Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1989-07-06
1991-04-16
Brust, Joseph Paul
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
549534, 549535, 549536, 568411, 568475, 585654, 585659, C07D30104, C07D30108, C07D30110
Patent
active
050084127
ABSTRACT:
An improved process is provided for the production of oxides from alkanes by reaction with oxygen, air or a gas enriched in oxygen relative to an air in the presence of an oxidation catalyst. An alkane, e.g. propane, is converted to an alkene in a multistage dehydrogenator. The product stream is withdrawn from an intermediate reactor in the dehydrogenator, other than the first and the last reactor, and introduced into an oxidation reactor. The product formed in the oxidation reactor is recovered in a conventional quench tower. The gaseous effluent from the quench tower is treated in a pressure swing adsorption (PSA) unit to form a gaseous stream containing the unreacted alkane and alkene as well as a minor amount, i.e. less than about 2 percent by volume, of oxygen and nitrogen, if present in the feed to the oxidation reactor. The gaseous stream, which may or may not contain hydrogen depending on the adsorbent in the PSA unit, is introduced into the reactor in the dehydrogenator following the intermediate reactor. The effluent from the last reactor in the dehydrogenator is introduced into either: (i) the first reactor; (ii) a reactor other than said first reactor wherein the alkene concentration closely approximates the effluent of the oxidation reactor. The subject process is particularly efficient utilizing oxygen-enriched air in the reactor feed. A preferred PSA system for use in the subject process comprises two parallel PSA units containing different adsorbents such that the gaseous phase formed in one contains all of the hydrogen in the gas phase from the quench tower. The feed to the PSA units is divided disproportionately so that the combined PSA 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
Nemetz Carol A.
Pearlman Robert I.
The BOC Group Inc.
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