ポリビニルピリジン四級塩のカオリン懸濁液に対する凝集効果

概要

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Various quaternary poly- (2- or 4-vinylpyridinium) salts (QP2P or QP4VP) were prepared by the alkylation of poly- (2- or 4-vinyl-pyridine) with various alkyl bromides.<BR>Flocculation test for 5% kaolin suspension was carried out to elucidate the effect of the chain length of the alkyl bromides and the degree of quaternization. The influence of pH value and the concentration of kaolin suspension on the flocculation effect were examined.<BR>Flocculation ability of the quaternary salts was evaluated by sedimentation rate, sedimentation volume and turbidity.<BR>The results obtained are as follows. 1) QP 2 VP or QP 4 VP obtained from the higher alkyl bromides showed high rate of sedimentation. 2) The bulky precipitation was obtained with QP 2 VP or QP 4 VP derived from the higher alkyl bromides. 3) The lower charge density of QP 2 VP was effective for clarity of supernatant, and QP 2 VP or QP 4 VP derived from the higher alkyl bromides showed good properties. 4) The rate of sedimentation or clarity of supernatant decreased rapidly at the pH value of 6 to 7.5. 5) Kaolinconcentration from 2.5 to 10% decreased rapidly the sedimentation rate. 6) QP 2 VP or QP 4 VP was more effective comparing with the commercial f locculants such as SUMI-FLOC, PAS-A, and HIMONIC Neo-600.
日本油化学会の論文