Treatment of iron sulphide deposits

Details Treatment of iron sulphide deposits Treatment of iron sulphide deposits

2005-08-09

2005-08-09

Hruskoci, Peter A. (Department: 1724)

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

C134S003000, C134S041000, C166S244100, C252S180000, C252S181000, C422S015000

Reexamination Certificate

active

06926836

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.

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patent: WO 00/21892 A (2000-04-01), None

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