Patent ID: 8394287
Filing Date: 2013-03-12
Classification: C09K,C23F

Abstract:
1. A method for producing an ethylene glycol based non-aqueous heat transfer fluid having a reduced oral toxicity comprising the steps of: (a) providing a non-aqueous heat transfer fluid comprising ethylene glycol; (b) mixing a sufficient amount of non-aqueous propylene glycol with the non-aqueous heat transfer fluid comprising ethylene glycol to achieve a concentration of the propylene glycol that is between about 5 percent and 30 percent of the weight of the ethylene glycol and the propylene glycol in the resulting heat transfer fluid, wherein the resulting fluid is less toxic than 10,000 mg/kg on the basis of an acute LD (c) adding at least one corrosion inhibiting additive, wherein the corrosion inhibiting additive is soluble in both ethylene glycol and propylene glycol, wherein the resulting heat transfer fluid contains no additive that requires water in the heat transfer fluid to dissolve the additive or to enable the additive to function and wherein the resulting non-aqueous heat transfer fluid contains less than 0.5% by weight water.