Patent GB-839112-A (GB)
Title: Preventing the formation of and removing deposits of solid paraffins
IPC: C09K8/524
Filed: 1958-10-10
Abstract: The deposition of normally solid paraffins from petroleum is prevented by incorporating in the petroleum an amine derivative formed by reaction between a substantially water-insoluble fatty acid and a primary or secondary amine whose nitrogen has attached thereto organic radicles having not more than two carbon atoms per radicle. The amine derivative is one formed by reaction between the amine and the fatty acid at a temperature not more than 200 DEG  F. in amounts such that the reaction product forms a colourless 5% solution in (a) mixtures of at least 55 vol. per cent of isopropyl alcohol with water and (b) mixtures of at least 55 vol. per cent of toluene with iso-octane.  The fatty acids may be saturated or unsaturated C12-C18 fatty acids or mixtures thereof, tall oil, or the dimerized fatty acids obtained as a residue in the production of sebacic acid by heat degradation of castor oil. The amine may be chosen from mono- or di-methylamine or -ethylamine, dimethanolamine, mono- or di-ethanolamine, ethylene diamine, dimethylene or diethylene triamine, and polyethylene polyamines.  The amine/fatty acid reaction products are amine salts and may be added to the petroleum in the form of a solution in an organic solvent (e.g. a hydrocarbon or chlorinated organic compound.  In examples, xylene solutions of (a) reaction products of the above-mentioned dimerized fatty acids with monoethanolamine, ethylene diamine or diethylene triamine, or (b) a monoethanolamine/tall oil reaction product, are added to crude petroleum.ALSO:An amine derivative, suitable for addition to petroleum to prevent the deposition therefrom of normally solid paraffins, and suitable for use (in the form of a solution in a hydrocarbon solvent) as a solvent for deposits of normally solid paraffins (see Groups III and XVIII), is formed by reaction between a substantially water-insoluble fatty acid and a primary or secondary amine whose nitrogen has attached thereto organic radicles having not more than two carbon atoms per radicle.  The amine derivative is one formed by reaction between the amine and the fatty acid at a temperature not more than 200 DEG  F. in amounts such that the reaction product forms a colourless 5% solution in (a) mixtures of at least 55 vol. per cent of isopropyl alcohol with water and (b) mixtures of at least 55 vol. per cent of toluene with isooctane.  The fatty acids may be saturated or unsaturated C12-C18 fatty acids or mixtures thereof, tall oil, or the dimerized fatty acids obtained as a residue in the production of sebacic acid by heat degradation of castor oil. The amine may be chosen from mono- or dimethylamine or -ethylamine, dimethanolamine, mono- or di-ethanolamine, ethylene diamine, dimethylene or diethylene triamine, and polyethylene polyamines.  The reaction between the amine and the fatty acid may be carried out in solution in a non-reactive organic solvent (e.g. an aromatic hydrocarbon, a chlorinated organic compound or mixtures thereof) and the reaction products are amine salts.  In examples: (a) the above-mentioned dimerized fatty acids are reacted with monoethanolamine, ethylene diamine or diethylene triamine, and (b) tall oil is reacted with monoethanolamine.