Scale inhibitors/sequestering agents

Similar chelating properties are exhibited by the following agents (see also Ref. 36) scale inhibitors, sequestering agents, water softeners, surfactants, peroxide. stabilizers, soil antiredeposition agents, well-drilling needs,- etc. 

Sequestering agents (also known as scale inhibitors or antisealants) are used to minimize the potential for forming scale on the surface of an RO membrane. Antisealants work by one of three methods ... 

Scale inhibitors or anti-sealants (A/S) are generally organic compounds containing sul-phonate, phosphonate, or carboxylic acid functional groups and chelating agents such as carbon, alum and zeolites that sequester and neutraUse a particular ion that may be formed. The majority of scale inhibitors can be classified as threshold inhibitors. In... 

Uses Sequestering agent, dispersant, scale inhibitor, and plasticizer used in water treatment applies. USDA approved as ingredient in boiler water treatment formulations for federally inspected meat and poultry processing food-pkg. adhesives. 

Chem. Descrip. 1-Hydroxyelhyl-1-dlphosphonlcacld Uses Temp -stable scale Inhibitor for oil field appllc. sequestering agent for calcium carbonate... 

Since pyromellitic acid sequesters heavy metals, it can also be used as an antiscaling agent(32) and as a corrosion inhibitor(33) but whether it has sufficient benefits for market applications has yet to be shewn. An unusual proposed use is to dissolve kidney stones(34). A related property is that pyromellitic acid will precipitate lanthanide ions frem solutions containing a number of divalent cations such as Mg, Ni, Mn, etc.(35). As a consequence, there may be possible applications for large scale purification of the rare earths. 

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