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Method for separating bituminous substances from coal direct liquefaction residues

A technology of direct coal liquefaction and pitch, which is applied in the processing of tar pitch/petroleum pitch/natural pitch, the processing of tar pitch/petroleum pitch/natural pitch by selective extraction, and the petroleum industry, etc., which can solve the problem of high cost and low yield. and other problems to achieve the effect of reducing cost and improving extraction rate

Active Publication Date: 2013-08-14
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims to provide a method for separating bituminous substances from coal direct liquefaction residues, so as to solve the technical problems of high cost and low yield in the separation of bituminous substances in the prior art

Method used

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  • Method for separating bituminous substances from coal direct liquefaction residues
  • Method for separating bituminous substances from coal direct liquefaction residues

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Embodiment approach

[0029] According to a typical implementation of the present invention, step S1 includes: S11, mixing the coal direct liquefaction residue and the extraction solvent according to a mass ratio of 1:1-10 to obtain a mixed solution; and S12, passing N into the mixed solution 2 or H 2 , and at 0.1-1.0MPa, heat the mixture to 50-280°C at 10°C-30°C / h, stir, extract, and heat-dissolve; the extraction time is 5-60min, and the stirring rate is 50-300r / min . In the present invention, the coal direct liquefaction residue and the extraction solvent are mixed according to a mass ratio of 1:1 to 10 to ensure the extraction effect and solvent recovery rate. If the mass ratio is higher than 1:1, the extraction solvent cannot completely liquefy the coal directly. The dissolution of asphalt substances in the residue leads to incomplete extraction; if the mass ratio is lower than 1:10, it will cause waste of extraction solvent and increase the recovery cost of subsequent extraction solvent. Inj...

Embodiment 1

[0037] 1) Add 250kg of coal direct liquefaction residue and 250kg of naphthalene oil (distillation range 120°C to 210°C) into the stirring tank, stir at a speed of 50r / min, and fill the stirring tank with N 2 After the pressure in the stirred tank reached 0.1 MPa, the temperature was raised to 50° C. at a rate of 10° C. per hour, stirred at a constant temperature, and subjected to hot-melt extraction for 30 minutes to obtain a hot-melt extraction mixture.

[0038] 2) Separation of solid and liquid from hot solution extraction mixture by means of hot pressure filtration. The primary filtration temperature is 150°C, the filtration pressure is 0.2MPa, and the pore size of the filter core is 50μm. After primary filtration, the primary extract and primary raffinate are collected. Part of the primary extract is sent to the secondary filter for hot-press filtration. The filtration temperature is 150°C, the filtration pressure is 0.15MPa, and the pore size of the filter element is 2 ...

Embodiment 2

[0042] 1) Add 250kg of coal direct liquefaction residue and 750kg of washing oil (distillation range 150-280°C) into the stirring tank, stir at a speed of 300r / min, and fill the stirring tank with N 2 After the pressure in the stirred tank reached 1.0 MPa, the temperature was raised to 280° C. at a rate of 30° C. per hour, stirred at a constant temperature, and hot-melted extraction was carried out for 60 minutes to obtain a hot-melted extraction mixture.

[0043] 2) Separation of solid and liquid from hot solution extraction mixture by means of hot pressure filtration. The primary filtration temperature is 120°C, the filtration pressure is 0.4MPa, and the pore size of the filter core is 40μm. After primary filtration, the primary extract and primary raffinate are collected. Part of the primary extract is sent to the secondary filter for hot-press filtration. The filtration temperature is 180°C, the filtration pressure is 0.3MPa, and the pore size of the filter element is 1 μ...

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Abstract

The invention discloses a method for separating bituminous substances from coal direct liquefaction residues and an application thereof. The method comprises the following steps of: S1) mixing the coal direct liquefaction residues with an extraction solvent, and performing hot solution extraction to obtain a hot solution extraction mixture; S2) performing solid-liquid separation on the hot solution extraction mixture to obtain an extraction solution; and S3) performing solvent recovery on the extraction solution to obtain the bituminous substances, wherein the extraction solvent is coal tar or coal tar distillate. The coal tar or the coal tar distillate is taken as the extraction solvent for separating the coal direct liquefaction residues to prepare the bituminous substances, so that the extraction rate is improved, the cost is reduced, the mixture of the bituminous substances with appropriate volatile components and higher softening point is obtained, and the bituminous substances in the mixture can be used as raw materials of different grades of carbon materials according to different natures.

Description

technical field [0001] The invention relates to the technical field of deep processing of coal liquefaction residues, in particular to a method for separating bituminous substances from direct coal liquefaction residues. Background technique [0002] With the rapid development of the national economy, the process of modernization and social development continues to accelerate, my country's consumption of petroleum products continues to grow, greatly exceeding the growth rate of crude oil production during the same period, resulting in an increase in our petroleum imports year by year, and has exceeded the natural Yield. However, my country is a country rich in coal and poor in oil. Making full use of abundant coal resources and developing advanced clean coal technologies such as direct coal liquefaction is one of the important ways to reduce the excessive dependence on foreign crude oil and alleviate the shortage of my country's oil resources and the tight supply and demand o...

Claims

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Application Information

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IPC IPC(8): C10C3/08C10C3/00
Inventor 程时富李克健章序文武天翔
Owner CHNA ENERGY INVESTMENT CORP LTD
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