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Low-alkali activated preparation method and application of pitch-based activated carbon

A technology based on activated carbon and asphalt, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of short service life of equipment, low conductivity of products, uneven quality, etc., and achieve the effect of prolonging service life, shortening reaction time and saving alkali consumption

Active Publication Date: 2015-12-23
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem solved by the present invention is to overcome the defects of large amount of alkali, short service life of equipment, pollution of the environment, low conductivity of the product and uneven quality existing in the activated carbon preparation process in the prior art, and further provide a kind of activated carbon with small amount of alkali However, the preparation method of pitch-based activated carbon with high conductivity, good quality uniformity, energy saving and environmental protection

Method used

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  • Low-alkali activated preparation method and application of pitch-based activated carbon
  • Low-alkali activated preparation method and application of pitch-based activated carbon
  • Low-alkali activated preparation method and application of pitch-based activated carbon

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Effect test

Embodiment 1

[0043] The low-alkali activation preparation method of pitch-based activated carbon described in this embodiment includes:

[0044] Coking step: place modified pitch with a sulfur content of less than 1wt% and a carbon content greater than 90wt% (its quality standard conforms to the provisions of YB / T5194-2003) in a coking furnace, under nitrogen protection, at a speed of 1.5°C / min Raise the temperature to 480°C, and perform coking treatment for 9 hours to obtain raw coke;

[0045] Mixing step: pulverizing the raw coke, screening the raw coke powder with a particle size of 350-400 mesh; mixing the green coke powder and solid potassium hydroxide evenly according to the mass ratio of 1:1.7, and grinding to form a mixed powder;

[0046] Pre-activation step: put the mixed powder in the activation furnace, stir continuously at a speed of 30rpm, and under the protection of nitrogen, raise the temperature to 250°C at a speed of 5°C / min, keep it warm for 30min, and then raise the temp...

Embodiment 2

[0051] The low-alkali activation preparation method of pitch-based activated carbon described in this embodiment includes:

[0052] Coking step: putting coal tar pitch with a sulfur content of less than 1wt% and a carbon content of more than 90wt% in a coking furnace, under nitrogen protection, heating up to 450°C at a rate of 10°C / min, and coking for 10 hours to obtain green coke;

[0053] Mixing step: crushing the raw coke, screening the raw coke powder with a particle size of 300-500 mesh; mixing the raw coke powder and solid potassium hydroxide evenly according to the mass ratio of 1:2, and grinding to form a mixed powder;

[0054] Pre-activation step: put the mixed powder in the activation furnace, stir continuously at a speed of 50rpm, and under the protection of nitrogen, raise the temperature to 300°C at a speed of 0.5°C / min, keep it warm for 30min, and then raise the temperature to 400°C, keep warm for 100min, then cool naturally to get the preactivated product;

[0...

Embodiment 3

[0059] The low-alkali activation preparation method of pitch-based activated carbon described in this embodiment includes:

[0060] Coking step: put petroleum pitch with a sulfur content of less than 1wt% and a carbon content of more than 90wt% in a coking furnace, raise the temperature to 460°C at a rate of 0.5°C / min under the protection of argon, and perform coking treatment for 15 hours to obtain raw coke;

[0061] Mixing step: pulverize the raw coke, screen out the raw coke powder with a particle size of 450-500 mesh; mix the raw coke powder and solid sodium hydroxide evenly according to the mass ratio of 1:1, and grind to form a mixed powder;

[0062] Pre-activation step: put the mixed powder in the activation furnace, stir continuously at a speed of 100rpm, and under the protection of argon, raise the temperature to 350°C at a speed of 10°C / min, keep it warm for 80min, and then heat it at 5°C / min The temperature was raised to 500°C at a high speed, kept at a temperature ...

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Abstract

The invention provides a low-alkali activated preparation method and application of pitch-based activated carbon. The method comprises the steps that pitch is taken as the raw materials and sequentially processed through coking, mixing with solid alkali, pre-activating, activating, cleaning and the like, and the pitch-based activated carbon is prepared. According to the preparation method, green coke and the alkali are mixed evenly through pre-activating treatment, and on one hand, contact of the green coke and the alkali is enlarged, so that the preparation method has the advantages that at least three eighths of the alkali using amount is saved compared with the prior art, the service life of an activating oven is prolonged, the discharge quantity and treatment difficulty of cleaning effluent are reduced, and the advantages of energy conservation and environment protection are achieved; on the other hand, the quality homogeneity of the activated carbon can be improved, and property difference among the products of different batches can be avoided; in addition, activating treatment is performed on pre-activating products by quickly increasing the temperature, corrosion of the strong alkali on equipment at high temperature for a long time is reduced, the number of functional groups on the surface of the activated carbon can be reasonable, and improvement of the electric conductivity of the products is facilitated.

Description

technical field [0001] The invention relates to the field of preparation of activated carbon, in particular to a low-alkali activation preparation method and application of pitch-based activated carbon with high electrical conductivity. Background technique [0002] Supercapacitor is a new type of energy storage device between electrolytic capacitors and batteries. It not only has the characteristics of high specific power and high cycle performance of capacitors, but also has the characteristics of energy storage of batteries. The use requirements of high specific energy make supercapacitors have a very wide range of applications and a huge potential market, and have become a research hotspot in the field of new energy. [0003] The energy storage principle of a supercapacitor is based on the electric double layer formed under the charging of the electrode. Therefore, the performance of the electrode is a key factor restricting the application of the supercapacitor, which r...

Claims

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Application Information

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IPC IPC(8): C01B31/12H01G11/34
CPCY02E60/13
Inventor 崔永君洪东升刘冬冬李超毅于春林
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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