Patents Assigned to Praxair Technology, Inc.
  • Patent number: 10385861
    Abstract: A method for compression of an incoming feed air stream using at least two variable speed compressor drive assemblies controlled in tandem is provided. The first variable speed drive assembly drives at least one compression stage in the lower pressure compressor unit driven while the second variable speed drive assembly drives higher pressure compression stage disposed either in the common air compression train or the split functional compression train of the air separation plant. The first and second variable speed drive assemblies are preferably high speed, variable speed electric motor assemblies each having a motor body, a motor housing, and a motor shaft with one or more impellers directly and rigidly coupled to the motor shaft via a sacrificial rigid shaft coupling.
    Type: Grant
    Filed: October 15, 2015
    Date of Patent: August 20, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Nick J. Degenstein, Lee J. Rosen, Ahmed F. Abdelwahab, Carl L. Schwarz, Reh-Lin Chen, Henry E. Howard
  • Patent number: 10384183
    Abstract: The present invention relates a steam methane reformer tube outlet assembly and a method of assembling or retrofitting same. More specifically, it relates to an exposed flanged tube outlet of a reformer designed to mitigate metal dusting corrosion, dew point condensation-related metal fatigue and cracking, and over-temperature induced metal failures such as hydrogen attack.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: August 20, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Kwamina Bedu-Amissah, Troy M Raybold, Bobby L Ranson
  • Patent number: 10359231
    Abstract: A method for controlling production of high pressure gaseous oxygen in a cryogenic air separation unit that uses a high pressure gaseous oxygen bypass together with adjustments to the split of the incoming compressed and purified air between the boiler air circuit and the turbine air circuit such that the volumetric ratio of the boiler air stream to the turbine air stream is reduced to between about 0.15:1 and 0.35:1.
    Type: Grant
    Filed: April 12, 2017
    Date of Patent: July 23, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventor: Nick J. Degenstein
  • Patent number: 10337792
    Abstract: A system and method for producing argon that uses a higher pressure column, a lower pressure column, and an argon column collectively configured to produce nitrogen, oxygen and argon products through the cryogenic separation of air. The present system and method also employs a once through argon condensing assembly that is disposed entirely within the lower pressure column that is configured to condense an argon rich vapor stream from the argon column against the oxygen-enriched liquid from the higher pressure column to produce an argon liquid or vapor product. The control system is configured for optimizing the production of argon product by ensuring an even flow split of the oxygen-enriched liquid is distributed to the argon condenser cores and by adjusting the flow rate of the argon removed from the argon condensing assembly to maintain the liquid/vapor balance in the argon condensing assembly within appropriate limits.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: July 2, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Neil M. Prosser, Karl K. Kibler, Maulik R. Shelat
  • Patent number: 10330260
    Abstract: A method, as well as a system, are disclosed for filling a container with an amount of liquid carbon dioxide (CO2) which is partially converted into an amount of solid CO2 in the container, for maintaining one or more products, loaded into the container, at a defined temperature, below a defined temperature, or within a defined temperature range, the defined temperature or the defined temperature range being below an environmental temperature. Also disclosed are a method and a system for providing identification and traceability data determining the container and the one or more products that have been loaded into the container, and for enabling identification of the container during transport to a particular destination.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: June 25, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Jérôme Kermaidic, Nathalie Brixy
  • Patent number: 10315846
    Abstract: A novel method for storing high purity hydrogen into a salt cavern is provided. Particularly, the storage process involves confining the high purity hydrogen at a certain pressure in a salt cavern without seepage or leakage of the stored hydrogen through the salt cavern walls. The pressure in the cavern is maintained during storage of the high purity hydrogen.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: June 11, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventor: Rommel M. Oates
  • Patent number: 10309720
    Abstract: A system and method for argon and nitrogen extraction from a feed stream comprising hydrogen, methane, nitrogen and argon, such as a low-pressure tail gas of an ammonia production plant is provided. The disclosed system and method provides for a rectification system wherein an argon depleted gaseous stream and a methane rich liquid stream are produced and subsequently combined in whole or in part prior to vaporization. Nitrogen and argon containing streams may also be produced from the rectification system. An argon stripping column arrangement is also disclosed where residual argon is removed from the methane-rich fuel gas and recycled back to the feed stream.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: June 4, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventor: Henry E. Howard
  • Patent number: 10309721
    Abstract: A system and method for argon and nitrogen extraction from a feed stream comprising hydrogen, methane, nitrogen and argon, such as tail gas of an ammonia production plant is provided. The disclosed system and method provides for nitrogen-argon rectification and the methane rejection within a column system comprised of at least one distillation column. Nitrogen and argon are further separated and to produce liquid products. An argon stripping column arrangement is disclosed where residual argon is further removed from the methane-rich fuel gas and recycled back to the feed stream.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: June 4, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventor: Henry E. Howard
  • Patent number: 10294102
    Abstract: The present invention relates to a method of reducing a catalyst utilized in a hydrogen plant. More specifically, the invention relates the reduction of a catalyst employed in the steam methane reformer.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: May 21, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Andrew M Warta, Troy M Raybold, David R Barnes, Jr.
