公开(公告)号：US3896007A

公开(公告)日：1975-07-22

申请号：US30522772

申请日：1972-11-10

Applicant: SNAM PROGETTI

Inventor： RESCALLI CARLO ,  REBORA PIERLUIGI ,  GINNASI ALESSANDRO

IPC: C07C255/08 ,  B01D20060101 ,  B01D3/34 ,  B01D3/40 ,  C07B20060101 ,  C07C20060101 ,  C07C67/00 ,  C07C253/00

CPC classification number: C07C253/34 ,  Y10S203/03 ,  C07C255/08

Abstract: In a process for the plural stage recovery of acrylonitrile, comprising a first stage extractive distillation zone, a second stage rectification zone and a third stage stripping zone; an improvement which comprises, maintaining the contents of the first stage extractive distillation zone and the second stage rectification zone at a pH in the range of about 5.5 to 7.5.

Abstract translation: 在多级回收丙烯腈的方法中，包括第一阶段萃取蒸馏区，第二阶段精馏区和第三阶段汽提区; 其改进包括将第一阶段萃取蒸馏区和第二阶段精馏区的含量保持在约5.5至7.5范围内的pH。