41
Lloyd Berg, Pisant Ratanapupech: Separation of ethyl acetate from ethanol and water by extractive distillation. April 5, 1983: US04379028 (138 worldwide citation)

Ethyl acetate cannot be completely removed from ethanol and water mixtures by distillation because of the presence of the minimum ternary azeotrope. Ethyl acetate can be readily removed from mixtures containing it, ethanol and water by using extractive distillation in which the extractive distillati ...


42
Jeffrey P Knapp: Low energy extractive distillation process for producing anhydrous ethanol. University of Massachusetts, Welsh & Katz, July 30, 1991: US05035776 (133 worldwide citation)

A thermally-integrated extractive distillation process for recovering anhydrous ethanol from fermentation or synthetic feedstocks has a distillation train of four columns. Two columns are preconcentrators operated in parallel. The remaining columns are an extractive distillation dehydrating tower, a ...


43
Larry W Browder, James C Medlin, Art T Spaugh Jr: Extraction process for removal of impurities from terephthalic acid filtrate. Eastman Kodak Company, Charles R Martin, William P Heath Jr, July 3, 1990: US04939297 (133 worldwide citation)

A method for removing impurities from an oxidative terephthalic acid synthesis mother liquor containing acetic acid, water, corrosion metals, a metal catalyst and organic impurities, comprising the steps of (a) removing from the mother liquor by evaporation from 50-95% of the acetic acid and water c ...


44
Jorge Heller, Robert F Helwing, Donald W Penhale: Polymers of di- (and higher functionality) ketene acetals and polyols. SRI International, Edward B Gregg, Donovan J DeWitt, December 8, 1981: US04304767 (126 worldwide citation)

This invention concerns ortho ester polymers having repeating mer units represented by the general formulas: ##STR1## The polymers are formed by a condensation reaction between ketene acetals having a functionality of two or more and hydroxyl containing compounds having a functionality of two or mor ...


45
Allan T Van Huisen, Paul E Griffin: Geothermal petroleum refining. Poms Smith Lande & Rose, February 3, 1981: US04248306 (125 worldwide citation)

Petroleum is distilled into fractions and/or cracked to form gas and/or lighter oil fractions by pumping the oil into the boiler section of a unit disposed in a hot, deep, subterranean geothermal zone. The distillation can be aided by forming steam from the geothermal heat as a thermal carrier.


46
Burke F Brush, Raphael Katzen: Hydrous alcohol distillation method and apparatus. Raphael Katzen Associates International, Merriam Marshall & Bicknell, December 22, 1981: US04306942 (124 worldwide citation)

An improved distillation method and apparatus are provided for recovering hydrous ethanol from fermentation or synthetic feedstocks. Substantial energy savings are realized by utilizing a pair of stripper-rectifier towers in which overhead vapors from one tower operating at a higher pressure supply ...


47
Kimberly Ann Horan, Carl David Murphy, Russell Mark Stephens, R Jay Warner, Kenneth Allen Windhorst: Process improvement for continuous ethyl acetate production. Celanese International Corporation, M Susan Spiering, July 27, 2004: US06768021 (123 worldwide citation)

Disclosed herein is an improved process for producing ethyl acetate comprising contacting acetic acid and ethanol in a reaction zone in the presence of an acid catalyst, distilling formed vapors and condensing to form an organic phase rich in ethyl acetate and an aqueous phase rich in water, separat ...


48
Stephen William Colley, Christopher Richard Fawcett, Colin Rathmell, Michael William Marshall Tuck: Process for the preparation of ethyl acetate. Davy Process Technology, Senniger Powers, October 26, 2004: US06809217 (120 worldwide citation)

Ethanol is dehydrogenated in the presence of hydrogen over a dehydrogenation catalyst, for example, a copper on silica catalyst. The liquefiable products present in the resulting intermediate reaction product mixture are selectively hydrogenated over a suitable catalyst, such as 5% ruthenium on carb ...


49
Stephen William Colley, Norman Harris, Colin Rathmell: Process for purification of alkyl alkanoate. Davy Process Technology, Senniger Powers Leavitt & Roedel, October 14, 2003: US06632330 (118 worldwide citation)

A process for the recovery of substantially pure alkyl alkanoate, such as ethyl acetate, from an impure feedstock. The impure feedstock is contacted with a selective hydrogenation catalyst in the presence of hydrogen in a selective hydrogenation zone maintained under selective hydrogenation conditio ...


50
Masatoshi Yanagawa, Kazunori Watanabe, Fumio Nakahara: Method of producing carboxylic acid and alcohol. Kuraray, Oblon Spivak McClelland Maier & Neustadt P C, October 8, 2002: US06462231 (118 worldwide citation)

A method of producing carboxylic acid and alcohol, that includes: supplying a liquid to a first distillation tower, said liquid including a carboxylic acid ester, and said first distillation tower being operated in a total reflux condition, to obtain a side stream; supplying said side stream to a hy ...