A Comprehensive Explanation of Methods for Increasing the Specific Surface Area of Acetylene Carbon Black

Title: Methods for Increasing the Specific Surface Area of Acetylene Carbon Black to over 200


Optimization of Production Process
Pyrolysis Method: When producing acetylene carbon black by pyrolysis, precisely control parameters such as reaction temperature and time. High temperature and appropriately extending the reaction time can enable full pyrolysis of acetylene, which is conducive to the formation of more pore structures and an increase in the specific surface area. For example, control the reaction temperature between 1400 °C and 1800 °C.
- Oxygen-enriched Air Method: Replace ordinary air with oxygen-enriched air to accelerate the combustion and pyrolysis speed of acetylene, making the generated carbon black particles finer and the structure looser, thereby increasing the specific surface area.

Improvement of Raw Material Quality
Selection of High-purity Acetylene: High-purity acetylene has fewer impurities, and the carbon black produced by pyrolysis has a more regular structure and a larger specific surface area. Acetylene can be purified to remove impurities such as hydrogen sulfide and phosphine.

Application of Physical Modification Methods

Ball Milling Treatment: Conduct ball milling on acetylene carbon black to refine the carbon black particles, reduce agglomeration, and increase the specific surface area. At the same time, it can also destroy the crystal structure of the carbon black, creating more defects and pores to further improve the specific surface area. Generally, the ball milling time is controlled at about 5 - 10 hours.

Use of Chemical Modification Means
Doping Modification: Introduce specific elements for doping during the preparation process of acetylene carbon black. For example, nitrogen doping can change the surface chemical properties and electronic structure of the carbon black, weaken the interaction between carbon black particles, make them easier to disperse, and then increase the specific surface area.
- Surface Oxidation: Appropriate surface oxidation treatment can introduce oxygen-containing functional groups on the surface of the carbon black, increase the surface active sites, reduce the agglomeration degree of carbon black particles, and improve the specific surface area. Oxidants such as ozone and hydrogen peroxide can be used for treatment.