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Method for directly liquefying coal in CO and H2O system

A direct, coal-based technology, applied in the preparation of liquid hydrocarbon mixtures, petroleum industry, etc., can solve the problem of not paying attention to it, and achieve the effect of improving the utilization value, shortening the process, and reducing the cost of liquefaction

Inactive Publication Date: 2009-10-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Originally intended to use CO and H 2 The idea of ​​liquefying carbonaceous materials with the O system can be traced back to 1921, but due to the popularity of classic liquefaction processes such as direct hydrogenation and F-T synthesis at that time, it was not taken seriously

Method used

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  • Method for directly liquefying coal in CO and H2O system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 2wt% iron sulfide FeS to raw coal 1-x And mix evenly, put into the autoclave, add water and 1wt% alcohol auxiliary agent according to the coal-water (mass ratio) ratio of 1:2, and seal the autoclave after stirring evenly. Nitrogen was purged 3 times and CO was introduced, the initial pressure was 2MPa, the stirring speed was 250rpm, and the reaction temperature was heated to 300°C at a speed of 10°C / min, and the reaction pressure reached 17MPa. After reacting for 30min, it was cooled to room temperature. A liquid product is obtained by extraction and dehydration. The conversion rate is calculated by the gray balance method, and the test result is that the liquefaction conversion rate is 64.6wt% (daf coal, the same below), wherein the oil and gas yield is 39.9wt% (daf coal, the same below), and the asphaltene yield is 24.7wt% (daf coal, the same below). coal, the same below).

Embodiment 2

[0038] Except for the reaction temperature and the use of 1wt% phenolic additives, other process conditions are the same as in Example 1: the reaction temperature is 350°C, the final reaction pressure is 22MPa, the liquefaction conversion rate of lignite is 67.3wt%, and the oil and gas yield is 46.9wt%. , asphaltene yield 20.39wt%.

Embodiment 3

[0040] Except for the reaction temperature, other process conditions are the same as in Example 1, the reaction temperature is 370°C, the final reaction pressure is 26.5MPa, the liquefaction conversion rate of lignite is 68.4wt%, wherein the yield of oil and gas is 52.0wt%, and the yield of asphaltene is 16.4wt %.

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Abstract

The invention discloses a method for directly liquefying coal in CO and H2O atmosphere. The method of directly supplying pure hydrogen is replaced by a method of using water-gas shift reaction for supplying hydrogen, water is used for substituting traditionally liquefied circulating solvent oil and the CO / H2O system is used for directly liquefying the coal with hydrogen. Low-rank coal is used as raw material, transition metal oxide or sulfide is used as catalyst, water is used as solvent and hydroxyl compound is added as assistant, and the low-rank coal is directly liquefied with hydrogen in the subcritical or supercritical state of water and CO atmosphere. The liquefying conversion rate thereof can reach 75.4 wt percent (drying ash-free basis coal) and the oil yield reaches 48 percent. The method for directly liquefying the coal in CO and H2O atmosphere avoids the working procedures of complex hydrogen preparation equipment, low-rank coal drying and dehydration and the like in the traditional coal hydroliquefaction process, thereby simplifying the whole processing equipment. As the hydrogen generated in the CO and H2O system has higher activity, the hydrogenolysis of the low-rank coal is promoted, the yield of liquid products is increased, the liquefaction cost of the coal is reduced and the use value of the low-rank cola can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of coal energy and chemical industry, and in particular relates to a coal liquefaction method. Background technique [0002] In recent years, the research and development of coal liquefaction in my country has progressed rapidly. In the direct coal liquefaction process, hydrogen consumption is an important economic factor for direct coal liquefaction, and hydrogen production is one of the most investment-intensive processes in the liquefaction plant. Therefore, attention has been paid to seeking other sources of hydrogen in the early stages of liquefaction research. The water gas shift reaction (WGSR), the reaction in which readily available carbon monoxide reacts with water to form carbon dioxide and hydrogen, provides this source of hydrogen for coal liquefaction. Because this process does not need to supply pure hydrogen at all, the solvent is cheap and easy to obtain, the solid and liquid are easy to se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/06
Inventor 张德祥徐熠高晋生金山
Owner EAST CHINA UNIV OF SCI & TECH
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