Abstract: Particulate polycondensates of thiourea, thiosemicarbazide, or thiocarbazide with aldehydes and phenolic or amine constituents adsorb heavy metals from aqueous solutions of their compounds, also mercury from its vapors.
Type:
Grant
Filed:
May 12, 1975
Date of Patent:
July 13, 1976
Assignees:
Hokuetsu Carbon Industry Co., Ltd, Yoshitaka Kobayashi
Inventors:
Yoshitaka Kobayashi, Kinjiro Sugai, deceased, by Katsuno Suqai, legal successor, by Hajime Sugai, legal successor, by Minoru Sugai, legal successor, by Shunji Sugai, legal successor, by Hiroshi Sugai, legal successor, Minoru Sugai