Praxair Technology, Inc.

I.q.f. Inc.

Donald Walter Kirkwood

Matthew Lincoln Wagner

Kazuo Kiyonaga

Bosko Milankov

George A Temple

This invention is directed towards an improved process for the selective gas phase oxidation of a organic reactant using a metal oxide redox catalyst, wherein the organic reactant and air feeds are at a substantially continuous level, the improvement comprising adding a fluctuating flow of oxygen at alternating relatively high and relatively low levels. The invention also teaches means by which a gas may be provided to a reaction process on a fluctuating basis.

Oxygen enrichment process for air based gas phase oxidations which use

Chilling or freezing a substance into small pellets is disclosed. A substance such as liquid egg falls gently from only a small height onto the surface (12) of liquid nitrogen. The discharge nozzle (13) is prevented from freezing up by a flow of ambient or heated air over it. The surface of the boiling nitrogen is kept smooth by imparting a velocity to the nitrogen with an impeller (20) or by running the nitrogen along a trough. The pellets are consistent as to final temperature, and the process is efficient as to nitrogen use. The process can be used with other thick, creamy substances.

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Oakville, Canada

Donald Walter Kirkwood