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Mesophase pitch and preparation method thereof

A mesophase asphalt and heat-dissolving technology, which is applied in the preparation of liquid hydrocarbon mixtures, the processing of tar pitch/petroleum pitch/natural pitch, and the melting and processing of tar pitch/petroleum pitch/natural pitch, etc., which can solve the problems of poor quality stability, process Problems such as complex method and high cost achieve the effect of reducing content, simplifying preparation method and promoting transformation

Active Publication Date: 2019-07-23
广东煤基碳材料研究有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome the defects of complex mesophase pitch in the prior art, high cost, low yield, and poor quality stability, thereby providing a kind of mesophase pitch and its preparation method

Method used

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  • Mesophase pitch and preparation method thereof

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preparation example Construction

[0031] The heavy product of the lignite thermolysis catalytic process is the by-product produced in the process of lignite preparation of liquid fuel by thermolysis catalytic method: provided by Zhaoqing Shunxin Coal Chemical Technology Co., Ltd. The specific preparation method includes the following steps: 30~50wt % lignite powder, 50-70wt% 1-methylnaphthalene and 0.01-5wt% halide catalyst are fully stirred and mixed to form a coal slurry, and the hot-melt catalytic reaction of the coal slurry generates a hot-solubilized product, wherein the hydrogenation of the hot-melt catalytic reaction process is controlled The temperature is 400-500°C, the pressure is 6-13MPa, the hydrogen-oil volume ratio is 400-600, and the space velocity is 0.2-1.2h -1 , the reaction time is 30 to 60 minutes, and the thermally liquefied product is separated into light hot melt and lignite thermally dissolved catalytic heavy component, wherein the separation method includes normal pressure separation or...

Embodiment 1

[0037] Fully stir and mix 45wt% lignite powder, 58.3wt% 1-methylnaphthalene and 1wt% zinc iodide catalyst to form a coal slurry. The coal slurry is hot-dissolved and catalyzed to generate a hot solution product. The hydrogenation temperature is 500°C and the pressure is 10MPa , The volume ratio of hydrogen to oil is 450, and the space velocity is 0.5h -1 , separating the obtained thermal solution product through vacuum distillation to obtain lignite thermally dissolved catalytic heavy components with a boiling point between 350°C and 370°C;

[0038] Take 0.5 tons of the heavy product of the lignite hot-melt catalytic process with a boiling point between 350 and 370°C and preheat it to 120°C, and then use a high-temperature metering pump to input it into an electromagnetically heated circulating thermal polycondensation reactor. Thermal polycondensation reaction is carried out at 1MPa, react for 30min, and then enter the internal and external heating distillation tower, control...

Embodiment 2

[0041] 50wt% lignite powder, 55wt% 1-methylnaphthalene and 5wt% zinc iodide catalyst are fully stirred and mixed to form a coal slurry, and the coal slurry is thermally dissolved and catalyzed to generate a thermally soluble product. The hydrogenation temperature is 450°C and the pressure is 13MPa. The volume ratio of hydrogen to oil is 600, and the space velocity is 0.2h -1 , separating the obtained thermally liquefied product through vacuum distillation to obtain lignite thermally soluble catalytic heavy components with a boiling point between 350 and 410°C;

[0042] Take 0.5 tons of the heavy product of the lignite hot-melt catalytic process with a boiling point between 350 and 410°C and preheat it to 140°C, and then use a high-temperature metering pump to input it into an electromagnetically heated circulating thermal polycondensation reactor. Thermal polycondensation reaction is carried out at 2MPa, react for 20min, and then enter the internal and external heating distill...

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Abstract

The invention provides an application of a heavy product with a boiling point at 350-410 DEG C prepared through a lignite thermal melting catalysis technology as a raw material in preparing a mesophase pitch and a preparation method of the mesophase pitch. The preparation method comprises the following steps: taking the heavy product with the boiling point at 350-410 DEG C prepared through the lignite thermal melting catalysis technology as the raw material, and then performing thermal polycondensation, reduced pressure distillation, hydrogenation reaction, flashing and heat sensitization, thereby acquiring the mesophase pitch. The content of raw quinoline insolubles in the mesophase pitch product can be extremely reduced; the conversion of hydrogenated pitch into the mesophase pitch can be boosted; the loss of high-value components in the reaction process can be obviously reduced; the yield and quality stability of high-quality mesophase pitch product can be promoted; light componentsare removed by flashing, so that all hydrogen-donor solvent can be recycled; continuous production can be realized; lastly, the high-quality mesophase pitch product with mesophase pitch content not less than 61.2%, softening point at 274-282 DEG C and yield not less than 99.3% can be prepared.

Description

technical field [0001] The invention relates to the technical field of carbon material preparation, in particular to a mesophase pitch and a preparation method thereof. Background technique [0002] Mesophase pitch is the precursor for preparing high-end carbon materials. Carbon fiber, mesophase carbon microspheres, pitch-based foam carbon, mesophase pitch, lithium battery negative electrode material, binder for refractory materials, etc. can be prepared through mesophase pitch. Mesophase pitch Widely used in national defense, aerospace, civil and other aspects. Coal-based mesophase pitch has complex components of raw materials (coal tar pitch or heavy oil) and is a mixture of a large number of condensed aromatic hydrocarbons. It is difficult to control the formation, growth and fusion of mesophase pellets, and the product quality stability is poor. The asphalt chemical reaction process and separation process require high equipment, and stable and continuous production is v...

Claims

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Application Information

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IPC IPC(8): C10C3/00C10C3/02C10C3/06C10C3/10C10G1/00
CPCC10C3/002C10C3/023C10C3/06C10C3/10C10G1/002C10G1/008
Inventor 吴克徐熠李守富陈翀包富明
Owner 广东煤基碳材料研究有限公司
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