发明名称 |
METHOD FOR INHIBITING POLYMERIZATION DURING THE RECOVERY AND PURIFICATION OF UNSATURATED MONONITRILES |
摘要 |
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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申请公布号 |
US2004110977(A1) |
申请公布日期 |
2004.06.10 |
申请号 |
US20020309962 |
申请日期 |
2002.12.04 |
申请人 |
ROSEN BRUCE I.;FIRTH BRUCE E. |
发明人 |
ROSEN BRUCE I.;FIRTH BRUCE E. |
分类号 |
C07C253/26;C07C253/32;C07C255/08;(IPC1-7):C07C253/26 |
主分类号 |
C07C253/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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