li...

Claims

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Application Information

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IPC IPC(8): C10G67/02C10G1/00
CPCC10G1/00C10G67/02C10G2300/1037C10G2400/18
Inventor 单贤根李克健章序文王洪学曹雪萍
Owner CHNA ENERGY INVESTMENT CORP LTD
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