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| Number | Title | Issue Date |
| 7338563 | Process for cleaning hydrocarbons from soils A combination of parallel processes is disclosed to provide optimal re-mediation operations for contaminated soil. Soils with high levels of heavy petroleum hydrocarbons are directed to a thermal process for destruction in a combustion process. Carbon dioxide genera... | 03/04/2008 |
| 7288184 | Process for mitigating acids in a system for separating aromatic hydrocarbons from a hydrocarbon feedstream Disclosed is a process for removing acids in a system in which aromatic hydrocarbons are separated from a mixture with aliphatic hydrocarbons. The aromatic hydrocarbons are extracted from the mixture using an extracting solvent. The aromatic hydrocarbons are strippe... | 10/30/2007 |
| 7208057 | Method for avoiding air pockets in a joint between two structural components When two structural components are to be joined, for example, when an aircraft skin section is to be secured to a stringer by an adhesive bonding, it is important that the joining surface areas are plane to avoid the formation of air inclusions in the joint because ... | 04/24/2007 |
| 7153394 | System to isolate dianhydrides A process to isolate dianhydride from an exchange reaction comprises extracting a bisimide/anhydride exchange reaction aqueous phase with an organic solution comprising an exchange catalyst at a first temperature and pressure to form an extracted aqueous phase compr... | 12/26/2006 |
| 7078580 | Process for separating aromatics by extractive distillation and a composite solvent used therein This application relates to a composite solvent for separating aromatics by extractive distillation, comprising a main solvent, a solutizer and a modifier. Said solutizer is selected from any one or mixtures of any two of C8–C11 aromatics hav... | 07/18/2006 |
| 7052597 | Tuning fuel composition for driving cycle conditions in spark ignition engines Tuning fuel composition delivered to a spark ignition, internal combustion engine as a function of driving cycle conditions results in improvements in one or more of fuel efficiency and combustion emissions. ... | 05/30/2006 |
| 7005058 | Process and apparatus for removing sulfur from hydrocarbons Disclosed is an apparatus and process for controlling the sulfur content of effluent from a hydrocarbon fractionation column. The effluent includes a low boiling stream, a middle boiling stream and a high boiling stream. Either of the feed or the low boiling stream ... | 02/28/2006 |
| 6875341 | Process for enhancing the value of hydrocabonaceous natural recources A process for upgrading hydrocarbonaceous oil containing heteroatom-containing compounds where the hydrocarbonaceous oil is contacted with a solvent system that is a mixture of a major portion of a polar solvent having a dipole moment greater than about 1 debye and ... | 04/05/2005 |
| 6844480 | Method of separating dimethyl ether from an olefin stream This invention is directed to a method of removing dimethyl ether from an olefin stream. Dimethyl ether is removed from the olefin stream by first separating the olefin stream into a first stream comprising dimethyl ether and lighter boiling point compounds, and a s... | 01/18/2005 |
| 6821413 | Method and apparatus for continuous separation and reaction using supercritical fluid A method for the continuous process of fluids is based on mixing the fluid with a supercritical fluid. The mixing of the two fluids may be accomplished using either a co-flow or counter-flow process. The process focuses on the difference in the solubilities of the d... | 11/23/2004 |
| 6800253 | Apparatus and process for improved aromatic extraction from gasoline The improved process and apparatus of the present invention for extracting high purity aromatics from gasoline using a glycol solvent based extraction process decrease liquid-vapor flashing, reduce reflux flow rate, and use heat of enthalpy produces at one point as ... | 10/05/2004 |
| 6616831 | Aromatics separation process and method of retrofitting existing equipment for same An improved process for the recovery of aromatic compounds from a mixture containing aromatic and non-aromatic compounds and method for retrofitting existing equipment for the same is provided. The improved process comprises the steps of recovering aromat... | 09/09/2003 |
