Treatment method for direct coal liquefaction residues

A technology of direct coal liquefaction and treatment method, which is applied in the field of coal chemical industry, can solve the problem of low additional income value, avoid high cost and realize the effect of large-scale industrial production application

Active Publication Date: 2015-08-19
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present invention is to provide a treatment method for coal direct liquefaction residue, to solve the problem of low additional income

Method used

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  • Treatment method for direct coal liquefaction residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Mix the coal direct liquefaction residue (300kg / h) and tetrahydrofuran (300kg / h) in a 50L stirred tank, the stirred tank is protected with nitrogen, and the extraction process is carried out at a pressure of 0.02MPa and a constant temperature of 60°C to obtain an extraction mixture .

[0041] The above-mentioned extraction mixture enters the primary cyclone separator for primary solid-liquid separation, the cyclone temperature is 60°C, and the inlet pressure of the primary cyclone separator is 0.2MPa; after the primary solid-liquid separation, the primary concentrated phase The flow rate is 185kg / h, and the total flow rate of the primary clear liquid is 415kg / h, of which 265kg / h primary clear liquid is sent to the secondary internal cross-flow filter for secondary solid-liquid separation.

[0042] In the secondary solid-liquid separation process, the separation temperature is 60°C, the inlet pressure of the secondary internal cross-flow filter is 0.2MPa, and the pore si...

Embodiment 2

[0048] Mix the coal direct liquefaction residue (250kg / h) and quinoline (500kg / h) in a 120L stirred tank, the stirred tank is protected with nitrogen, and the extraction process is carried out at a pressure of 0.01MPa and a constant temperature of 100°C to obtain the extracted mixture.

[0049] Pass the above-mentioned extraction mixture into a primary centrifugal separator for primary solid-liquid separation, the centrifugal temperature is 100°C, the inlet pressure of the primary centrifugal separator is 0.05MPa, the speed of the centrifuge is 3000r / min, and after the primary solid-liquid separation Finally, the flow rate of the primary concentrated phase is 150kg / h, and the total flow rate of the primary clear liquid is 600kg / h, wherein 400kg / h of the primary clear liquid is sent to the secondary centrifuge for secondary solid-liquid separation.

[0050] During the secondary solid-liquid separation process, the separation temperature is 100°C, the inlet pressure of the secon...

Embodiment 3

[0056] Mix the coal direct liquefaction residue (250kg / h) and coal liquefaction medium oil (120-280°C fraction, 1000kg / h) in a 300L stirred tank. The stirred tank is protected by nitrogen, and the pressure is 0.01MPa, and the temperature is 120°C. Next, the extraction process is carried out to obtain an extraction mixture.

[0057] Pass the above-mentioned extraction mixture into a primary centrifugal separator for primary solid-liquid separation, the centrifugal temperature is 120°C, the inlet pressure of the primary centrifugal separator is 0.06MPa, and the centrifuge speed is 4000r / min. After primary separation, The flow rate of the primary concentrated phase is 170kg / h, the total flow rate of the primary clear liquid is 1080kg / h, and 700kg / h of the primary clear liquid is sent to the secondary cyclone separator for secondary solid-liquid separation.

[0058] During the secondary solid-liquid separation process, the cyclone temperature is 120°C, and the inlet pressure of th...

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Abstract

The invention provides a treatment method for direct coal liquefaction residues. The treatment method comprises the following steps: extracting direct coal liquefaction residues with an extraction solvent to obtain an extraction mixture; performing first-stage solid-liquid separation on the extraction mixture to obtain a first-stage clear liquid and a first-stage concentrated phase; performing second-stage solid-liquid separation on a part of or all the first-stage clear liquid to obtain a second-stage clear liquid and a second-stage concentrated phase; performing third-stage solid-liquid separation on a part of or all the second-stage clear liquid to obtain a third-stage clear liquid and a third-stage concentrated phase; performing second-stage solid-liquid separation on a part of the first-stage clear liquid and performing clear liquid solvent recovery treatment on rest of the first-stage clear liquid to obtain first-stage pitch; performing third-stage solid-liquid separation on a part of the second-stage clear liquid and performing clear liquid solvent recovery treatment on rest of the second-stage clear liquid to obtain second-stage pitch; and performing clear liquid solvent recovery treatment on all the third-stage clear liquid to obtain third-stage pitch. By the treatment method disclosed by the invention, three pitch products can be obtained and the added profit value of pitch in the direct coal liquefaction residues can be improved favorably.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for treating coal direct liquefaction residue. Background technique [0002] The direct coal liquefaction residue is a non-target product of the direct coal liquefaction process, accounting for about 30% of the coal input. It is a substance with high ash, high sulfur and high calorific value, mainly composed of non-distillate liquefied oil (n-hexane soluble matter), bitumen (n-hexane insoluble tetrahydrofuran soluble matter), unconverted coal and inorganic matter. Non-distillate liquefied oil (heavy liquefied oil) and bitumen account for about 50% of the direct coal liquefaction residue, mainly composed of polycyclic condensed aromatic hydrocarbons, which have the characteristics of high aromaticity, high carbon content, and easy polymerization or crosslinking. Different from the characteristics of petroleum pitch and coal tar pitch, the bituminous substances in th...

Claims

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Application Information

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IPC IPC(8): C10C3/08
CPCC10C3/08
Inventor 程时富李克健章序文王国栋常鸿雁舒成张元新
Owner CHNA ENERGY INVESTMENT CORP LTD
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