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| Number | Title | Issue Date |
| 6015450 | Reducing methanol emissions from a syngas unit Methanol emissions in the CO2 vent from a synthesis gas unit in an ammonia or hydrogen plant are reduced by contacting raw synthesis gas from a low temperature shift converter with recycled stripped condensate to absorb methanol. The synthesis ... | 01/18/2000 |
| 6005011 | Process for converting gas to liquids A plant and process for converting associated gas from crude oil to methanol at or near the wellhead. The process uses partial oxidation of the associated gas, direct quench, liquid phase methanol conversion wherein substoichiometric H2 :CO is ... | 12/21/1999 |
| 5972208 | FCC metals passivation additives applied to catalyst A process and apparatus for incorporating additives into a circulating inventory of equilibrium catalyst in a fluid catalyst cracking (FCC) unit are disclosed. Hot regenerated catalyst is removed from the FCC regenerator, cooled, optionally subjected to m... | 10/26/1999 |
| 5958219 | Metals passivation by magnetic treatment to permit higher metals levels on FCC catalyst A process for metals passivation of metals-contaminated equilibrium catalyst (ECat) used in a fluidized catalytic cracking (FCC) process is disclosed. Repeated treatment of a slip stream of ECat in a high-strength magnetic field, preferably a magnetic cat... | 09/28/1999 |
| 5958218 | Two-stage hydroprocessing reaction scheme with series recycle gas flow Hydrocarbon feedstocks are hydroprocessed in parallel reactors, while hydrogen flows in series between the reactors. A first hydrocarbon feedstock and a hydrogen-rich recycle gas stream are introduced to a first reactor, where a first reactor effluent str... | 09/28/1999 |
| 5944981 | Pyrolysis furnace tubes An improved method for cracking a hydrocarbon feedstock comprising passing the feedstock through furnace tubes at high temperatures. The improvement comprises tubes comprised of a nickel-cobalt alloy containing: nickel; 27.0-33.0 weight percent cobalt; 26... | 08/31/1999 |
| 5878699 | Process furnace A twin-cell furnace for process stream preheat and utility steam superheat. The furnace uses a pair of vertical radiant cells with top supported, bottom guided, single row, multiple pass vertical coils fired on opposite sides by floor-mounted burners. An ... | 03/09/1999 |
| 5877384 | Apparatus and process for separating reaction effluent in the manufacture of cumene An apparatus and process for separating propane and benzene from alkylation reaction products in cumene production. An integrated fractionation tower combines the functions of propane separation, recycle benzene recovery as well as system dewatering to el... | 03/02/1999 |
| 5877380 | Quench oil viscosity control in pyrolysis fractionator The viscosity of quench oil circulated in a pyrolysis fractionation unit is controlled by contacting pyrolysis furnace effluent with a slip stream of 0.1-0.5 kg/kg of the quench oil, separating the resulting vapor-liquid mixture to remove tarry liquid, an... | 03/02/1999 |
| 5843303 | Direct fired convection heating in residuum oil solvent extraction process A residuum oil solvent extraction process is improved by using direct fired convection heaters for heating the asphaltene, the solvent-deasphalted oil phase, the deasphalted oil and the stripping steam, instead of hot oil heat exchangers. The convection h... | 12/01/1998 |
| 5773378 | Spent catalyst distribution A regenerator in a FCC unit, with the reactor elevated above the regenerator and a side entry spent catalyst introduction to the regenerator, is modified by installing a spent catalyst distribution apparatus along a central vertical axis of the regenerato... | 06/30/1998 |
| 5755933 | Partitioned distillation column An integrated distillation column having a partitioned stripping or absorption section is presented. The integrated stripping/distillation column comprises a single shell housing a refluxed absorption section and a reboiled stripping section. The strippin... | 05/26/1998 |
| 5744009 | Method and apparatus for recovering condensables in vapor from a urea vacuum evaporator An improved urea recovery process is presented. In the improved process, multiple vacuum rated surface condensers used to condense water vapor evolved during urea vacuum evaporation/concentration are replaced by a direct contact cooler/absorber to obtain ... | 04/28/1998 |