| 6554995 | Method of separating petroleum-containing material into fractions, extraction system, and extraction fluid therefor A method of separating a petroleum-containing material into at least two fractions, an extraction system, and an extraction fluid therefor are provided. Petroleum-containing material as well as a solvent mixture comprising 50%-99% by volume sub-critical c... | 04/29/2003 |
| 6303021 | Apparatus and process for improved aromatic extraction from gasoline The improved process and apparatus of the present invention for extracting high purity aromatics from gasoline using a glycol solvent based extraction process decrease liquid-vapor flashing, reduce reflux flow rate, and use heat of enthalpy produces at on... | 10/16/2001 |
| 6210583 | Spent caustic pretreatment and enhanced oxidation process A process for pre-treating a spent caustic stream prior to oxidation which includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate ... | 04/03/2001 |
| 5911875 | Method and system for generating power from residual fuel oil A method of generating power from residual fuel oil that is deasphalted with a flow of process steam to produce a deasphalted oil stream, a pitch stream, and a deasphalting condensate stream. The deasphalted oil stream is burned in a pressurized oxygen-be... | 06/15/1999 |
| 5885422 | Spent caustic (pre)treatment process A process for pretreating a spent caustic stream prior to oxidation includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate contain... | 03/23/1999 |
| 5879540 | Process for reducing corrosion in a system for separating aromatic hydrocarbons from a mixture with aliphatic hydrocarbons Disclosed is a process for reducing corrosion in a system in which aromatic hydrocarbons are separated from a mixture with aliphatic hydrocarbons. The aromatic hydrocarbons are extracted from the mixture using an extracting solvent. The aromatic hydrocarb... | 03/09/1999 |
| 5843302 | Solvent deasphalting unit capable of generating power Solvent deasphalting apparatus includes a separator that receives two inputs, a heavy hydrocarbon feed and a solvent feed; and the apparatus produces two outputs, an asphaltene/solvent stream and a deasphalted oil/solvent stream. A solvent recovery unit o... | 12/01/1998 |
| 5804060 | Method of and apparatus for producing power in solvent deasphalting units Power is generated in an organic Rankine cycle turbine by expanding a stream of solvent vapor produced by a flash drum in a deasphalting unit to produce a stream of expanded solvent vapor that is combined with a stream of solvent vapor and steam from a st... | 09/08/1998 |
| 5647971 | Method and apparatus for changing solvent composition in a solvent recovery system of a dewaxing apparatus A method and apparatus for changing the solvent composition in a solvent recovery system of a dewaxing apparatus, depending on the type of stock oil, by introducing a part of dry solvent into a wet solvent tank to thereby increase or decrease a concentrat... | 07/15/1997 |
| 5527448 | Process for obtaining a fuel through extraction and hydrotreatment of a hydrocarbon charge, and the gas oil obtained A process for obtaining a fuel for internal combustion engines from a hydrocarbon charge, comprising a step (a) for distillation (D1) in which a bottom product (Q1) is obtained via a line 3 and in which a top product (T1) is obtained via a line 2, a step ... | 06/18/1996 |
| 5447620 | Method of dehydrating the solvent resulting from a process step of dewaxing hydrocarbons A method of dehydrating a solvent originating from a hydrocarbon dewaxing operation, wherein a moist composite organic solvent, for example a moist MEK/toluene mixture is dehydrated in a first distillation zone, the resulting first distillate is contacted... | 09/05/1995 |
| 5328596 | Lubricating oil refining process Thermal degradation of furfural in solvent refining of lubricating oil stocks is reduced by use of a thin-film evaporator for the final stages of furfural recovery, permitting increased pressure to be used in each stage of furfural recovery.... | 07/12/1994 |
| 5225072 | Processes for the separation of aromatic hydrocarbons from a hydrocarbon mixture Processes are disclosed for the separation of aromatic hydrocarbons from feedstreams containing mixtures of aromatic and non-aromatic hydrocarbons using extractive distillation with an aromatic selective solvent in order to separate the aromatic hydrocarb... | 07/06/1993 |
