1. Plant raw materials (wood raw materials)
Activated carbon has a wide range of wood materials. Commonly used are: charcoal, coconut shell, wood chips, bark, walnut shell, apricot shell, peach shell, rice husk, bamboo, coffee bean stem, oil palm shell, furfural residue and pulp waste. Liquid, etc. Wood Activated Carbon occupy a very important position in China's activated carbon industry. Among them, coconut shell, walnut shell, peach shell and apricot shell are the best, but due to the limited raw materials, it restricts its development.
Coal is the raw material for the manufacture of activated carbon. Activated carbon can be produced from almost all coals. Among them, anthracite, weak coal, lignite and peat with short coal formation time are excellent raw materials for the manufacture of activated carbon. Due to the abundant coal resources, wide distribution and low price, it is a good prospect to produce activated carbon from coal.
3. Petroleum raw materials
Petroleum raw materials mainly refer to carbon-containing products and waste materials in the petroleum refining process. For example, petroleum asphalt, petroleum coke, petroleum oil residue, and the like. In the early 1990s, the Shanxi Institute of Coal Chemistry of the Chinese Academy of Sciences used oil with low ash content and low impurity content (<0.01%).
The activity of activated carbon is changed by the temperature of the activated carbon. It can be seen from the adsorption efficiency curve that most of the light oil cannot be adsorbed when the temperature is raised to 80 degrees. At this time, it is necessary to improve the operating conditions and reduce the temperature of the activated carbon before adsorption, which is the most critical link in the adsorption operation.
We are trying to reduce the temperature of activated carbon in the adsorption of small swordsman at normal pressure. It is the only way to improve the adsorption efficiency. Firstly, the adsorption efficiency is solved from the exothermic phenomenon, which is a measure we must take. The heat of adsorption is proportional to the amount of adsorption in a certain temperature range. A large amount of heat is not conducive to adsorption, and the heat of adsorption is completely controllable.