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This scale inhibitor uses steric dispersion principles

By Mary Page Bailey |

With the commercial release of a new scale inhibitor — called ScaleTreat FeS 13805 — researchers at Clariant Oil Services (Houston; www.clariant.com/oilinnovation), in collaboration with academia, have improved upon existing scale-treatment chemistries, adding a newly patented copolymer to the industry. This new chemistry, according to the company, allows ScaleTreat FeS to specifically inhibit the formation of iron sulfide (FeS) scale at threshold (low and non-stoichiometric) concentrations. Other inhibitor methods (such as organic acids, chelating agents and acrolein) must be dosed at stoichiometric (molar) concentrations and, therefore, at a much higher concentration, which is relatively inefficient and may introduce health and safety risks. “The suggested reaction mechanism for ScaleTreat FeS (diagram) involves the amide bonds in the copolymer seeding into the metal sulfide crystals via electrostatic interaction,” explains research scientist Jonathan Wylde. “As the metal (M) sulfide (S) crystals grow within the confines of the three-dimensional polymer shape, they experience steric resistance, limiting their size and changing their morphology.” The copolymer’s architecture is key to this inhibition technique. Unlike…
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