Patent GB-494451-A (GB)
Title: A process for removing acid components from hydrocarbons or derivatives thereof
IPC: C10G19/04
Filed: 1937-09-28
Abstract: Hydrocarbons or derivatives thereof are freed from acid reacting organic substances by extraction with an alkaline solution in the presence of one or more mono-, di-, or triethylene glycol alkyl ethers, in which the alkyl group contains 1 to 3 carbon atoms. Aqueous solutions, of concentration 2 to 6 N, of alkali metal or alkaline earth hydroxides, ammonia, quaternary ammonium bases, alkali carbonates or bicarbonates, containing from 25 to 75 per cent of the glycol ether are used. Petroleum or distillates thereof; benzene, toluene, xylene; chlorinated hydrocarbons such as chlorethane, ethylene dichloride, trichlorethylene, carbon tetrachloride, chlorpropane, chlorbenzene; brombenzene; nitro ethane, nitrobenzene; amylamine, aniline or pyridine are treated.  Mercaptans, phenols, naphthenic and fatty acids are thereby removed.  Glycol ethers specified are, mono-, di, and triethylene glycol monoethyl ethers, and the corresponding methyl ethers.  Extraction is effected by batch or a countercurrent method.  After extraction, the treated hydrocarbon is washed with water to remove any glycol ether which is recovered, and the hydrocarbon may be further treated with hypochlorite, oxidation by air in the presence of catalysts or Doctor solution.  The extraction liquid may be regenerated by solvent extraction, steam distillation under reduced pressure, oxidation by air or, if mercaptans only are present, by steam distillation under increased pressure using water as a reflux liquid, whereby the mercaptans are distilled off.  British Specification 469,573 and U.S.A.  Specification 2,059,075 are referred to.ALSO:Hydrocarbons and derivatives thereof are freed from acid-reacting organic components by extraction with an alkaline solution in the presence of one or more mono-, di, or tri-ethylene glycol alkyl ethers, in which the alkyl group contains 1 to 3 carbon atoms.  Aqueous solutions, of concentration 2 to 6N, of alkali metal or alkaline earth hydroxides, ammonia, quaternary ammonium bases, alkali carbonates or bicarbonates, containing from 25 to 75 per cent of the glycol ether are used.  Petroleum or distillates thereof, benzene, toluene, xylene; chlorinated hydrocarbons such as chlorpropane, ethylene dichloride, trichlorethylene, carbon tetra chloride, chlorbenzene; brombenzene; nitroethane, nitrobenzene; amylamine, aniline, or pyridine are treated.  Mercaptans, phenols, naphthenic and fatty acids are removed.  Glycol ethers specified are, mono-, di-, and tri-ethylene glycol monoethyl ethers and the corresponding methyl ethers.  Extraction is effected by a batch or countercurrent method. After extraction, the treated hydrocarbon is washed with water to remove any glycol ether which is recovered, and the hydrocarbon may be further treated with hypochlorite, oxidation by air in the presence of catalysts, or Doctor solution.  The extraction liquid may be regenerated by solvent extraction, steam distillation under reduced pressure, oxidation by air, or if mercaptans only are present by steam distillation under increased pressure using water as reflux liquid, whereby the mercaptans are distilled off.  British Specification 469,573 and U.S.A. Specification 2,059,075 are referred to.