  • Patent number: 10295255
    Abstract: An adsorption process for xenon recovery from a cryogenic liquid or gas stream is described wherein a bed of adsorbent is contacted with the aforementioned xenon containing liquid or gas stream and adsorbs the xenon selectively from this fluid stream. The adsorption bed is operated to at least near full breakthrough with xenon to enable a deep rejection of other stream components, prior to regeneration using the temperature swing method. Operating the adsorption bed to near full breakthrough with xenon, prior to regeneration, enables production of a high purity product from the adsorption bed and further enables oxygen to be used safely as a purge gas, even in cases where hydrocarbons are co-present in the feed stream.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: May 21, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Philip A. Barrett, Neil A. Stephenson, Nicholas R. Stuckert, Michael Freiert, Hai Du, Rachael A. Masin, Garrett R. Swindlehurst
  • Patent number: 10295252
    Abstract: A system and method for providing refrigeration to a cryogenic separation unit is provided. The disclosed system and associated methods employ both a warm recycle turbine arrangement and cold turbine arrangement to provide the refrigeration required to produce a large amount of liquid products, such as liquid oxygen, liquid nitrogen and liquid argon when used in a cryogenic air separation unit.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: May 21, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventor: Henry E. Howard
  • Patent number: 10295254
    Abstract: A system and method for recovery of rare gases such as neon, helium, xenon, and krypton in an air separation unit is provided. The rare gas recovery system comprises a non-condensable stripping column linked in a heat transfer relationship with a xenon-krypton column via an auxiliary condenser-reboiler. The non-condensable stripping column produces a rare gas containing overhead that is directed to the auxiliary condenser-reboiler where most of the neon is captured in a non-condensable vent stream that is further processed to produce a crude neon vapor stream that contains greater than about 50% mole fraction of neon with the overall neon recovery exceeding 95%. The xenon-krypton column further receives two streams of liquid oxygen from the lower pressure column and the rare gas containing overhead from the non-condensable stripping column and produces a crude xenon and krypton liquid stream and an oxygen-rich overhead.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: May 21, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Vijayaraghavan S. Chakravarthy, Hanfei Tuo, Maulik R. Shelat, James R. Dray, Nick J. Degenstein
  • Patent number: 10295452
    Abstract: A system that provides for the measurement and control of proppant concentration in a liquefied gas fluid stream utilizing a non-nuclear optical detection device such as a near-infrared (NIR), visible (Vis), and ultraviolet (UV) photometer/nephelometer to be used in the fracture treatment of subterranean hydrocarbon formations.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: May 21, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventor: William J. Scharmach
  • Patent number: 10295251
    Abstract: A system and method for cryogenic purification of a hydrogen, nitrogen, methane and argon containing feed stream to produce a methane free, hydrogen and nitrogen containing synthesis gas and a methane rich fuel gas, as well as to recover an argon product stream, excess hydrogen, and excess nitrogen is provided. The disclosed system and method are particularly useful as an integrated cryogenic purifier in an ammonia synthesis process in an ammonia plant. The excess nitrogen is a nitrogen stream substantially free of methane and hydrogen that can be used in other parts of the plant, recovered as a gaseous nitrogen product and/or liquefied to produce a liquid nitrogen product.
