A singlet oxygen scavenger includes, as an active component, hexyl diethyl amino hydroxy benzoyl benzoate, 1-(4-methoxy phenyl)-3-(4-tert-butyl phenyl)-1, 3-propanedione, terephthalylidene-3, 3′-dicamphor-10, 10′-disulfonate, 2-ethyl hexyl 4-methoxy cinnamate, or 2-ethyl hexyl 2-cyano-3, 3-diphenyl acrylate; or 2-phenyl benzimidazole-5-sulfonic acid, 4, 4′, 4″-[(1, 3, 5-triazine-2, 4, 6-triyl) tris (imino)] trisbenzoic acid tris (2-ethyl hexyl), octyl salicylate, or 3, 3, 5-trimethyl cyclohexyl salicylate; or 2-hydroxy-4-methoxy-5-(sodiooxysulfonyl) benzophenone, drometrizol trisiloxane, 2-hydroxy-4-methoxy benzophenone, or 4-methyl benzylidene camphor.

The present invention provides: a rust inhibitor that has excellent rust inhibiting and anti-corrosive properties, not only on iron members, but also on non-iron metal members, and can prevent rust, and corrosion over long periods; a rust, inhibitor composition that, contains the rust inhibitor, a coating formation material; a coating obtained from the rust inhibitor, the rust inhibitor composition, or the coating formation material; and a metal component that comprises the coating. This rust inhibitor contains at least one compound represented by a Chemical Formula (1).

##STR00001## (In the formula: R.sup.1 is a hydrogen atom or an aliphatic hydrocarbon group with a carbon number of 1-33; R.sup.2 is an aliphatic hydrocarbon group with a carbon number of 1-33; the total carbon number of R.sup.1 and R.sup.2 is 1-34; X is a single bond or an aliphatic: hydrocarbon group with a carbon number of 1-5; either A.sup.1 or A.sup.2 is —OH; and the other is —O—CH.sub.2—CH(OH)—CH.sub.2OH or —O—CH(—CH.sub.2—OH).sub.2.)

The present invention provides: a rust inhibitor that has excellent rust inhibiting and anti-corrosive properties, not only on iron members, but also on non-iron metal members, and can prevent rust, and corrosion over long periods; a rust, inhibitor composition that, contains the rust inhibitor, a coating formation material; a coating obtained from the rust inhibitor, the rust inhibitor composition, or the coating formation material; and a metal component that comprises the coating. This rust inhibitor contains at least one compound represented by a Chemical Formula (1).

##STR00001## (In the formula: R.sup.1 is a hydrogen atom or an aliphatic hydrocarbon group with a carbon number of 1-33; R.sup.2 is an aliphatic hydrocarbon group with a carbon number of 1-33; the total carbon number of R.sup.1 and R.sup.2 is 1-34; X is a single bond or an aliphatic: hydrocarbon group with a carbon number of 1-5; either A.sup.1 or A.sup.2 is —OH; and the other is —O—CH.sub.2—CH(OH)—CH.sub.2OH or —O—CH(—CH.sub.2—OH).sub.2.)

The invention provides a product for inhibiting corrosion in a closed loop industrial water system containing a corrosion sensitive metal, the product comprising: a carboxylic acid-based corrosion inhibitor, an azole-based corrosion inhibitor, a nitrate-based corrosion inhibitor, and water. The invention also provides a method of inhibiting corrosion of a corrosion sensitive metal in a closed loop industrial water system, the method comprising treating water in the system with product of the invention, to provide treated water.

The invention provides a product for inhibiting corrosion in a closed loop industrial water system containing a corrosion sensitive metal, the product comprising: a carboxylic acid-based corrosion inhibitor, an azole-based corrosion inhibitor, a nitrate-based corrosion inhibitor, and water. The invention also provides a method of inhibiting corrosion of a corrosion sensitive metal in a closed loop industrial water system, the method comprising treating water in the system with product of the invention, to provide treated water.

A heat transfer circuit that includes a main flow path for a working fluid that extends through a compressor, a condenser, an expander, and an evaporator. The working fluid includes CF.sub.3I. The heat transfer circuit also includes an additive stream configured to supply additive for the CF.sub.3I to the working fluid in the main flow path based on a discharge temperature of the compressor. A method for operating a heat transfer circuit that includes directing a working fluid including CF.sub.3I through a main flow path of the heat transfer circuit. The method also includes changing a concentration of additive for the CF.sub.3I based on a discharge temperature of the working fluid from the compressor.

A heat transfer circuit that includes a main flow path for a working fluid that extends through a compressor, a condenser, an expander, and an evaporator. The working fluid includes CF.sub.3I. The heat transfer circuit also includes an additive stream configured to supply additive for the CF.sub.3I to the working fluid in the main flow path based on a discharge temperature of the compressor. A method for operating a heat transfer circuit that includes directing a working fluid including CF.sub.3I through a main flow path of the heat transfer circuit. The method also includes changing a concentration of additive for the CF.sub.3I based on a discharge temperature of the working fluid from the compressor.

The present invention relates to fuel derived from renewable resources. More specifically, the present invention provides a composition which can be used as a fuel and a mixture which can be added to one or more C.sub.8-22 fatty acid triglycerides in order to provide a fuel. In particular, the present invention concerns the reduction of decomposition of such fuels due to bacterial growth and oxidation.

The present invention relates to fuel derived from renewable resources. More specifically, the present invention provides a composition which can be used as a fuel and a mixture which can be added to one or more C.sub.8-22 fatty acid triglycerides in order to provide a fuel. In particular, the present invention concerns the reduction of decomposition of such fuels due to bacterial growth and oxidation.

Corrosion inhibitors and methods for reducing or inhibiting corrosion of metals in aqueous systems are provided. Corrosion inhibitor compositions may include tetracarboxylic acids, such as butane tetracarboxylic acid. The compositions may include other components, such as zinc, molybdate, silicate, cerium, among others. The compositions may also include polymers or oligomers. The corrosion inhibitor compositions produced synergistic results and unexpectedly low corrosion rates.