Process for the production of oxides

Details Process for the production of oxides Process for the production of oxides

1989-07-06

1991-02-05

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

049906321

ABSTRACT:
An improved process is provided for the production of oxides from hydrocarbons by reaction with oxygen, air or a gas enriched in oxygen relative to air, preferably the latter, in the presence of an oxidation catalyst. An alkane, e.g. propane, is converted to an alkene in a dehydrogenator. The product stream is introduced into an oxidation reactor. The product formed therein is recovered in a quench tower. The gas phase from the quench tower is treated in a PSA unit to form a gaseous stream containing the unreacted alkane, alkene, a minor amount of oxygen, i.e. less than about 2 percent by volume, 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 on the PSA unit, is introduced into a selective oxidation unit to remove the remaining oxygen and then recycled to the dehydrogenator. Hydrogen may be introduced into or removed from the PSA effluent, depending on the function of the adsorbent therein, to obtain an optimum concentration for introduction into the dehydrogenator. A preferred PSA system for use in the subject process comprises two parallel PSA units containing differnt adsorbents such that the gaseous stream formed in one PSA unit contians all of the hydrogen from the gas phase of the quench tower. The feed to the PSA units is divided disaproportionately so that the combined PSA effluent recycle streams contain the optimum concentration of hydrogen for the dehydrogenator.

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patent: 4870201 (1989-09-01), Ramachandran et al.
Solomons, "Organic Chemistry", p. 212, 2nd ed., (1978), John Wiley & Sons.

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