Process for preparing needle coke by utilizing coal tar

A technology for coal tar and needle coke, applied in the field of needle coke preparation, can solve the problems of consuming large aliphatic hydrocarbons and aromatic hydrocarbon solvents, etc., and achieve the effects of good economic benefits, saving solvent consumption, and widening the range of raw materials

Active Publication Date: 2019-03-08
山西中科化美科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method mainly uses coal tar pitch as raw material, and needs to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] After the coal tar is desalted and dehydrated, the coal tar is mixed with the fraction below 210°C from the fractionation unit at a mass mixing ratio of 1:10, heated to 160°C, and left to settle for 8 hours to obtain the upper light phase liquid. The light liquid in the upper layer was subjected to pressure filtration at a pressure of 2 MPa and a temperature of 160° C. to obtain a filtrate. The filtrate is fractionated in the fractionation tower into fractions less than 210°C, fractions at 210-230°C, fractions at 230-300°C and fractions greater than 300°C. The fraction less than 210°C is sent to the mixing and settling unit for the mixing and settling process; the fraction at 210-230°C is sent to the hydrocracking unit to undergo catalytic hydrocracking reaction at a temperature of 250°C and a pressure of 18MPa to obtain a hydrocracking fraction; 230- The 300°C distillate is sent to the 1# compressive compression polymerization device, under the conditions of pressure 5...

Embodiment 2

[0032] After the coal tar is desalted and dehydrated, the coal tar is mixed with the fraction below 210°C from the fractionation unit at a mass mixing ratio of 5:1, heated to 120°C, and left to settle for 10 hours to obtain the upper light phase liquid. The light liquid in the upper layer was pressure-filtered at a pressure of 0.1 MPa and a temperature of 120° C. to obtain a filtrate. The filtrate is fractionated in the fractionation tower into fractions less than 210°C, fractions at 210-230°C, fractions at 230-300°C and fractions greater than 300°C. The fraction below 210°C is sent to the mixing and settling unit for the mixing and settling process; the fraction at 210-230°C is sent to the hydrocracking unit to undergo hydrocracking reaction at a temperature of 450°C and a pressure of 1 MPa to obtain a hydrocracking fraction; 230-300 The ℃ distillate is sent to the 1# compressive compression polymerization unit, under the conditions of pressure 2MPa and temperature 400℃, the ...

Embodiment 3

[0034]After the coal tar is desalted and dehydrated, the coal tar is mixed with the fraction below 210°C from the fractionation unit at a mass mixing ratio of 1:1, heated to 80°C, and left to settle for 16 hours to obtain the upper light phase liquid. The light liquid in the upper layer was pressure-filtered at a pressure of 1.5 MPa and a temperature of 80° C. to obtain a filtrate. The filtrate is fractionated in the fractionation tower into fractions less than 210°C, fractions at 210-230°C, fractions at 230-300°C and fractions greater than 300°C. The fraction less than 210°C is sent to the mixing and settling unit for the mixing and settling process; the fraction at 210-230°C is sent to the hydrogenation unit for hydrocracking reaction at a temperature of 300°C and a pressure of 12MPa to obtain a hydrocracking fraction; 230-300°C The distillate is sent to the 1# pressure compression polymerization unit, under the conditions of pressure 1MPa and temperature 390℃, the 1# polyco...

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Abstract

The invention belongs to the technical field of preparation of needle coke and specifically relates to a process for preparing needle coke by utilizing coal tar. The process comprises the following steps: 1, a mixing and settling unit, mixing the coal tar and the fraction lower than 210 DEG C, and performing heating, standing and settling; 2, a filtering unit, pressurizing and filtering the supernatant liquid so as to obtain filtrate; 3, a fractionation unit, fractionating the filtrate in a fractionating tower to obtain four fractions; 4, a hydrocracking unit, performing hydrocracking on the fraction of 210-230 DEG C to obtain hydrocracked fraction; 5, a 1# pressurized polycondensation unit, reacting the fraction of 230-300 DEG C in a 1# pressurized polycondensation device to obtain 1# polycondensate; 6, a 2# pressurized polycondensation unit, carrying out a reaction of the fraction of higher than 300 DEG C in a 2# pressurized polycondensation device to obtain 2# polycondensate; 7, a coking unit, coking the 1# polycondensate and 2# polycondensate to obtain green needle coke; 8, a calcination unit, performing high-temperature calcination on the green needle coke, thereby obtaining the finished needle coke. Therefore, comprehensive utilization of the coal tar is realized.

Description

technical field [0001] The invention belongs to the technical field of needle coke preparation, in particular to a process for preparing needle coke from coal tar. Background technique [0002] Needle coke is the main material for the production of ultra-high power graphite electrodes. Due to the good graphitization properties of needle coke, the ultra-high power graphite electrodes produced with it have low resistivity, high bulk density, high mechanical strength, and small thermal expansion coefficient. , good thermal shock resistance, etc., and can meet the quality requirements of large-capacity electric arc furnaces, so the production and research of needle coke have gradually received attention. Needle coke is divided into oil-based needle coke and coal-based needle coke according to different raw materials. In the early stage of needle coke production, oil-based needle coke dominated. Later, due to the high oil price and the increasingly light weight of petroleum proc...

Claims

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Application Information

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IPC IPC(8): C10G69/00C10C1/04C10C1/02C10B55/00
CPCC10B55/00C10C1/02C10C1/04C10G69/00
Inventor 郭少青赵亮富王磊冯硕
Owner 山西中科化美科技有限责任公司
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