GB1066333A - A method of inhibiting cavitation in high speed diesel engines - Google Patents

Abstract

Cavitation in high speed diesel engine cooling systems is inhibited by circulating a cooling liquid comprising (a) water or an aqueous solution of a member of the group consisting of non-polymerized saturated aliphatic alcohols completely mixible in water in all proportions and (b) 0.1 to 10% by weight of the total, of a cavitation inhibiting organic compound, other than a member of the group of alcohols specified in (a), containing one or more hydrophilic groups and being at least partially soluble in component (a). When component (b) has a molecular weight below 1500 its solubility in (a) at 60-120 DEG C. must be 0.1 to 10% by weight. Component (a) may be a conventional anti-freeze solution containing 5 to 50% by weight of an alcohol containing 2 to 4 carbon atoms and 2 to 3 hydroxyl groups such as ethylene glycol, propanediol and glycerol. The hydrophilic groups of component (b) are hydroxyl groups, ether bridges, carboxylic acid amide groups, lactam groups, amino groups or carboxylate groups. Suitable organic compounds for (b) are polyalkylene glycols with 2 to 4 carbon atoms between the ether bridges preferably with molecular weights between 300 and 15,000; also compounds with a hydrocarbon structure containing 1 to 80 alkylene oxide groups (-CnH2nO-, where n is 2 to 4) or at least one of the hydrophilic groups formed as reaction products of e.g. ethylene oxide or propylene oxide with stearic amide, oleic acid monoethanulamide, caproamide, oleylamine, laurylamine, lauryl alcohol, capryl alcohol, stearyl alcohol, glycerol, caprolactam, laurolactam, polycaprolactam, polylaurolactam. Other compounds are polyesters of dicarboxylic acids, e.g. succinic acid, adipic acid, terephthalic acid with polyglycols; also polyvinylpyrrolidone, polyvinyl alcohol, protein such as bone glue and polysaccharides such as agar. Low molecular weight compounds are monohydric and dihydric alcohols with 6 to 20 carbon atoms, e.g. octanol-(2), 2-ethyl hexanol, lauryl alcohol, palmityl alcohol, stearyl alcohol, tridecanol. The cooling liquid may also contain 0.01 to 5% by weight of corrosion inhibitors such as borates, phosphates, alkali benzoates, nitrites, triethanolamine phosphate.ALSO:Cavitation in high speed diesel engine cooling systems is inhibited by circulating a cooling liquid comprising (a) water or an aqueous solution of a member of the group consisting of non polymerized saturated aliphatic alcohols completely mixable in water in all proportions and (b) 0.1 to 10% by weight of the total, of a cavitation inhibiting organic compound, other than a member of the group of alcohols specified in (a), containing one or more hydrophilic groups and being a least partially soluble in component (a). When component (b) has molecular weight below 1500 its solubility in (a) at 60 DEG -120 DEG C, must be 0.1 to 10% by weight. Component (a) may be a conventional anti-freeze solution containing 5 to 50% by weight of an alcohol containing 2 to 4 carbon atoms and 2 to 3 hydroxyl groups such as ethylene glycol, propanediol and glycerol. The hydrophilic groups of component (b) are hydroxyl groups, ether bridges, carboxylic acid amide groups, lactam groups, amino groups or carboxylate groups. Suitable organic compounds for (b) are polyalkylene glycols with 2 to 4 carbon atoms between the ether bridges preferably with molecular weights between 300 and 15,000; also compounds with a hydrocarbon structure containing 1 to 80 alkylene oxide groups (-Cn H2n O - , where n is 2 to 4) or at least one of the hydrophilic groups formed as reaction products of e.g. ethylene oxide or propylene oxide with stearic amide, oleic acid monoethanulamide, caproamide, oleylamine, laurylamine, lauryl alcohol, capryl alcohol stearyl alcohol, glycerol, caprolactam, laurolactam, polycaprolactam, polylaurolactam. Other compounds are polyesters of dicarboxylic acids e.g. succinnic acid, adipic acid terephthalic acid with polyglycols; also polyvinylpyrrolidone, polyvinyl alcohol, protein such as bone glue and polysaccharides such as agar. Low molecular weight compounds are monohydric and dihydric alcohols with 6 to 20 carbon atoms e.g. octanol - (2), 2-ethyl hexanol, lauryl alcohol, palmityl alcohol, stearyl alcohol, tridecanol. The cooling liquid may also contain 0.01% to 5% by weight of corrosion inhibitors such as borates, phosphates, alkali benzoates, nitrites triethanolamine phosphate.