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Raphael Katzen, Vincent B Diebold: Alcohol distillation process. Raphael Katzen Associates International, Hibben Noyes & Bicknell, November 9, 1976: US03990952 (139 worldwide citation)

A crude alcohol-containing mixture comprising a saturated aliphatic alcohol of not more than three carbon atoms and associated impurities is processed in a three-tower distillation system to permit recovery of the desired alcohol product in highly concentrated and purified form. In the first tower t ...


2
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 ...


3
Jairo H Lora, Raphael Katzen, Malcolm Cronlund, Chih F Wu: Recovery of lignin. Repap Technologies, Dilworth Paxson Kalish & Kauffman, August 16, 1988: US04764596 (84 worldwide citation)

Lignin is precipitated in high yields and at high rates from a black liquor produced by pulping wood at high temperatures and pressures with an aqueous lower aliphatic alcohol solvent. The lignin is precipitated by diluting the black liquor with water and an acid to form a solution with a pH of less ...


4
Richard C Agar, Jairo H Lora, Malcolm Cronlund, Chih Fae Wu, Gopal C Goyal, Stephen R Winner, Mikhail N Raskin, Raphael Katzen, Ron LeBlanc: Method of recovering furfural from organic pulping liquor. Reed Smith Shaw & McClay, August 4, 1998: US05788812 (42 worldwide citation)

This invention provides for the recovery of lignin and other by-products from the pulping of fibrous plant material. In accordance with this invention, solvents and filtrates are recovered and recycled for reuse. This results in significant solvent and energy savings. Filtrates from the bleaching an ...


5
Raphael Katzen, George D Moon Jr, Jimmy D Kumana: Distillation system for motor fuel grade anhydrous alcohol. Raphael Katzen Associates International, Merriam Marshall & Bicknell, August 12, 1980: US04217178 (32 worldwide citation)

An improved distillation method is provided for obtaining motor fuel grade anhydrous ethanol from fermentation or synthetic feedstocks. A three tower system is used comprising a stripper-rectifier tower in which the dilute feedstock is converted to a concentrated ethanol stream, a dehydrating tower ...


6
Allan E Hokanson, Raphael Katzen, Edward F Button: Process for removing contaminants from hot waste gas streams. International Telephone and Telegraph Corporation, James B Raden, Harold J Holt, May 18, 1976: US03957951 (7 worldwide citation)

A process for removing sulfur dioxide and other contaminants from a hot waste gas stream in which the waste gas stream is cooled to a temperature below 100.degree.F and then passed in sequence through two separate absorption zones utilizing as the absorbent a recirculated aqueous solution of ammoniu ...


7
Kurt F Kaupisch, Douglas W Bennett, Raphael Katzen: Removal of contaminants and recovery of by-products from hot waste gas stream. International Telephone & Telegraph Corporation, James B Raden, Harold J Holt, February 3, 1981: US04248842 (6 worldwide citation)

A process for the removal of sulfur dioxide and other contaminants and the recovery of ammonium sulfate as a by-product from a hot waste gas stream comprising cooling the waste gas stream to a temperature below 120.degree. F., passing said waste gas stream in sequence through at least two separate a ...


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