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| Number | Title | Issue Date |
| 7332070 | Method of preventing heat exchanger fouling A specific nonionic surfactant is added to a component mainly comprising hydrocarbons before passing through a heat exchanger in a petrochemical plant or a polyolefin production plant, whereby fouling of the heat exchanger can be efficiently prevented, that is, the ... | 02/19/2008 |
| 7270713 | Tunable gas distribution plate assembly A gas distribution plate assembly and a method for distributing gas in a processing chamber are provided. In one embodiment, a gas distribution plate assembly includes a tuning plate coupled to a diffuser plate. The tuning plate has a plurality of orifice holes form... | 09/18/2007 |
| 7008460 | Process for the production thermally converted light products and electricity Process for the production of thermally converted light products from residual feedstock and electricity from syngas obtained from thermal conversion residue as feedstock, in which process flue gas exiting from the electricity producing unit is fed through a heat re... | 03/07/2006 |
| 6679975 | Process for recovering the methanol contained in a liquid hydrocarbon feed The present invention aims to isolate the azeotropes formed in a distillation column (B1) by methanol, propane and butane. The azeotropes are then liquefied in heat exchanger (E2) and mixed in contactor (M1) with water in order to dissolve the methanol in... | 01/20/2004 |
| 6590132 | Separation of monomer from oligomer with lower bottoms temperature The process disclosed separates light olefins from heavy oligomers in a distillation column with an intermediary having a boiling point between the light olefin and the heavy oligomer in the column feed. The invention contemplates separating C4... | 07/08/2003 |
| 6579442 | Methods and compositions for inhibiting polymerization of vinyl monomers Methods and compositions for inhibiting the polymerization of vinyl monomers are disclosed. Combinations of nitroxyl compounds and aliphatic amines are effective at inhibiting the polymerization of vinyl monomers under both processing and storage conditio... | 06/17/2003 |
| 6413378 | Apparatus for separation and purification of saturated hydrocarbon and method for separation and purification An extractive distillation tower 4 supplied with a feedstock containing butadiene and a solvent and for distilling the feedstock to separate and purify the butadiene. The tower 4 includes sensors 32, 34 for detecting concentrations of specific impurities ... | 07/02/2002 |
| 6395943 | Process for inhibiting the polymerization of vinyl aromatic compounds A process is disclosed for inhibiting the polymerization of vinyl aromatic compounds, such as styrene, during its distillation. The process involves adding a mixture of at least two inhibitors to the vinyl aromatic compound. One such combination is N... | 05/28/2002 |
| 6395951 | Adsorptive separation product recovery by fractional distillation Construction and operational costs of recovering the extract or raffinate product of a simulated moving bed adsorptive separation process units are reduced by employing a dividing wall column to perform the separation. The raffinate or extract stream is p... | 05/28/2002 |
| 6395942 | Increasing the thermal stability of a vinyl aromatic polymerization inhibitor Compounds that inhibit polymerization of vinyl aromatic compounds need to operate at temperatures of about 90° C. to about 150° C. A process for increasing the thermal stability of inhibitors such as N,N'-di-2-butyl-N,N'-dinitroso-1,4-diaminobenzene is ... | 05/28/2002 |
| 6278035 | Process for C2 recovery An improved process for separating a hydrocarbon bearing feed gas containing methane and lighter, C2 (ethylene and/or ethane), and heavier components into a fraction containing predominantly methane and lighter components and a fraction contain... | 08/21/2001 |
| 6258258 | Process for treatment of petroleum acids with ammonia The present invention is a process for decreasing the acidity of a starting acidic crude oil by contacting an acidic crude with an effective excess of ammonia dissolved in said crude to form an ammonia-continuous oil discontinuous phase at a temperature a... | 07/10/2001 |
| 6054496 | Method for transporting a heavy crude oil produced via a wellbore from a subterranean formation to a market location and converting it into a distillate product stream using a solvent deasphalting process A method for producing a heavy crude oil from a subterranean formation through a wellbore, transporting the heavy crude oil to a market location and converting the heavy crude oil into a product distillate hydrocarbon stream and by-products such as heat, ... | 04/25/2000 |
