High temperature solvent pretreatment method for improving yield of sodium rich coal direct liquefaction oil

A technology for directly liquefying coal and high-temperature solvents, which is applied in the treatment of hydrocarbon oil, the preparation of liquid hydrocarbon mixtures, and the petroleum industry. Application and other issues to achieve the effect of overcoming adverse effects, optimizing hydrogen distribution, and promoting transformation

Inactive Publication Date: 2017-05-24
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the impact of exchangeable sodium ions on the direct liquefaction of low-rank coal is unfavorable. This adverse effect is mainly reflected in two aspects: exchangeable sodium ions can increase the generation of coal pyrolysis free radicals in direct liquefaction, increase Yield of by-product liquefaction residues; under higher direct liquefaction reaction temperature conditions, exchangeable sodium ions are easy to react with clay minerals in coal, and the slag-like substances generated have strong cohesiveness and are easy to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]The raw coal is crushed, the crushed particle size is less than 150μm, and the crushed crushed coal and mixed solvent (tetralin, naphthalene, 0.10mol / L ferrous sulfate solution) are put into the tube bomb reaction at a mass ratio of 1:1 In the device, ultrasonic shock treatment was performed for 15 minutes. Then, the temperature of the reactor was raised to 220° C. at a heating rate of 80° C. / min, and the pretreatment residence time was 30 minutes. The treated mixed slurry was separated by centrifugal precipitation, and the recovered solvent was continued to be used in subsequent liquefaction experiments. The separated treated coal was vacuum-dried at 40°C for 6 hours and then sealed and stored. The direct liquefaction experiment was carried out under the conditions of 420°C and 3MPa hydrogen pressure. Compared with the crushed coal, the yield of liquefied oil increased by 10.5% and the conversion rate increased by 15.6% after solvothermal treatment.

Embodiment 2

[0031] The raw coal is crushed, the crushed particle size is less than 150μm, and the coal and the mixed solvent (dihydrophenanthrene, naphthalene, 0.12mol / L ferrous sulfate solution) are put into the high-pressure reactor with a mass ratio of 2:1, and ultrasonic vibration treatment 15min. Then, the reactor was heated to 230° C. at a heating rate of 100° C. / min, and the residence time was 30 minutes. The treated mixed slurry was separated by centrifugal precipitation, and the solvent was recovered and continued to be used in subsequent liquefaction experiments. The separated treated coal was vacuum-dried at 50°C for 8 hours and then sealed and stored. The direct liquefaction experiment of coal was carried out under the conditions of 440°C and 3MPa hydrogen pressure. Compared with the crushed coal, the yield of liquefied oil increased by 12.6% and the conversion rate increased by 16.3% after solvothermal treatment.

Embodiment 3

[0033] The raw coal is crushed, the crushed particle size is less than 100μm, and the crushed coal and the mixed solvent (dihydrophenanthrene, 1-methylnaphthalene, 0.15mol / L ferrous sulfate solution) are put into the high-pressure reactor at a mass ratio of 1.5:1 Within 20 minutes, ultrasonic shock treatment. Then, the reactor was heated to 230°C at a heating rate of 100°C / min, and the pretreatment residence time was 40min. The treated mixed slurry was separated by centrifugal precipitation, and the recovered solvent was continued to be used in subsequent liquefaction experiments. The separated treated coal was vacuum-dried at 50°C for 6 hours and then sealed and stored. The direct liquefaction experiment of coal was carried out under the conditions of 440°C and 2MPa hydrogen pressure. Compared with the crushed coal, the yield of liquefied oil increased by 11.3% and the conversion rate increased by 15.5% after solvothermal treatment.

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Abstract

The invention discloses a high temperature solvent pretreatment method for improving the yield of sodium rich coal direct liquefaction oil. The method includes: firstly conducting crushing treatment on raw coal, blending the crushed coal with a compound solvent in a mass ratio of 2:1-1:1 in a reactor, then performing ultrasonic oscillation treatment, then subjecting the obtained mixed slurry to heat treatment under a condition of 200-250DEG C for 20-40min, employing flow sand bath for fast heating of the reactor, then separating the heat treated mixed slurry by centrifugal precipitation, and recovering the solvent for subsequent liquefaction experiment. The pretreatment method provided by the invention has the advantages of simple operation, recyclable solvent, and obvious promotion effect on the direct liquefaction oil yield. According to the invention, after high temperature solvent pretreatment, the oil yield of high sodium coal direct liquefaction can be increased by 10%-13% (dry ash-free basis), the overall conversion rate can be increased by 15%-18% (dry ash-free basis), therefore the method has good industrial value and application prospect.

Description

technical field [0001] The invention relates to a high-temperature solvent pretreatment method, in particular to a high-temperature solvent pretreatment method suitable for increasing the yield of sodium-rich coal directly liquefied oil. Background technique [0002] my country's national conditions of rich coal, poor oil, and little gas determine the important role of coal in my country's energy system. Among various types of coal, the proven reserves of low-rank coal represented by lignite and sub-bituminous coal are Highest. According to statistics from authoritative departments, low-rank coal reserves account for about 55% of China's proven coal resource reserves (about 1.02 trillion tons), and the volatile content in them is equivalent to about 100 billion tons of oil and gas resources. It is foreseeable that for a long period of time in the future, the efficient and clean utilization of low-rank coal will play an important role in ensuring my country's energy security ...

Claims

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Application Information

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IPC IPC(8): C10G1/00
CPCC10G1/00C10G2300/70C10G2300/80
Inventor 李晓孟献梁褚睿智吴国光
Owner CHINA UNIV OF MINING & TECH
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