| 摘要 |
PROBLEM TO BE SOLVED: To prevent mixture of tar acids in quinoline, isoquinoline and quinaldine in recovering quinoline, isoquinoline and quinaldine by subjecting tar bases to superfractionation. SOLUTION: Tar bases obtained from coal tar are distilled under reduced pressure to distill away quinoline, then distilled under normal pressure to distill away tar acids, distilled under reduced pressure a second time to recover isoquinoline and quinaldine. Consequently, quinoline, isoquinoline and quinaldine containing no tar acids are recovered. COPYRIGHT: (C)2004,JPO
|