| 6030523 | Process for neutralization of petroleum acids (LAW810) The present invention describes a process for decreasing the acidity of a starting calcium containing, non-acid treated acidic crude oil by adding such an acidic crude oil to an effective amount of an aqueous base solution at conditions of pH and temperat... | 02/29/2000 |
| 6024866 | Method of scavenging hydrogen sulfide from hydrocarbons Hydrocarbons, gas mixtures of hydrocarbons, and the like containing hydrogen sulfide are brought into intimate contact with a hydrogen sulfide scavenger prepared by reacting an alkylenepolyamine with formaldehyde, whereby the amount of hydrogen sulfide in... | 02/15/2000 |
| 5980733 | Method of removing sulfur compounds from hydrocarbon streams A method of removing hazardous sulfur compounds, such as hydrogen sulfide, mercaptans and sulfur oxides, from a fluid stream comprising contacting the fluid stream with an aqueous composition comprised of a tertiary amine oxide. The amine oxide reacts wit... | 11/09/1999 |
| 5976359 | Methods for reducing the concentration of amines in process and hydrocarbon fluids Disclosed is a method for reducing the concentration of amines in hydrocarbon fluids and process streams by generating therein a nitrosating agent. The nitrosating agent will react with the amines to form innocuous by-products under refinery process condi... | 11/02/1999 |
| 5951853 | Refinery atmospheric pipestill with ammonia stripping In an atmospheric pipestill stripping process where steam is utilized as the stripping gas to strip bottoms and side stream products, the improvement comprising utilizing ammonia or a ammonia and steam mixture as said stripping gas wherein when an ammonia... | 09/14/1999 |
| 5935423 | Method for producing from a subterranean formation via a wellbore, transporting and converting a heavy crude oil into a distillate product stream A method for producing a heavy crude oil from a subterranean formation via a wellbore, transporting the heavy crude oil to a market and producing a distillable hydrocarbonaceous stream from the crude oil, the method includes: producing the heavy crude oil... | 08/10/1999 |
| 5929125 | Method for producing heavy crude oil via a wellbore from a subterranean formation and converting the heavy crude oil into a distillate product stream A method for producing a heavy crude oil from a subterranean formation through a wellbore and converting the heavy crude oil into a product distillate hydrocarbon stream and at least one of heat, steam, electricity and synthesis gas by separating distilla... | 07/27/1999 |
| 5837130 | Catalytic distillation refining A process for hydrotreating petroleum fractions early in the refining process by employing catalyst prepared as components of distillation structures or as contained beds of catalyst in atmospheric distillation columns and or side draw columns. For exampl... | 11/17/1998 |
| 5807476 | Method of removing sulfur compounds from sour crude oil and sour natural gas A method of removing hazardous sulfur compounds, such as hydrogen sulfide and sulfur dioxide, from sour crude oil and sour natural gas. An aqueous composition of an amine oxide surfactant, and preferably a mixture of an amine oxide surfactant and enzymes,... | 09/15/1998 |
| 5800738 | Methods for inhibiting foam in crude oils Methods for inhibiting foam in crude oil or its fractions undergoing processing are disclosed. Low molecular weight polyisobutylene, preferably of about 320 daltons, is added to the crude oil or fraction experiencing foaming.... | 09/01/1998 |
| 5643439 | Process for neutralization of petroleum acids using alkali metal trialkylsilanolates The invention relates to a process for treating naphthenic acid-containing whole crudes or fractions thereof to reduce or eliminate their acidity by contacting the acidic whole crude at a temperature of from about 60° C. to 170° C. with a neutralizing a... | 07/01/1997 |
| 5641396 | Use of 2-amino-1-methoxypropane as a neutralizing amine in refinery processes 2-amino-1-methoxypropane is used as a neutralizing amine in crude oil distillation units. The amine of the invention gives superior neutralization at the first initial condensate compared to other commonly used neutralizing amines.... | 06/24/1997 |
