| 摘要 |
Arsonic acid derivatives of polyvinyl phenols are used for the extraction, concentration and purification of ions from solution under either static or dynamic conditions. They are particularly adapted for the extraction of uranium from dilute solutions. Specification 762,085 is referred to.ALSO:Arsonic acid derivatives of polyvinyl phenols may be produced either by diazotizing a polyvinyl aminophenol and then arsonating the diazo compound obtained, or by diazotising an arsonated amino-aromatic compound in the presence of a polyvinyl phenol. Polyvinyl phenols specified are poly-p-vinyl phenol and copolymers of vinyl phenol with substituted vinyl phenols, e.g. p-acetoxy styrene, or with vinyl monomers, such as divinyl benzene, which form cross-linked products. Specified derivatives are poly (hydroxy-styrene arsonic acid) and poly(hydroxy-styrene azo-arsanilic acid). The products have ion-exchange and metal chelating properties and may be used in the form of soluble or insoluble resins or as membranes in ionic systems. In Example I p-acetoxy styrene is copolymerized with divinyl benzene, the copolymer is hydrolysed, nitrated and reduced to give poly (3-amino-4-hydroxy-styrene) which is then diazotized and finally arsonated using sodium arsenite, sodium carbonate and copper sulphate. In Example 2 o-arsanilic acid is diazotized in the presence of a p-acetoxy styrene/divinyl benzene copolymer. Specification 762,085 also is referred to. |
