Patents Examined by V. Manoharan
  • Patent number: 4574036
    Abstract: Polluted industrial waste water having a high chemical demand for oxygen and fine particles in suspension is purified using the following steps: directly heating and evaporating the polluted water without subjecting it to the usual prior steps of mechanical separation such as sieving or decanting; separating sludges from the evaporated water; condensing the evaporated water; subjecting the condensed evaporated water to a physico-chemical purifying process of the coagulation-flocculation type; and filtering the purified condensed evaporated water. The purified water is pure enough to be recycled through a dyeing works. The installation includes an evaporator (10) which is preferably built in several stages with the vapor from each stage other than the first being used to evaporate the polluted water in the next stage.
    Type: Grant
    Filed: January 17, 1983
    Date of Patent: March 4, 1986
    Assignee: Ets. Ch. Scareder & Fils
    Inventor: Pierre A. Henriot
  • Patent number: 4569724
    Abstract: A sealing means for a vacuum distillation apparatus is provided having a vapor tube rotatably and sealably mounted within a vacuum tube through which vapor passes.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: February 11, 1986
    Inventor: Raymond A. Firestone
  • Patent number: 4569725
    Abstract: A C.sub.4 -hydrocarbon mixture which essentially contains n-butenes and butanes is separated by a process in whichthe mixture is reacted with a carboxylic acid in the presence of an acidic catalyst to form a butyl carboxylate,the reaction mixture obtained from the esterification zone is distilled to give, as the top product, a fraction containing the butanes, and, as the bottom product, a fraction containing the resulting butyl carboxylate,the butyl carboxylate is decomposed at elevated temperatures to give the carboxylic acid and n-butenes, andthe mixture of n-butenes and carboxylic acid is then distilled, the n-butenes being obtained as the top product, and the carboxylic acid as the bottom product.
    Type: Grant
    Filed: May 23, 1984
    Date of Patent: February 11, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: Alfred Lindner, Klaus Broellos, Gerhard Sandrock, Klaus Volkamer, Werner Hefner
  • Patent number: 4569727
    Abstract: An apparatus and method for vaporizing and recovering, by condensation, a composite liquid solution of at least two components having substantially different vaporizing temperatures. The apparatus includes at least one liquid condensate vaporizing chamber wherein the vapor of the lower vapor point component will be condensed from a vapor zone above the vapor zone of the vapor of the higher vapor point component. The apparatus further includes at least two weir or other means to define the vapor levels of each vaporized component and the condensing means for each component are disposed on the opposite side of the weir from the vapor zone.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: February 11, 1986
    Inventor: James W. McCord
  • Patent number: 4568428
    Abstract: A vapor distillation system sprays a mixture of liquids to be distilled into an evacuated vaporizer chamber. The low boiling point components of the mixture will be vaporized while the remainder of the mixture will collect at the bottom of the vaporizer chamber. The collected liquid is recirculated and heated. The recirculating liquid is discharged, and fresh mixture is introduced, as a function of the sensed temperature of the recirculating liquid. The vapor is transferred to a condenser chamber having a water spray head so that the chilled spray condenses the vapor. Both the condenser chamber and the vaporizer chamber have fluid level control systems.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: February 4, 1986
    Assignee: General Signal Corporation
    Inventors: Timothy J. Rigg, Frank Anderson, Richard Curtin
  • Patent number: 4568427
    Abstract: A process for the continuous isolation of phthalic anhydride and maleic anhydride from the reaction gases obtained by catalytic oxidation of o-xylene or naphthalene with air, wherein the reaction gases are treated with a hydrocarbon of boiling range from to C. as the solvent in a column, and are then treated with an organic solvent of boiling range from to C. in a second column, the phthalic anhydride and maleic anhydride being isolated from the liquid bottom product of the first column.
    Type: Grant
    Filed: February 11, 1983
    Date of Patent: February 4, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: Eckehard Danz, Gerd Dumbgen, Ernest Miesen, Johannes E. Schmidt, Friedrich Wirth
  • Patent number: 4568429
    Abstract: 2,4-Dihydroxybenzophenone is prepared substantially quantitatively and in a highly purified form by reacting resorcinol with a benzotrihalide in the presence of an aqueous solution of N-methylpyrrolidone and subsequently subjecting the crude reaction product mixture to vacuum distillation.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: February 4, 1986
    Assignee: GAF Corporation
    Inventor: Kou-Chang Liu
  • Patent number: 4561940
    Abstract: The overcharge prevention device is installed in a solvent processing plant in a vacuum evaporator of a heat exchanger. It assures that the level of the cleaning solution in the vacuum evaporator cannot randomly rise when a feed valve malfunctions. A float body of an overcharge valve extending into the vacuum evaporator exerts a pressure through a double-arm lever and a valve plunger upon a ball valve and a valve seat in normal operation and holds the overcharge valve in a closed position. As the level of the cleaning solution undesirably rises, the buoyant action of the cleaning solution acts on the float body, causing the pressure on the valve seat to diminish, and the overcharge valve opens. This permits air to enter into the vacuum evaporator through the overcharge valve. The generated vacuum collapses and the suction force employed to ingest the cleaning solution disappears.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: December 31, 1985
    Assignee: Mentec Ag
    Inventor: Rene Meier
  • Patent number: 4560442
    Abstract: A desired separation between sidedraw product streams withdrawn from a fractional distillation column is maintained by controlling the flow rate of the external reflux associated with a particular sidedraw product stream in response to the output signal from a temperature controller which is reset by an internal reflux controller. Such cascade control improves the stability of a fractionation process and provides for good control of the separation between sidedraw product streams.
