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Mesophase pitch and method for preparing mesophase pitch by using coal liquefaction refined pitch

A technology for mesophase pitch and refined pitch, which is applied in the field of deep coal processing, can solve the problems of poor optical properties of mesophase pitch, influence the fusion of mesophase pitch, and maintain a short time in the liquid phase, so as to prolong the carbonization temperature range and reduce the System viscosity, the effect of improving fluidity

Active Publication Date: 2015-10-07
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, but because this method is mainly prepared by directly heating and pressurizing raw coal liquefaction and refined asphalt, and the performance of raw materials has a great impact on mesophase pitch The performance of coal liquefaction refined asphalt is a highly reactive raw material, the reaction is violent 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 poor , which affects the fusion of mesophase pitch, so the optical properties of the final prepared mesophase pitch are poor

Method used

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  • Mesophase pitch and method for preparing mesophase pitch by using coal liquefaction refined pitch
  • Mesophase pitch and method for preparing mesophase pitch by using coal liquefaction refined pitch
  • Mesophase pitch and method for preparing mesophase pitch by using coal liquefaction refined pitch

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Embodiment 1

[0040] The coal liquefaction refined pitch used in the following examples and comparative examples has the following characteristics: particle size≤5mm, quinoline insoluble content≤0.5wt%, softening point≥130°C.

[0041] Example 1

[0042] Fully mix 100g coal liquefaction refined pitch (provided by Shanghai Research Institute of China Shenhua Coal-to-oil Chemical Co., Ltd.) with 100g coking heavy oil (provided by Shanghai Baosteel Chemical Co., Ltd.), then place the mixture in a 500ml autoclave, seal it Purging with nitrogen to make the nitrogen pressure reach 0.5MPa, the mixture is heated up to 200°C at 20°C / min, and then gradually raised to 440°C at a rate of 1°C / min, and kept at constant temperature and pressure for 8 hours to obtain mesophase pitch .

[0043] 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 that the mesophase pitch has a fibrous s...

Embodiment 2

[0049] 150g coal liquefaction refined pitch (provided by Shanghai Research Institute of China Shenhua Coal Oil Chemical Co., Ltd.) and 50g anthracene oil (provided by Maanshan Steel Co., Ltd.) are fully mixed, then the mixture is placed in a 500ml autoclave, and after sealing Purging with nitrogen to make the nitrogen pressure reach 5MPa, the temperature of the mixture was raised to 200°C at 16°C / min, and then gradually raised to 400°C at a rate of 2.0°C / min, and kept at constant temperature and pressure for 16 hours to obtain fibrous structure. Mesophase pitch, its polarized light microscope photo is shown in image 3 .

Embodiment 3

[0051] Fully mix 125g coal liquefaction refined pitch (provided by Shanghai Research Institute of China Shenhua Coal-to-oil Chemical Co., Ltd.) with 75g coking heavy oil (provided by Shanghai Baosteel Chemical Co., Ltd.), then place the mixture in a 500ml autoclave, seal it Purging with nitrogen to make the nitrogen pressure reach 2.0MPa, the mixture is heated up to 200°C at a rate of 10°C / min, then gradually raised to 420°C at a rate of 3.0°C / min, and kept for 10 hours to obtain a fibrous structure mesophase Asphalt, the polarizing microscope photo of the mesophase pitch is shown in Figure 4 .

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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 for prolonging condensed cyclization reaction time to obtain a mixture; and carrying out co-carbonization polymerization reaction on the mixture to obtain the intermediate-phase asphalt. In the process of preparing the intermediate-phase asphalt from coal liquefaction refined asphalt, the additives for prolonging condensed cyclization reaction time, which are introduced in the medium and later reaction period, can greatly inhibit excess carbonization in the medium and later reaction period, thereby lowering the system viscosity, relieving the drastic reaction and being beneficial to preparing the intermediate-phase pellets through polycondensation; and the additives introduced can improve the system flowability, lower the reaction rate, stabilize and smooth the reaction and prolong the carbonization temperature interval in the later carbonization period, so the end product intermediate-phase asphalt has fewer molecular side chains and branched chains, has better molecular planarity and has better fibrous structure.

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. The performance of coal liquefaction refined asphalt is a highly reactive raw material, the reaction is violent in the carbonization stage, the viscosity ...

Claims

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Application Information

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