Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Patent
1988-07-06
1989-07-18
Brust, Joseph Paul
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
558320, C07C12014
Patent
active
048495379
ABSTRACT:
An improved process is provided for the production of nitriles from hydrocarbons by reaction with oxygen, air or gas-enriched in relative to an air, and ammonia, in the presence of an ammoxidation catalyst. An alkane, e.g. propane, is converted to an alkene in a multistage dehydrogenator. The product stream is withdrawn from a reactor in the dehydrogenator other than the first and the last reactor and introduced into an ammoxidation reactor. The product is recovered in a conventional quench tower. The gaseous effluent from the quench tower is treated in a pressure swing adsorption unit to form a gas stream containing the unreacted alkane and alkene as well as a minor amount of oxygen. The gas stream, which may or may not contain hydrogen depending on the absorbent in the pressure swing adsorption unit, is introduced into the reactor in the dehydrogenator following that from which the product stream was withdrawn. The effluent from the last reactor in the dehydrogenator is introduced into: the first reactor; an intermediate reactor wherein the alkene concentration closely approximates the effluent or the ammoxidation reactor. The subject process is particularly efficient utilizing oxygen-enriched air in the reactor feed. A particularly preferred pressure swing adsorption system for use in the subject process comprises two parallel pressure swing adsorption units containing different adsorbents such that the gas stream formed in one contains all of the hydrogen in the gas phase from the quench tower. The feed to the pressure swing adsorption units is divided disproportionately so that the conbined pressure swing adsorption effluent recycle streams contain the optimum concentration of hydrogen for the dehydrogenator.
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Maclean Donald L.
Ramachandran Ramakrishnan
Satchell, Jr. Donald P.
Brust Joseph Paul
Cassett Larry R.
Nemetz Carol A.
Swope R. Hain
The BOC Group Inc.
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