Compounds, compositions and methods are provided for reducing, inhibiting, or preventing corrosion of a surface, using a polyester polyamine compound. The polyester polyamine compound having a structure corresponding to Formula 1 or 2, or a salt thereof:

##STR00001##

wherein R.sub.1 is independently alkylene; R.sub.2 is independently hydrogen or —COR.sub.4; R.sub.3 is independently alkyl, alkenyl, aryl, or alkaryl; R.sub.4 is independently alkyl or alkenyl; R.sub.10 and R.sub.11 are each independently hydrogen, alkyl, or alkaryl; m is an integer from 1 to 10; n is an integer from 3 to 10; and wherein at least one R.sub.2 is —COR.sub.4.

Compositions and methods for inhibiting corrosion of metal surfaces are disclosed herein. Also disclosed are methods of manufacturing the corrosion inhibitors compositions. The corrosion inhibitor compositions include the reaction product of a dicarbonyl compound with thioglycolic acid. The compositions may include other components, such as a solvent, a hydrogen sulfide scavenger, or a biocide.

The present Invention relates to a new and novel process for treatment of wastewater that combines treatment methods that use Ballast Material (BM), Hydrothermal Carbonization (HTC), Hydrodynamic Cavitation (HDC), Probiotics (PB), acid, and Bio-Adsorbents (BA) to replace biological treatment of wastewater, specifically Activated Sludge Technology (AST).

Methods are provided to inhibit corrosion in low hardness water systems. The corrosion inhibiting treatment comprises: calcium salts of low molecular weight polymer polycarboxylic acids. These calcium salts may be added preformed to the water system in need of treatment or formed in-situ in the system. This method of corrosion inhibition is not a source of addition phosphorous or heavy metal to the treated system.

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.

Plasma discharges and electromagnetic fields may be applied to a liquid, such as water, for desalinization purposes and to treat unwanted material in the liquid.

Water treatment compositions useful to decrease surface tension of cooling tower waters are provided as are treated cooling tower waters. The compositions increase the transfer of heat from metal surfaces in contact with the treated cooling water. The increased heat transfer can decrease energy use, for example, in water-cooled HVAC and refrigeration compressors, and can enable increased production rates in many industrial processes, including, for example, plastics molding, metal billet production, petroleum refining, power plants, and condensers for steam turbines. Also provided are cooling tower water compositions formulated to control corrosion, scale, and deposition in a cooling tower and in treated cooling tower water.

This disclosure provides techniques for detecting and/or inhibiting corrosion of a distribution/recirculation network for a fluid, e.g., an aqueous matrix (liquid). For example, the disclosed techniques can be used to measure and/or predict degeneration of pipes, solder joints and various other plumbing fixtures in a water distribution network or heat transfer recirculation network caused as a function of variation in environmental parameters. In one embodiment, a system builds a database by measuring metal corrosion (e.g., from lead or copper pipe, solder joint or other type of plumbing vessel or fixture) and correlating degradation of a layer of protective scale and/or metal concentrations present with measured environmental parameters; later, as conditions vary, the database (or associated correlation weights/values) may be used to predict degradation of scale health and/or corrosion stemming from short and/or long term water conditions, and to effectuate advance mitigation.

A corrosion inhibitor for a central heating system is provided in the form of a cream having low water content, which may be encapsulated within a water-soluble film, for example a poly (vinyl alcohol) film. The corrosion inhibitor product is more highly-concentrated than known liquid inhibitors, and the encapsulation in a water soluble film provides for safer handling and eliminates waste from plastic packaging.