| 摘要 |
<p>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; and d) Heating at a temperature above 100 DEG C and at a pressure above 100 psig. The improvements in yield are from about 20 % to as high as 45 %.</p> |
