Patents Represented by Attorney, Agent or Law Firm Stanley Ktorides
  • Nitrogen system for regenerating chemical solvent
    Patent number: 6174348
    Abstract: A system for regenerating chemical solvent loaded with acid gas with improved energy efficiency wherein the chemical solvent is partially flash vaporized, heated, and passed in countercurrent mass transfer contact with nitrogen gas.
    Type: Grant
    Filed: August 17, 1999
    Date of Patent: January 16, 2001
    Assignee: Praxair Technology, Inc.
    Inventors: M. Mushtaq Ahmed, Minish Mahendra Shah, Raymond Francis Drnevich
  • Multiple coherent jet lance
    Patent number: 6171544
    Abstract: A system for establishing a plurality of coherent gas jets proximate one another using a single lance wherein plurality of gas jets are ejected from a corresponding plurality of nozzles in a lance and a flame envelope is established around the plurality of gas jets, and the jets remain distinct and do not coalesce for their length.
    Type: Grant
    Filed: April 2, 1999
    Date of Patent: January 9, 2001
    Assignee: Praxair Technology, Inc.
    Inventors: John Erling Anderson, Dennis Robert Farrenkopf, Richard Thomas Semenza, Pravin Chandra Mathur, William John Mahoney
  • Carbon dioxide recovery with composite amine blends
    Patent number: 6165433
    Abstract: A method for recovering carbon dioxide by absorption of carbon dioxide from a gas stream into a composite recovery solvent comprising preferably a lesser concentration of one or more fast reaction rate amines and a greater concentration of one or more slow reaction rate amines.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: December 26, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Shrikar Chakravarti, Amitabh Gupta
  • System for recovering carbon dioxide from a lean feed
    Patent number: 6146603
    Abstract: A system for recovering absorbate such as carbon dioxide using an alkanolamine absorbent fluid, wherein the loaded absorbent is heated in a two step heating procedure prior to the separation of the absorbate from the absorbent, and wherein the loaded absorbent is deoxygenated after the first heating step and prior to the second heating step.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: November 14, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Shrikar Chakravarti, Amitabh Gupta
  • Method for changing the length of a coherent jet
    Patent number: 6142764
    Abstract: A method for changing the length of a coherent jet by establishing a coherent jet using a flame envelope generated using gaseous fuel and changing the flowrate of the gaseous fuel, preferably using inert gas for make up to maintain a constant total flowrate of fuel and inert gas.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: November 7, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: John Erling Anderson, Balu Sarma, William John Mahoney
  • System for producing a single coherent jet
    Patent number: 6139310
    Abstract: A system for establishing a single coherent gas jet from a plurality of initial gas jets ejected from a single lance wherein the initial gas jets are themselves coherent, are angled inward, and are surrounded by a flame envelope. The initial coherent gas jets merge to form a single coherent jet and the gases of the initial gas jets do not substantially interact within this single coherent jet for the length of the resulting single coherent gas jet.
    Type: Grant
    Filed: November 16, 1999
    Date of Patent: October 31, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: William John Mahoney, John Erling Anderson
  • Cryogenic rectification method for producing nitrogen gas and liquid nitrogen
    Patent number: 6125656
    Abstract: A cryogenic rectification method wherein both nitrogen gas and liquid are efficiently produced from air employing one or two columns wherein refrigeration to drive the cryogenic separation is provided by a, preferably closed loop, multicomponent refrigerant fluid refrigeration circuit.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: October 3, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Bayram Arman, Dante Patrick Bonaquist, Joseph Alfred Weber, John Harold Ziemer, Arun Acharya, Mohannad Abdul-Aziz Rashad
  • Cryogenic rectification system and hybrid refrigeration generation
    Patent number: 6112550
    Abstract: A system for generating refrigeration and providing the refrigeration into a cryogenic rectification plant wherein, in addition to refrigeration generated by turboexpansion, further refrigeration for the plant is generated by a recirculating multicomponent refrigerant in a refrigeration circuit.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: September 5, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Dante Patrick Bonaquist, Bayram Arman, Joseph Alfred Weber, Walter Joseph Olszewski, Mark Edward Vincett
  • Multiple circuit cryogenic liquefaction of industrial gas
    Patent number: 6105388
    Abstract: A method for more efficiently cooling and liquefying industrial gas wherein refrigeration for the cooling and liquefaction is generated using first and second defined multicomponent refrigerant fluids in separate refrigeration circuits to cover a wide temperature range from ambient to cryogenic temperature.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: August 22, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Arun Acharya, Bayram Arman, Joseph Alfred Weber, Vijayaraghavan Srinivasan, Jeffert John Nowobilski, James Smolarek, Neno Todorov Nenov
  • Cryogenic rectification system with high strength and high capacity packing
    Patent number: 6101841
    Abstract: A cryogenic rectification system and a packing module and column suitable for cryogenic rectification having packing sheets with top and bottom modifications in alternating sequence and preferably having top and bottom edges terminating in planes wherein capacity and mass transfer efficiency is enhanced and mechanical strength is not compromised.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: August 15, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: John Fredric Billingham, Michael James Lockett
  • Coherent jet injector lance
    Patent number: 6096261
    Abstract: A lance which may be used to establish a long coherent gas jet which includes a primary passageway having a converging/diverging nozzle, and two radially spaced secondary passageways for establishing a flame barrier, each of the passageways communicating with an injection space defined by a protective jacket.
