Asphalt hard carbon material, and preparation method and application thereof

A technology of hard carbon and pitch, which is applied in the field of pitch hard carbon materials and its preparation, and can solve problems such as the inability to prepare hard carbon materials

Active Publication Date: 2016-06-08
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a bituminous hard carbon material, its preparation method and its application, so as to solve the problem that the prior art cannot use bituminous substances in coal liquefaction residues to prepare hard carbon materials

Method used

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preparation example Construction

[0018] As described in the background technology section, in the prior art, it is impossible to use bituminous substances in coal liquefaction residues to prepare hard carbon materials. In order to solve this problem, the inventor of the present invention provides a kind of preparation method of bituminous hard carbon material, and this method comprises the following steps: carry out film distillation with the coal liquefaction bitumen of melting, obtain liquefied heavy oil and bituminous substance; solidifying and pulverizing to obtain asphalt powder; and carbonizing the asphalt powder to obtain asphalt hard carbon material.

[0019] The above-mentioned term "coal liquefaction bitumen" refers to a product containing bituminous substances obtained after solvent extraction and evaporation of coal liquefaction residues, which is a mixture of bituminous substances and liquefied heavy oil. The specific preparation process is as follows: add coal liquefaction residue and extraction...

Embodiment 1

[0032] Add 20kg of coal liquefaction pitch (softening point 120°C) with a particle size of less than 3 mm into a heating tank and heat at 300°C. The heated coal liquefied bitumen was placed in a thin film evaporator, and distilled at 300°C and a negative vacuum pressure of 10Pa for 4 hours to obtain liquefied heavy oil and bituminous substances (softening point: 250°C).

[0033] Crush the bituminous material with a jaw crusher to less than 1mm, place it in an atmosphere furnace, and oxidize it at a constant temperature of 400°C for 2 hours in an air atmosphere, and obtain a solidified bituminous material after cooling down; The jet mill was crushed and sieved to obtain a powder with an average particle size of 15 microns.

[0034] The above powder was carbonized in a high-temperature atmosphere furnace at 1000°C for 6 hours under a nitrogen atmosphere, and after cooling, a pitch hard carbon material with an average particle size of 15 microns was obtained, and its specific sur...

Embodiment 2

[0036]Add 20kg of coal liquefied pitch (softening point 150°C) with a particle size of less than 3 mm into a heating tank and heat at 330°C. The heated coal liquefied bitumen was placed in a thin film evaporator, and distilled at 300°C and a vacuum negative pressure of 20Pa for 6 hours to obtain liquefied heavy oil and bituminous substances (softening point: 245°C).

[0037] Use a jaw crusher to crush the bituminous material to less than 1mm, place it in an atmosphere furnace, and oxidize it at a constant temperature of 500°C for 1 hour in an air atmosphere. After cooling down, you can obtain a solidified bitumen-like material; Carry out pulverization and sieving with a jet mill to obtain a powder with an average particle size of 5 microns.

[0038] The above powder was carbonized in a high-temperature atmosphere furnace at 1500°C for 3 hours under a nitrogen atmosphere, and after cooling, a pitch hard carbon material with an average particle size of 5 microns was obtained, an...

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Abstract

The invention discloses an asphalt hard carbon material, and a preparation method and application thereof. The preparation method comprises the following steps: carrying out thin-film distillation on molten coal liquefied asphalt to obtain liquefied heavy oil and asphalt substances; curing the asphalt substances, and pulverizing to obtain asphalt powder; and carrying out carbonizing treatment on the asphalt powder to obtain the asphalt hard carbon material. In the preparation method, the coal liquefied asphalt is used as the raw material to prepare the asphalt hard carbon material. The coal liquefied asphalt has lower softening point; and after the coal liquefied asphalt is subjected to thin-film distillation, the high-softening-point asphalt substances can be separated from the liquefied heavy oil more thoroughly, thereby obtaining the high-softening-point asphalt substances. The asphalt substances used as the raw material are cured, pulverized, carbonized and the like to prepare the asphalt hard carbon material which has the advantages of small specific area, proper average grain size, low ash content and satisfactory comprehensive properties.

Description

technical field [0001] The invention relates to the technical field of pitch hard carbon materials, in particular to a pitch hard carbon material, its preparation method and its application. Background technique [0002] Due to the smaller graphite-like crystallite size, larger interlayer spacing, and reasonable pore structure, hard carbon materials are more suitable for charging and discharging processes under high currents, so they are expected to be used in electric vehicles. [0003] Coal liquefaction residue is a high-carbon, high-ash and high-sulfur substance. It looks like solid pitch at room temperature. The softening point should be around 190°C and the solid content should be around 50%. The bituminous substance content in the coal liquefaction residue is about 20-30%, and the softening point of this part of the bituminous substance is relatively high, generally above 240°C. However, in the actual application process, the bituminous substances in the coal liquefac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 常鸿雁李克健章序文张元新程时富向柠
Owner CHNA ENERGY INVESTMENT CORP LTD
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