Texaco Inc.

Other

Texaco Development Corporation

Texaco Services (Europe) Ltd.

Jean-Pierre Leopold Maes

Serge S Lievens

Peter Roose

Filip Van Kenhove

Jurgen P De Kimpe

Walter A Van Neste

Steven Poppe

An aqueous heat transfer fluid comprising a Ccarboxylate freezing point depressant, either solely or in combination with C-Ccarboxylate freezing point depressants, in combination with C-Corganic acid salt corrosion inhibitors, provides an antifreeze/coolant composition wherein the corrosion inhibitors exhibit uniquely enhanced solubility, especially at low temperatures, in synergistic combination with the selected carboxylate freezing point depressants.

Potassium propionates for use as freezing point depressants and corrosion protection in heat transfer fluids

The application of carboxylate salts for storing thermal energy is disclosed. The invention is directed to methods for the storage and use of thermal energy comprising contacting mixtures of alkali metal salts or alkali earth metal salts of carboxylic acids, storing the thermal energy in the mixture, containing the mixture in a suitable heat exchange system and using the stored thermal energy in the heat exchange system.

Carboxylate salts in heat-storage applications

The invention relates to a method for cooling an electrical system comprising circulating in a cooling system of the electrical system a mixture comprising a heat transfer fluid and one or more carboxylic acid salts thereof, wherein the electrical conductivity of the mixture is less than 100 &#x3bc;S/cm.

Methods for fuel cell coolant systems

An aqueous fluid composition having a C -C carboxylic acid salt and a C -C carboxylic acid salt is used as a heat transfer fluid that provides improved heat transfer properties and improved corrosion protection. Such properties are desired for fluids used as an antifreeze coolant in automotive engines. The addition of a C -C carboxylic acid further improves corrosion protection. The addition of hydrocarbyl triazoles or thiazoles also further improves corrosion protection. One specific embodiment of the present invention includes a solution of potassium formate, sodium propanoate, and sodium heptanoate in a weight ratio of 20:20:5, respectively, where the pH of the solution is between 8 and 9.5.

Synergistic combinations of carboxylates for use as freezing point depressants and corrosion inhibitors in heat transfer fluids

Corrosion protection of magnesium and aluminum alloys in engine coolants and heat-exchange fluids is achieved by the use of a select group of aliphatic and aromatic carboxylate acids or the alkaline metal, ammonium or amine salts thereof in combination with a fluoride and/or a fluorocarboxylic acid or salt thereof. These compositions have been found to significantly improve the high temperature magnesium corrosion protection properties of coolants, and are of use in automobile engine coolant systems.

Corrosion inhibitors and synergistic inhibitor combinations for the protection of light metals in heat-transfer fluids and engine coolants

A test method and apparatus for determining the content of carboxylic acid-based corrosion inhibitors in a coolant or heat exchange fluid. The amount of acidic reagent added to the coolant or fluid between two pH equilibrium points is measured to determine the amount of inhibitors. The refractive index can be measured to determine the amount of freezing point depressant.

Field test apparatus and method for analysis of coolants and heat-exchange fluids

Field test apparatus for analysis of coolants and heat-exchange fluids

Antifreeze concentrate is disclosed having water soluble liquid alcohol freezing point depressant and corrosion inhibitor comprising carboxylic acids or their salts and a triazole compound, wherein the concentrate contains: (1) C.sub.5 -C.sub.16 aliphatic monobasic acid or the alkali metal, ammonium or amine salt thereof; (2) hydrocarbyl triazole; and (3) imidazole.

Growing community of inventors

Merelbeke, Belgium

Jean-Pierre Leopold Maes