    Type: Grant
    Filed: March 15, 1984
    Date of Patent: December 24, 1985
    Assignee: Phillips Petroleum Company
    Inventor: Gyan P. Jain
  • Patent number: 4559110
    Abstract: Distillation of the heavy waste stream from the manufacture of phenol via the cumene process provides an overhead stream containing phenol, acetophenone and 2-phenyl propionaldehyde. Extraction of the overhead stream with aqueous caustic removes the phenol and subsequent distillation of the remaining two components in the presence of a catalytic amount of caustic provides a substantially pure acetophenone distillate.
    Type: Grant
    Filed: July 11, 1983
    Date of Patent: December 17, 1985
    Assignee: The Dow Chemical Company
    Inventors: Loren L. Swearingen, Alfred W. Heinsohn, Craig W. Snook, Wallace E. Embrey, Garnet E. McConchie
  • Patent number: 4514261
    Abstract: Isopropenylstyrene, present in t-butylstyrene in small quantities as an impurity, is removed by extractive distillation using sulfolane as solvent.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: April 30, 1985
    Assignee: El Paso Products Company
    Inventor: Glen F. Crum
  • Patent number: 4512851
    Abstract: This process separates less volatile contaminates from thermal power recovery systems utilizing a volatile working fluid in a cyclic closed system; such a system may comprise a reservoir, a pump, a heater, a separator, a throttle device, a turbine and a condenser. The purification can be accomplished during start-up, shut-down or periods of low power generation. The contaminant is separated from the working fluid in the separator in which the temperature and pressure correspond to a dew-point substantially above that of a sample of uncontaminated working fluid. To achieve this condition, the normal flow of liquid from the reservoir to the heater is reduced and the heater and throttle device are correspondingly adjusted. The condensed contaminant is removed from the separator while substantially all of the working fluid which has been vaporized is passed on through the throttle device to the turbine.
    Type: Grant
    Filed: February 15, 1983
    Date of Patent: April 23, 1985
    Inventor: Judson S. Swearingen
  • Patent number: 4492613
    Abstract: Methanol and cyclohexane are recovered from a condensed methanol-cyclohexane azeotrope by allowing the condensed azeotrope to separate in a vessel into an upper phase rich in cyclohexane and a lower phase rich in methanol, fractionating the upper phase in a first column whereby the methanol-cyclohexane azeotrope is taken off the top and returned to the vessel while cyclohexane is removed from the lower portion of the first column, and fractionating the lower phase in a second column whereby the methanol-cyclohexane azeotrope is taken off the top and returned to the vessel while methanol is removed from the lower portion of the second column.
    Type: Grant
    Filed: August 2, 1982
    Date of Patent: January 8, 1985
    Assignee: The B. F. Goodrich Company
    Inventor: Gerald V. Wootton
  • Patent number: 4482431
    Abstract: A distillation apparatus is provided having a first chamber for receiving water to be distilled and which surrounds one end of a second chamber and also contains the condensing tube; liquid from the first chamber passes to a tube located in a second chamber which traverses a path sufficient to heat the water in the tube to a predetermined temperature before exiting through a valve to a liquid/gas separating device; a third chamber receives the liquid from the separation device and is provided with a heater to heat the liquid until it vaporizes whereupon it rises through the second chamber to enter the condenser tube located in the first chamber; the steam entering the condensing tube is cooled by the incoming water and is discharged from the apparatus.
    Type: Grant
    Filed: February 18, 1983
    Date of Patent: November 13, 1984
    Inventor: John L. Voorhees
  • Patent number: 4470879
    Abstract: Normal butane withdrawn from the main fractionator in an acid alkylation process is recycled to the main fractionator as required to insure that the actual alkylate to normal butane ratio in the alkylate product withdrawn from the main fractionator does not go below a desired ratio. Maintenance of the actual ratio at or above the desired ratio substantially minimizes the concentration of isobutane in the alkylate product stream.
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: September 11, 1984
    Assignee: Phillips Petroleum Company
    Inventor: Thomas Hutson, Jr.
  • Patent number: 4464227
    Abstract: A charge of distilland (33) is metered into a heated inclined trough (18) within a chamber (10). Vapors of distilland rise to a level (41) which is below the upper level (26) of the trough. The vapors spill over the sides (31 and 32) of the trough and fall to the lower section of the chamber where cooling coils (42) condense the vapors and the resultant distillate flows out an exit conduit (122). Residue materials are moved by a pusher (47) over the end (26) of the trough into a drain chute (51). During the return of the pusher, an air cylinder (103) is operated to lift the pusher from the bottom of the trough.
    Type: Grant
    Filed: September 16, 1982
    Date of Patent: August 7, 1984
    Assignee: AT&T Technologies, Inc.
    Inventor: Darrel R. Colwell