Patent · US Active

Method of water treatment

US9376650B2 · kind B2 · utility

1Cited by

8References

12Claims

0Family size

Assignee

ITALMATCH CHEMICALS S.P.A. · IT

Inventors

Patrick Notté · Wavre, BE
Tessa Johnson · Gijzegem, BE
Albert Devaux · Mont-Saint-Guibert, BE

Key dates

Filing date	Jan 21, 2009
Grant date	Jun 28, 2016
Priority date	—
Expiry date	Apr 20, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC11D3/365
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A method for securing the use of an aqueous medium under any substantial exclusion of metal ion interference is disclosed. A phosphonic acid compound containing: a selected phosphonate moiety and a moiety selected from a limited number of species; or hydrocarbon chains containing aminoalkylene phosphonic acid substituents; or alkylamino alkylene phosphonic acids containing an active moiety embodying N, O, and S. The technology can, by way of illustration, be used in numerous applications including secondary oil recovery, scale inhibition, industrial water treatment, paper pulp bleaching, dispersant treatment, sequestering application, brightness reversion avoidance and paper pulp treatment.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.