| 摘要 |
PROBLEM TO BE SOLVED: To provide a recovery process of polymer latex from white water capable of more extending the life of a membrane by reducing the contamination of the membrane. SOLUTION: A recovery method of a polymer latex product from a white water emulsion includes a process (a) for bringing the white water emulsion into contact with a fixed ultrafiltration flat membrane, a process (b) for removing water and other low molecular substance from the white water emulsion and a process (c) for repeatedly recirculating the white water emulsion through the ultrafiltration flat membrane to form a conc. white water emulsion having polymer concn. higher than the initial polymer concn. of the white water emulsion. In this case, the white water emulsion passes through the ultrafiltration flat membrane as a turblent flow.
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