| 摘要 |
PROCESS FOR ISOLATING METTI),121YCIIIENITRILE-J/I,NL-DIACCIONITRIICS FROM AN AQUEOUS CRUDE RR@XTURE THE INVENNON JELATES IO A PROCESS FOI ISOLATING DIACETONITRILE (NIGDNI) FIOM AN AQUEOUS EMULSION WHICH COMPRISES N4GDN AND HAS AN MGDN CONTENT OF 3-50BY WEIGHT IN A CRYSTALLIZER, COMPRISING THE STEPS: (A) THE AQUEOUS EMULSION IS, STARTIN- FJOM A TEMPERATURE ABOVE THE SOLIDIFICATION POINT, COOLED TO A TEMPERATURE BELOW THE SOLIDIFICATION POINT, THE COOLING RATE AVERAGED OVER TIME NOT EXCEEDING 5 K/H, UNTIL SUBSTANTIALLY THE ENTIRETY OF THE EMULSIFIED MGDN HAS SOLIDIFIED. 10 (B) THE RESULTING AQUEOUS SUSPENSION IS COOLED FURTHER AND/OR CONCENTRATED, AND THE COOLING RATE MAY BE GREATER THAN IN STEP (A). (FIGURE 2)
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