Patent GB-439128-A (GB)
Title: Process for the treatment of waxes, fats, or mixtures of higher fatty acid esters, or of higher alcohols
IPC: C11B7/00
Filed: 1934-07-11
Abstract: Crude esters of fatty acids containing at least seven carbon atoms, or fatty alcohols containing at least seven carbon atoms, are separated into their saturated and less saturated or unsaturated constituents by dissolving the raw material completely in a solvent or mixture of solvents at an elevated temperature and then cooling the solution whereupon the more saturated constituents separate and are removed.  Natural fats such as fine tallow or cotton seed oil, mixtures of alcohols obtained from spermaceti or by reducing fatty acids may be treated.  Solvents specified are liquid sulphur dioxide, phenol, nitrobenzene, b .b <1>-dichlor ethyl ether, furfurol, acetone, liquid paraffinic or aromatic hydrocarbons such as benzine, toluene or xylene; deca- or tetra-hydronaphthalene, carbon tetrachloride, ethylene dichloride, trichlorethylene, chlorobenzene, ethyl ether, dioxane, cyclohexanone; methyl-ethyl or propyl alcohol; methyl formate or acetate, amyl acetate, methyl glycol acetate, ethylene glycol monoacetate, ethyl carbonate, ethyl chlorocarbonate, chloracetone, carbon disulphide or mixtures such as phenol and water or glycerine, furfurol and benzine.  In an example, crude cetyl alcohol obtained by saponifying spermaceti, is dissolved at 40 DEG C. in liquefied sulphur dioxide and the solution is cooled to 0 DEG C.  The purified cetyl alcohol is precipitated and after separating by filtering is re-extracted or washed with a further amount of solvent.  The filtrate is freed from sulphur dioxide leaving a residue of oleyl alcohol.  The Specification as open to inspection under Sect. 91 refers also to the treatment of higher fatty acids obtained from animal or vegetable oils and fats.  This subject-matter does not appear in the Specification as accepted.ALSO:Waxes, fats and fatty acid esters or alcohols containing at least 7 carbon atoms are separated into their saturated and less saturated or unsaturated constituents by dissolving the raw material completely in a solvent or mixture of solvents at an elevated temperature and then cooling the solution whereupon the more saturated constituents separate and are removed.  Natural waxes or fats such as fine tallow or cotton seed oil, mixtures of alcohols obtained by splitting spermaceti or by reducing fatty acids may be treated.  Solvents specified are, liquid sulphur dioxide, phenol, nitrobenzene, b  b <1> dichlorethyl ether, furfurol, acetone, liquid paraffinic or aromatic hydrocarbons such as benzine, toluene, or xylene; deca-or tetra-hydronaphthalene, carbon tetrachloride, ethylene dichloride, trichlorethylene, chlorobenzene, ethyl ether, dioxane, cyclohexanone; methylethyl or propyl alcohol; methyl formate or acetate, amyl acetate, methyl glycol acetate, ethylene glycol monoacetate, ethyl carbonate, ethyl chlorocarbonate, chloracetone, carbon disulphide or mixtures such as phenol and water or glycerine or furfurol and benzine.  Crude cetyl alcohol obtained by the saponification of spermaceti, is dissolved at 40 DEG  C. in liquefied sulphur dioxide and the solution is cooled to 0 DEG  C. The purified cetyl alcohol is precipitated and after separation by filtering is re-extracted or washed with a further amount of solvent. The filtrate is freed from sulphur dioxide leaving a residue of oleyl alcohol.  The Specification as open to inspection under Sect. 91 refers also to the treatment of higher fatty acids obtained from animal or vegetable oils and fats.  This subject-matter does not appear in the Specification as accepted.