Polyglycol finishing process

Details Polyglycol finishing process Polyglycol finishing process

C - Chemistry, Metallurgy

08

G

C08G 65/30 (2006.01)

Patent

CA 2211106

Polyglycols having an OH equivalent weight of at least 700 can be finished with hypophosphorous acid to remove residual basic catalyst. Hypophosphorous acid forms salts with alkali metals such as potassium, to produce salts which have very low solubility in such polyglycols. These salts also form large, needle like crystals which are easily filterable. Polyglycol finishing processes utilizing hypophosphorous acid can be used to prepare polyols with low alkali metal concentrations while producing substantially less solid and liquid waste than conventional finishing processes.

Polyglycols ayant un poids en équivalent OH d'au moins 700 et pouvant être finis à l'aide d'acide hypophosphoreux de sorte que le catalyseur basique résiduel soit éliminé. L'acide hypophosphoreux forme des sels avec les métaux alcalins tels que le potassium, pour produire des sels très peu solubles dans de tels polyglycols. Ces sels forment également de grands cristaux aciculaires faciles à filtrer. Les procédés de finissage de polyglycols mettant en oeuvre l'acide hypophosphoreux permettent de préparer des polyols présentant de faibles concentrations de métaux alcalins, tout en produisant sensiblement moins de déchets solides et liquides que les procédés de finissage traditionnels.

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