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Stone & Webster Engineering Corporation Patents
Assignee:
Stone & Webster Engineering Corporation
Address:
Boston, MA
No. of patents:
57
Patents:


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Patent Number Title Of Patent Date Issued
6235961 Process for pretreating cracked gas before caustic tower treatment in ehtylene plants May 22, 2001
An inline, high-shear mixer is provided in a cracked gas stream upstream of a caustic tower in an ethylene production unit. Spent caustic is withdrawn from the bottom of the caustic tower and pumped to the mixer, where the spent caustic mixes with and absorbs acid gas components from the
5885422 Spent caustic (pre)treatment process March 23, 1999
A process for pretreating a spent caustic stream prior to oxidation includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate containing only residual amounts of
5730859 Process for catalytically cracking paraffin rich feedstocks comprising high and low concarbon co March 24, 1998
A process for contemporaneously catalytically cracking a paraffin rich feedstock and a heavy feedstock wherein the feedstocks are segregated prior to catalytic cracking in separate reactors with regenerated particulate catalyst solids. The process provides for the separate optimal cr
5723040 Fluid catalytic cracking process and apparatus March 3, 1998
The present invention provides a method for improving the contacting of feedstock and regenerated catalytic particulates in certain fluid catalytic cracking processes and apparatus.
5662868 Short residence time cracking apparatus and process September 2, 1997
A novel apparatus and process for the cracking of hydrocarbons is disclosed which is particularly useful in revamping an existing FCC unit to a short residence time FCC unit.
5571482 Apparatus for controlling catalyst temperature during regeneration November 5, 1996
A catalyst cooler apparatus and process for use with a two-stage regeneration system in a fluidized catalytic cracking process having a device to remove hot catalyst from the second regeneration zone at a point above the air distribution ring under the surface of the catalyst bed equ
5565176 Catalytically cracking paraffin rich feedstocks comprising high and low concarbon components October 15, 1996
An apparatus for contemporaneously catalytically cracking a paraffin rich feedstock and a heavy feedstock wherein the feedstocks are segregated prior to catalytic cracking in separate reactors with regenerated particulate catalyst solids. The apparatus provides for the separate optim
5435906 Process for catalytically cracking feedstocks paraffin rich comprising high and low concarbon co July 25, 1995
A process for contemporaneously catalytically cracking a paraffin rich feedstock and a heavy feedstock wherein the feedstocks are segregated prior to catalytic cracking in separate reactors with regenerated particulate catalyst solids. The process provides for the separate optimal cr
5414170 Mixed phase front end C.sub.2 acetylene hydrogenation May 9, 1995
The present invention provides an improved process for selectively hydrogenating acetylenes in an olefin plant process stream by selectively hydrogenating the acetylenes downstream of a front end depropanizer and upstream of further separation zones such as a demethanizer and/or de-e
5320741 Combination process for the pretreatment and hydroconversion of heavy residual oils June 14, 1994
A novel method is disclosed for the hydroconversion of a heavy hydrocarbon feedstock wherein the feed is partially hydroconverted and demetalized in the presence of a catalytic additive and then the hydroconversion is completed in an ebullent bed reactor system.
5254318 Lined reformer tubes for high pressure reformer reactors October 19, 1993
A reformer tube assembly for use in reformer reactors including a ceramic tube having an open top end and a closed bottom end, a corrosive resistant liner for the ceramic tube also having an open top end and closed bottom end and a centrally disposed metal tube having an open top end and
5220093 Process for production of olefins from mixtures of light paraffins June 15, 1993
Process for catalytic dehydrogenation of a mixture of light paraffins including passing accelerated catalyst with an acceleration gas into a mixing zone for contact with mixed paraffin feedstock, passing the feedstock/catalyst into a reaction zone, separating the effluent from the sp
5151158 Thermal cracking furnace September 29, 1992
A thermal cracking furnace comprising horizontally disposed and vertically disposed radiant tube sections.
5114682 Apparatus for recovering heat energy from catalyst regenerator flue gases May 19, 1992
An improved fluidized catalytic cracking-catalyst regeneration process for catalytically cracking heavy hydrocarbon feedstocks is provided which comprises first and second, relatively lower and higher temperature, catalyst regeneration zones, wherein CO-rich effluent flue gas from the
5087349 Process for selectively maximizing product production in fluidized catalytic cracking of hydroca February 11, 1992
An improved process for controlling desired product distribution in fluidized catalytic cracking of olefins is provided wherein riser reactor temperature profiles are controlled by means of atomized quench streams provided downstream of the hydrocarbon feedstock charge level.
5076930 Apparatus and process for liquid-liquid contact December 31, 1991
A process and apparatus for effecting liquid-liquid contact in a plurality of stages between heavy and light liquid streams is provided wherein said streams are capable of undergoing mass transfer with one another or constituents in either stream are capable of reaction therebetween and
5037617 Apparatus for the return of particulate solids through a cyclone separator to a vessel August 6, 1991
An apparatus and process for transferring and regulating the recycle of particulate solids separated from a gas-particulate solids suspension in which an auxiliary vessel and slanted pipe are provided to transfer and regulate particulate solids flow.
