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Method for removing quinoline insoluble substances in coal tar pitch and system used in method

A technology of coal tar pitch and quinoline, applied in the processing of tar pitch/petroleum pitch/natural pitch, processing tar pitch/petroleum pitch/natural pitch by distillation, processing tar pitch/petroleum pitch/natural pitch by selective extraction, etc. , can solve the problems of low yield of refined asphalt, low yield of refined asphalt, long settling time, etc., and achieve the effect of increasing yield and mixed solvent recovery, reducing volatilization of light components, and increasing economic benefits

Active Publication Date: 2019-12-31
CHINA UNIV OF MINING & TECH (BEIJING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are some defects in the above methods: 1. The yield of refined asphalt by distillation method is low; 2. The filtration method has strict requirements on the filter screen, and the process conditions are very harsh
3. Hydrogenation method, complex process, large investment, not suitable for large-scale production
4. Supercritical extraction method, supercritical process conditions are not easy to control
5. Solvent separation and sedimentation method, this method has excellent removal effect, but the yield of refined asphalt is not high, the settling time is long (generally 5-24h), and the solvent loss rate is high

Method used

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  • Method for removing quinoline insoluble substances in coal tar pitch and system used in method
  • Method for removing quinoline insoluble substances in coal tar pitch and system used in method
  • Method for removing quinoline insoluble substances in coal tar pitch and system used in method

Examples

Experimental program
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Effect test

Embodiment 1A

[0049] A system used in a method for removing quinoline insolubles in coal tar pitch, characterized in that:

[0050] The system includes: a pressurized extraction and sedimentation device 1, a distillation tower 4;

[0051] There is a stirring device 102 inside the pressurized extraction and sedimentation device 1, a coal tar pitch inlet 101 is provided at the right end of the top of the pressurized extraction and sedimentation device 1, and a compressed gas inlet 103 and a pressure gauge 104 are provided at the left end of the top of the pressurized extraction and sedimentation device 1;

[0052] There is a tar residue outlet 107 at the left end of the lower part of the pressurized extraction and sedimentation device 1, and a heating medium outlet 106 is arranged at the middle part of the left end, and there is a mixed solvent inlet 105 at the left end of the upper part of the pressurized extraction and sedimentation device 1, and there is a gap between the mixed solvent inlet ...

Embodiment 1B

[0057] Washing oil is used as the aromatic hydrocarbon solvent, kerosene is used as the aliphatic hydrocarbon solvent, and the mixed solvent is prepared by mixing at a weight ratio of 0.25:1;

[0058] Then mix the medium-temperature coal tar pitch and the mixed solvent in a weight ratio of 1:3, place it in the pressurized extraction and sedimentation device 1, fill it with air or nitrogen at a certain pressure, and increase the pressure of the system by heating the solvent to 110 °C, control the pressure inside the tank of the pressurized extraction and settling device 1 to 0.5Mpa, and control the temperature for 1 hour of extraction, then settling at constant temperature and pressure for 2 hours.

[0059] After standing and settling, the solvent in the upper layer is distilled under reduced pressure, and the mixed solvent is recycled. The recovery rate can reach more than 90%. After removing the quinoline insoluble matter, the content of the quinoline insoluble matter in aspha...

Embodiment 2

[0062] The mixed solvent is prepared by mixing aromatic hydrocarbon solvent as washing oil and aliphatic hydrocarbon solvent as kerosene at a weight ratio of 0.3:1. Mix medium-temperature coal tar pitch and mixed solvent in a weight ratio of 1:2, place in a pressurized extraction tank, fill with air or nitrogen at a certain pressure, control the pressure in the tank to 0.7Mpa, raise the temperature to 100°C, and control the temperature After 1 hour of extraction under low pressure, it was allowed to settle at constant temperature and pressure for 2 hours.

[0063] After standing and settling, the solvent in the upper layer is distilled under reduced pressure, and the mixed solvent is recycled, and the recovery rate can reach more than 90%, but after removing the quinoline insolubles, the quinoline insoluble content of asphalt is 0.1%, and the yield is 82%.

[0064] According to the process of this example, due to the increased use of pressurized equipment to treat asphalt and ...

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Abstract

The invention belongs to the field of coal tar pitch refining, and particularly relates to a method for removing quinoline insoluble substances in coal tar pitch and a system used in the method. The method comprises the following steps: (1) mixing an aromatic hydrocarbon solvent and an aliphatic hydrocarbon solvent to obtain a mixed solvent; (2) mixing the coal tar pitch and the mixed solvent in an extraction settling device; (3) introducing air or nitrogen into the extraction settling device, heating and pressurizing the solvent, adjusting the steam pressure of the hot solvent, extracting thepitch, and polymerizing the quinoline insoluble substances in the pitch to form large particles for settling separation; and (4) leading out the solvent for dissolving the pitch in the step (3), enabling the solvent to enter a reduced-pressure distillation device, and recovering the solvent through reduced-pressure distillation to obtain the asphalt without the quinoline insoluble substances. Byadopting the process and the system provided by the invention, the separation efficiency of the quinoline insoluble substances is high, the recovery rate of the solvent is high, the components are uniformly distributed, and the pitch without the quinoline insoluble substances can be used as an excellent raw material for preparing carbon materials such as high-quality mesophase pitch and needle coke.

Description

technical field [0001] The invention relates to the field of refining coal tar pitch, in particular to a method for removing quinoline insolubles in coal tar pitch, and also to a system used in the method. Background technique [0002] Coal tar pitch contains a certain amount of quinoline insolubles (QI), which are mainly amorphous carbon generated by thermal polymerization of certain polymer resinous substances during coal tar distillation and coal powder and coke brought along with gas from the coking chamber. pink. During the formation of the mesophase, QI will adhere to the surrounding of the mesophase. Due to the large molecular weight and high heteroatom content of QI, the reaction speed is fast, and it is easy to be embedded on the surface of the small spheres, which hinders the growth and fusion of the mesophase spheres. , cannot develop into a watershed structure with good fiber structure. Therefore, the raw materials need to be refined to remove solid particles s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/00C10C3/08C10C3/06
CPCC10C3/00C10C3/06C10C3/08
Inventor 林雄超任英浩王永刚杨小伟许德平庞伟伟张海永赵士夺
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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