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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7437891 | Recovery and purification of ethylene A process for the recovery and purification of ethylene and optionally propylene from a stream containing lighter and heavier components that employs an ethylene distributor column and a partially thermally coupled distributed distillation system. ... | 10/21/2008 |
| 7320745 | Energy efficient method for exothermic reactions An energy efficient process scheme for a highly exothermic reaction-distillation system in which the reactor is external to the distillation column and the feed to the reactor is a mixture of at least one liquid product stream from the distillation column with or wi... | 01/22/2008 |
| 6755965 | Ethane extraction process for a hydrocarbon gas stream A process for ethane extraction from a gas stream based on turboexpansion and fractionation with no mechanical refrigeration is provided. The feed gas is sweetened and dehydrated by a conventional amine process and by a molecular sieve unit, to remove carbon dioxide... | 06/29/2004 |
| 5877380 | Quench oil viscosity control in pyrolysis fractionator The viscosity of quench oil circulated in a pyrolysis fractionation unit is controlled by contacting pyrolysis furnace effluent with a slip stream of 0.1-0.5 kg/kg of the quench oil, separating the resulting vapor-liquid mixture to remove tarry liquid, an... | 03/02/1999 |
| 5602293 | Process for separating a feedstock stream essentially consisting of hydrogen, methane and C3 /C4 -hydrocarbons Process for separating a feedstock stream essentially consisting of hydrogen, methane and C3 /C4 -hydrocarbons, which first passes through a pretreatment, such as, e.g., dehydrogenation, after which the feedstock stream undergoes an ... | 02/11/1997 |
| 5456823 | Process for dehydration and/or desalination and for simultaneous fractionation of a petroleum deposit effluent A process for the dehydration and/or desalination and simultaneous fractionation of a petroleum deposit effluent containing oil, associated gas and water which can be saline, which process comprises: (a) at least one step for separating the liquid and gaseous ... | 10/10/1995 |
| 5389242 | Process for the fractionation of oil and gas on a petroleum deposit effluent A description is given of a process for the fractionation of oil and gas on a petroleum deposit effluent, including: (a) a stage wherein the liquid and gaseous phases are separated at the gas evacuation pressure P1, producing a gaseous fraction G1, on the one ... | 02/14/1995 |
| 5139651 | Aromatic extraction process using mixed polyalkylene glycol/glycol ether solvents Processes are provided for the recovery of aromatic hydrocarbons from feeds comprising mixtures of aromatic and non-aromatic hydrocarbons using a mixed aromatic extraction solvent at extraction temperature of less than 250° F. The mixed extraction solven... | 08/18/1992 |
| 5116485 | Apparatus and method for recovering diesel-quality fuel from produced crude oil An apparatus and process for recovering a diesel-quality fuel from produced crude oil is described. The diesel-quality fuel is produced by flashing the crude feedstock at high temperatures and recovering the diesel quality fuel as a liquid from a refluxin... | 05/26/1992 |
| 5110447 | Process and apparatus for partial upgrading of a heavy oil feedstock The invention involves visbreaking heavy oil under mild conditions in a vertical vessel containing a vertical elongate ring spaced inwardly from the vessel wall to form an outer open-ended annular chamber and an inner open-ended soak chamber. Heavy oil at... | 05/05/1992 |
| 5039396 | Hydrotreater feed/effluent heat exchange A heat integrated hydrotreating process has been invented. The feedstock is a cracked hydrocarbon stock which is mixed with hydrogen to suppress coking before heating in a multiple tube furnace to reactor inlet temperature. A minor portion of the feedstoc... | 08/13/1991 |
| 5030339 | Separation of gas and oil mixtures In the separation of a compressed multi-component hydrocarbon stream containing liquid and gas phases to produce a liquid product stream having a specified maximum vapor pressure and a gas product stream having a specified maximum cricondenbar, gas flarin... | 07/09/1991 |
| 5026952 | Process for separating C2 + or C3 + or C4 hydrocarbons from a gaseous mixture The aim is to separate, by cooling and partial condensation of C2+, C3+ or C4 hydrocarbons contained in a gas mixture comprising, in addition to these components, even lighter constituents. For this purpose, the gas mixtur... | 06/25/1991 |
| 5022981 | Aromatic extraction process using mixed polyalkylene glycol/glycol ether solvents Processes are provided for the recovery of aromatic hydrocarbons from feeds comprising mixtures of aromatic and non-aromatic hydrocarbons using a mixed aromatic extraction solvent at extraction temperature of less than 250° F. The mixed extraction solven... | 06/11/1991 |
| 4784753 | Deasphalting process comprising power recovery from the stage of separating deasphalted oil from the deasphalting solvent In a deasphalting process wherein the deasphalted oil is separated from the deasphalting solvent, the invention consists of performing said separation in at least two separate steps, differing by their temperatures, and of recovering heat from the deaspha... | 11/15/1988 |
| 4690733 | Process for the separation of hydrocarbons from a mixed feedstock In a combination solvent extraction-steam distillation process for the recovery of aromatic hydrocarbons, the improvement comprising (a) introducing high pressure steam into a steam ejector; (b) passing the steam from step (a) to a first heat exchanger where it ... | 09/01/1987 |
| 4664785 | Process for distillation of petroleum by progressive separations The process consists in successively separating increasingly heavy petroleum cuts at the head of a plurality of columns CO1, CO2, CO3 and Cl0 of a first series of columns which feed individually each column of the second series. The column CO7 is a gasoli... | 05/12/1987 |
