公开(公告)号：US3860496A

公开(公告)日：1975-01-14

申请号：US21354471

申请日：1971-12-29

Applicant: SNAM PROGETTI

Inventor： GINNASI ALESSANDRO ,  RESCALLI CARLO

IPC: C07C7/08 ,  C07C11/18 ,  B01D3/34

CPC classification number: C07C7/08 ,  C07C11/18

Abstract: A multi-stage method is disclosed whereby isoprene of high purity is recovered from mixtures of C5 hydrocarbons containing it, wherein the mixture is subjected to a first extractive distillation stage in the presence of a solvent, such as morpholine and N-formyl-morpholine, containing water and in which olefinic and saturated hydrocarbons are withdrawn as a top product; a second extractive distillation stage effects the withdrawal of the major part of the cyclopentadiene and acetylene compounds present in the bottom product of the first stage as a sidestream and said solvent constitutes a bottom product for recycling to said first and second stage; in a third extractive distillation stage the top product of the second stage is treated with solvent containing water, fed to the third stage from a stripper and then recycled as bottom product to said stripper; and, in a rectification stage, isoprene of desired purity is recovered from the overhead product of the third extractive distillation stage.

Abstract translation: 公开了一种多级方法，其中从含有它的C5烃的混合物中回收高纯度的异戊二烯，其中混合物在溶剂例如吗啉和N-甲酰基吗啉存在下进行第一萃取蒸馏阶段， 含有水，其中烯属和饱和烃作为顶级产品被取出; 第二萃取蒸馏阶段使作为侧流的第一阶段的底部产物中存在的环戊二烯和乙炔化合物的主要部分退出，并且所述溶剂构成用于再循环到所述第一和第二阶段的底部产物; 在第三萃取蒸馏阶段中，第二阶段的顶部产物用含溶剂的水处理，从汽提塔进料至第三阶段，然后作为底部产物再循环至所述汽提塔; 并且在精馏阶段，从第三萃取蒸馏阶段的塔顶产物中回收所需纯度的异戊二烯。

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。