William C Swift

US Patent:

56973071, Dec 16, 1997

Filed:

Dec 4, 1995

Appl. No.:

8/522369

Inventors:

Paul A. Nelson - Wheaton IL
William M. Swift - Downers Grove IL

Assignee:

The University of Chicago - Chicago IL

International Classification:

F23J 1100

US Classification:

110345

Abstract:

A process for treating organic waste materials without venting gaseous emissions to the atmosphere which includes oxidizing the organic waste materials at an elevated temperature not less than about 500. degree. C. with a gas having an oxygen content in the range of from about 20% to about 70% to produce an oxidation product containing CO. sub. 2 gas. The gas is then filtered to remove particulates, and then contacted with an aqueous absorbent solution of alkali metal carbonates or alkanolamines to absorb a portion of the CO. sub. 2 gas from the particulate-free oxidation product. The CO. sub. 2 absorbent is thereafter separated for further processing. A process and system are also disclosed in which the waste materials are contacted with a reactive medium such as lime and product treatment as described.

US Patent:

53356098, Aug 9, 1994

Filed:

Apr 29, 1993

Appl. No.:

8/055360

Inventors:

Paul A. Nelson - Wheaton IL
William M. Swift - Downers Grove IL

Assignee:

University of Chicago - Chicago IL

International Classification:

F23G 500

US Classification:

110346

Abstract:

A process and system for treating organic waste materials without venting gaseous emissions to the atmosphere. A fluidized bed including lime particles is operated at a temperature of at least 500. degree. C. by blowing gas having 20%/70% oxygen upwardly through the bed particles at a rate sufficient to fluidize same. A toxic organic waste material is fed into the fluidized bed where the organic waste material reacts with the lime forming CaCO. sub. 3. The off gases are filtered and cooled to condense water which is separated. A portion of the calcium carbonate formed during operation of the fluidized bed is replaced with lime particles. The off gases from the fluidized bed after drying are recirculated until the toxic organic waste material in the bed is destroyed.