The process preparing bead (spherical) activated carbon, to be used for fluidized bed adsorption such as waste water treatment, has been developed as a modification of the process previously reported in Part 1.
In the fundamental study, the following two processes have been developed:
1. Rolling Granulation System.
Asphalt such as vacuum residue reacts with elemental sulfur to form a partly-fusible intermediate, which is then crushed and heated in the rotary kiln to produce a bead product, and this product is carbonized and activated in an ordinary method.
2. Suspension Granulation System.
Asphalt such as vacuum residue reacts with elemental sulfur in aquous solution of PVA under high-speed agitation in an autoclave to form a bead product, and this product is carbonized and activated in an ordinary method.
It was found that the latter process was superior to the former one and the quality of the bead activated carbon was comparable to a commercial market product except for the apparent bulk density and the mechanical strength.