专利名称：Method for inhibiting polymerization during
the recovery and purification of unsaturatedmononitriles
发明人：Bruce I. Rosen,Bruce E. Firth申请号：US10852277申请日：20040524公开号：US07282600B2公开日：20071016
摘要：Economical processes are disclosed for recovery and refining of valuablenitrogen-containing organic compounds formed by catalytic oxidation of least one feedcompound selected from the group consisting of propane, propylene, isobutane andisobutylene in the presence of ammonia to produce a gaseous. Processes of the inventioninclude quenching the gaseous reactor effluent with an aqueous quench liquid; formingan aqueous solution comprising the corresponding unsaturated mononitrile, hydrogencyanide and other organic co-products; and using an integrated sequence of distillationsand phase separations to recover for recycle of a useful aqueous liquid, and obtain thedesired nitrogen-containing products. According to the invention aqueous solutions arefractionated in an integrated system of multi-stage columns while an effectivepolymerization inhibiting amount of at least one member of a preselected class of p-phenylenediamine compounds is maintained therein.
申请人：Bruce I. Rosen,Bruce E. Firth
地址：Park Ridge IL US,Buffalo Grove IL US
国籍：US,US
代理人：David P. Yusko
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