| 摘要 |
948,719. Recovery of n-butyl acrylate by extractive distillation. KNAPSACK GRIESHEIM A.G. Aug. 3, 1962 [Sept. 21, 1961], No. 29931/62. Heading C2C. n-Butyl acrylate separated from an admixture with n-butanol, di-n-butyl ether, n-butyl acetate and other contaminants by adding acetophenone to the mixture and distilling off the undesired components and finally separating the acetophenone/n-butyl acrylate residue thus obtained by fractional distillation. Both the extractive distillation and fractional distillations are preferably carried out in vacuo. 5 to 10 times by weight of acetophenone on the weight of mixture is employed for preference and a polymerization stabilizer e.g. hydroquinone, pyragallol or phenothiazine is added to the mixture prior to separation. The examples employ bubble tray columns for the distillative extraction stage. |
