Process for maintaining high level of yield of acrylonitrile and

Details Process for maintaining high level of yield of acrylonitrile and Process for maintaining high level of yield of acrylonitrile and

1988-10-05

1992-11-03

Langel, Wayne

Chemistry of inorganic compounds

Nitrogen or compound thereof

Carbon containing

558322, C01C 302, C07C25326

Patent

active

051607212

ABSTRACT:
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.degree. C. to 500.degree. 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.

REFERENCES:
patent: 4124631 (1978-11-01), Hayami et al.
patent: 4409122 (1983-10-01), Kleuskens et al.
patent: 4536483 (1985-08-01), Sasaki et al.
patent: 4618593 (1986-10-01), Sasaki et al.
Patent Abstracts of Japan, vol. 8, No. 260, Nov. 29, 1984, JP 59-139938.
Translation (English) of Claims of JPA No. 59139938.

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