Patent GB-475070-A (GB)
Title: An improved method for the purification of animal and vegetable oils, fats, waxes, and the therapeutic concentrates obtained therefrom
IPC: C11B3/06
Filed: 1936-07-03
Abstract: Animal and vegetable oils, fats, and waxes and therapeutic concentrates thereof, are purified by extracting with a furane derivative containing an aldehyde group, such as furfural or its homologues, e.g. 4 : methyl or 4 : ethyl furfural, and separating the extractant containing the dissolved impurities from the material being treated.  The furane derivative may be used in conjunction with a neutral solvent such as heptane, the action of which is to decrease the mutual solubility of the material being treated and the furane derivative without substantially decreasing the solubility of the impurities in the extractant. The material may be treated with the extractant in a separating funnel or in counter-current extraction apparatus.  The furane derivative is distilled off for re-use, and the extracted material may be subjected to a high vacuum, or shaken with an aqueous solution of sodium bisulphite, to remove traces of the extractant. Fish oils, such as cod or halibut liver oils, or salmon, whale or sperm oils, vegetable oils such as cotton, linseed, coconut, grape seed or wheat germ oils, and fatty material such as mutton fat or beef tallow, may be treated by the process.  In examples, dogfish oil, cod liver oil, crude linseed oil, and high vitamin-containing fractions obtained by the molecular distillation of fish oil are extracted with furfural, salmon oil is extracted with methyl furfural, and a vitamin-containing concentrate from a fish liver oil is dissolved in heptane and extracted with furfural. According to the Specification as open to inspection under Sect. 91, the extractant may be a furane derivative, e.g. furfuryl alcohol or tetrahydrofurfuryl alcohol.  This subject-matter does not appear in the Specification as accepted.ALSO:Animal and vegetable oils, fats, and waxes, and therapeutic concentrates thereof, are purified by extracting with a furane derivative containing an aldehyde group, such as furfural or its homologues, e.g. 4 : methyl or 4 : ethyl furfural, and separating the extractant containing the dissolved impurities from the material being treated.  The furane derivative may be used in conjunction with a neutral solvent such as heptane, the action of which is to decrease the mutual solubility of the material being treated and the furane derivative, without substantially decreasing the solubility of the impurities in the extractant. The material may be treated with the extractant in a separating funnel or in counter-current extraction apparatus.  The furane derivative is distilled off for re-use, and the extracted material may be subjected to a high vacuum, or shaken with an aqueous solution of sodium bisulphite, to remove traces of the extractant. Fish oils, such as cod or halibut liver oils, or salmon, whale or sperm oils, vegetable oils such as cotton, linseed, coconut, grapeseed or wheat germ oils, and fatty material such as mutton fat or beef tallow may be treated by the process.  In examples, dogfish oil, cod liver oil, crude linseed oil, and high vitamin-containing fractions obtained by the molecular distillation of fish oil are extracted with furfural, salmon oil is extracted with methyl furfural, and a vitamin-containing concentrate from a fish liver oil is dissolved in heptane and extracted with furfural.  According to the Specification as open to inspection under Sect. 91, the extractant may be a furane derivative, e.g. furfuryl alcohol or tetrahydrofurfuryl alcohol.  This subject-matter does not appear in the Specification as accepted.