| 5556575 | Corrosion inhibition in refineries using the reaction product of hydrocarbyl succinic anhydride and an amine Disclosed are a method for inhibiting corrosion in crude oil distillation towers, an improvement in crude oil fractionation, a method for dispersing iron sulfide in a hydrocarbon stream and a hydrocarbon dispersion using the reaction product of hydrocarby... | 09/17/1996 |
| 5545313 | Desalting process for primary fractionator A simplified solution to the problem of salt precipitation on the trays of a the FCC main column removes salt or salt forming compounds from an naphtha slip stream. The invention removes solubilized salt from the a cooled naphtha fraction of the main colu... | 08/13/1996 |
| 5472637 | Control of foam in hydrocarbon fluids A method and composition for foam control in non-aqueous systems utilizing polyisobutylene compounds. The method is especially well adapted for use in oil distillation units and coking of crude oil residues.... | 12/05/1995 |
| 5468367 | Antifoulant for inorganic fouling A salt of polyacrylic acid having a molecular weight of between 1,000 and 50,000, preferably 1,000 to 5,000, is used to inhibit inorganic fouling in crude oil.... | 11/21/1995 |
| 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 |
| 5454979 | Fluorosilicone antifoam A fluorosilicone antifoam having excellent and persistent anti foam activity against foaming in aqueous or organic solvent solutions in which a silicone surfactant or fluorosurfactant is dissolved. The fluorosilcione antifoam includes (A) (a) a fluorosili... | 10/03/1995 |
| 5326482 | On-line acid monitor and neutralizer feed control of the overhead water in oil refineries A method and apparatus for automatically measuring the acidity of overhead water in an oil refinery, and dispensing a neutralizing agent into the refinery system at a rate responsive to that measurement. A sample of overhead water is collected and passed ... | 07/05/1994 |
| 5284576 | Method of scavenging hydrogen sulfide from hydrocarbons Hydrocarbons, gas mixtures of hydrocarbons, and the like containing hydrogen sulfide are brought into intimate contact with a hydrogen sulfide scavenger prepared by reacting an alkylenepolyamine with formaldehyde, whereby the amount of hydrogen sulfide in... | 02/08/1994 |
| 5266185 | Method of suppression of hydrogen sulfide with heterocyclic-amine aldehyde reaction products Hydrogen sulfide evolution in a heavy hydrocarbon (such as a residual fuel oil) derived from a heavy crude oil (such as a API 8 gravity crude) is suppressed by contacting the hydrocarbon with a compound corresponding to the reaction product of a heterocyc... | 11/30/1993 |
| 5258113 | Process for reducing FCC transfer line coking Coke formation/deposition within and downstream of catalytic cracking reactors is suppressed by adding a coke suppressing additive to the cracking reactor and/or cracked product vapor. Free radical inhibitors, such as oxygenates, are preferred. The additi... | 11/02/1993 |
| 5238541 | Process for production of an ether-rich additive A process for the production of an ether-rich additive for gasoline, and more particularly, the production of TAME from light hydrocarbon streams by admixing the light hydrocarbon stream, preferably from an FCC feedstock, prior to distillation of the feed... | 08/24/1993 |
| 5225159 | Deodorization of sewage sludge-derived oils A method is provided for treating a sewage sludge-derived oil having a particular chemical composition, to reduce its odor. The method includes the first step of distilling the sewage sludge-derived oil to 150° C. to remove water and volatile organic com... | 07/06/1993 |
| 5211840 | Neutralizing amines with low salt precipitation potential A process for adding an amine having a pKa of between 5 and 8 to a petroleum refinery distillation unit for the purpose of neutralizing acidic species contained in the hydrocarbon feedstock. The use of these amines raises the dew point pH sufficiently to ... | 05/18/1993 |
| 5182013 | Naphthenic acid corrosion inhibitors Naphthenic acid corrosion in refinery distillation units is inhibited by introducing into the units effective amounts of a polysulfide corrosion inhibitor.... | 01/26/1993 |
| 5173173 | Trace contaminant removal in distillation units A hydrocarbon feedstock is simultaneously distilled into two or more fractions while trace concentrations of contaminants in the feedstock are absorbed onto a sorbent packing material during distillation operation. The sorbent packings contain active meta... | 12/22/1992 |
