Title:
不飽和モノニトリル類の回収及び精製中に重合を阻止する方法
Document Type and Number:
Japanese Patent JP2006509030
Kind Code:
A
Abstract:
Economical processes are disclosed for recovery and refining of valuable nitrogen-containing organic compounds formed by catalytic oxidation of least one feed compound selected from the group consisting of propane, propylene, isobutane and isobutylene in the presence of ammonia to produce a gaseous. Processes of the invention include quenching the gaseous reactor effluent with an aqueous quench liquid; forming an aqueous solution comprising the corresponding unsaturated mononitrile, hydrogen cyanide and other organic co-products; and using an integrated sequence of distillations and phase separations to recover for recycle of a useful aqueous liquid, and obtain the desired nitrogen-containing products. According to the invention aqueous solutions are fractionated in an integrated system of multi-stage columns while an effective polymerization inhibiting amount of at least one member of a preselected class of p-phenylenediamine compounds is maintained therein.
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Inventors:
Rosen, Bruce Eye
Firth, Bruce Yee
Firth, Bruce Yee
Application Number:
JP2004559113A
Publication Date:
March 16, 2006
Filing Date:
November 12, 2003
Export Citation:
Assignee:
The Standard Oil Company
International Classes:
C07C253/32; C07C253/26; C07C253/34; C07C255/08; C07B61/00
Domestic Patent References:
| JP2002540188A | 2002-11-26 | |||
| JPH02248402A | 1990-10-04 | |||
| JP2001513523A | 2001-09-04 |
Foreign References:
| US4720566A | 1988-01-19 |
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Minako Matsuyama
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Minako Matsuyama