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Preparation method and application of high-purity medium-temperature coal pitch based super active carbon

A technology of coal tar and activated carbon, which is applied in the field of preparation of high-purity medium-temperature coal tar-based super activated carbon, can solve the problems of high self-discharge, poor cycle performance of electrode materials, etc., achieves developed pore structure, simple and easy preparation method, and realizes preparation and applied effects

Inactive Publication Date: 2019-01-04
山西煤炭进出口集团科学技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the preparation of super activated carbon, the ash content in the raw material has a very adverse effect on the electrochemical performance of the final electrode material. For example, high ash content will cause poor cycle performance and high self-discharge of the electrode material. The ash content in the material also has an adverse effect on the pore formation during the activation process of the material.

Method used

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  • Preparation method and application of high-purity medium-temperature coal pitch based super active carbon
  • Preparation method and application of high-purity medium-temperature coal pitch based super active carbon
  • Preparation method and application of high-purity medium-temperature coal pitch based super active carbon

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Weigh 10g block with a softening point of 125 o C, medium-temperature coal tar pitch with an ash content of about 15%, crushed into powder with a mortar, and sieved with an 80-mesh stainless steel screen to obtain medium-temperature coal tar pitch particles with a particle size of less than 180 μm;

[0037] (2) Weigh 6g of the above medium-temperature coal tar pitch particles, mix with 50ml of hydrochloric acid solution with a concentration of 3mol / L, and mix them at 80 o C under heating and stirring for 3h, using a water ring vacuum pump to filter, constantly using deionized water to wash until the filtrate reaches neutrality, and then at 100 o Blast drying under C for 8h to obtain pretreated medium temperature coal tar pitch particles;

[0038] (3) Weigh 4g of the above pretreated sample and mix it with 40ml of 10% hydrofluoric acid solution at 80 oFully heated and stirred at ℃ for 3h, filtered by water ring vacuum pump, washed with deionized water continuously ...

Embodiment 2

[0048] (1) Weigh 8g block with a softening point of 130 o C, medium-temperature coal tar pitch with an ash content of about 10%, crushed into powder with a mortar, and sieved with a 100-mesh stainless steel screen to obtain medium-temperature coal tar pitch particles with a particle size of less than 150 μm;

[0049] (2) Weigh 6g of the above medium-temperature coal tar pitch particles, mix with 30ml of hydrochloric acid solution with a concentration of 6mol / L, and mix them at 90 o C under heating and stirring for 2 h, using a water ring vacuum pump to filter, constantly using deionized water to wash until the filtrate reaches neutrality, and then at 80 o Blast drying under C for 10h to obtain pretreated medium temperature coal tar pitch particles;

[0050] (3) Weigh 3g of the above pretreated sample and mix it with 15ml of 20% hydrofluoric acid solution. o Fully heated and stirred for 5 hours at C, filtered with a water ring vacuum pump, washed with deionized water continuo...

Embodiment 3

[0056] (1) Weigh 12g block with a softening point of 100 o C, medium-temperature coal tar pitch with an ash content of about 20%, crushed into powder with a mortar, and sieved with a 100-mesh stainless steel screen to obtain medium-temperature coal tar pitch particles with a particle size of less than 150 μm;

[0057] (2) Weigh 10g of the above medium-temperature coal tar pitch particles, mix with 200ml of hydrochloric acid solution with a concentration of 2mol / L, and mix them at 60 o C under heating and stirring for 5h, using a water ring vacuum pump to filter, constantly using deionized water to wash in the filtering process until the filtrate reaches neutrality, and then at 120 o C under air blast drying 5h, obtains the medium temperature coal tar pitch particle of pretreatment;

[0058] (3) Weigh 7g of the above pretreated sample and mix it with 100ml of 8% hydrofluoric acid solution at 90 o Fully heated and stirred for 2 hours at C, filtered with a water ring vacuum pum...

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Abstract

The invention discloses a preparation method and application of high-purity medium-temperature coal pitch based super active carbon. Medium-temperature coal pitch is used as a raw material, medium-temperature coal pitch grains are obtained through crushing / screening and are mixed with a hydrochloric acid solution, and heating stirring, filtration and drying are performed to obtain a pretreatment sample; then, the sample is mixed with a hydrofluoric acid solution, and heating stirring, filtration and drying are performed to obtain a low-ash-content medium-temperature coal pitch raw material; then, the medium-temperature coal pitch raw material is mixed with KOH grains, the two materials are fully mixed evenly by using deionized water, drying is performed, then the obtained mixture is put ina tubular carbonization furnace for high-temperature thermal treatment, natural cooling is performed to room temperature, and washing, acid pickling, filtration and drying are performed to obtain thesuper active carbon. The product has very high price advantages on the aspect of application of supercapacitor electrode materials and shows excellent electrochemical property. Efficient and high-added-value utilization of the medium-temperature coal pitch is achieved, and the adverse influence of impurities in supercapacitors on the specific capacity and cycling stability of electrodes is avoided.

Description

technical field [0001] The invention relates to a preparation method and application of high-purity medium-temperature coal tar pitch-based super activated carbon, and belongs to the field of preparation of supercapacitor electrode materials. Background technique [0002] Medium-temperature coal tar pitch is a by-product of coking. It is a heavy mixture rich in various aromatic rings formed during high-temperature thermal cracking of coal, but it also contains a variety of inorganic salts and other impurities. The ash is mainly composed of SiO 2 , Fe 2 o 3 、Al 2 o 3 , CaO and MgO and other components. It is mainly used in the manufacture of coatings, electrodes, pitch coke and pitch carbon black and other products. Due to its sheet-like microstructure and high carbon content, pitch is an excellent precursor material for supercapacitor electrodes. [0003] Compared with metal oxides and conductive polymers, which are two types of supercapacitor electrode materials, supe...

Claims

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Application Information

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IPC IPC(8): C01B32/33
CPCC01B32/33
Inventor 王凯李松恩高超邢欢霍愈江李婕
Owner 山西煤炭进出口集团科学技术研究院有限公司
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