Knowledge

Pigment carbon black production method



According to the different production processes, the carbon black production method is divided into three types: furnace method, contact method (mainly tank method and no-slot method) and thermal cracking method. Yongfeng's carbon black products are produced using the most important and most commonly used production processes - furnace and gas.


1. The furnace method is to use a gaseous hydrocarbon (usually natural gas) or a liquid hydrocarbon (usually coal tar or eucalyptus oil) as a raw material in a closed reactor to supply a proper amount of air to form a closed turbulent system in the reactor. It is decomposed by thermal oxidation at high temperature to form carbon black (the carbon black produced can be controlled by quenching the flame), and then cooled and separated from the gas by using a filtration system. The furnace method is characterized by a wide selection of raw materials and a variety of carbon black properties.


A gas furnace method in which a gaseous hydrocarbon is used as a main raw material and a liquid furnace as a main raw material is called an oil furnace method.


Compared with other carbon black manufacturing methods, the oil furnace method can produce carbon black varieties with different performances, and has many characteristics such as high process adjustment means, high utilization rate per unit capacity and heat energy, low consumption of raw materials, low comprehensive energy consumption, and low cost. Therefore, it has become the leading method for the manufacture of carbon black. At present, more than 95% of the carbon black in the world is manufactured by the oil furnace method.


2. The trough method is to use a gasification of a solid hydrocarbon (crude) or a liquid hydrocarbon (an oil) in a gasification kettle, and a mixture of a combustible gas (usually using natural gas or coke oven gas or water gas) as a raw material. It is sent to the naturally ventilated fire room by a circularly arranged pipe network. Under the channel steel, it is incompletely burned by thousands of porcelain burners to form a fishtail-shaped diffusion flame, its reducing layer and slowly reciprocating channel steel. In contact with each other, the carbon black formed by the cracking is deposited on the surface of the channel steel, and the process of generating carbon black is collected by cooling on the channel surface. The yield of pigment carbon black produced by this process is lower than that of the furnace method, but the primary particles have a small particle size and have better performance in terms of blackness and tinting strength.


The tankless mixing method is an improved process of gas black which does not have channel steel in the fire chamber when the carbon black is produced by the gas method, and only the carbon black suspended in the flue gas is collected in the production. Compared with the groove method, the grooveless gas mixing method has a large production capacity, but since the channel steel is eliminated, the flame control is not as good as the groove method and the drum method, and the blackness of the carbon black generated is slightly lower than that of the groove method or the drum method.