Recovery of isopropyl acetate and ethanol from an isopropyl acetate, ethanol and water-containing stream
November 21, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1536545 1898737 3578689 Separation of ethyl acetate from ethanol and water by extractive distillation Separation of methanol from acetone by extractive distillation Separation of n-butyl acetate from n-butanol by extractive distillation Separation of isopropyl acetate from isopropanol by extractive distillation Separation of isopropyl acetate from isopropanol by extractive distillation Method to separate polar organic compounds, in particular aliphatic alcohols, from fermentation fluids Patent #: 4715932 InventorAssigneeApplicationNo. 439830 filed on 11/21/1989US Classes:203/43, Utilizing liquid-liquid extracting of distillation product203/73, One a distillation under positive pressure or vacuum203/98, AND RETURNING PRODUCT OF DISTILLATION STEP TO DISTILLATION ZONE560/248, Purification or recovery568/918By plural liquid phase separationExaminersPrimary: Bascomb, Wilbur L. Jr.Attorney, Agent or FirmForeign Patent References
International ClassesB01D 003/16C07C 029/86 C07C 067/58 AbstractHigh purity isopropyl acetate and ethanol are recovered from a process stream containing isopropyl acetate, ethanol and water by a multiple step process including extracting substantially all of the ethanol from the stream using water as a solvent, stripping the extract stream to remove substantially all of the remaining isopropyl acetate as an overhead recycle stream, which is combined with the fresh feed stream prior to the extraction step, fractionating the ethanol-rich stripping column bottoms stream to produce a ethanol-water azeotropic overhead stream and using a portion of the fractionating column bottoms stream as the solvent for the extraction step.Other References
Field of SearchUtilizing liquid-liquid extracting of distillation productOf distillate And distilling raffinate phase And distilling extractant phase PLURAL DISTILLATIONS PERFORMED ON SAME MATERIAL One a distillation under positive pressure or vacuum Including the addition of water or steam From organic compound Ethanol AND RETURNING PRODUCT OF DISTILLATION STEP TO DISTILLATION ZONE And returning product of distillation step to distillation zone Purification or recovery Purification or recovery By plural liquid phase separation By dehydration |
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