Colin D Chriswell

48592129, Aug 22, 1989

Sep 15, 1988

7/244991

Colin D. Chriswell - Slater IA
Surender M. Kaushik - Socorro NM
Navin D. Shah - Houston TX
Richard Markuszewski - Ames IA

Iowa State University Research Foundation, Inc. - Ames IA

C10L 500

44622

Pretreatment of coal by devolatization at temperatures ranging from about 420. degree. C. to about 450. degree. C. for from about 10 minutes to about 30 minutes before leaching with molten caustic leads to a significant reduction in carbonate formation, greatly reducing the cost of cleaning coal on a per ton basis.

42776350, Jul 7, 1981

Jun 24, 1980

6/162524

Charles S. Oulman - Ames IA
Colin D. Chriswell - Slater IA

Iowa State University Research Foundation, Inc. - Ames IA

C07C 3108
C07C 2976

568916

Relatively dilute aqueous solutions of ethanol are concentrated by passage through a bed of a crystalline silica polymorph, such as silicalite, to adsorb the ethanol with residual dilute feed in contact with the bed, which is displaced by passing concentrated aqueous ethanol through the bed without displacing the adsorbed ethanol. A product concentrate is then obtained by removing the adsorbed ethanol from the bed together with at least a portion of the concentrated aqueous ethanol used as the displacer liquid. This process permits ethanol to be concentrated from dilute fermentation beers, which may contain from 6 to 10% ethanol, to obtain a concentrate product at very low energy cost having an ethanol concentration in excess of 95%, such as a concentration of from 98 to 99. 5%.

50247530, Jun 18, 1991

Oct 3, 1989

7/416710

Colin D. Chriswell - Slater IA
Richard Markuszewski - Ames IA
William H. Buttermore - Ames IA

Iowa State University Research Foundation, Inc. - Ames IA

B03B 1302

209 1

An improved material separation system and method utilizing control particles of generally known physical characteristics as tracer particles through the separation process. The control particles are generally the same or similar to the materials being separated and are coated with or bonded to a fluorescing dye. The control particles are mixed with the material to be separated prior to separation. The mixture is imposed with a energy source which excites the fluorescent dye causing fluorescing emission. The fluorescing emission is detected at the output of the separation of the mixture to determine if the separation is operating efficiently and as desired.

51814285, Jan 26, 1993

May 29, 1990

7/530903

Colin D. Chriswell - Slater IA

Iowa State University Research Foundation, Inc. - Ames IA

G01N 3324

7386312

A device for testing soil samples is comprised of a closed container having an interior compartment with upper and lower portions. A valve is provided for introducing into the closed container a liquid having the general properties of butane, and a second valve is provided in the container for allowing gas in the closed container to exit therefrom. A soil sample filter container is suspended within the container above the bottom portion thereof. A condensation element is mounted in the closed container and positioned above the filter container to cause gas evaporating from the liquid in the container to liquefy as condensate on the condensation element, whereupon the condensate drips into the filter container and leaches through a soil sample therein, and then collects as a liquid in the bottom portion of the closed container. This permits a hydrocarbon residue to be left in the bottom portion of the container after the outlet valve has been opened to permit the liquid to evaporate.

55057462, Apr 9, 1996

Mar 15, 1994

8/213976

Colin D. Chriswell - Slater IA
Josh A. O'Donnell - Huxley IA

Iowa State University Research Foundation, Inc. - Ames IA

C10L 900

44624

Methods and compositions are provided for treating coal to reduce the emissions of sulphur dioxide and hydrogen chloride gases upon combustion. In the subject method, coal is washed with a calcium anion wash solution, such as calcium hydroxide solution, and then separated from the wash solution. The treated coal exhibits reduced emissions of both sulphur dioxide and hydrogen chloride gas on combustion as compared with untreated coal.

54784522, Dec 26, 1995

Oct 28, 1994

8/331000

Colin D. Chriswell - Slater IA
John J. Richard - Ames IA

Iowa State University Research Foundation, Inc. - Ames IA

G01N 2726

2041532

Methods and apparatus for in sire isolation of volatile organic compounds from groundwater using electrolytically-generated purge gas are disclosed. One preferred method includes electrolytically generating a purge gas from the ground water, passing the purge gas through the groundwater (in situ) to purge volatile organic compounds from groundwater, collecting the purge gas along with the purged volatile organic compounds, and detecting (in situ) the presence and/or amount of purged volatile organic compounds in the purge gas. One preferred apparatus includes a generally cylindrical cell incorporating the necessary electrodes, one or more ionization sources and detectors.