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Continuous preparation method of oil-based raw material for mesophase pitch production

A mesophase asphalt and raw material technology, applied in the processing of tar pitch/petroleum pitch/natural pitch by chemical method, processing of tar pitch/petroleum pitch/natural pitch by selective extraction, processing of tar pitch/petroleum pitch/natural pitch, etc. , can solve problems such as difficulty in obtaining refined feedstock oil, complex composition of aromatic-rich distillate oil, and high impurity content

Active Publication Date: 2021-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the characteristics of complex composition and high impurity content of aromatic-rich distillate oil obtained by traditional treatment technology, it is difficult to obtain refined raw material oil that meets the requirements by using a single raw material pretreatment process. Therefore, according to different treatment process characteristics and mesophase pitch product performance requirements , the development of a highly universal and flexible feed oil combined pretreatment process has important economic and social benefits

Method used

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  • Continuous preparation method of oil-based raw material for mesophase pitch production

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Experimental program
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Effect test

Embodiment 1

[0029] Under the condition of absolute pressure of 5KPa, 3000g of catalytic oil slurry was subjected to vacuum precision fractionation to obtain aromatic-rich distillate oil above 300°C. Take 350g of rich-aromatic distillate oil and place it in an ultrasonic generator and adjust the power to 600W. Conditions for 60min. Then, the treated distillate oil was hot filtered at 130°C using a 20nm filter medium, followed by ion exchange at 100°C, using n-heptane, toluene, and toluene-ethanol mixed solvent (1:1) as solvents in sequence. Phase, adjust the colloid and asphaltene content of the mixed components. The filtered distillate was subjected to solvent extraction, and in a 500mL three-neck flask, furfural was used as the solvent, and the ratio of component to solvent was 1:4, and refluxed for 2h. Obtain refined raw material, get 200g refined raw material oil and place in autoclave, and add 1.5gAlCl 3 The particles are used as a catalyst, and reacted at 300°C and 0.1MPa for 30 mi...

Embodiment 2

[0032]Under the condition of absolute pressure of 5KPa, 3000g of catalytic oil slurry was subjected to vacuum precision fractionation to obtain aromatic-rich distillate oil above 300°C. Take 350g of rich-aromatic distillate oil and place it in an ultrasonic generator and adjust the power to 800W. Conditions for 70min. Then, the treated distillate oil was hot filtered at 130°C using a 50nm filter medium, followed by ion exchange at 110°C, using n-heptane, toluene, toluene-ethanol mixed solvent (1:1) solvent as the flow Phase, adjust the colloid and asphaltene content of the mixed components. The distillate oil after hot filtration is subjected to solvent extraction, in a 500mL three-necked flask, N-methylpyrrolidone is used as a solvent, the ratio of component to solvent is 1:4, and the refined raw material is obtained by reflux for 2.5h, and 200g of the refined raw material oil is taken Place in a high pressure reactor and add 2g of AlCl 3 The particles are used as a catalys...

Embodiment 3

[0035] Under the condition of absolute pressure of 5KPa, 3000g of catalytic oil slurry was subjected to vacuum precision fractionation to obtain aromatic-rich distillate oil above 300°C. Take 350g of rich-aromatic distillate oil and place it in an ultrasonic generator and adjust the power to 700W. Conditions for 90min. Then, the treated distillate oil was hot filtered at 140°C using a 30nm filter medium, followed by ion exchange at 130°C, using n-heptane, toluene, toluene-ethanol mixed solvent (1:1) solvent as the flow Phase, adjust the colloid and asphaltene content of the mixed components. The hot filtered distillate oil is subjected to solvent extraction, and in a 500mL three-necked flask, a mixture of N-methylpyrrolidone and N,N-dimethylformamide (mixing ratio 2:1) is used as the solvent, and the ratio of component to solvent = 1:4, reflux for 3 hours to obtain refined raw materials, take 200g of refined raw material oil and place it in a high-pressure reactor, and add 3g...

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Abstract

The invention discloses a continuous preparation method of an oil-based raw material for mesophase pitch production. The method comprises the following steps: carrying out ultrasonic cavitation treatment on one or more heavy fraction sections of aromatic hydrocarbon-rich heavy oil, catalytic slurry oil, coal tar or ethylene tar, which are greater than 300 DEG C, as raw materials, regulating and controlling the composition and distribution of four components of the raw materials, and enabling the sum of the aromatic carbon rate (CA) and the naphthenic carbon rate (CN) to be 55-80%, and the absolute change rate of the naphthenic ring number and the aromatic ring number of the raw oil to be less than 3.5%; (2) carrying out hot filtration combined ion exchange treatment to remove solid impurities in the raw oil and realize group composition distribution regulation and control, and further regulating and controlling molecular weight distribution to be within 300-650; (3) solvent extraction: further optimizing the group composition distribution of the raw oil through solvent extraction, wherein the aromatic carbon rate CA is controlled between 60% and 85%; and (4) carrying out catalytic polycondensation reaction to obtain the mesophase pitch with the softening point of 270-300 DEG C, the mesophase content of more than 97% and good spinning performance.

Description

technical field [0001] The invention relates to a continuous preparation method for oil-based raw materials used in the production of mesophase pitch, and belongs to the research fields of petroleum deep processing technology and carbonaceous mesophase materials. Background technique [0002] The amount of catalytic oil slurry by-product of catalytic cracking unit is increasing. At present, it is mainly used as asphalt blending component or mixed with fuel oil. The utilization rate is extremely low, and the value of precious oil resources has not been fully utilized; heavy oil, coal Tar and ethylene tar also face the problem of low utilization due to their complex structure and composition. [0003] Mesophase pitch is an effective way to realize high value-added utilization of inferior oil products. However, it is required that the raw materials used for the production of mesophase pitch have uniform structural composition distribution, suitable molecular weight range, etc....

Claims

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Application Information

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IPC IPC(8): C10C3/00C10C3/08C10C3/02
CPCC10C3/00C10C3/08C10C3/02Y02P20/54
Inventor 刘东柴鲁宁沈国波杜辉段雅静付玉娥张建国袁辉志
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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