Process for separating polyvinyl alcohol from its solution
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United States of America Patent
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-
Oct 7, 1980
Issued Date -
N/A
app pub date -
Dec 21, 1977
filing date -
Dec 20, 1974
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for coagulating particles of dissolved solids from an aqueous solution is provided. The apparatus includes an upright stirring vessel and a rotatable stirrer. The stirrer includes a substantially vertical shaft having a plurality of flat, radially extending blades secured symmetrically around the shaft such that the flat surfaces of each blade are substantially parallel to the plane of rotation of the blades. A plurality of knives extends upwardly and downwardly from each blade, each knife being a flat piece fixed to the top or underside surface of the blade so as to be approximately perpendicular to the longitudinal direction of the blade to which it is fixed and the flat surfaces of each knife being substantially tangential to the cylindrical plane of rotation of the knife. In a further embodiment of the apparatus, obstructing plates are secured to the inner wall of the vessel so as to obstruct the swirling motion in the solution provided by the stirrer.
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