| 摘要 |
A nitrogen-containing prepolymer is prepared by adding an epihalohydrin, particularly epichlorohydrin, to piperazine in an amount of more than one mole of epihalohydrin per mole of piperazine, in the substantial absence of strong base. The prepolymer is reacted with polyalkylene polyamines in the absence of strong base to produce a polymeric flocculant.
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