Process for working up particulate crude polyoxymethylene

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United States of America Patent

PATENT NO 8859721
SERIAL NO

13570904

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Abstract

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The invention relates to a process for working up particulate crude polyoxymethylene, which comprises the following steps:

    (a) introduction of the particulate crude polyoxymethylene into an extraction column (13) operated at a pressure in the range from 1 to 6 bar,(b) introduction of a polar extractant into the extraction column (13) with a temperature in the range from 95 to 140° C. and a pressure in the range from 1 to 6 bar,wherein from 10 to 1000 ppm, based on the amount of polar extractant introduced, of a buffer substance which buffers in the pH range from 7.5 to 11.5 are introduced into the extraction column (13).

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Patent Owner(s)

Patent OwnerAddress
BASF SE67056 LUDWIGSHAFEN

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Deininger, Jürgen Oftersheim, DE 5 20
Demeter, Jürgen Frankenthal, DE 8 12
Häffner, Rüdiger Neustadt, DE 3 5
Schulz, Ralf Speyer, DE 35 352
Stammer, Achim Freinsheim, DE 62 411

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