E.i. Dupont De Nemours and Company

Donald H Eastham

James W Reeves

Tze Chao

Ted M Knowlton

James V Tarbell

Melvyn B Pell

Foster W Rennie

The present invention is a process for feeding particulate material to a fluidized bed reactor operated at greater than atmospheric through a standpipe wherein the ratio of the absolute pressure where the standpipe enters the fluidized bed reactor to the absolute pressure where the particulate material enters the standpipe is at least about 1.5 and gas is injected into the standpipe at a velocity which is about 20-80 percent of the minimum fluidization velocity of the particulate material.

Process for injecting particulate material into a fluidized bed reactor

In a continuous process for reacting particulate ore with a liquid reagent in a counter-current vertical column the improvement comprising:

Continuous ore reaction process by fluidizing

The invention provides an improved method and apparatus for feeding solids to a fluidized bed reactor. A back pressure control valve regulates the pressure drop between the pressure above a solids column in a standpipe and the pressure in the reactor. Solids are fed from the standpipe via a conduit without valve means, the conduit contains a bend of an angle greater than the angle of repose of the solids.

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Victoria, TX, United States of America

Donald H Eastham