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: May 21, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventor: Henry E. Howard
  • Patent number: 10273178
    Abstract: A glassmelting furnace is provided in which the burners are elevated above the glassmelt surface and are oriented at an angle upwards relative to the glassmelt surface.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: April 30, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Osemwengie Uyi Iyoha, Hisashi Kobayashi, Euan J. Evenson
  • Patent number: 10274375
    Abstract: A method for measuring furnace temperatures. The method includes obtaining radiance measurements from a plurality of regions of interest (ROIs) using a plurality of thermal imaging cameras, and measuring a surface temperature using a radiance measurement obtained from an ROI selected from the plurality of ROIs. Measuring the surface temperature includes determining an effective background radiance affecting the selected ROI using radiance measurements obtained from ROIs different from the selected ROI, obtaining a compensated radiance by removing the effective background radiance from the radiance measurement obtained from the selected ROI, and converting the compensated radiance to the measured surface temperature.
    Type: Grant
    Filed: April 1, 2016
    Date of Patent: April 30, 2019
    Assignees: LumaSense Technologies Holdings, Inc., Praxair Technology, Inc.
    Inventors: Tim Dubbs, John Leonard Shaver, Kreg James Kelley, Troy M. Raybold, Tushar Vispute
  • Patent number: 10254040
    Abstract: A system and method for separating air in an air separation plant is provided. The disclosed systems and methods divert a portion of the compressed, purified air stream to a bypass system configured to selectively produce a higher pressure compressed output stream or a lower pressure compressed output stream. The higher pressure and/or lower pressure compressed output streams are cooled in a main heat exchanger by indirect heat transfer with a plurality of product streams from the air separation plant and then rectified in the distillation column system. A second portion of the compressed, purified air stream is partially cooled in the main heat exchanger and expanding in a turbo-expander to produce power and an exhaust stream which is directed to the distillation column system of the air separation plant where it imparts additional refrigeration generated by the expansion of the compressed air stream in the turbo-expander.
    Type: Grant
    Filed: January 5, 2017
    Date of Patent: April 9, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Jeremiah J. Rauch, Sophia J. Dowd, Andrew M. Warta, Catherine B. Sarigiannis, Wei Zhang
  • Patent number: 10247471
    Abstract: An argon reflux condensation system and method in which a plurality of once-through condensers are connected to an argon column of an air separation plant to condense argon-rich vapor streams for production of reflux to the argon column. Condensation of the argon-rich vapor streams is brought about through indirect heat exchange with crude liquid oxygen streams that partially vaporize and are introduced into a lower pressure column of the plant for further refinement. The flow rate of the crude liquid oxygen streams are sensed and controlled at locations in the air separation plant where the crude liquid oxygen is in a liquid state and in proportion to the size of the once-through heat exchangers. Prior to flowing into the once-through condensers, the partially vaporized crude oxygen stream enters a phase separator which separates the crude oxygen vapor from the crude liquid oxygen.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: April 2, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: James R. Handley, Brian S. Powell, Henry E. Howard, Vijayaraghavan S. Chakravarthy, Maulik R. Shelat, Steven R. Falta
  • Patent number: 10233384
    Abstract: A composition and method required for providing a fracturing fluid pumped down a well bore and into a subterranean formation under conditions of pressure that will fracture the subterranean formation is described. More specifically, the composition increases the recovery of hydrocarbons from a geological formation penetrated by a well bore, wherein the composition includes a fracturing fluid that is liquid carbon dioxide (LCO2) with proppant to aid transport of the proppant in suspension, and thereby create a fracture using a fracturing fluid which is the thickened composition containing fumed silica. When the composition is without a proppant, the viscosity of the composition is increased in order to improve the fracturing operation through aspects such as increased fracture width and reduced fluid leak-off.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: March 19, 2019
    Assignee: Praxair Technology, Inc.
    Inventors: Richard M. Kelly, Walter L. Renz
  • Patent number: 10227856
    Abstract: The present disclosure is directed to a composition and method of fracturing a formation penetrated by a well-bore. The composition and method comprises providing a fracturing fluid that is liquefied carbon dioxide (LCO2) with at least one friction reducing polymer that is a polysiloxane dissolved in the LCO2 at a concentration of about 0.001 to 1.0 weight percent, and a first at least one co-solvent, and optionally a second at least one co-solvent that has a closed cup flash point greater than the first at least one co-solvent, in order to enable dissolution of the polymer in order to effect friction reduction.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: March 12, 2019
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Richard M. Kelly, William J. Scharmach, Walter L. Renz