| 摘要 |
The amphoteric polymeric flocculant is prepd. by graft copolymerizing chitosan with maleic acid or fumaric acid at 20-100 deg.C for 0.5-10 hrs., in the presence of a catalyst selected from ceric ammonium nitrate and vanadium pentanitrate. The chitosan is obtained from the shell of a crab or a lobster etc.. The obtd. flocculant has both of cationic properties of amino gp. in chitosan component, and anionic properties of carboxyl gp. in maleic acid component, and is useful for wide range of pH. The obtd. polymer is natural and has biodegradable property, and prevents secondary pollution.
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