Abstract A heavy metal adsorbing resin of which the main polymer chain consists of an aliphatic hydrocarbon skeleton and which contains at least one functional group selected from amino, polyalkylene polyamino, hydrazido, thioureido, thiosemicarbazido, isothiocyanato, thiobiuret, N-thioaminobiuret, and Nthiocarbamoyl-polyalkylene amino groups. Heavy metals can be removed from a solution containing them by contacting the solution with the above heavy metal adsorbing resin. The resin has a markedly high rate of adsorbing the heavy metals, and can be easily regenerated with a mineral acid or sodium sulfide. The suitable time of regenerating or replacing the resin can be detected by its color change upon adsorption of the heavy metals.
A HEAVY METAL ADSORBING RESIN CONSISTING ESSENTIALLY OF A POLYMER COMPRISING: A. A BACKBONE POLYMER SELECTED FROM POLYSTYRENE, POLYVINYL CHLORIDE, A COPOLYMER OF VINYL CHLORINE WITH ANOTHER COPOLYMERIZABLE MONOMER, A GRAFT COPPLYMER OF A RUBBERY SUBSTANCE TO WHICH VINYL CHLORIDE HAS BEEN GRAFTED AND A CHLORINATED POLYOLEFIN, AND B. A MOIETY ATTACHED TO THE BACKBONE POLYMER WHICH IS SELECTED FROM AT LEAST ONE THIOUREIDE OF THE GROUP CONSISTING OF -NHCSNHR, WHEREIN R IS A HYDROGEN ATOM ALKYL MOIETY, ARYL MOIETY, OR ACYL MOIETY.
Claim 2
Dependent Claim
83 words
A HEAVY METAL ADSORBING RESIN CONSISTING ESSENTIALLY OF A POLYMER COMPRISING: A. A BACKBONE POLYMER SELECTED FROM POLYSTYRENE, POLYVINYL CHLORIDE, A COPOLYMER OF VINYL CHLORINE WITH ANOTHER COPOLYMERIZABLE MONOMER, A GRAFT COPPLYMER OF A RUBBERY SUBSTANCE TO WHICH VINYL CHLORIDE HAS BEEN GRAFTED AND A CHLORINATED POLYOLEFIN, AND B. A MOIETY ATTACHED TO THE BACKBONE POLYMER WHICH IS SELECTED FROM AT LEAST ONE THIOUREIDE OF THE GROUP CONSISTING OF -NHCSNHR, WHEREIN R IS A HYDROGEN ATOM ALKYL MOIETY, ARYL MOIETY, OR ACYL MOIETY.
Claim 3
Dependent Claim
20 words
The resin of claim 1 wherein said polymer contains at least one said functional group per about 250 monomer units.