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Separation system and separation method for coal direct liquefaction oil residue

A technology of direct coal liquefaction oil and separation method, applied in the field of coal liquefaction, can solve problems such as difficulty in separation, difficulty in continuous operation of separation equipment, and difficulty in complete separation of components.

Active Publication Date: 2021-04-16
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a separation system and separation method for direct coal liquefaction oil residue, to solve the problem of separation difficulties and continuous operation of separation equipment when the existing treatment methods are used to process the extraction mixture with the above characteristics , the problem that the components are difficult to completely separate

Method used

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  • Separation system and separation method for coal direct liquefaction oil residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] With a weight ratio of 1:2.5, the coal liquefaction oil residue and washing oil are transported to a dynamic mixing device 80 (dynamic mixer) for mixing to obtain a mixed raw material liquid. The above-mentioned mixed raw material liquid is transported to the extraction device 10 for extraction to obtain an extraction mixed liquid, wherein the extraction temperature is 135° C., and the extraction time is 1 h.

[0049] The above-mentioned extraction mixture is pumped to the decanter centrifuge 20 (high-temperature horizontal screw centrifuge) for a first-stage solid-liquid separation, and the decanter clear liquid (the first light phase) and the decanter heavy phase (the first phase) are obtained. heavy phase), wherein the solid content of the decanter supernatant (the first light phase) is controlled below 2wt%, and the separation temperature is 130°C.

[0050] Pump the first light phase of the clear liquid of the decanter to the disc centrifugal device 30 (disc centrif...

Embodiment 2

[0055] The solid of the coal direct liquefaction oil residue is crushed to less than 3mm, and the direct coal liquefaction oil residue and the coking solvent are transported to the extraction device 10 at a weight ratio of 1:5 to obtain an extraction mixed liquid, wherein the temperature of the extraction process is 100°C , the extraction time is 3h.

[0056] The above-mentioned extraction mixed liquid is pumped to a decanter centrifuge 20 (horizontal screw centrifuge) for a first-stage solid-liquid separation to obtain the decanter clear liquid (the first light phase) and the decanter heavy phase (the first phase). Heavy phase), wherein the solid content of the first light phase of the decanter supernatant is controlled below 1.75wt%, and the separation temperature is 100°C.

[0057] The first light phase of the decanter clear liquid is transported to the disc centrifuge device 30 (disc centrifuge) for secondary solid-liquid separation to obtain the disc machine clear liquid ...

Embodiment 3

[0061] The difference from Example 1 is that the supernatant liquid of the disc centrifuge is directly distilled without going through the membrane filtration system.

[0062]The yield of higher grade bitumen with ash content less than 0.5% was obtained at the bottom of the tower, the yield was 93wt%, and the recovery rate of the solvent was 95wt%.

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Abstract

The invention provides a separation system and separation method for direct coal liquefaction oil residue. The separation system includes an extraction device, a decanter centrifugal device, a disc centrifugal device and a distillation device. The extraction device is provided with a feeding port and a slurry outlet; the decanter centrifugal device is provided with a slurry inlet, a first light phase outlet and a first heavy phase outlet, and the slurry inlet and the slurry outlet are connected through a slurry delivery pipeline; the disc centrifugal device is provided with The first light phase inlet, the second light phase outlet and the second heavy phase outlet, the first light phase inlet and the first light phase outlet are connected through the first light phase delivery pipeline; the distillation unit is provided with a second light phase inlet, The second light phase inlet is communicated with the second light phase outlet through the second light phase delivery pipeline. The above separation system is used to separate the coal direct liquefaction oil residue layer by layer, which makes the separation process easier, the separation equipment can be operated continuously, and the efficiency of solid-liquid separation in the extraction mixture of direct coal liquefaction oil residue is improved.

Description

technical field [0001] The invention relates to the field of coal liquefaction, in particular to a separation system and separation method for direct coal liquefaction oil residue. Background technique [0002] The coal direct liquefaction oil residue extraction process is a follow-up process developed on the basis of the coal direct liquefaction process. Oil residue obtained by direct coal liquefaction and vacuum distillation is a high-sulfur, high-ash, high-calorie by-product, which contains liquefied heavy oil, bituminous substances, unconverted coal, minerals in coal, and external catalysts. Coal liquefaction oil residue extraction extracts about 50% of the heavy oil and bituminous substances in the oil residue to obtain different grades of coal liquefaction bitumen, among which high-grade bitumen can be used to prepare carbon materials. [0003] The mixed liquid obtained after extraction of coal liquefaction oil residue usually has high viscosity (contains heavy oil, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/00
CPCC10G53/00
Inventor 王国栋章序文舒歌平李克健向柠程时富常鸿雁
Owner CHNA ENERGY INVESTMENT CORP LTD