Ronald D Christensen

US Patent:

54240328, Jun 13, 1995

Filed:

Dec 13, 1993

Appl. No.:

8/166278

Inventors:

Ronald J. Christensen - Montgomery OH
Gary L. Baker - Augusta ME
Lyle H. Steimel - Forest Park OH

Assignee:

Diversey Corporation - Mississauga

International Classification:

C23F 1108

US Classification:

422 14

Abstract:

Water in a process water system, such as a cooling tower or pulp and paper processing plant, is treated to destroy biological microorganisms by diverting the portion of the water flowing through the system to a side stream. In the side stream, chemicals are added such as halide ions or sodium chlorite. The water is then passed through an electrolysis unit or a UV radiation unit to oxidize the precursor to form an active oxidant. Advantageously, the pH of the side stream can be lowered to significantly improve the oxidization of the halide ions. When a very small portion of the flow rate is passing through the side stream, the acid added does not significantly alter the pH of the entire system. In a preferred embodiment, the acid added is phosphonic acid which acts as an antiscalant. Also included in the present invention is a method to inject oxidant precursors into a process water system through an oxidant generation station.

US Patent:

48745413, Oct 17, 1989

Filed:

Jun 10, 1988

Appl. No.:

7/204861

Inventors:

Lyle H. Steimel - Forest Park OH
Ronald J. Christensen - Montgomery OH

Assignee:

DuBois Chemicals, Inc. - Cincinnati OH

International Classification:

C02F 512

US Classification:

252178

Abstract:

An all in one boiler water treatment composition includes an oxygen scavenging system, an alkalinity control agent such as sodium carbonate, diethylaminoethanol as a condensate treatment, a polymer system including polymethacrylate or polyacrylate and polymaleic acid along with an oxygen scavenging system. The oxygen scavenging system includes the diethylaminoethanol, a polyhydroxy acid and a sulfite.

US Patent:

51206617, Jun 9, 1992

Filed:

Feb 23, 1990

Appl. No.:

7/485867

Inventors:

Gary L. Baker - Alexandria KY
Ronald J. Christensen - Montgomery OH

Assignee:

Diversey Corporation - Mississauga

International Classification:

G01N 2100

US Classification:

436164

Abstract:

An inert water soluble dye is added to a concentrated water treatment composition. This mixture is added to the water in a circulating water system such as a cooling tower. The concentration of the dye and the concentration of the actives in the treatment composition are proportionate to each other. The concentration of the treatment composition in the water system can be determined by measuring the percentage of light absorbed by the dye in the water. This can be determined by use of a colorimeter. Fluorescein is the preferred dye.

US Patent:

47818433, Nov 1, 1988

Filed:

Dec 11, 1987

Appl. No.:

7/131902

Inventors:

Gary L. Baker - Alexandria KY
Ronald J. Christensen - Montgomery OH

Assignee:

DuBois Chemicals, Inc. - Cincinnati OH

International Classification:

C02F 150

US Classification:

210764

Abstract:

Algae growth in an open water system such as a water cooling tower is controlled by reducing the amount of light available for the algae to photosynthesize. The light available for photosynthesis is reduced by incorporating a dye into the water in the water cooling system. Thus the dye absorbs the light necessary for photosynthesis and in turn prevents algae growth. Preferably fluorescein at a concentration of 0. 2 to 800 parts per million is incorporated into the water in the water cooling system. Other dyes can be selected depending on the particular algae.

US Patent:

47190833, Jan 12, 1988

Filed:

Feb 9, 1987

Appl. No.:

7/012604

Inventors:

Gary L. Baker - Covington KY
Ronald J. Christensen - Montgomery OH

Assignee:

Chemed Corporation - Cincinnati OH

International Classification:

C23F 1116
C23F 1114

US Classification:

422 15

Abstract:

An all-in-one treatment composition for a water cooling tower includes a water soluble aromatic azole corrosion inhibitor such as benzotriazole, an organophosphorous antiscalant and a polymeric quaternary ammonium compound. The polymeric quaternary ammonium compound has the following general formula: ##STR1## The composition is suitable for use at low level continuous applications rates. The polymeric quaternary ammonium compound is also suitable for use at low concentration as a continuous biocide/biostat. This compound does not suffer from the acclimatization typically encountered when one biocide is used on a continuous low level basis.

US Patent:

48911410, Jan 2, 1990

Filed:

Dec 11, 1987

Appl. No.:

7/131754

Inventors:

Ronald J. Christensen - Montgomery OH
Lyle H. Steimel - Forest Park OH

Assignee:

DuBois Chemicals, Inc. - Cincinnati OH

International Classification:

C02F 120
C23F 1114

US Classification:

210750

Abstract:

An oxygen scavenger for boiler water includes ascorbic acid neutralized with diethylaminoethanol. The diethylaminoethanol provides condensate treatment for the long and short steam lines and improves the scavenging of the ascorbic acid.