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Continuous process for preparing mesophase pitch from refined raw oil

A technology of mesophase pitch and raw oil, which is applied in the processing of tar pitch/petroleum pitch/natural pitch, the petroleum industry, and distillation processing of tar pitch/petroleum pitch/natural pitch, etc.

Active Publication Date: 2021-05-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, petroleum asphalt, coal tar pitch and other raw materials rich in aromatic components often have a wide range of molecular weight distribution, high content of asphaltenes and heteroatoms, and the raw materials need to be refined before the reaction, but the existing traditional single treatment process is difficult to meet the requirements Therefore, the development of a high-efficiency refining and pretreatment combined process method with high universality and flexible combination and modulation according to the properties of raw materials has important economic and social benefits

Method used

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  • Continuous process for preparing mesophase pitch from refined raw oil
  • Continuous process for preparing mesophase pitch from refined raw oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put ethylene tar into the normal pressure heating furnace, heat it to 200°C and input it into the decompression precision fractionation unit, the absolute pressure is 5kPa, the decompression precision deep drawing separates the distillate above 300°C, opens the corresponding valve, and introduces the distillate into the ultrasonic chamber Chemical-filtration-solvent extraction integrated unit, select ceramic membrane with a pore size of 20nm as the filter membrane, add the extraction agent N,N-dimethylformamide, the solvent-oil ratio is 2, and the flow rate is 1m 3 / h, at a temperature of 60°C and an ultrasonic power of 600W for 60 minutes, the obtained raw material oil was subjected to static sedimentation and solvent oil separation to obtain the aromatic carbon rate (C A ) and naphthenic carbon ratio (C N ) between 35% and 65%, the absolute change rate of aroma and colloid group composition is >2.0%, and the ash content is ≤20μg / g;

[0033] The aromatic-rich distilla...

Embodiment 2

[0037] Put the coal tar into the normal-pressure heating furnace, heat it to 150°C, and input it into the vacuum precision fractionation unit. The absolute pressure is 7kPa, and the vacuum precision deep drawing separates the distillate above 300°C. Open the corresponding valve and introduce the distillate into the ultrasonic chamber. Chemical-filtration-solvent extraction integrated unit, select ceramic membrane with a pore size of 100nm as the filter membrane, add extraction agent N-methylpyrrolidone, the ratio of agent to oil is 4, and the flow rate is 0.8m 3 / h, at a temperature of 80°C and an ultrasonic power of 700W for 50 minutes, the obtained raw material oil was subjected to static sedimentation and solvent oil separation, and the aromatic carbon rate (C A ) and naphthenic carbon ratio (C N ) between 35% and 65%, the absolute change rate of aroma and colloid group composition is >2.0%, and the ash content is ≤20μg / g;

[0038] The aromatic-rich distillate oil is intro...

Embodiment 3

[0042] Take 2.0kg of catalytic oil slurry and add it to the vacuum precision fractionation unit. The temperature of entering the tower is 150°C and the absolute pressure is 5KPa. The fraction oil above 300°C is separated by vacuum precision deep drawing, and the corresponding valve is opened to introduce the fraction oil and the extractant at the same time. Ultrasonic cavitation-filtration-solvent extraction integrated unit, using a ceramic membrane with a pore size of 150nm, the extraction agent is N,N-dimethylformamide, the solvent-oil ratio is 2, the power of the ultrasonic generator is adjusted to 600W, at 80°C Under the conditions of extraction and filtration, after the extraction is completed, the filtrate is subjected to static sedimentation and solvent oil separation, and the treated raw material oil is introduced into the liquid-solid adsorption chromatographic separation unit. As the mobile phase, the activated silica gel is used as the stationary phase to perform liq...

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Abstract

The invention provides a continuous process for preparing mesophase pitch from refined raw oil, which comprises the following steps: by taking one or more of aromatic hydrocarbon-rich heavy oil, catalytic slurry oil, coal tar or ethylene tar as a raw material, decompressing to obtain a heavy fraction section of which the temperature is greater than 300 DEG C, and sequentially passing through an ultrasonic-assisted filtration de-ashing coupling enhanced extraction unit, a sedimentation unit and a solvent-oil separation unit, integrating a liquid-solid adsorption separation unit to obtain refined raw oil which is single in structural composition, narrow in molecular weight distribution and low in content of heteroatoms and solid impurities, and introducing the refined raw oil into a co-carbonization unit to be subjected to co-carbonization reaction with naphthenic base vacuum three-line and four-line distillate oil to obtain the mesophase pitch with the softening point being 220-310 DEG C, the mesophase content being larger than 92% and good spinnability. According to the method, high value-added utilization of the heavy distillate oil is realized through a highly integrated process, the operable space is large, the universality is high, and an important foundation is laid for preparing a high-performance petroleum-based carbon material.

Description

technical field [0001] The invention relates to a continuous process for preparing mesophase pitch from refined raw material oil, and belongs to the research fields of petroleum deep processing technology and carbonaceous mesophase materials. Background technique [0002] Generally, pitch-based carbon fibers are divided into general-purpose carbon fibers and high-performance carbon fibers according to performance. The former is mainly used in the field of thermal insulation materials due to its low strength and modulus, while the latter has high modulus, high strength, high thermal conductivity, and Excellent properties such as high temperature and corrosion resistance are indispensable engineering materials for aerospace. Mesophase pitch-based carbon fiber is a special fiber prepared from mesophase pitch with high mesophase content and low softening point through melt spinning, pre-oxidation, carbonization, and graphitization. However, the mechanical properties of the fiber...

Claims

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Application Information

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IPC IPC(8): C10C3/00C10C3/08C10C3/02C10C3/06
CPCC10C3/00C10C3/08C10C3/026C10C3/06
Inventor 刘东娄斌于庆生师楠温福山殷长龙杨修洁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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