Per- and polyfluoroalkyl substances (PFAS) are destroyed by oxidation in supercritical conditions. PFAS in water is concentrated in a reverse osmosis step and salt from the resulting solution is removed in supercritical conditions prior to destruction of PFAS in supercritical conditions.

A protectant composition including at least two of the following:(a) a biochelant; (b) a chelant; (c) an acid; (d) a scale inhibitor; (e) a corrosion inhibitor; (f) an antiprecipitation additive; (g) a soluble phosphorous compound; and (h) solvent. A method for reducing the amount of ferric ion in a produced water, the method including preparing a protectant composition comprising a scale inhibitor; a biochelant; and a solvent; and introducing the composition to a produced water. A method of mitigating the formation of calcium phosphate precipitant, the method including preparing a composition including a biochelant; a soluble phosphorous compound; an antiprecipitation additive; and a solvent; and introducing the composition to a feed water disposed in a fluid conduit.

A protectant composition including at least two of the following:(a) a biochelant; (b) a chelant; (c) an acid; (d) a scale inhibitor; (e) a corrosion inhibitor; (f) an antiprecipitation additive; (g) a soluble phosphorous compound; and (h) solvent. A method for reducing the amount of ferric ion in a produced water, the method including preparing a protectant composition comprising a scale inhibitor; a biochelant; and a solvent; and introducing the composition to a produced water. A method of mitigating the formation of calcium phosphate precipitant, the method including preparing a composition including a biochelant; a soluble phosphorous compound; an antiprecipitation additive; and a solvent; and introducing the composition to a feed water disposed in a fluid conduit.

A composition and method of inhibiting corrosion and white rust on metal components in a water system. The composition preferably comprises an amino-acid based polymer (most preferably a polyaspartic acid or a salt thereof), hydroxyphosphonoacetic acid, and a second phosphonic acid (preferably a phosphonocarboxylic acid), and does not require the use of regulated metals. The composition is effective even in the presence of biocides. A preferred method of inhibiting white rust comprises adding an amino-acid based polymer or hydroxyphosphonoacetic acid or both to the water system. A preferred method of inhibiting corrosion or white rust comprises adding an amino-acid based polymer, hydroxyphosphonoacetic acid, and a phosphonocarboxylic acid to the water system. Preferably the active concentrations are at least 3 ppm each of the amino-acid based polymer and hydroxyphosphonoacetic acid when added to a volume of water in the water system.

A composition and method of inhibiting corrosion and white rust on metal components in a water system. The composition preferably comprises an amino-acid based polymer (most preferably a polyaspartic acid or a salt thereof), hydroxyphosphonoacetic acid, and a second phosphonic acid (preferably a phosphonocarboxylic acid), and does not require the use of regulated metals. The composition is effective even in the presence of biocides. A preferred method of inhibiting white rust comprises adding an amino-acid based polymer or hydroxyphosphonoacetic acid or both to the water system. A preferred method of inhibiting corrosion or white rust comprises adding an amino-acid based polymer, hydroxyphosphonoacetic acid, and a phosphonocarboxylic acid to the water system. Preferably the active concentrations are at least 3 ppm each of the amino-acid based polymer and hydroxyphosphonoacetic acid when added to a volume of water in the water system.

A composition comprising a) a quaternary trialkylalkanolamine hydroxide and b) at least one diamine as component b), which is selected from the group consisting of 1-amino-4-methylpiperazine, 1,2-diaminopropane and mixtures thereof.

A composition comprising a) a quaternary trialkylalkanolamine hydroxide and b) at least one diamine as component b), which is selected from the group consisting of 1-amino-4-methylpiperazine, 1,2-diaminopropane and mixtures thereof.

A scale inhibitor composition for reducing calcium scale under stressed conditions is disclosed. The composition comprises an aqueous polymerization reaction product of an acrylic acid and a chain transfer agent, the reaction product comprising a low-molecular weight acrylic acid polymer having a weight averaged molecular weight (Mw) of from about 1,300 to about 15,000 Daltons. A method of preparing the scale inhibitor composition is also disclosed, and comprises reacting the acrylic acid and the chain transfer agent to give the reaction product comprising the acrylic acid polymer. A process for ameliorating calcite scale in a mining operation is further disclosed. The process comprises adding the scale inhibitor composition to process water comprising at least one stressed scaling condition.

Disclosed are oleyl propylenediamine-based compounds used in compositions and methods for inhibiting corrosion. The method comprises introducing into a fluid source a composition comprising one or more oleyl propylenediamine-based compounds comprising Formula I:

##STR00001##

wherein Y.sub.1, Y.sub.2, and Y.sub.3 independently are hydrogen or a substituent of Formula (II):

##STR00002##

wherein V is —O— or —NH—, W is optionally present and is a linear or branched C.sub.1-10 aliphatic group, X is —H, —NZ.sub.3.sup.+, —COOH, —SO.sub.3H, —OSO.sub.3H.sub.2, —PO.sub.3H, —OPO.sub.3H.sub.2, or a salt thereof, each Z independently is hydrogen or a linear or branched C.sub.1-20 aliphatic group optionally interrupted or substituted with one or more oxygen atoms, and R is hydrogen or methyl, provided that at least one of Y.sub.1, Y.sub.2, or Y.sub.3 is a substituent of Formula (II).

Disclosed are oleyl propylenediamine-based compounds used in compositions and methods for inhibiting corrosion. The method comprises introducing into a fluid source a composition comprising one or more oleyl propylenediamine-based compounds comprising Formula I:

##STR00001##

wherein Y.sub.1, Y.sub.2, and Y.sub.3 independently are hydrogen or a substituent of Formula (II):

##STR00002##

wherein V is —O— or —NH—, W is optionally present and is a linear or branched C.sub.1-10 aliphatic group, X is —H, —NZ.sub.3.sup.+, —COOH, —SO.sub.3H, —OSO.sub.3H.sub.2, —PO.sub.3H, —OPO.sub.3H.sub.2, or a salt thereof, each Z independently is hydrogen or a linear or branched C.sub.1-20 aliphatic group optionally interrupted or substituted with one or more oxygen atoms, and R is hydrogen or methyl, provided that at least one of Y.sub.1, Y.sub.2, or Y.sub.3 is a substituent of Formula (II).