Patent AT-E400549-T1: [Translated] METHOD FOR INHIBITING POLYMERIZATION DURING RECOVERY AND PURIFICATION OF UNSATURATED MONONITRILS
Description
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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https://pubchem.ncbi.nlm.nih.gov/patent/AT-E400549-T1 |
Tags
- patent
- chemistry
- research
- innovation
- pubchem