Acetylene black is the carbon black obtained by continuous pyrolysis of acetylene with purity above 99%, which is obtained by Calcium carbide method or decomposition and refining of by-product gas during Naphtha (crude gasoline) pyrolysis. Raise the temperature inside the reaction furnace to above 800 ℃ for the initial temperature of acetylene decomposition, and then introduce acetylene for thermal decomposition. Because it is an Exothermic reaction, the reaction can be carried out automatically. In order to achieve stable quality, the reaction temperature should be maintained at around 1800 ℃. The temperature inside the furnace can be controlled through the water-cooled jacket of the outer cylinder of the reaction furnace. Acetylene black is used together with chromium oxide and electrolyte as the negative material of Nickel–metal hydride battery. Compared with furnace process carbon black, it has more developed crystallization and secondary structure, so its conductivity and liquid absorption are also better. Since there are few impurities such as heavy metals, the loss caused by self discharge is small. It is mainly used as the negative pole of Nickel–metal hydride battery, and Li batteries are also used.

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