| 5202520 | Method for aromatic hydrocarbon recovery A method is provided for the recovery of aromatic hydrocarbons from the extract phase of aromatic-selective solvent extraction process which involves withdrawing a vapor side-cut fraction containing aromatic hydrocarbons and solvent from a stripping zone ... | 04/13/1993 |
| 5188709 | Crude oil processing apparatus for heavy oil extraction The present invention provides an apparatus for preparing and treating a heavy oil extraction solvent. A solvent fraction is separated from a crude oil and combined with a slip stream of rerun solvent taken from an extraction process solvent recycle syste... | 02/23/1993 |
| 5176821 | Process for the separation of aromatic hydrocarbons with energy redistribution In a combined solvent extraction/steam distillation process for the separation of aromatic hydrocarbons from a mixture of aromatic and non-aromatic hydrocarbons, there are three major thermal and material cycles: the solvent cycle, the hydrocarbon cycle, ... | 01/05/1993 |
| 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 |
| 5073669 | Method for aromatic hydrocarbon recovery Methods are provided for the recovery of aromatic hydrocarbons from the extract phase of aromatic-selective solvent extraction processes which involve withdrawing a vapor side-cut fraction containing aromatic hydrocarbons and solvents from a stripping zon... | 12/17/1991 |
| 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 |
| 5008004 | Aromatics extraction process having improved water stripper Processes are disclosed for the recovery of aromatic extraction solvent from the raffinate phase of aromatic extraction processes. The raffinate phase is washed with water that is obtained in part by condensing a portion of the steam generated for strippi... | 04/16/1991 |
| 5006222 | Solvent dewaxing of lubricating oils An improvement has been discovered in a process for solvent dewaxing a hydrocarbon lubricating oil stock. Solvent dewaxed oils are steam stripped and then vacuum dehydrated at 2.5 psia at the steam stripping temperature of 350° F. to 450° F. Nitrogen or... | 04/09/1991 |
| 4997547 | Method for the production of an aromate concentrate suitable for use as blending component for fuel In the method for the production of an aromate concentrate suitable for use as blending component for gasifier fuel, feed hydrocarbon mixtures having boiling ranges substantially between 40° and 170° C., are subjected, without any previous separation in... | 03/05/1991 |
| 4992162 | Method and apparatus for heavy oil extraction The present invention provides a method and apparatus for preparing and treating a heavy oil extraction solvent. A solvent fraction is separated from a crude oil and combined with a slip stream of rerun solvent taken from an extraction process solvent rec... | 02/12/1991 |
| 4985139 | Two-step heterocyclic nitrogen extraction from petroleum oils with reduced refinery equipment A process is disclosed for the removal of basic heterocyclic nitrogen compounds from a petroleum crude oil or fraction thereof which comprises treating, the petroleum crude oil in a distillation zone to form a distillation bottoms stream which is rich in ... | 01/15/1991 |
| 4897182 | Aromatic extraction process having improved water stripper An improved process for the extraction of aromatics from a mixed feed provides additional flexibility of operation which is especially useful when the feed contains relatively large amounts of nonaromatics and therefore produces a large raffinate stream. ... | 01/30/1990 |
| 4874523 | Method for reducing the cloud point of materials using an ultrafiltration separation process A method is disclosed for reducing the cloud point of materials comprising the steps of chilling the waxy oil so as to achieve submicron crystallization followed by ultrafiltration thereby effecting separation of a permeate of reduced cloud point from a r... | 10/17/1989 |
| 4869809 | Aromatics extraction process control A process for separation of aromatic and nonaromatic hydrocarbons by solvent extraction is improved by incorporating control methods which optimize utility costs while maintaining desired product purities.... | 09/26/1989 |
| 4863587 | Method for recovery of a phenolic polymerization inhibitor A phenolic polymerization inhibitor is recovered from a styrene distillation residue containing the phenolic polymerization inhibitor by a method which comprises extracting the inhibitor from the styrene distillation residue with an oxygen-containing orga... | 09/05/1989 |