5035732 Cryogenic separation of gaseous mixtures July 30, 1991
A cryogenic technique for recovering ethene from a gaseous mixture containing methane, ethane, etc. Operating methods and apparatus are provided for passing the gas feed through a chilling train having a series of dephlegmator-type exchange units to condense liquid rich in ethene and
5009769 Process for catalytic cracking of hydrocarbons April 23, 1991
An improved process and apparatus is provided for simultaneously, independently catalytically cracking dissimilar hydrocarbon feedstocks at elevated temperatures in separate riser reactors and under respective operating parameters which permit selective conversion to desired products
5006131 Apparatus for production of synthesis gas using convective reforming April 9, 1991
A convective reformer device is provided which is useful for partially reforming a feed mixture of hydrocarbons and steam. The device includes an outer shell enclosure and a tubular inner core assembly and is specifically adapted to support heat exchange between a heating fluid, whic
4986956 Passive nuclear power plant containment system January 22, 1991
A closed passive nuclear reactor pressure suppression containment system segrated from the nuclear island having suppression tanks connected to the reactor compartment by one or more vent lines terminating in downcomer lines submerged into a water pool in each of said suppression tanks a
4909981 Nuclear reactor March 20, 1990
A novel liquid nuclear reactor is described which comprises a reactor vessel that is connected through upper and lower liquid conduit means to one or more satellite tanks that contain a heat exchanger means and pump means.
4906442 Process and apparatus for the production of olefins from both heavy and light hydrocarbons March 6, 1990
The invention is a pyrolysis furnace for cracking heavy oils to olefins. The furnace includes a convection zone and a radiation zone. In parallel streams, the heavy stream and a stream diluent are heated in the convection zone to the point of partial thermal cracking while in the oth
4904455 Production of synthesis gas using convective reforming February 27, 1990
A convective reformer device is provided which is useful for partially reforming a feed mixture of hydrocarbons and steam. The device includes an outer shell enclosure and a tubular inner core assembly and is specifically adapted to support heat exchange between a heating fluid, whic
4904372 Process and apparatus for recovering heat energy from catalyst regenerator flue gases February 27, 1990
An improved fluidized catalytic cracking-catalyst regeneration process for catalytically cracking heavy hydrocarbon feedstocks is provided which comprises first and second, relatively lower and higher temperature, catalyst regeneration zones, wherein CO-rich effluent flue gas from the
4824658 Production of synthesis gas using convective reforming April 25, 1989
A convective reformer device is provided which is useful for partially reforming a feed mixture of hydrocarbons and steam. The device includes an outer shell enclosure and a tubular inner core assembly and is specifically adapted to support heat exchange between a heating fluid, whic
4814067 Particulate solids cracking apparatus and process March 21, 1989
A process for cracking hydrocarbon with hot particulate solids wherein a curtain of hot particulate solids is delivered to a thermal reactor through peripheral openings and hydrocarbon feed is delivered to the reactor through the curtain of hot particulate solids at an angle.
4765948 Coolant circulation system for a liquid metal nuclear reactor August 23, 1988
A liquid metal circulation system is disclosed which is suitable for use in connection with a nuclear reactor. The circulation system of the invention includes an electromagnetic pump having a central core body featuring a helically configured, six pole magnet, optionally directing flow
4765883 Process for the production of aromatics benzene, toluene, xylene (BTX) from heavy hydrocarbons August 23, 1988
A process for producing improved yields of aromatics (benzene, toluene, xylene) by initially partially thermally cracking heavy hydrocarbon and thermally cracking ethane to high conversion and then completely cracking the partially cracked heavy hydrocarbon with the completely cracked
4756886 Rough cut solids separator July 12, 1988
A gas-solids separator to remove particulate solids from a mixed phase stream of solids and gas which has a frusto-conical chamber having substantially conical walls tapering downwardly and outwardly and means defining at least one opening in said conical walls for conveying through
4753773 Double tube steam generator June 28, 1988
A double tube modular coil steam generator is provided in which a multiplicity of inner tubes conducting water are individually surrounded by outer tubes containing liquid metal as a heat transfer agent. The double tubes form into coils, providing a large surface area while conservin
4737337 Nuclear reactor having double tube helical coil heat exchanger April 12, 1988
A nuclear reactor is provided characterized by a circulating liquid metal cooling system comprising a heat exchanger having a closed intermediate heat transfer fluid circuit in the form of a helical coil juxtaposed with the liquid metal coolant system, which effectively transfers heat th
4732740 Integrated heavy oil pyrolysis process March 22, 1988
An apparatus for the cracking of a heavy hydrocarbon feedstock comprising a pre-pyrolysis cracker for treating the feedstock at elevated temperatures and pressures; a primary separator for separating the effluent from the pre-pyrolysis cracker into a heavy fuel oil fraction and a treated
4615795 Integrated heavy oil pyrolysis process October 7, 1986
A process and system for the production of olefins from heavy hydrocarbon feedstocks. A heavy hydrocarbon feed is first pretreated at high pressure and moderate temperatures to preferentially remove coke precursors in a liquid product. The pretreated hydrocarbon is then separated into li
4585544 Hydrocarbon pretreatment process for catalytic cracking April 29, 1986
A process for pretreating residual oil by thermal regenerative vaporizing and pretreatment at short residence times and catalytically cracking the pretreated effluent from the thermal regenerative pretreatment process.