| 4664786 | Process for the separation of hydrocarbons from a mixed feedstock In a steam distillation process for the recovery of aromatic hydrocarbons wherein there is (i) a primary flash zone at the top of the distillation zone in which rich solvent is flashed and/or (ii) provision for the removal of side cut distillate vapors fr... | 05/12/1987 |
| 4661242 | Diluent distillation process and apparatus An improvement in a process for the treatment of heavy oil in which a hydrocarbon diluent is subjected to distillation prior to its addition to a heavy oil production stream, to remove at least some of the light components in the diluent that would otherw... | 04/28/1987 |
| 4495035 | Fluid handling method with improved purification The invention pertains to improvements in a fluid handling system in which a working fluid passes through a rotor while undergoing a pressure change. A shaft extends longitudinally from and rotates with the rotor. A first seal surrounds the shaft in axial... | 01/22/1985 |
| 4447318 | Extractive distillation method In a method for separating a hydrocarbon mixture into relatively difficultly soluble hydrocarbons and relatively easily soluble hydrocarbons by extractive distillation using a polar solvent comprising feeding the starting hydrocarbon mixture to at least t... | 05/08/1984 |
| 4428202 | Electrical power generation by fractionation column reboiler A process is disclosed for driving a turbine, which preferably is connected to an electrical generator, using energy supplied by the reboiler system of a fractionation column. The portion of the bottoms liquid of the column which is to be recycled through... | 01/31/1984 |
| 4375387 | Apparatus for separating organic liquid solutes from their solvent mixtures Process and apparatus for extracting an organic liquid from an organic liquid solute/solvent mixture. The mixture is contacted with a fluid extractant which is at a temperature and pressure to render the extractant a solvent for the solute but not for the... | 03/01/1983 |
| 4349415 | Process for separating organic liquid solutes from their solvent mixtures Process and apparatus for extracting an organic liquid from an organic liquid solute/solvent mixture. The mixture is contacted with a fluid extractant which is at a temperature and pressure to render the extractant a solvent for the solute but not for the... | 09/14/1982 |
| 4342639 | Process to separate bituminous material from sand (Tar Sands) Bituminous sand such as oil sand or tar sand is mixed with a halogenated organic solvent which has a density greater than that of water at the same temperature. The slurry is continuously transferred to a conveyor system which is at least partially submer... | 08/03/1982 |
| 4321132 | Distillation of crude oil An entire crude oil stream is preheated by various sources of heat and brought to final temperature by a furnace. At this highest temperature, the stream is flashed into two portions, the heavier portion used only as a source of sensible heat for conserva... | 03/23/1982 |
| 4308131 | Method of improving thermal efficiency of sidedraw fractionating columns An improved process for the fractional distillation of a multi-component liquid in a multiple tray fractional distillation column having at least one sidedraw tray is disclosed, the process being characterized by elimination of draw tray overflow from at ... | 12/29/1981 |
| 4292140 | Process for recovering heat in distillation process In a distillation process, the heats of distillates and bottom product are recovered to preheat the feed and to generate the steam of higher than 5 kg/cm2 G which in turn may be utilized to improve the distillation efficiency.... | 09/29/1981 |
| 4265736 | Process and apparatus for reducing the energy required to separate liquids by distillation A method and apparatus are disclosed relating to the recovery and reuse of heat during fractionation of liquids in a tray-type fractionating tower. According to this method, a portion of the feed to the tower is directed through heat exchange tubing posit... | 05/05/1981 |
| 4246073 | Process of distillation of a multicomponent hydrocarbon mixture A process for distilling multicomponent hydrocarbon mixtures in which the relative volatility between the dominant component in the lightest product and the dominant component in the heaviest component is between 1.10 and 7. The hydrocarbon mixture is fed... | 01/20/1981 |
| 4131538 | Method of separating a predetermined fraction from petroleum oil using multistage evaporators A method and apparatus for separating a predetermined fraction from a crude oil includes preheating the crude oil to vaporize a portion, and feeding the two-phase crude to a first stage flash evaporator. In the first stage evaporator, a vapor portion is s... | 12/26/1978 |
| 4087354 | Integrated heat exchange on crude oil and vacuum columns The amount of heat input required for the sequential fractionation of a crude oil in a crude column and a vacuum column is reduced by an improved heat exchange method wherein the desalted crude oil is flashed and the flash zone liquid is split into two st... | 05/02/1978 |
| 4019979 | Fractionation of hydrocarbons A process for the fractionation of hydrocarbons which includes the steps of extracting heat from a liquid sidecut stream, splitting the sidecut stream into two portions, splitting the liquid stream formed by condensing the overhead vapor stream into two p... | 04/26/1977 |
| 3968030 | Method and an installation for improving the energy balance of installations for processing chemical process streams and especially petroleum refineries In a chemical processing plant such as a petroleum refinery, provision is made for steam boilers and heating furnaces in which the energy consumed by the boilers for generating steam exceeds the energy consumed by the heating furnaces. The steam is produc... | 07/06/1976 |
