Disclosed herein are polymer compositions useful for inhibiting corrosion of metal surfaces in industrial process water recirculating systems. The polymer compositions include interpolymers of about 90 mol % to about 97 mol % of a first monomer, about 0.01 mol % to about 5 mol % of a second monomer that is chemically different from the first monomer, and about 0.01 mol % to about 5 mol % of a third monomer that is chemically different from the first and second monomers; and optionally a fourth monomer that is chemically different from the first, second, and third monomers. About 0.05 ppm to about 200 ppm by weight of the polymer composition is dispersed in an industrial process water source, optionally in the presence of a divalent or higher valency metal ion. The dispersed polymer compositions significantly reduce the corrosion rate of metal surfaces of industrial equipment, even after one or more cycles of concentration.

The present disclosure provides an improved scale inhibiting formulation that is effective, environmentally friendly, and does not add any organic compounds or traditional polymeric compounds to treated water. The scale inhibiting composition includes molecular clusters of polyammonium bisulfate (PABS), which can interact physically, chemically, or physio-chemically with one or more ions in the water or water-containing system being treated. That interaction inhibits scale accretion and/or removes previously formed scale.

The present invention discloses a polymer and a comprehensive antiscalant formulation prepared from the same polymer and including dealkalizer, chelating agent, oxidizing biocide, non-oxidising biocide, and use of the said antiscaling formulation to inhibit the scale formation in industrial water systems. The said polymer is the reaction product of an MA-AA copolymer and one of compounds selected from an ethyleneamines, morpholine, or alkanolamines at a reaction temperature 50-80 C. for 1-3 hours. The said antiscaling formulation includes the components; the polymer in 5-100 ppm, the dealkalizer in 5-200 ppm, the chelating agent in 5-100 ppm, and the biocide in 2-20 ppm. The said antiscaling formulation further featured with corrosion inhibition and biocidal activity.

A phosphorus-free corrosion and scale inhibitor used in circulating cooling water of central air conditioning is provided, which contains tourmaline, green corrosion and scale inhibitor, zinc salt and the like, wherein the content of the tourmaline is 5-500 g/t (calculated based on solid form); the content of the green corrosion and scale inhibitor is 5-50 g/t (calculated based on liquid form); and the content of the zinc salt is 0.2-0.8 g/t (calculated based on solid form), wherein the tourmaline includes dravite, schorlite, elbaite, manganese tourmaline, uvite or the like. The green corrosion and scale inhibitor contains any one, or two or three of polyaspartic acid, polyepoxysuccinic acid and polymaleic acid. Copper corrosion can be effectively inhibited by adding 0.2-2 g/t of benzotriazole (calculated based on solid form) into copper-containing devices. Also disclosed is a method of preparing the phosphorous-free corrosion and scale inhibitor used in circulating cooling water of central air conditioning.

A terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning, containing tourmaline, polyaspartic acid, polyepoxysuccinic acid, polymaleic acid, etidronic acid, zinc salt, and the like, wherein the content of the tourmaline is 5-500 g/t (calculated based on solid form); the content of polyaspartic acid, polyepoxysuccinic acid, polymaleic acid and etidronic acid is 2-60 g/t (calculated based on liquid form); and the content of the zinc salt is 0.2-0.8 g/t (calculated based on solid form), is provided. Also disclosed is a method of preparing the terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning.

The present invention discloses a descaling formulation consisting of dealkalizer, surfactant and corrosion inhibitor and use of the said descaling formulation to dissolve and clean scales formed on the surfaces of industrial water systems. The said dealkalizer is selected from a mineral acid, an organic acid or combination of them. The said surfactant is selected from a polymer surfactant, a zwitter ionic surfactant or non-ionic surfactant or combination of them. The said corrosion inhibitor is a quaternary ammonium salt or a Polyethylene glycol alkyl ether.

This invention relates to a composition, comprising a) at least one quaternary ammonium compound of the formula (I) wherein R is a C.sub.5 to C.sub.21 aliphatic hydrocarbon group, X is an anionic counter ion, and R.sup.a, R.sup.b are selected from the group consisting of hydrogen, methyl, ethyl, allyl, propyl, butyl, phenyl or benzyl residues, b) ammonium bisulfite or sodium bisulfite, c) glutaraldehyde or THPS, and d) at least one organic dye.

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The present disclosure relates to compositions including coagulants, testing methods and devices, and methods used in connection with lime softening processes, such as warm or hot lime softening processes. The compositions, devices, and methods disclosed herein may be used to improve sludge bed properties in lime softening processes, such as warm lime softening process or hot lime softening processes.