Process for the distillation of a mixture of isomeric diisocyanatodiphenylmethanes

A mixture of isomeric diisocyanatodiphenylmethanes composed of at least 2,2′-diisocyanato-diphenylmethane, 2,4′-diisocyanatodiphenylmethane and 4,4′-diisocyanatodiphenyl-methane is distilled in at least one stage and a divided-wall column is used in at least one distillation stage.

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Hauptverfasser:	Schal, Hans-Peter, Wolf, Ulrich, Thelen, Bernd
Format:	Patent
Sprache:	eng
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creator	Schal, Hans-Peter Wolf, Ulrich Thelen, Bernd
description	A mixture of isomeric diisocyanatodiphenylmethanes composed of at least 2,2′-diisocyanato-diphenylmethane, 2,4′-diisocyanatodiphenylmethane and 4,4′-diisocyanatodiphenyl-methane is distilled in at least one stage and a divided-wall column is used in at least one distillation stage.
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title	Process for the distillation of a mixture of isomeric diisocyanatodiphenylmethanes
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