Patents Assigned to Stone & Webster Engineering Corp.
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Patent number: 6383455Abstract: A cracking furnace within the firebox of which is located a ceramic structure presenting opposing wall surfaces which thereby define a slot-like passageway through which hydrocarbons may be fed through the firebox of the furnace. This ceramic structure is capable of service under much greater heat loads and temperatures than are metallic reaction lines as have heretofore been used, allowing for a greater firebox temperature which in turn produces an even more rapid cracking of saturated hydrocarbon into ethylene at millisecond residence times within the firebox limits.Type: GrantFiled: September 19, 1997Date of Patent: May 7, 2002Assignee: Stone & Webster Engineering Corp.Inventors: Dennis A. Duncan, Joseph M. Gondolfe
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Patent number: 6312652Abstract: A furnace construction for cracking of saturated hydrocarbon feed stocks to olefinic product mixtures, wherein the reaction lines of such furnace are fabricated of a ceramic refractory feed inlet pipe coaxially located with a ceramic refractory tube to define an annular space there between which in part is located without and within the radiant heating firebox volume of such furnace, this to provide for a zone wherein hot cracked olefin product gas is quenched in temperature in such annular space outside of such firebox and a cracking zone within the firebox within which hydrocarbon feed is cracked to an olefin containing product gas composition. The ceramic refractory material construction permits of such pipe-tube reaction line structure to be exposed to a much greater heat/temperature content of which the firebox is capable than reaction lines of metallic construction.Type: GrantFiled: September 19, 1997Date of Patent: November 6, 2001Assignee: Stone & Webster Engineering Corp.Inventor: Dennis A. Duncan
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Patent number: 6271433Abstract: The invention relates to a new process for more efficient separation and recovery of light olefins such as ethylene and propylene from a fluid catalytic cracking unit. The new process invention for recovering olefins from a mixture of cracked hydrocarbons from a fluid catalytic cracker comprises the steps of: (a) providing a mixture of cracked hydrocarbons including methane, ethylene, ethane, propylene, propane, butylene, butane and heavier hydrocarbons such as naphtha produced in a fluid catalytic cracker; (b) separating said mixture into (i) a first stream comprising substantially all of said ethane, ethylene, and methane and a major portion of said propane and propylene and (ii) a second stream comprising a portion of said butylene and butane, and a major portion of said heavier hydrocarbons; and (c) processing said first stream to recover the ethylene and propylene therefrom, and the details of such process described herein.Type: GrantFiled: February 22, 1999Date of Patent: August 7, 2001Assignee: Stone & Webster Engineering Corp.Inventors: Ginger S. Keady, Juan Puerto, Berj Garbouchian
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Patent number: 6267359Abstract: The present invention relates to the use of orthogonal tray stiffeners in supporting tray panels for process tray.Type: GrantFiled: April 26, 1995Date of Patent: July 31, 2001Assignee: Stone & Webster Engineering Corp.Inventor: John Stippick
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Patent number: 5981818Abstract: A novel process is provided which integrates the cracking of hydrocarbon containing feedstocks with the olefins purification and olefins derivative process utilizing dilute olefin feedstocks.Type: GrantFiled: October 18, 1996Date of Patent: November 9, 1999Assignee: Stone & Webster Engineering Corp.Inventors: David Purvis, Richard H. Mc Cue
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Patent number: 5976355Abstract: A process for producing liquid fuels from heavy hydrocarbons such as residual oil in which the cracking temperatures are in the range of 800.degree. F. to 1200.degree. F., and the residence times are between 0.05 seconds and 0.50 seconds.Type: GrantFiled: December 14, 1995Date of Patent: November 2, 1999Assignee: Stone & Webster Engineering Corp.Inventors: Axel R. Johnson, Robert J. Gartside, Joseph L. Ross, Dennis A. Duncan
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Patent number: 5939596Abstract: The present invention provides a process and system for the removal of butadiene from a cracked gas stream prior to entering a front end hydrogenation reactor in an olefin production facility.Type: GrantFiled: January 12, 1998Date of Patent: August 17, 1999Assignee: Stone & Webster Engineering Corp.Inventor: Mark Whitney
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Patent number: 5859304Abstract: The present invention provides an improved method for recovering high purity olefins from cracked gas effluents or other parafin/olefin gaseous mixtures by use of a chemical absorption process.Type: GrantFiled: December 13, 1996Date of Patent: January 12, 1999Assignee: Stone & Webster Engineering Corp.Inventors: Richard Barchas, Richard McCue, Jr., Christopher Wallsgrove, Mark Whitney
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Patent number: 5837129Abstract: The invention is a process and apparatus for rapidly and efficiently separating a fluidized catalytic cracking mixture into cracking catalysts and hydrocarbon vapor. The invention decreases the production of unwanted hydrocarbon byproducts by decreasing the contact time between the separated hydrocarbon vapor and the cracking catalyst.Type: GrantFiled: May 2, 1994Date of Patent: November 17, 1998Assignee: Stone & Webster Engineering Corp.Inventors: Joseph L. Ross, Jr., Charles Schaub
