VERFAHREN ZUR ERHALTUNG EINER HOHEN AUSBEUTE VON ACRYLNITRIL UND CYANWASSERSTOFF BEI DER AMMOXIDATION VON PROPYLEN.

摘要

A process for conducting long-term ammoxidation of propylene in the presence of a metal oxide catalyst for ammoxidation of propylene at a temperature of from 300 DEG C to 500 DEG C to produce acrylonitrile and hydrogen cyanide, wherein in the process each of (A) elemental phosphorus or a phosphorus compound and (B) elemental tellurium or a tellurium compound is added as a regenerating agent at least once to the ammoxidation reaction system in accordance with the progress of the reaction, the regenerating agent (A) being added when the yields of both of acrylonitrile and hydrogen cyanide are reduced, and the regenerating agent (B) is chosen when the yield of acrylonitrile is reduced and the yield of hydrogen cyanide is unchanged or increased, to thereby maintain high levels of yields of acrylonitrile and hydrogen cyanide.