Invention Grant
US3896007A PH Control of recycle water in the plural stage distillation of a crude acrylonitrile feed
失效
PH在粗丙烯腈原料的多级蒸馏中的循环水的控制
- Patent Title: PH Control of recycle water in the plural stage distillation of a crude acrylonitrile feed
- Patent Title (中): PH在粗丙烯腈原料的多级蒸馏中的循环水的控制
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Application No.: US30522772Application Date: 1972-11-10
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Publication No.: US3896007APublication Date: 1975-07-22
- Inventor: RESCALLI CARLO , REBORA PIERLUIGI , GINNASI ALESSANDRO
- Applicant: SNAM PROGETTI
- Assignee: SnamProgetti SpA
- Current Assignee: SnamProgetti SpA
- Priority: IT3119571 1971-11-17
- Main IPC: C07C255/08
- IPC: C07C255/08 ; B01D20060101 ; B01D3/34 ; B01D3/40 ; C07B20060101 ; C07C20060101 ; C07C67/00 ; C07C253/00
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.
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