4556541 Low residence time solid-gas separation device and system December 3, 1985
An apparatus and method embodied in a TRC system for rapidly separating particulate solids from a mixed phase solids-gas stream which may be at velocities up to 150 ft./sec. and at high temperature. Specifically, the device is designed for incorporation at the discharge of solid-gas
4552645 Process for cracking heavy hydrocarbon to produce olefins and liquid hydrocarbon fuels November 12, 1985
A process for cracking heavy hydrocarbon feedstocks by separation into light and heavy fractions and concommitantly thermally cracking the light fraction and coking the heavy fraction.
4552644 Duocracking process for the production of olefins from both heavy and light hydrocarbons November 12, 1985
The invention is a method for cracking heavy oils to olefins. In parallel streams, the heavy stream and a steam diluent are heated to the point of partial thermal cracking while in the other stream a lighter oil and steam are cracked to produce olefins. The hot, olefinic light stream is
4544480 Low residence time solid-gas separation process October 1, 1985
This invention relates to an apparatus and method embodied in a TRC system for rapidly separating particulate solids from a mixed phase solids-gas stream which may be at velocities up to 150 ft./sec. and at high temperature. Specifically, the device is designed for incorporation at the
4390502 Solids feeding device and system June 28, 1983
The present invention is an apparatus continuously feeding particulate solids to a TRC reaction chamber or zone at a controlled rate of flow, and for admixing the solids with fluid simultaneously introduced to the reaction zone. This invention utilized one or more conduits, preferably
4352728 Solids feeding device and system October 5, 1982
In a TRC process and system, an improved process and system for regulating the rate of solids added continuously to a solids-fluid reaction system, the solids participating in the reaction as a reactant, catalyst, or inert heat supply medium.
4338187 Solids feeding device and system July 6, 1982
An apparatus and process for delivering fluidization gas to a bed of particulate solids to selectively locally fluidize the solids above a delivery conduit in communication with a reaction chamber. Also an apparatus and process for intimately mixing hydrocarbon feed with the particul
4309272 Sequential thermal cracking process January 5, 1982
A process and system for sequentially cracking hydrocarbons in a TRC system. A first hydrocarbon feed is cracked at high severity low residence times and the cracked effluent is quenched by a second hydrocarbon feed which is coincidentally cracked at low severity.
4288235 Low residence time solid-gas separation device and system September 8, 1981
This invention relates to an apparatus and method for rapidly separating particulate solids from a mixed phase solids-gas stream which may be at velocities up to 150 ft./sec. and at high temperature. Specifically, the device is designed for incorporation at the discharge of solid-gas
4203742 Process for the recovery of ethane and heavier hydrocarbon components from methane-rich gases May 20, 1980
A process is disclosed for the recovery of ethane and heavier hydrocarbons from a methane-rich gas utilizing an expander, a high pressure demethanizer tower with flashed and expanded vapor and liquid streams, as coolants in heat exchange relationship with the processed hydrocarbon va
4191845 Process for converting unsaturated C.sub.4 hydrocarbons into normal butane March 4, 1980
Unsaturated C.sub.4 hydrocarbons are converted into normal butane by introducing an unsaturated C.sub.4 hydrocarbon stream into a hydrogenation zone to convert it into a stream of normal butane and isobutane. Normal butane is recovered from a separation zone while isobutane is directed t
4143521 Process for the production of ethylene March 13, 1979
A process for the production of ethylene wherein low-level waste heat released during ethylene production is utilized in an ammonia absorption refrigeration system to generate a refrigerant, which refrigerant is used for cooling various process streams thereby reducing the energy req
4141825 Desalination process system and by-product recovery February 27, 1979
A desalination process system combining electro-dialysis, reverse osmosis and brine concentration with by-product recovery.
4101118 Impact energy absorbing pipe restraints July 18, 1978
Impact energy absorbing pipe restraints are provided which include a laminated strap for surrounding at least a portion of the circumference of a high energy pipe to restrain the movement of the high energy pipe in at least one direction during rupture. The laminated strap is formed of a
4101117 Impact energy absorbing pipe restraints July 18, 1978
Impact energy absorbing pipe restraints are provided which include a laminated strap for surrounding at least a portion of the circumference of a high energy pipe to restrain the movement of the high energy pipe in at least one direction during rupture. The laminated strap is formed of a
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