Leonard D Dubin

US Patent:

52771350, Jan 11, 1994

Filed:

Nov 23, 1992

Appl. No.:

7/980600

Inventors:

Leonard Dubin - Skokie IL
John E. Hoots - St. Charles IL

Assignee:

Nalco Chemical Company - Naperville IL
Nalco Fuel Tech - Naperville IL

International Classification:

F23J 1500

US Classification:

110345

Abstract:

In a furnace (boiler) installation where oxides of nitrogen are to be reduced to elemental nitrogen by treatment with a reactant such as a solution of urea, the desired amount of reactant (dependent on furnace specifics) is determined by comparing the fluorescent light intensity of a sample of the treating solution to the fluorescent light intensity of a calibration standard representing the desired amount of reactant concentration; in the case of non-comparison the concentration of reactant in the treating solution is altered until the intensities are substantially identical.

US Patent:

45841047, Apr 22, 1986

Filed:

Jun 29, 1984

Appl. No.:

6/626348

Inventors:

Leonard Dubin - Skokie IL

Assignee:

Nalco Chemical Company - Oakbrook IL

International Classification:

C02F 508

US Classification:

210696

Abstract:

A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters containing dissolved silicates is disclosed. The method involves treating the industrial waters with a boron compound which dissolves in or hydrolyzes in these industrial waters to give the orthoborate ion. The preferred boron compound is boric acid, its salts, or precursors.

US Patent:

50374834, Aug 6, 1991

Filed:

Jan 30, 1990

Appl. No.:

7/472525

Inventors:

Leonard Dubin - Skokie IL

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

B08B 308

US Classification:

134 3

Abstract:

An iron oxide cleaning composition and method for using these compositions as disclosed. This cleaning process uses formaldehyde sulfoxylate reducing agents in combination with hydrolyzable tanning extracts and chelating agents to remove deposited iron oxide from metal surfaces, particularly those surfaces exposed to recirculating cooling waters.

US Patent:

46769102, Jun 30, 1987

Filed:

Aug 11, 1986

Appl. No.:

6/895079

Inventors:

Leonard Dubin - Skokie IL

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

C02F 508

US Classification:

210696

Abstract:

Concentrated solutions of sodium sulfite and related compounds can be inhibited against sodium sulfate precipitation by substituting potassium for a portion of the sodium contained in such compounds. A typical concentrate would contain a water-soluble sulfite mixture comprising sodium and potassium sulfite with the sodium to potassium ratio ranging between 1:1 to 15:1.

US Patent:

43614922, Nov 30, 1982

Filed:

Apr 9, 1981

Appl. No.:

6/252695

Inventors:

Leonard Dubin - Skokie IL

Assignee:

Nalco Chemical Company - Oak Brook IL

International Classification:

C02F 512

US Classification:

252175

Abstract:

A method of enhancing the activity of water-soluble, low molecular weight polymeric dispersants used to suspend iron oxides in cooling waters which also contain soluble iron compounds comprises treating such waters with the water-soluble, low molecular weight polymeric dispersant and a water-soluble copolymer consisting of 25% by weight of acrylic acid and 75% by weight acrylamide with the ratio of copolymer to soluble iron being 1:1.

US Patent:

54417139, Aug 15, 1995

Filed:

Oct 3, 1991

Appl. No.:

7/770857

Inventors:

Leonard Dubin - Skokie IL
W. Robert Epperly - New Canaan CT
Barry N. Sprague - Bethlehem CT
Thure von Harpe - Meerbusch, DE

Assignee:

Nalco Fuel Tech - Naperville IL

International Classification:

C01B 2100

US Classification:

423235

Abstract:

The tendency of aqueous solutions of urea and other NH-containing compositions to force instability of hardness factors has been found to be detrimental to processes and apparatus employing them. The reliability of these processes and apparatus is improved by the inclusion of hardness-suppressing compositions, which preferably include both a water-soluble polymer and a phosphonate. In particular, agricultural and NO. sub. x -reducing applications are improved, especially for solutions containing urea hydrolysis products and the salts of them.

US Patent:

56457561, Jul 8, 1997

Filed:

Jun 7, 1995

Appl. No.:

8/472468

Inventors:

Leonard Dubin - Skokie IL
W. Robert Epperly - New Canaan CT
Barry Normand Sprague - Bethlehem CT
Thure von Harpe - Meerbusch, DE

Assignee:

Nalco Fuel Tech - Naperville IL

International Classification:

C02F 510

US Classification:

252181

Abstract:

The tendency of aqueous solutions of urea and other NH-containing compositions to force instability of hardness factors has been found to be detrimental to processes and apparatus employing them. The reliability of these processes and apparatus is improved by the inclusion of hardness-suppressing compositions, which preferably include both a water-soluble polymer and a phosphonate. In particular, agricultural and NO. sub. x -reducing applications are improved, especially for solutions containing urea hydrolysis products and the salts of them.

US Patent:

52844927, Feb 8, 1994

Filed:

Oct 8, 1992

Appl. No.:

7/958567

Inventors:

Leonard Dubin - Skokie IL

Assignee:

Nalco Fuel Tech - Naperville IL

International Classification:

C10L 118

US Classification:

44301

Abstract:

An improved lubricity water and fuel oil emulsion is presented. The emulsion is used as fuel for an electric power generating turbine, and includes a lubricity additive selected from the group consisting of dimer acids, trimer acids, phosphate esters, sulfurized castor oil, and mixtures thereof. Also included is a method for improving the combustion efficiency of a turbine, using the inventive additives.