Patents by Inventor Ravindra F. Pahade

Ravindra F. Pahade has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cryogenic rectification system with improved oxygen recovery
    Patent number: 5163296
    Abstract: A cryogenic rectification system wherein nitrogen top vapor of a higher pressure column reboils the column to provide additional vapor upflow and liquid downflow reflux for increased column drive and improved oxygen recovery.
    Type: Grant
    Filed: October 10, 1991
    Date of Patent: November 17, 1992
    Assignee: Praxair Technology, Inc.
    Inventors: John H. Ziemer, Ravindra F. Pahade
  • Feed processing for nitrogen rejection unit
    Patent number: 5051120
    Abstract: A system comprising a stripping column and a nitrogen rejection unit wherein a significant portion of the feed to the nitrogen rejection unit is provided at an increased pressure thus reducing product compression requirements.
    Type: Grant
    Filed: June 12, 1990
    Date of Patent: September 24, 1991
    Assignee: Union Carbide Industrial Gases Technology Corporation
    Inventors: Ravindra F. Pahade, James J. Maloney
  • Cryogenic distillation with unbalanced heat pump
    Patent number: 4987744
    Abstract: A cryogenic distillation system wherein a first heat exchange fluid transfers heat in part from a process stream to the bottom of a column, and in part from a process stream to a second heat exchange fluid and out of the system, thus generating net refrigeration.
    Type: Grant
    Filed: January 26, 1990
    Date of Patent: January 29, 1991
    Assignee: Union Carbide Industrial Gases Technology Corporation
    Inventors: James R. Handley, Ravindra F. Pahade
  • Air separation process with improved reboiler liquid cleaning circuit
    Patent number: 4957524
    Abstract: A cryogenic rectification method wherein liquid from a top condenser-reboiler is cleaned of higher boiling impurities by passage through an adsorbent bed and returned to the condenser-reboiler, wherein the flow back to the condenser-reboiler is driven by combination with density-reducing vapor.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: September 18, 1990
    Assignee: Union Carbide Corporation
    Inventors: Ravindra F. Pahade, John H. Ziemer, John K. Howell
  • Process to produce cold helium gas for liquefaction
    Patent number: 4701201
    Abstract: A process to produce cold helium gas suitable for use as a feed to a helium liquifier comprising employing refrigeration from a nitrogen rejection unit to reduce the temperature of the helium gas just prior to its passage to the liquifier thus enabling a reduction in the liquifier energy requirement.
    Type: Grant
    Filed: September 24, 1986
    Date of Patent: October 20, 1987
    Assignee: Union Carbide Corporation
    Inventors: Thomas C. Hanson, Theodore F. Fisher, Joseph A. Weber, Ravindra F. Pahade
  • Process to separate nitrogen and methane
    Patent number: 4664686
    Abstract: A process for more efficiently separating nitrogen and methane using a double column cryogenic rectification nitrogen rejection unit wherein feed is passed through a high pressure stripping column prior to the nitrogen rejection unit. As a result, higher pressure methane can be recovered with reduced compression requirements, and an upgraded feed to the nitrogen rejection unit enables more efficient separation.
    Type: Grant
    Filed: February 7, 1986
    Date of Patent: May 12, 1987
    Assignee: Union Carbide Corporation
    Inventors: Ravindra F. Pahade, James J. Maloney, James R. Handley
  • Process for separating methane and nitrogen
    Patent number: 4592767
    Abstract: A process for the separation of methane and nitrogen in a cryogenic distillation column driven by a closed loop recirculating fluid heat pump wherein additional column refrigeration is generated by rejecting process heat into a product stream thereby reducing the need for expansion of process streams and enabling recovery of product at relatively high pressure.
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: June 3, 1986
    Assignee: Union Carbide Corporation
    Inventors: Ravindra F. Pahade, John B. Saunders, James J. Maloney
  • Process to separate nitrogen from natural gas
    Patent number: 4501600
    Abstract: A cryogenic process to more efficiently separate nitrogen from a nitrogen-containing hydrocarbon stream wherein the separate recovery of natural gas liquids is increased and the final nitrogen removal from natural gas is accomplished at lower than conventional pressures. The nitrogen-methane separation column is driven by a closed loop heat pump circuit that utilizes a nitrogen-methane mixture.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: February 26, 1985
    Assignee: Union Carbide Corporation
    Inventor: Ravindra F. Pahade
  • Process to separate natural gas liquids from nitrogen-containing natural gas
    Patent number: 4479871
    Abstract: A process which effectively separates and recovers natural gas liquids from a natural gas stream containing nitrogen, regardless of the magnitude of the nitrogen concentration or changes in the nitrogen concentration.
    Type: Grant
    Filed: January 13, 1984
    Date of Patent: October 30, 1984
    Assignee: Union Carbide Corporation
    Inventors: Ravindra F. Pahade, John B. Saunders, James J. Maloney
  • Double column multiple condenser-reboiler high pressure nitrogen process
    Patent number: 4453957
    Abstract: A cryogenic process to efficiently produce large quantities of nitrogen gas at elevated pressure by use of a double column and multiple condenser-reboilers.
    Type: Grant
    Filed: December 2, 1982
    Date of Patent: June 12, 1984
    Assignee: Union Carbide Corporation
    Inventors: Ravindra F. Pahade, John H. Ziemer, Harry Cheung
  • Dual column high pressure nitrogen process
    Patent number: 4439220
    Abstract: A process to efficiently produce large quantities of elevated pressure nitrogen at a high recovery by the cryogenic separation of air employing two separate columns each of which is equipped with a top condenser and wherein the second column processes a feed stream obtained from the first column.
    Type: Grant
    Filed: December 2, 1982
    Date of Patent: March 27, 1984
    Assignee: Union Carbide Corporation
    Inventors: Walter J. Olszewski, Ravindra F. Pahade, John H. Ziemer
  • Split shelf vapor air separation process
    Patent number: 4416677
    Abstract: An air separation process wherein shelf vapor is employed for reversing heat exchanger cold end temperature control and is subsequently divided into two streams, one of which is expanded to provide plant refrigeration and the other is recovered as high pressure nitrogen-rich gas.
    Type: Grant
    Filed: May 25, 1982
    Date of Patent: November 22, 1983
    Assignee: Union Carbide Corporation
    Inventor: Ravindra F. Pahade
  • Air separation process with turbine exhaust desuperheat
    Patent number: 4407135
    Abstract: An improved air separation process wherein a stream which is warmed to provide temperature control for a reversing heat exchanger and is expanded to generate plant refrigeration is desuperheated before being introduced to a low pressure distillation column. The process is particularly useful when argon is a desired product of the air separation.
    Type: Grant
    Filed: December 9, 1981
    Date of Patent: October 4, 1983
    Assignee: Union Carbide Corporation
    Inventor: Ravindra F. Pahade