What is the difference between wood activated carbon and coal activated carbon
In the field of liquid phase adsorption: coal activated carbon containing heavy metals and high ash, the purity of the product is relatively low, and because the production mainly uses the physical method, pores are mainly micropores, suitable for small molecules, the application scope is relatively narrow, generally used in industrial liquid adsorption stone, metallurgy, printing and dyeing wastewater treatment; while the ash of wooden activated carbon is low, less impurities, easy purification, distribution of pore structure production process of chemical method under the easy adjustment of the activated carbon, micropore and mesopore were developed and widely used, especially in the field of application of food and beverage, pharmaceutical and other high performance requirements on adsorption, higher requirements for product safety. There is no substitute for coal activated carbon.
Wood activated carbon is made of sawdust, shell and other forest products, "three residue" as the raw material for the production of activated carbon products, coal activated carbon is made of coal as the raw material of activated carbon products. Due to the production of raw materials, wood activated carbon and activated carbon are different in the production process, technical characteristics, product characteristics and other aspects, which affects the application of relative distinction, specifically:
From the long-term trend: coal is a non renewable resource, a substantial increase in carbon dioxide emissions of coal activated carbon resources are limited and the production process, so the product price of raw materials and environmental protection cost push upward trend; and wooden activated carbon because the main raw material for the forest "three residues, renewable, and the price is expected due to technical progress tends to be relatively decreased, so the wooden activated carbon is higher than the long-term competitive advantage of coal based activated carbon.
In the field of gas phase adsorption: coal activated carbon products high strength and easy recycling, so often used in gas phase adsorption; activated carbon intensity is low, not traditionally used for gas phase adsorption, however, with the advancement and improvement of production technology, application of wooden activated carbon has been expanded to some the new gas adsorption fields such as oil and gas recovery, household air purification, and with the people for health and environmental protection to improve the level of attention, in the gas phase adsorption and its application in the field of space will be further increased.
