Method for increasing the yield of 2,6 -NDA

Disclosed is a method of increasing the yield of 2,6-NDA which comprises:a) Dissolving a disproportionation reaction product containing a dialkali salt of 2,6-NDA in water and filtering off insoluble matter from the resulting solution;b) Precipitating the monoalkali salt of 2,6-NDA (KHNDA) with CO2;...

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Bibliographische Detailangaben
Hauptverfasser:	BROWNSCOMBE THOMAS F, DIAZ ZAIDA
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	Disclosed is a method of increasing the yield of 2,6-NDA which comprises:a) Dissolving a disproportionation reaction product containing a dialkali salt of 2,6-NDA in water and filtering off insoluble matter from the resulting solution;b) Precipitating the monoalkali salt of 2,6-NDA (KHNDA) with CO2;c) Suspending said monoalkali salt in water in a weight ratio higher than 8:1, water: monosalt; andd) Heating at a temperature above 100° C. and at a pressure above 100 psig.The improvements in yield are from about 20% to as high as 45%.