| 5736116 | Ammonia production with enriched air reforming and nitrogen injection into the synthesis loop A retrofit method for increasing production capacity of an ammonia plant having a front end including in series primary and secondary reformers and a shift converter for reacting a hydrocarbon feed, steam and air to form a make-up syngas stream comprising... | 04/07/1998 |
| 5709780 | Partitioned distillation column An integrated distillation column having a partitioned stripping or absorption section is presented. The integrated stripping/distillation column comprises a single shell housing a refluxed absorption section and a reboiled stripping section. The strippin... | 01/20/1998 |
| 5690168 | Quench exchanger A thermal transition section for introducing a high temperature cracked process gas into a quench exchanger having an inlet end comprising inner and outer concentric pipes connected to a closure ring to define an annulus between the pipes and an interior ... | 11/25/1997 |
| 5659109 | Method for removing mercaptans from LNG A process for liquefying natural gas containing mercaptans. Mercaptans are concentrated into a distillate stream by distilling the feed gas stream without specific pretreatment for mercaptans removal. Thus, the mercaptans removal equipment is much smaller... | 08/19/1997 |
| 5653282 | Shell and tube heat exchanger with impingement distributor An impingement distributor for a shell and tube heat exchanger and a method of recovering waste heat from a hot gas which minimizes adverse heat flux at the outermost banks of tubes for enhanced operational reliability. The impingement distributor has a c... | 08/05/1997 |
| 5635140 | Self-aerating spent catalyst distributor A spent catalyst distributor in a fluid catalytic cracking unit regenerator is self aerated by attaching to the underside of each trough arm a contiguous lip which captures rising aeration fluid and uses the aeration fluid to aerate spent catalyst flowing... | 06/03/1997 |
| 5578093 | Fluid bed desulfurization A method and apparatus for desulfurizing a gas and regenerating a sorbent is disclosed. The sulfur-containing feed gas which can be an effluent gas from a coal gasification reactor, for example, is desulfurized with a particulated metallic oxide sorbent i... | 11/26/1996 |
| 5560900 | Transport partial oxidation method Disclosed are a process for converting low value hydrocarbon streams to hydrogen and/or synthesis gas products and a transport reactor useful in the conversion process. In the transport reactor, carbon produced is deposited on a circulating inert particul... | 10/01/1996 |
| 5523483 | Integrated urea/ammonia process An integrated ammonia/urea process and a plant for carrying out the same. The process comprises recycling a high pressure purge stream made up mostly of air from the urea synthesis cycle to the autothermal reformer in a syngas production unit of the ammon... | 06/04/1996 |
| 5505049 | Process for removing nitrogen from LNG A process for removing nitrogen from liquefied natural gas (LNG) using an enhanced surface, reflux heat exchanger is disclosed. A relatively warm high pressure LNG stream is directed countercurrently in heat exchange with a cool low pressure LNG stream to... | 04/09/1996 |
| 5500094 | Coke drum deheading device A vessel unheading device and method especially suited to handle shot coke produced in a delayed coker unit of a petroleum refining process. The device includes a car having mounted thereon one or more bottom head retracting support members which can be l... | 03/19/1996 |
| 5490920 | Self-cleaning sedimentation unit A gravity sedimentation unit for thickening or clarifying a solids containing liquid is disclosed. The unit comprises a settling basin for receiving the feed and permitting the suspended solids to settle. A pump moves around the basin to discharge solids ... | 02/13/1996 |
| 5457625 | Maximizing process production rates using permanent constraints The present invention optimizes the relationship of variables associated with a process having inputs and outputs such that the process has controlled variables, manipulated variables, associated variables and disturbance variables, to maximize production... | 10/10/1995 |
