Patents Assigned to Union Carbide Corporation
  • Prevention of membrane degradation
    Patent number: 4881953
    Abstract: In the separation of gases in a membrane system, degradation of membrane permeability is prevented by passing the feed gas mixture through a bed of adsorbent material, preferably activated carbon, to adsorb the heavier hydrocarbon contaminants responsible for degradation without removal of lighter hydrocarbons.
    Type: Grant
    Filed: September 15, 1988
    Date of Patent: November 21, 1989
    Assignee: Union Carbide Corporation
    Inventors: Ravi Prasad, Oscar W. Haas
  • Method for gas separation using helically wound hollow fibers permeable membrane cartridge
    Patent number: 4881955
    Abstract: Feed gas is introduced into the bores of a helically wound hollow fiber membrane cartridge containing hollow fibers of essentially uniform active lengths. Permeate gas flow is maintained countercurrent to the feed and raffinate gas entrance and exit axis, respectively, while the directional flow axis of permeate withdrawal can be at a substantial angle to the helically wound hollow fiber membrane surface. Complete radial mixing of the permeate stream on the outer, permeate side and essentially no axial mixing on either the permeate or the raffinate side of the hollow fiber membrane cartridge are maintained.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: November 21, 1989
    Assignee: Union Carbide Corporation
    Inventors: Benjamin Bikson, Slavatore Giglia
  • Permeable membranes for enhanced gas separation
    Patent number: 4881954
    Abstract: Composite membranes are prepared by depositing a separation layer on an asymmetric support layer. The separation layer has a selectivity equal to or greater than that of the material of the asymmetric support layer for a desired gas separation. The support layer is desirably produced in non-asymmetric form, and exposed to an elevated temperature approaching the glass transition temperature of the support layer material under non-swelling conditions to modify the structure thereof to create asymmetry therein, before or after the deposition of the separation layer, and to increase its compaction resistance and collapse pressure. Such desirable properties are conveniently achieved on a repeatable basis, enhancing the uniformity and reliability of the treated support layer and of composite membranes produced therefrom, for use in gas separation operations.
    Type: Grant
    Filed: July 31, 1987
    Date of Patent: November 21, 1989
    Assignee: Union Carbide Corporation
    Inventors: Benjamin Bikson, James E. Miller, Joyce K. Nelson
  • Hollow fiber multimembrane cells and permeators
    Patent number: 4880440
    Abstract: Two or more different permeable membranes capable of separating different components of a fluid mixture are used to farbicate hollow fiber multicomponent cells and permeator modules.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: November 14, 1989
    Assignee: Union Carbide Corporation
    Inventor: Jerry Perrin
  • Cryogenic rectification process for separating nitrogen and methane
    Patent number: 4878932
    Abstract: A cryogenic rectification process for the separation of nitrogen and methane wherein feed is preseparated in a high pressure column or phase separator into vapor and liquid portions, the vapor is condensed and at least partly employed as reflux for a main column, the liquid is passed into the main column at an intermediate point, and a portion of the liquid is vaporized against itself to provide additional column vapor upflow.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: November 7, 1989
    Assignee: Union Carbide Corporation
    Inventors: Ravindra F. Phade, James R. Handley
  • Fuel jet burner and combustion method
    Patent number: 4878829
    Abstract: A burner and combustion method employing oxygen or oxygen-enriched air as the oxidant comprising a low velocity fuel stream in proximity to high velocity main fuel within a combustion zone enabling efficient combustion with a stable flame at very high fuel velocities.
