Method for directly liquefying coals with function of maximizing utilization of liquefied residues

A direct technology of liquefaction residue, which is applied in the field of direct coal liquefaction including the maximum utilization of liquefaction residue, can solve the problems of easy blockage of pipelines and high viscosity, and achieve the effects of improving oil quality, improving yield and increasing operation flexibility.

Active Publication Date: 2011-04-13
CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the bituminous substance has not undergone hydrogenation reaction, the viscosity is very high, so the pipeline of the liquefaction unit is easily blocked

Method used

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  • Method for directly liquefying coals with function of maximizing utilization of liquefied residues
  • Method for directly liquefying coals with function of maximizing utilization of liquefied residues
  • Method for directly liquefying coals with function of maximizing utilization of liquefied residues

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Experimental program
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Effect test

Embodiment 1

[0040] Inner Mongolia Shengli lignite (45.7% dry ash-free volatile matter (Vdaf), 13.2% dry basis ash content (Ad), 71.66% C, 4.75H, 21.42% O) was pulverized to obtain 180 mesh coal powder, and dried to The water content is 2% (mass fraction). The catalyst is a γ-hydration iron oxide (γ-FeOOH) type high-activity liquefaction catalyst with a diameter of 20-50 nanometers and a length of 80-180 nanometers. The co-catalyst is sulfur, S / Fe (molar ratio)=2, Fe / dry coal is 1.0% (mass fraction), the solid concentration of coal slurry is 50% (mass fraction), and the feed rate of coal slurry in the liquefaction device is 8kg / h.

[0041] Residue extraction unit, the extraction solvent is N-methylpyrrolidone, the mass ratio of residue to solvent is 1:1.5, the extraction temperature is 130°C, the solid-liquid separation method is hot pressure filtration, the solvent recovery is vacuum distillation method, heavy oil and The hydrogenation temperature of bituminous substances is 420°C.

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Embodiment 2

[0044] Xinjiang bituminous coal (40.2% Vdaf, 3.4% Ad, 81.9% C, 5.3% H, 11.2% O) was pulverized to obtain 190-mesh coal powder and dried to a moisture content of 1% (mass fraction). The catalyst is molybdenum oxide, and the addition amount is 1.5% of the dry coal powder mass; the cocatalyst is carbon disulfide, and the addition amount is 2.5% of the dry coal powder mass; The amount of feed is 9kg / h.

[0045] Residue extraction unit, the extraction solvent is N,N-dimethylacetamide, the mass ratio of residue to solvent is 1:3.5, the extraction temperature is 120°C, the solid-liquid separation is hot pressure filtration, the solvent recovery is vacuum distillation, heavy The hydrogenation temperature of oil and asphalt is 430°C.

[0046] See Table 1 for other process conditions, and Table 2 for the experimental results.

Embodiment 3

[0048] Gansu lignite (45.8Vdaf, 18.8%Ad, ​​70.7%C, 4.6%H, 18.8%O) was pulverized to obtain 200-mesh coal powder and dried to a moisture content of 2.5% (mass fraction). The catalyst is iron oxide, and the addition amount is 3% of the dry coal powder mass; the co-catalyst is dimethyl disulfide, and the addition amount is S / Fe (molar ratio)=2. The solid concentration of the coal slurry is 45% (mass fraction), and the feed rate of the coal slurry in the liquefaction device is 10kg / h.

[0049] In the residue extraction unit, the extraction solvent is tetrahydrofuran, the mass ratio of residue to solvent is 1:3, the extraction temperature is 50°C, the solid-liquid separation is hot pressure filtration, the solvent recovery is atmospheric distillation, and heavy oil and asphalt are hydrogenated The temperature was 440°C.

[0050] See Table 1 for other process conditions, and Table 2 for the experimental results.

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Abstract

The invention relates to a method for directly liquefying coals with a function of maximizing utilization of liquefied residues. The method comprises the following technical steps: preparing coal paste; carrying out hydrotreating and liquefaction on the coal paste; carrying out oil separation treatment on the obtained oil product; carrying out upgrading and hydrotreating on the obtained product; carrying out hot extraction on the residues and then carrying out solid-liquid separation on the residues; and recovering the solvent; and carrying out hydrotreating treatment on the mixture of heavy oils and asphalt materials so as to obtain the final product, then taking the heavy oils as recycled solvent to prepare the coal paste, and the like. The method provided by the invention has the advantages that because of organically combining the liquefaction process and the residue extraction, the utilization of liquefied residues is maximized, the conversion rate of coal is improved, the yieldsof light and middle oils subjected to coal liquefaction are improved by 10 to 60 percent, and the quality of oil is improved, thereby greatly enhancing the economic benefits of direct coal liquefaction plants and improving environment protection; and the method provided by the invention has important economic and social significances, and can widely be applied to the field of coal direct liquefaction.

Description

technical field [0001] The invention belongs to the field of coal chemical processing, in particular to a coal direct liquefaction method including maximum utilization of liquefaction residue. Background technique [0002] Due to the decline of oil reserves year by year and the continuous increase of exploitation, the price of oil continues to rise at a high level, so the world-wide oil shortage crisis will be inevitable. my country is rich in coal and poor in oil, and the energy security situation is even more serious. Coal direct liquefaction (hereinafter referred to as coal liquefaction) is an advanced clean coal that converts coal into liquid fuel or chemical raw material by making hydrogen enter the molecular structure of coal and its derivatives under high temperature and high pressure with the help of hydrogen-donating solvents and catalysts. technology. The development of coal liquefaction technology is one of the important ways to alleviate the shortage of petrole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00C10G1/08C10G67/00
Inventor 胡发亭朱晓苏李文博张晓静毛学锋史士东石智杰何平王雨李培霖赵鹏谷小会王勇杜淑凤张帆朱肖曼吴艳
Owner CHINA COAL RES INST
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