| 5453559 | Hybrid condensation-absorption olefin recovery A hybrid condensation-absorption process and unit is disclosed for the recovery of olefins. A mixed-component stream containing hydrogen, methane and olefins is compressed and refrigerated against propylene refrigerant to partially condense the stream. Th... | 09/26/1995 |
| 5453177 | Integrated distillate recovery process An integrated three-column process for recovering hydrocarbon distillate products from a hydroprocessing or hydrocracking reactor effluent stream and a hydrocarbon distillate product recovery train are disclosed. According to the present recovery process,... | 09/26/1995 |
| 5447702 | Fluid bed desulfurization A method and apparatus for desulfurizing a gas and regenerating a sorbent is disclosed. The sulfur-containing feed gas which can be an effluent gas from a coal gasification reactor, for example, is desulfurized with a particulated metallic oxide sorbent i... | 09/05/1995 |
| 5447621 | Integrated process for upgrading middle distillate production An integrated middle distillate upgrading process and unit are disclosed. A middle distillate side-stream of a conventional single stage hydrocracking process is circulated to a hydrotreating stage such as an aromatics saturation reactor and/or a catalyti... | 09/05/1995 |
| 5421167 | Enhanced olefin recovery method An enhanced method is disclosed for recovering olefins from a cracking furnace effluent stream in an olefins plant. In accordance with this method, a liquid hydrocarbon stream, preferably obtained from the compressor area drier liquids and/or from the dee... | 06/06/1995 |
| 5387322 | Fusel oil stripping A method for recovering volatile components from reformer effluent condensate and fusel oil in a methanol plant is disclosed. The fusel oil is stripped with steam to produce an overhead vapor stream of steam and stripped organic components which is recycl... | 02/07/1995 |
| 5370844 | FCC disengagement apparatus A separator apparatus and method for a hydrocarbon fluidized catalytic cracking process are disclosed. The apparatus comprises a main plenum in a disengagement vessel which connects a plurality of riser cyclones in a riser catalyst separation stage to a p... | 12/06/1994 |
| 5362454 | High temperature heat exchanger A high temperature heat exchanger having an improved support apparatus for suspending a tube bundle. The improved support comprises a skirt from which the tube sheet and the bundle are supported, and a lip on an upper end of the skirt engaged in a flange ... | 11/08/1994 |
| 5346593 | Intermediate reboiler for a methanol plant A methanol refining column and method using an intermediate reboiler. Use of the intermediate reboiler reduces methanol production energy requirements. A side stream at or near a fusel oil takeoff point is heated in an intermediate reboiler by a low tempe... | 09/13/1994 |
| 5346133 | High temperature liquid injection apparatus A feed line to a pyrolysis furnace and a liquid injection apparatus for introducing a liquid coke inhibitor in the feed line are disclosed. The injection apparatus includes a central passageway for supplying the liquid coke inhibitor, an annular passagewa... | 09/13/1994 |
| 5335504 | Carbon dioxide recovery process A process for recovering CO2 from a mixture of light hydrocarbons, e.g. light hydrocarbons produced from a CO2 injection enhanced oil recovery. The mixture is distilled in a distributive zone with CO2 produced overhead and... | 08/09/1994 |
| 5325673 | Natural gas liquefaction pretreatment process A method for pretreating a natural gas stream using a single scrub column to remove freezable C5+ components and provide an LNG product which can be conveniently handled and shipped is disclosed. The method comprises feeding a natural gas stre... | 07/05/1994 |
| 5303769 | Integrated thermosiphon heat exchanger apparatus A thermosiphon reboiler heat exchanger which integrates multiple parallel reboilers into a single unit and a heating method are disclosed. The present heat exchanger utilizes a compartmentalized shell for vaporizing a tube-side liquid with a plurality of ... | 04/19/1994 |
| 5250270 | Catalytic reactor bed A fixed bed, dual-zone radial flow catalytic reactor is disclosed. In particular, the catalyst bed configuration includes a first freeboard outwardly radial flow catalyst zone in series with a second inwardly radial flow zone separated by an interconnecti... | 10/05/1993 |
