Patent GB-743177-A (GB)
Title: Process for the separation of straight chain compounds from mineral oil fractions
Inventor: WINWARD ANTONY
Filed: 1952-03-25
Abstract: Straight chain organic compounds are separated from mixtures comprising mineral oil fractions by contacting in the liquid phase with solid urea, thiourea, seleno-urea or telluro-urea, in the presence of less than 25 per cent, based on the solid solute, of ethanolamine, acetonitrile, or a C1-C6 mono- or dihydric alcohol such as methanol, ethanol and ethylene glycol; the complexes formed between the urea &c. and the straight chain organic compounds are separated and decomposed by treatment with a non-aqueous inert diluent at an elevated temperature, and the recovered urea &c. is recycled to the reaction zone.  The mol. ratio of the solid urea &c. to the complex-forming component of the mixture is not less than 6 : 1, and the rate of flow of the mixture through the reaction zone is such that the solid is entrained in the liquid.  The mixtures to be treated may be diluted with a diluent such as a proportion of the treated material from the reaction or regeneration zones.  The non-aqueous diluent used in the regeneration step may be a liquid aromatic or naphthenic hydrocarbon such as benzene or cyclohexane. The mineral oil fractions may be treated with solid urea, and the complexes treated with the non-aqueous diluent, in a co-current or countercurrent manner; the solids and liquids from the reaction zone may be separted by filtration, centrifuging, or gravity settling. Complex formation may be effected in a series of stages by varying the temperature, urea concentration and solvents concentration; also, the reactive compounds in the urea complex may be fractionated by varying the decomposition temperatures in the regeneration zone.ALSO:Straight chain organic compounds are separated from mixtures comprising mineral oil fractions by contacting in the liquid phase with solid urea, thiourea, sebeno-urea or telluro-urea, in the presence of less than 25 per cent, based on the solid solute, of ethanolamine, acetonitrile, or a C1 - C6 mono- or dihydric alcohol such as methanol, ethanol and ethylene glycol; the complexes formed between the urea &c. and the straight chain organic compounds are separated and decomposed by treatment with a non-aqueous inert diluent at an elevated temperature, and the recovered urea &c. is recycled to the reaction zone.  The mole ratio of the solid urea &c. to the complex-forming component of the mixture is not less than 6:1, and the rate of flow of the mixture through the reaction zone is such that the solid is entrained in the liquid.  The mixtures to be treated may be diluted with a diluent such as a proportion of the treated material from the reaction or regeneration zones.  The nonaqueous diluent used in the regeneration step may be a liquid aromatic or naphthenic-hydrocarbon such as benzene or cyclohexane. The mineral oil fractions may be treated with solid urea, and the complexes treated with the non-aqueous diluent, in a cocurrent or countercurrent manner; the solids and liquids from the reaction zone may be separated by filtration, centrifuging, or gravity settling. Complex formation may be effected in a series of stages by varying the temperature, urea concentration and solvents concentration; also, the reactive compounds in the urea complex may be fractionated by varying the decomposition temperatures in the regeneration zone.