    Type: Grant
    Filed: May 5, 1988
    Date of Patent: November 7, 1989
    Assignee: Union Carbide Corporation
    Inventor: John E. Anderson
  • Treatment of permeable membranes
    Patent number: 4877421
    Abstract: A method for enhancing the long term performance of gas separation membranes. The permeable membranes are heated at a moderate temperature of from about 50.degree. C. to 140.degree. C. Use of this method enables restoration and reclamation of permeable membranes that have suffered degradation in performance in gas separation processes.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: October 31, 1989
    Assignee: Union Carbide Corporation
    Inventors: Benjamin Bikson, Salvatore Giglia
  • Treatment of petroleum cokes to inhibit coke puffing
    Patent number: 4875979
    Abstract: A process for treating high sulfur petroleum coke to inhibit puffing is disclosed wherein particles of the petroleum coke are contacted, in the absence of a binder, with a compound containing an alkali or alkaline earth metal selected from the group consisting of sodium, potassium, calcium and magnesium, at an elevated temperature above that at which the alkali or alkaline earth metal compound begins to react with carbon, but below the temperature at which the coke particles would begin to puff in the absence of the compound. The coke particles are maintained at the elevated temperature for a sufficient period of time to permit the reaction to proceed and allow products of reaction to penetrate into the particles and form an alkali-or alkaline-earth-metal-containing deposit throughout the mass of the particles; and then cooling the so-treated coke particles.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: October 24, 1989
    Assignee: Union Carbide Corporation
    Inventors: Thomas H. Orac, Herbert C. Quandt, David R. Ball
  • Photocopolymerizable compositions based on epoxy and hydroxyl-containing organic materials and substituted cycloaliphatic monoepoxide reactive diluents
    Patent number: 4874798
    Abstract: This invention is directed to photocopolymerizable compositions comprising an epoxide containing two or more epoxy groups, a poly (active hydrogen) organic compound, a photoinitiator and, as a reactive diluent, a substituted cycloaliphatic monoepoxide. The photocopolymerizable compositions have low viscosity and can be applied to suitable substrates by conventional methods and, after being cured to dry coating films, can have utility as automotive finishes, can finishes, appliance finishes, general metal finishes, adhesives, printing inks and the like.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: October 17, 1989
    Assignee: Union Carbide Corporation
    Inventors: Joseph V. Koleske, George T. Kwiatkowski
  • Heterogeneous alkoxylation using anion-bound metal oxides
    Patent number: 4873017
    Abstract: Active-hydrogen compounds, for example, primary and secondary alcohols or diols, are alkoxylated, for example, ethoxylated, using solid anion-bound metal oxide catalysts, such as, zirconium oxysulfate catalyst. Hydrous zirconium oxide is treated with solutions of sulfate phosphate, nitrate or tetrafluoroborate and calcined in air at 300.degree. to 950.degree. C. to produce highly active heterogeneous alkoxylation catalysts. The amorphous catalysts afford narrow molecular weight products. The catalyst can be removed from the product by filtration and reused with no significant loss in activity. Reaction temperatures of 50.degree. to 140.degree. C. are employed for alkoxylation.
    Type: Grant
    Filed: November 12, 1987
    Date of Patent: October 10, 1989
    Assignee: Union Carbide Corporation
    Inventor: Stephen W. King
  • High purity, high temperature pipe thread sealant paste
    Patent number: 4872914
    Abstract: A pipe thread sealant paste composition comprising from about 30 to about 80 percent by weight of natural flake graphite particles of a size sufficient to pass through a 100 Tyler mesh sieve and a liquid carrier comprising a mixture of mineral oil and petrolatum, the paste composition preferably having a total ash content of no greater than about 1 percent by weight and containing leachable chlorides in amounts equal to or less than about 50 parts per million. The invention also relates to a method for preparing and applying the pipe thread sealant paste to pipe joints.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: October 10, 1989
    Assignee: Union Carbide Corporation
    Inventor: Ronald A. Howard
  • Constant arc voltage gas metal arc welding process
    Patent number: 4871898
    Abstract: A gas metal arc welding process employing a shielding gas mixture consisting essentially of (A) 2 to 12 volume percent carbon dioxide, (B) 20 to 45 volume percent helium and (C) the balance argon.
    Type: Grant
    Filed: August 17, 1988
    Date of Patent: October 3, 1989
    Assignee: Union Carbide Corporation
    Inventors: Lawrence Cherne, Kevin A. Lyttle
  • Process for fluidizing
    Patent number: 4866858
    Abstract: In a process for fluidizing a bed of particles by passing a gas continuously through the bed, the improvement comprising dividing the bed into at least two sections, and introducing the gas sequentially into each section, one section at a time, the flow of gas and the sequence being at a rate sufficient to maintain the entire bed of particles in a fluidized state.