    Type: Grant
    Filed: November 20, 1997
    Date of Patent: August 1, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: John Erling Anderson, Pravin Chandra Mathur, Ronald Joseph Selines
  • Hot oxygen blast furnace injection system
    Patent number: 6090182
    Abstract: A method for providing a blast stream into a blast furnace wherein fuel and hot oxygen are provided into the blast air, the hot oxygen being at a temperature and velocity each greater than that of the blast air, and wherein the fuel and hot oxygen begin to combust prior to passage into the blast furnace in the blast stream.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: July 18, 2000
    Assignee: Praxair Technology, Inc.
    Inventor: Michael Francis Riley
  • Cryogenic air separation system for producing moderate purity oxygen and moderate purity nitrogen
    Patent number: 6079223
    Abstract: A cryogenic air separation system wherein feed air is initially processed to produce a vapor and a liquid, the vapor is then processed in the rectifying section of a reflux condenser to produce moderate purity nitrogen, and the liquid is processed in the stripping section of the reflux condenser to produce moderate purity oxygen.
    Type: Grant
    Filed: May 4, 1999
    Date of Patent: June 27, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Vijayaraghavan Srinivasan, Minish Mahendra Shah, Andrew Chun-Pong Lau, Michael James Lockett
  • Variable load refrigeration system particularly for cryogenic temperatures
    Patent number: 6076372
    Abstract: A method for generating refrigeration, especially over a wide temperature range including cryogenic temperatures, wherein a non-toxic, non-flammable and low or non-ozone-depleting mixture is formed from defined components and maintained in variable load form through compression, cooling, expansion and warming steps in a refrigeration cycle.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: June 20, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Arun Acharya, Bayram Arman, Walter Joseph Olszewski, Dante Patrick Bonaquist, Joseph Alfred Weber
  • Cryogenic air separation system for producing elevated pressure oxygen
    Patent number: 6073462
    Abstract: A cryogenic air separation system employing a double column wherein lower pressure column bottom liquid is pressurized in a single cryogenic liquid pump to provide driving fluid for the main condenser and to provide product elevated pressure oxygen.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: June 13, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Kenneth Kai Wong, Dante Patrick Bonaquist, James Bragdon Wulf
  • Distillation system for producing carbon dioxide
    Patent number: 6070431
    Abstract: A distillation system for producing carbon dioxide, particularly from a feed which contains significant levels of light components, wherein the feed is at least partially condensed upstream of the distillation by indirect heat exchange with a multicomponent heat exchange fluid recirculating in a closed refrigeration loop, and/or the overhead from the distillation is condensed for reflux by indirect heat exchange with a multicomponent heat exchange fluid recirculating in a closed refrigeration loop.
    Type: Grant
    Filed: February 2, 1999
    Date of Patent: June 6, 2000
    Assignee: Praxair Technology, Inc.
    Inventor: Henry Edward Howard
  • Multicomponent refrigerant cooling with internal recycle
    Patent number: 6065305
    Abstract: A system for cooling a fluid particularly to a cryogenic temperature wherein a multicomponent refrigerant fluid is partially condensed, the liquid used to generate refrigeration to cool the product by recycle into an upstream portion of the warming leg of the refrigeration circuit, and the vapor, having a different composition than the liquid, is used to generate refrigeration at a colder temperature for further cooling of the product.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: May 23, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Bayram Arman, Walter Joseph Olszewski, Joseph Alfred Weber, Dante Patrick Bonaquist, Arun Acharya, John Henri Royal
  • Method for carrying out subambient temperature, especially cryogenic, separation using refrigeration from a multicomponent refrigerant fluid
    Patent number: 6053008
    Abstract: A method for low temperature separation of fluids wherein the separation process is sustained by refrigeration generated by a recirculating multicomponent refrigerant fluid.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: April 25, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Bayram Arman, Dante Patrick Bonaquist, Joseph Alfred Weber, Mark Edward Vincett
  • Method for integrating a blast furnace and a direct reduction reactor using cryogenic rectification
    Patent number: 6045602
    Abstract: A method for increasing iron production by integrating blast furnace ironmaking with direct reduction ironmaking wherein cryogenic rectification links the two systems and produces input materials for both.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: April 4, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Minish Mahendra Shah, Raymond Francis Drnevich
  • Heat exchange unit for a cryogenic air separation system
    Patent number: 6044902
    Abstract: A heat exchanger having a first counterflow heat exchange unit with first and second segments wherein a flow of at least one product from a cryogenic air separation unit is channeled in a first direction along both the first and second segments and a second counterflow heat exchange unit is juxtaposed to the second segment of the first counterflow heat exchange unit and receives a flow of feed air which is channeled in a second direction that is counter to the first direction and allows heat exchange between the product and the air. A crossflow subcooling unit is juxtaposed to the first segment and receives at least one process cryogenic liquid from the air separation system for subcooling.
    Type: Grant
    Filed: August 20, 1997
    Date of Patent: April 4, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Ravi Fulchand Pahade, Bayram Arman, Michael James Lockett