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Patent number: 5768913Abstract: A process and system for providing cooling service (refrigerant) for a gas separation process wherein the refrigerant is obtained from the system process fluid and after serving as refrigerant is returned to the process side for separation into product.Type: GrantFiled: April 16, 1997Date of Patent: June 23, 1998Assignee: Stone & Webster Engineering Corp.Inventors: Richard H. McCue, Jr., Mark Whitney, John L. Pickering, Jr., David Chen
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Patent number: 5766558Abstract: The present invention provides an apparatus for improving the contacting of feedstock and regenerated catalytic particulates in certain fluid catalytic cracking processes and apparatus.Type: GrantFiled: November 6, 1996Date of Patent: June 16, 1998Assignee: Stone & Webster Engineering Corp.Inventors: Warren S. Letzsch, Gerald Earl
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Patent number: 5763715Abstract: The present invention provides a process and system for the removal of butadiene from a cracked gas stream prior to entering a front end hydrogenation reactor in an olefin production facility.Type: GrantFiled: October 8, 1996Date of Patent: June 9, 1998Assignee: Stone & Webster Engineering Corp.Inventor: Mark Whitney
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Patent number: 5523502Abstract: A novel process having improved flexibility in olefins production is provided which integrates a deep catalytic cracking process with a steam cracking process, and optionally, also including steps of disproportionation and C.sub.4 hydrocarbon processing including methyl tertiary butyl ether synthesis.Type: GrantFiled: November 10, 1993Date of Patent: June 4, 1996Assignee: Stone & Webster Engineering Corp.Inventor: Jacob N. Rubin
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Patent number: 5427655Abstract: A quench boiler apparatus and process is disclosed wherein the hot effluent gases are indirectly cooled by contact with a central internal cold side, one or more internal bayonets and one or more waterwall tubes.Type: GrantFiled: November 17, 1993Date of Patent: June 27, 1995Assignee: Stone & Webster Engineering Corp.Inventors: Herman N. Woebcke, Victor Andruszewski
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Patent number: 5382707Abstract: There is provided a novel integrated process for producing methyl tertiary butyl ether from a C.sub.4 containing hydrocarbon feedstock comprising passing the feedstock through zones of butadiene hydrogenation, MTBE synthesis, paraffin/olefin separation and skeletal isomerization.Type: GrantFiled: May 20, 1994Date of Patent: January 17, 1995Assignee: Stone & Webster Engineering Corp.Inventors: Jacob N. Rubin, Johannes C. Norenburg
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Patent number: 5368726Abstract: The present invention relates to an apparatus for treating and regenerating a spent caustic solution at ambient temperatures which includes means for oxidizing the spent caustic stream with an air/ozone gas mixture, followed by irradiating the oxidized spent caustic stream with a broad range of ultraviolet radiation and finally filtering the spent caustic solution.Type: GrantFiled: August 27, 1993Date of Patent: November 29, 1994Assignee: Stone & Webster Engineering Corp.Inventor: Stephen Z. Masoomian
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Patent number: 5340545Abstract: A catalytic cracking unit is disclosed which provides for quenching of a riser reactor effluent downstream of a rough cut separator and upstream of a cyclone separator.Type: GrantFiled: February 10, 1993Date of Patent: August 23, 1994Assignee: Stone & Webster Engineering Corp.Inventors: Robert J. Gartside, Richard C. Norton
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Patent number: 5324484Abstract: A catalytic cracking unit is disclosed which provides for separation and quenching of a catalytic cracking effluent.Type: GrantFiled: February 11, 1993Date of Patent: June 28, 1994Assignee: Stone & Webster Engineering Corp.Inventors: Robert J. Gartside, Richard C. Norton
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Patent number: 5280756Abstract: A method and system for controlling and providing guidance in reducing the level of NO.sub.x emissions based on controllable combustion parameters and model calculations while maintaining satisfactory plant performance and not causing other harmful consequences to the furnace. To implement such a system, boiler control values of flow, pressure, temperature, valve and damper positions in addition to emission sensors for data associated with the production of NO.sub.x, O.sub.2, CO, unburned carbon and fuel. This information is received from standard sensors located throughout a boiler which are connected either to a distributed control system (DCS), or another data acquisition system which is time coordinated with the DCS. The DCS passes this information to a computing device which then processes the information by model based optimization simulation programs, also referred to as the NO.sub.x Emissions Advisor.Type: GrantFiled: February 26, 1993Date of Patent: January 25, 1994Assignee: Stone & Webster Engineering Corp.Inventor: Donald E. Labbe
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Patent number: 5271827Abstract: An improved hydrocarbon pyrolysis process and apparatus for the production of ethylene comprising a novel furnace comprised of an unfired superheater radiant section and a fired radiant section, adiabatic tube reactor and quench boiler is provided.Type: GrantFiled: June 24, 1992Date of Patent: December 21, 1993Assignee: Stone & Webster Engineering Corp.Inventor: Herman N. Woebcke