1
Ramachandran Krishnamurthy, Steve L Lerner, Donald L MacLean: PSA multicomponent separation utilizing tank equalization. The Boc Group, Larry R Cassett, Chris P Konkol, March 28, 1989: US04816039 (65 worldwide citation)

The inclusion of one or more tanks in a two-bed pressure swing adsorption system provides for a further reduction in the pressure from which each bed is vented. According to the invention, following a bed pressure equalization step, the bed which is to undergo regeneration is equalized with at least ...


2
Duane E King, Billy J Harris, Donald L MacLean, Tommy E Graham: Hollow fiber permeator apparatus. Monsanto Company, Thomas E Kelley, Howard C Stanley, Norman L Balmer, February 16, 1982: US04315819 (64 worldwide citation)

The performance of axially-fed permeators containing a plurality of selectively permeable hollow fibers suitable for the selective permeation of at least one fluid in a fluid mixture containing at least one other component, wherein the hollow fibers are positioned in the permeator to form an elongat ...


3
Donald L Maclean, Ramachandran Krishnamurthy, Steven L Lerner: Argon recovery from hydrogen depleted ammonia plant purge gas utilizing a combination of cryogenic and non-cryogenic separating means. The Boc Group, Larry R Cassett, Chris P Konkol, August 18, 1987: US04687498 (39 worldwide citation)

An improved process is disclosed for argon recovery from an ammonia synthesis plant purge gas stream comprising hydrogen, nitrogen, argon, methane, and ammonia. This purge gas is conventionally subjected to ammonia absorption and a first membrane separation of hydrogen for recycle to the ammonia pla ...


4
Ramachandran Krishnamurthy, Donald L MacLean: Argon recovery from argon-oxygen-decarburization process waste gases. The BOC Group, Robert I Pearlman, Coleman R Reap, June 30, 1992: US05125934 (36 worldwide citation)

The present invention is directed to a method for recovering argon from a feed mixture comprising argon, carbon monoxide, carbon dioxide, nitrogen, and hydrogen which comprises the steps of (a) purifying the feed mixture to remove contaminants, (b) compressing the purified feed mixture to a separati ...


5
Tommy E Graham, Donald L MacLean: Process for hydrogen recovery from ammonia purge gases. Monsanto Company, Norman L Balmer, Howard C Stanley, James W Williams Jr, December 25, 1979: US04180552 (36 worldwide citation)

Ammonia synthesis processes are disclosed which provide enhanced recovery of hydrogen from ammonia synthesis purge streams by selective permeation. The enhanced recovery of hydrogen can provide increased conversion of hydrogen values to ammonia. In the processes, a purge stream from an ammonia synth ...


6
Andrew Lloyd Williams, Donald L MacLean, Ravi Jain, Steven L Lerner: PSA process and apparatus employing gaseous diffusion barriers. The BOC Group, R Hain Swope, Larry R Cassett, August 23, 1988: US04765804 (36 worldwide citation)

There is disclosed an improved PSA process and apparatus for gas enrichment wherein the pressure levels of the vent gas stream and/or product stream are used to drive gaseous diffusion cells to produce a feed gas stream and/or a purge gas stream to be used in the pressure swing adsorption process to ...


7
Yongxian Zeng, Satish S Tamhankar, Narayanan Ramprasad, Ravi Jain, Donald L MacLean: Cyclic autothermal hydrocarbon reforming process. The BOC Group, Philip H Von Neida, July 13, 2004: US06761838 (36 worldwide citation)

Partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide is carried out by a cyclical process, which includes (a) contacting an oxygen ion conducting ceramic with air at a pressure between about 1 and 50 bara in a reactor, wherein oxygen from the air reacts with the ceramic, thereby ...


8
Akhilesh Kapoor, Ramachandran Krishnamurthy, Donald L MacLean: Hydrogen and carbon monoxide production by partial oxidation of hydrocarbon feed. The BOC Group, Coleman R Reap, Larry R Cassett, July 23, 1996: US05538706 (35 worldwide citation)

Synthesis gas comprising hydrogen, water, carbon monoxide, carbon dioxide, and hydrocarbons is produced by contacting a gasified hydrocarbon feedstock and an oxidant in a partial oxidation reactor under at least 95% carbon monoxide selective, low hydrocarbon conversion conditions wherein the tempera ...


9
Ramachandran Kirshnamurthy, Donald L MacLean: Method and apparatus of producing carbon dioxide in high yields from low concentration carbon dioxide feeds. The BOC Group, Carol A Nemetz, Robert I Pearlman, August 28, 1990: US04952223 (29 worldwide citation)

A process for producing substantially pure liquid carbon dioxide from a carbon dioxide feed containing about 35 to about 98% by volume of carbon dioxide wherein a waste stream containing carbon dioxide is separated from contaminants in a pressure swing adsorption apparatus and then recycled to the c ...


10
Donald L MacLean, Robert T Estes: Polyester filament-forming polymer and its method of production. Monsanto Company, Robert L Broad Jr, September 12, 1978: US04113704 (27 worldwide citation)

Significantly higher productivity of polyester feed yarn is achieved when the polymer from which the feed yarn is melt spun is chain-branched with multifunctional chain branches having 1-15 microequivalents of reactive branching sites based on one gram of the polymer. This productivity increase (ove ...