Process for low ammonia operation of the nitrile synthesis

Details Process for low ammonia operation of the nitrile synthesis Process for low ammonia operation of the nitrile synthesis

1974-08-26

1976-05-25

Brust, Joseph P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

23230R, 23232R, 23232C, 23254R, 73 23, C07C12000

Patent

active

039593410

ABSTRACT:
The synthesis of nitriles such as acrylonitrile by the ammoxidation of mixtures of an olefin such as propylene or isobutylene, ammonia and oxygen or air is operated out low molar feed ratios of ammonia: olefin in the range of 1.03 to 1.07:1 and high excess oxygen levels of 4 to 7 mol % in the reactor effluent gases without significant losses in nitrile yield or significantly increased levels of oxygenated by-products. Control under such conditions is effected by analyzing the reactor effluent gases, previously temperature-conditioned at 350.degree. to 450.degree. F and solids removed, by a mass spectrometer instrument operating in a closed gas sampling and conditioning circuit or loop outside the reactor, and adjucting the input feed gas mixture in response to said effluent gas analysis to maintain the prescribed low ammonia rate in the feed and the excess oxygen level in the effluent gases leaving the reactor. Material savings in ammonia are effected and also in the amount of sulfuric acid required to remove unreacted ammonia from the residual gases before release of same to the atmosphere.

REFERENCES:
patent: 2955457 (1960-10-01), Peters et al.
patent: 3200141 (1965-08-01), Milberger
patent: 3230246 (1966-01-01), Callahan et al.
patent: 3431292 (1969-03-01), Callahan et al.
patent: 3512393 (1970-05-01), Weiss
patent: 3529937 (1970-09-01), Ihara et al.
patent: 3589171 (1971-06-01), Haley
patent: 3673854 (1972-07-01), Manka

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