    Type: Grant
    Filed: September 17, 1987
    Date of Patent: September 19, 1989
    Assignee: Union Carbide Corporation
    Inventor: Mark A. Delano
  • Oxygen enriched air system
    Patent number: 4867766
    Abstract: Enriched oxygen from a pressure swing adsorption system and air are blended to provide oxygen enriched air of desired purity, particularly for use at flow rates between those for which liquid oxygen and on-site cryogenic air separation plants are desirable.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: September 19, 1989
    Assignee: Union Carbide Corporation
    Inventors: Michael J. Campbell, James Smolarek, John J. Pietruszewski
  • Process of producing foamed products
    Patent number: 4867923
    Abstract: Process of producing a foamed product by forming a shaped article from a composition comprising a thermoplastic olefin polymer, a hydrolyzable, unsaturated silane, a gas generating compound and an organic peroxide in an amount of about 0.5 to about 2 percent by weight, and thereafter subjecting the shaped article to elevated temperatures to activate the gas generating compound and organic peroxide.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: September 19, 1989
    Assignee: Union Carbide Corporation
    Inventors: Barry Topcik, Austin E. Barnabeo
  • Gas dispersion process and system
    Patent number: 4867918
    Abstract: Gas dispersion in a liquid is enhanced by combining the gas and liquid in close proximity to a venturi or other flow constriction means used to create supersonic flow velocities and subsequent deacceleration to sub-sonic velocity. When a venturi is employed, the gas-liquid mixing occurs in the converging portion of the venturi or upstream but in close proximity to said venturi. Turbulent flow conditions upstream of the venturi or other flow constriction means adequate to disperse the gas uniformly in the liquid are not required and, surprisingly, the gas and liquid need not be uniformly dispersed prior to acceleration to supersonic velocity.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: September 19, 1989
    Assignee: Union Carbide Corporation
    Inventors: Kazuo Kiyonaga, Lawrence M. Litz, Thomas J. Bergman
  • Paint removing composition containing lower alkyl-substituted 2-oxazolidinones
    Patent number: 4865758
    Abstract: A paint removing composition comprising lower alkyl-substituted 2-oxazolidinones is disclosed. Also disclosed are methods for softening and removing paint which has been applied to a substrate comprising contacting a painted substrate with the above-described paint remover composition.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: September 12, 1989
    Assignee: Union Carbide Corporation
    Inventors: Kenneth C. Caster, Ronald L. Readshaw
  • Plasma spray apparatus for coating irregular internal surfaces
    Patent number: 4866241
    Abstract: An apparatus for coating the internal surface of a tubular object having an irregular internal surface which comprises a combination of arms which enable the torch to be in the optimal coating position as it moves over and coats the internal surface.
    Type: Grant
    Filed: March 30, 1988
    Date of Patent: September 12, 1989
    Assignee: Union Carbide Corporation
    Inventors: William G. Doherty, Mark McCoy, David J. Sharp
  • Low NO.sub.x high efficiency combustion process
    Patent number: 4863371
    Abstract: A process to combust fuel and oxidant at high efficiency and with low NO.sub.x generation even when the fuel has non-uniform characteristics and the oxidant is pure oxygen, wherein fuel and oxidant are first combusted within a high velocity oxidant-rich jet, fuel is mixed with combustion products in a recirculation zone and the mixture is aspirated into the oxidant-rich jet and combusted in a diffuse secondary flame at the periphery of the oxidant-rich jet.
    Type: Grant
    Filed: August 3, 1988
    Date of Patent: September 5, 1989
    Assignee: Union Carbide Corporation
    Inventor: Min-Da Ho
  • Tin containing activated silicon for the direct reaction
    Patent number: 4864044
    Abstract: An improved Direct Reaction process which comprises reacting an organohalide with an activated silicon composition, the improvement comprising maintaining the composition of the activated silicon so that it comprises, based on the amount of silicon, 0.05-10 wt. % catalyst; an effective amount of promoter, and 0.001-0.1 wt. % tin, wherein the promoter to tin ratio is 10-250. Activated silicon compositions and methods for selecting a catalyst composition also are provided.
    Type: Grant
    Filed: February 15, 1985
    Date of Patent: September 5, 1989
    Assignee: Union Carbide Corporation
    Inventors: Kenrick M. Lewis, Thomas E. Childress