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Intermediate-phase asphalt and method for preparing intermediate-phase asphalt from coal liquefaction refined asphalt

A mesophase asphalt and refined asphalt technology, which is applied in the field of deep coal processing, can solve the problems of keeping the liquid phase short, destroying the structural integrity of the electrode, reducing the strength and density of the electrode, etc., to extend the carbonization temperature range and improve the flow of the system Sex, the effect of inhibiting excessive carbonization

Active Publication Date: 2014-07-16
CHNA ENERGY INVESTMENT CORP LTD +2
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Problems solved by technology

[0003] Patent CN101580729A discloses a method for preparing mesophase pitch by using coal liquefaction and refined asphalt in coal liquefaction residue. For example, refined asphalt from coal liquefaction is a highly reactive raw material, which reacts violently in the carbonization stage, the viscosity of the system will rise rapidly, the reaction temperature range is narrow, the time to maintain the liquid phase is short, and the fluidity of the system is relatively low. Poor, which affects the fusion of mesophase pitch, so the plasticity of the final mesophase pitch prepared is not good
[0004] At present, another problem exists in the use of coal liquefaction refined pitch, that is, the mesophase pitch prepared from coal liquefaction refined pitch is the main raw material for preparing carbon materials such as needle coke, but due to the high nitrogen content in coal liquefaction refined pitch, this The nitrogen is mainly bonded to carbon through covalent bonds. During the graphitization process, it will break and release nitrogen-containing gas rapidly, which will cause the crystal expansion of needle coke, thereby causing cracks or voids in the electrode, reducing the electrode quality. strength and density, destroying the integrity of the electrode structure

Method used

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  • Intermediate-phase asphalt and method for preparing intermediate-phase asphalt from coal liquefaction refined asphalt
  • Intermediate-phase asphalt and method for preparing intermediate-phase asphalt from coal liquefaction refined asphalt

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Embodiment approach

[0040] According to a typical embodiment of the present invention, the melting point or softening point of the polymer is ≤150°C. The present invention preferably adopts a high molecular polymer with a softening point or a melting point≤150°C, but is not limited thereto. The use of a high molecular polymer with a melting point or a softening point≤150°C is mainly due to its low melting point or softening point, which can Fully mixed with coal liquefied asphalt, it can fully react with asphalt after chain scission at high temperature to generate free radicals, and obtain mesophase asphalt with better optical properties.

[0041] According to a typical embodiment of the present invention, the molecular weight of the high molecular polymer is less than 50,000. The present invention preferably adopts high molecular polymers with the above molecular weights, but is not limited thereto. High molecular polymers with the above molecular weights have the advantages of low softening or ...

Embodiment 1

[0049] 180g coal liquefaction refined pitch (provided by Shanghai Research Institute of China Shenhua Coal-to-oil Chemical Co., Ltd.) and 40g polystyrene (provided by Jiangsu Leiden Baofu Plastic Chemical Co., Ltd.) are fully mixed, and then the mixture is placed in a 500ml high-pressure In the kettle, after sealing, purging with nitrogen gas, so that the nitrogen pressure reaches 3.0MPa, the temperature of the mixture is raised to 200°C at 10°C / min, and then gradually raised to 440°C at a rate of 1°C / min, and kept for 4 hours to obtain intermediate phase asphalt. The obtained mesophase pitch was detected by GB / T19227-2003 Determination of Nitrogen in Coal and Coke, wherein the N content was 0.85wt%.

[0050] The mesophase pitch prepared in Example 1 is observed under a polarizing microscope, and the polarizing microscope photo is shown in figure 1 . From figure 1 It can be seen from the polarizing microscope photos that the mesophase pitch presents a good fiber or needle-l...

Embodiment 2

[0056] Mix 200g of refined pitch from coal liquefaction (provided by Shanghai Research Institute of China Shenhua Coal-to-oil Chemical Co., Ltd.) with 10g of low-density polyethylene (provided by Shanghai Yunuo Import and Export Trading Co., Ltd.), and then place the mixture in a 500mL high-pressure In the kettle, after sealing, purging with nitrogen, so that the nitrogen pressure reaches 3.5MPa, the mixture is heated up to 200°C at 20°C / min, and then gradually heated to 400°C at a rate of 2.0°C / min, and kept for 12 hours to obtain intermediate Phase pitch, its polarized light microscope photo is shown in image 3 . The obtained mesophase pitch was detected by GB / T19227-2003 Determination of Nitrogen in Coal and Coke, and the N content was 0.98%.

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Abstract

The invention discloses an intermediate-phase asphalt and method for preparing the intermediate-phase asphalt from coal liquefaction refined asphalt. The method comprises the following steps: mixing coal liquefaction refined asphalt and additives to obtain a mixture; and carrying out co-carbonization polymerization reaction on the mixture to obtain the intermediate-phase asphalt, wherein the additives are high-molecular polymers. In the process of preparing the intermediate-phase asphalt from coal liquefaction refined asphalt, the high-molecular polymers can greatly inhibit excess carbonization through hydrogen transfer and alkyl transfer reactions in the medium and later reaction period of high-molecular polymers, and thus, can perform the functions of lowering the system viscosity and relieving the drastic reaction, thereby improving the system flowability, lowering the reaction rate, stabilizing and smoothing the reaction, and finally prolonging the carbonization temperature interval; and thus, the intermediate-phase asphalt with favorable fibrous structure is obtained.

Description

technical field [0001] The invention relates to the technical field of coal deep processing, in particular to a mesophase pitch and a method for preparing mesophase pitch by using coal liquefaction and refined pitch. Background technique [0002] Coal liquefaction refined asphalt is a bituminous substance extracted from coal liquefaction residue. It is mainly composed of polycyclic condensed aromatic hydrocarbons. It has the characteristics of high aromaticity, high carbon content, and easy polymerization or crosslinking. It has the characteristics that many petroleum asphaltenes do not have. It is very suitable as a raw material for the preparation of carbon materials. [0003] Patent CN101580729A discloses a method for preparing mesophase pitch by using coal liquefaction and refined asphalt in coal liquefaction residue. For example, refined asphalt from coal liquefaction is a highly reactive raw material, which reacts violently in the carbonization stage, the viscosity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/02
Inventor 常鸿雁李克健章序文张元新
Owner CHNA ENERGY INVESTMENT CORP LTD
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