Patent GB-846174-A (GB)
Title: Aluminium-containing organic compositions and method of preparing the same
IPC: C10M159/20
Filed: 1958-05-06
Abstract: A stable dispersion of aluminium hydroxide in an oleaginous composition is prepared by (a) mixing a slurry (consisting of an aluminium alkoxide and an alkanol, wherein the alkoxy radicle of the alkoxide is the same as that of the alkanol and contains 1-8 carbon atoms), with a sufficient quantity of a hydrocarbon solvent (which is the mineral lubricating oil known as pale oil or a volatile petroleum distillate such as gasoline or naphtha) to dissolve the slurry, and with a mixture consisting of an oil-soluble dispersing agent (chosen from tall oil, tall oil fatty acids, sulphonic acids and their metal salts, phenolic compounds and metal phenates thereof, non-ionic and cationic surface active agents, organic phosphorus compounds, phosphorus-sulphide-treated olefins, and metal soaps of carboxylic acids), an oleaginous liquid vehicle (chosen from vegetable, mineral lubricating and synthetic oils) and a quantity of water in excess of that required for the hydrolysis of the aluminium alkoxide, so that a uniform mixture is obtained, and then (b) condensing from the uniform mixture aluminium hydroxide particles, the diameter of which is less than 0.25 micron, by heating the uniform mixture so that the alkoxide is completely hydrolysed and volatile solvents and excess water are removed.  During stage (a) a portion of the aluminium alkoxide reacts with the oil-soluble dispersing agent, and an amount of aluminium alkoxide is used corresponding to 0.75-6 moles per mole of dispersing agent where the dispersing agent is an acid and 0.5-5 moles per mole of dispersing agent where the dispersing agent is other than an acid. Sulphonates which may be employed as dispersing agents include alkyl sulphonates, alkaryl sulphonates, mahogany sulphonates, diphenyl ether sulphonates, naphthalene disulphide sulphonates, diphenylamine sulphonates, dicetyl thianthrene sulphonates, dilauryl b  - naphthol sulphonates, dicapryl nitro-naphthalene sulphonates, unsaturated or hydroxy-substituted paraffin wax sulphonates, and chloro-substituted paraffin-wax-substituted cyclohexyl sulphonates.  Among the phenols, which may be employed as dispersing agents, are the alkyl-substituted phenol sulphides. Nonionic and cationic dispersing agents mentioned include polyglycol ethers and esters, amines, quaternary ammonium chlorides, substituted oxazolines and substituted imidazolines. The organic phosphorus compounds suitable as dispersing agents include the organic oxy-acids of tri- and penta-valent phosphorus, the corresponding thio-acids, and the salts of such acids.  The metal soaps of carboxylic acids which may be employed as dispersing agents include soaps of naphthenic acids, rosin acids, fatty acids and substituted fatty acids such as chlorostearic acid.  Synthetic oils which may be employed as the oleaginous liquid vehicle include polypropylene, polyoxyalkylene compounds and their esters, alkyl esters of adipic or azelaic acid, tricresyl phosphate and diethyl ester of decane phosphonic acid. The dispersions of aluminium hydroxide prepared according to the invention may be added as corrosion inhibitors to fuel oils, especially to such oils containing sodium and/or vanadium compounds.  In the examples, dispersions of aluminium hydroxide in mineral lubricating oil are prepared from aluminium isobutoxide or isopropoxide, using as the dispersing agent an alkyl benzene sulphonic acid, dinonyl naphthalene sulphonic acid, a petroleum sulphonic acid, tall oil or tall oil fatty acid.