Robert G Gabriel

US Patent:

6926836, Aug 9, 2005

Filed:

Jan 16, 2003

Appl. No.:

10/345720

Inventors:

Stephen David Fidoe - Aberdeen, GB
Robert Eric Talbot - Staffordshire, GB
Christopher Raymond Jones - West Midlands, GB
Robert Gabriel - Mechanicsville VA, US

Assignee:

Rhodia Consumer Specialties Limited - Watford

International Classification:

C02F005/14

US Classification:

210700, 134 3, 134 41, 1662441, 252180, 252181, 422 15

Abstract:

Treating a water system containing or in contact with a metal sulphide scale to inhibit, prevent, reduce, dissolve or disperse iron sulphide deposits. A solution of tris(hydroxyorgano)phosphines (THP) and tetrakis(hydroxyorgano)phosphonium salts (THP salts) and sufficient of a chelant (amino-carboxylates or amino-phosphonates) to provide a solution containing from 0. 1 to 50% by weight of said THP or THP salt and from 0. 1 to 50% by weight of said chelant, is contacted with the metal sulphide scale thereby to dissolve at least part of said scale in said solution.

US Patent:

60632909, May 16, 2000

Filed:

Jan 25, 1999

Appl. No.:

9/237160

Inventors:

Brian K. Failon - Richmond VA
Robert G. Gabriel - Richmond VA

Assignee:

Albright & Wilson Americas Inc. - Glen Allen VA

International Classification:

C02F 514

US Classification:

210699

Abstract:

The present invention is a process of treating aqueous systems to prevent precipitation of dissolved metal ion species, for example, Ca, Mg, Ba, Cu, Fe, Mn and Zn. This has the effect of preventing scale and/or stain formation. The process involves introducing 0. 5 to 15000 ppm (or mg/liter) of a synergistic mixture of HEDP and DETPMP into the aqueous system to be treated.

US Patent:

60632895, May 16, 2000

Filed:

Oct 1, 1998

Appl. No.:

9/164811

Inventors:

Brian K. Failon - Richmond VA
Robert G. Gabriel - Richmond VA

Assignee:

Albright & Wilson Americas Inc. - Glen Allen VA

International Classification:

C02F 514

US Classification:

210699

Abstract:

The present invention is a process of treating aqueous systems to prevent precipitation of dissolved metal ion species, for example, Ca, Mg, Ba, Cu, Fe, Mn and Zn. This has the effect of preventing scale and/or stain formation. The process involves introducing 0. 5 to 100 ppm of a synergistic mixture of HEDP and DETPMP into the water system to be treated.