| 摘要 |
PROBLEM TO BE SOLVED: To provide processes for recovery and refining of valuable nitrogen-containing organic compounds formed by catalytic oxidation of at least one feed compound selected from the group consisting of propane, propylene, isobutane and isobutylene in the presence of ammonia to produce a gas. SOLUTION: The processes include a step of quenching the gaseous reactor effluent with an aqueous quench liquid; a step of forming an aqueous solution comprising the corresponding unsaturated mononitrile, hydrogen cyanide and other organic co-products; and a step of 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. 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. COPYRIGHT: (C)2011,JPO&INPIT
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