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| Number | Title | Issue Date |
| 4776948 | Fractionation method with quench liquid recycle Method and apparatus for fractionating a hot vaporous hydrocarbon feed from a fluid catalytic cracking reactor wherein the hot vaporous feed is introduced into a fractionator zone near one end thereof and liquid is removed from a liquid collection zone an... | 10/11/1988 |
| 4776945 | Single-stage hydrotreating process A process is provided for hydrotreating hydrocarbon oils having a tendency to deactivate hydrotreating catalysts by coke formation, said oils selected from the group consisting of (a) oils having a final boiling point greater than about 1000° F. and cont... | 10/11/1988 |
| 4772379 | Extraction and liquefaction of fossil fuels using gamma irradiation and solvents A new technology for the extraction of liquid hydrocarbon products from fossil fuel resources such as oil shales, tar sands, heavy oils and coals which comprises the mixing of a donor solvent with the fossil fuel and the exposure of the mixture to ionizin... | 09/20/1988 |
| 4753721 | Process for resid hydrotreating employing feed distributor A special feed distributor is provided to radially, annularly, and uniformly feed and distribute oil and gas in a hydroprocessing unit, such as an ebullated bed reactor. In the preferred form, the feed distributor comprises an octagonal manifold with tang... | 06/28/1988 |
| 4752377 | Fluid catalyst process with steam injection into catalyst standpipe In a fluid catalytic cracking unit where oil and steam are mixed with regenerated catalyst the individual and combined improvements: (1) extending the oil-steam line into the riser reactor at least to a point where the axis of the riser is intersected by ... | 06/21/1988 |
| 4751346 | Process for separating ethylbenzene from xylenes by selective adsorption on a gallium beta zeolite (ATD-35) The invention relates to a process for selectively adsorbing ethylbenzene from a stream containing one or more isomeric xylenes. The ethylbenzene is adsorbed on a gallium Beta zeolite. A desorbent comprising para-dialkylbenzene gives the zeolite good ethy... | 06/14/1988 |
| 4750988 | Vanadium passivation in a hydrocarbon catalytic cracking process Hydrocarbons containing vanadium are converted to lower boiling fractions employing a zeolitic cracking catalyst containing a significant concentration of a calcium-containing additive as a vanadium passivating agent.... | 06/14/1988 |
| 4750990 | Membrane separation of hydrocarbons using cycloparaffinic solvents Heavy crude oils which contain metal contaminants such as nickel, vanadium and iron may be separated from light hydrocarbon oils by passing a solution of the crude oil dissolved in a cycloparaffinic hydrocarbon solvent containing from about 5 to about 8 c... | 06/14/1988 |
| 4750989 | Catalyst inventory determination An effective, efficient and safe method is provided to accurately determine the amount of catalyst in an ebullated bed reactor without depressurizing the reactor or exposing the hydrocarbon in the reactors to oxidizing, flammable, or explosive conditions.... | 06/14/1988 |
| 4749471 | Closed FCC cyclone process There is disclosed a fluid catalytic cracking (FCC) apparatus and process comprising a reactor riser zone, primary and secondary cyclones, connected in series to the riser zone, and a stripping zone. The riser zone, the primary and the secondary cyclones,... | 06/07/1988 |
| 4749469 | Process control system for multi-reactor hydrocarbon conversion processes A temperature control process is disclosed for a hydrocarbon conversion process wherein a feedstock is heated in a furnace and is partly converting in a first reactor, the effluent from the first reactor is cooled in a first heat exchanger and by adding a... | 06/07/1988 |
| 4748288 | Process for the separation of solvents from hydrocarbons dissolved in the solvents The invention is a process for the separation of solvents from hydrocarbons dissolved in the solvents which comprises contacting at elevated pressure a feed solution comprising hydrocarbons dissolved in an aromatic solvent and a polar aliphatic solvent wi... | 05/31/1988 |
| 4747912 | Cracking furnace control For parallel heat exchangers, one using a more preferred heat exchange medium as a heat exchange source and another using a less preferred heat exchange medium, maximum use of the more preferred heat exchange medium is used prior to use of the less prefer... | 05/31/1988 |
| 4748292 | Method for removing polyhalogenated hydrocarbons from non-polar organic solvent solutions A method is provided for reducing the level of polychlorinated aromatic hydrocarbons dissolved in an organic solvent which avoids the accumulation of sticky residues on the equipment utilized.... | 05/31/1988 |
| 4744887 | Solid addition and withdrawal A system for adding and withdrawing solids to a high pressure reactor wherein there is provided improved control of flow and concentrations of a slurry of solids in a transport oil for introducing and withdrawing solids from the reactor. In addition, ther... | 05/17/1988 |
| 4744884 | Process for producing lubrication oil of high viscosity index Full-range shale oils or fractions thereof, after hydrotreating, or hydrowaxed and then hydrogenated to produce lubricating oil fractions boiling above 650° F., having a pour point at or below +10° F., and a viscosity index of at least 95. In the prefer... | 05/17/1988 |
| 4743356 | Increasing resid hydrotreating conversion Resid hydrotreating conversion of resid can be substantially increased by decreasing the feed gas rate and simultaneously increasing the concentration of hydrogen in the feed gases. Hydrogen purity can be increased by increasing the flow rate of lean spon... | 05/10/1988 |
| 4741822 | Procedure for hydrogenation of coal by means of liquid phase and fixed-bed catalyst hydrogenation Procedure for hydrogenation of coal by means of liquid phase and fixed-bed catalyst hydrogenation whereby the head products of the high-temperature separator are led directly, and together with the entire high-pressure circuit gas, over a reactor with a r... | 05/03/1988 |
| 4740293 | Premium coke from a blend of pyrolysis tar and hydrotreated decant oil A premium coke is made by the delayed coking of a blend of pyrolysis tar and hydrotreated decant oil.... | 04/26/1988 |
| 4737264 | Heavy oil distillation system A fractionation method and apparatus is disclosed for separating and recovering condensed and absorbed coke vapor from residual material leaving a coker combination tower to thereby obtain increased distillate yield. A resid flash down tower is positioned... | 04/12/1988 |
| 4737263 | Process and apparatus for catalytic dewaxing of paraffinic stocks and the simultaneous removal of cracked products Dewaxing a waxy feedstock is achieved by submerging the dewaxing catalyst bed in the waxy feedstock and removing gaseous products out of contact with the catalyst by agitating the bed to prevent further cracking or polymerization. Catalyst aging during de... | 04/12/1988 |
| 4737267 | Oil shale processing apparatus and method A method and apparatus for the recovery of bitumen oils from oil shale. The method comprises crushing the oil shale to a predetermined particle size and mixing with an organic solvent to form a slurry. The slurry is then subjected to supercritical tempera... | 04/12/1988 |
| 4735703 | Method of increasing the concentration of straight chain paraffin material Concentrations of straight chain material are material are increased by treating a thermal-cracked oil distillate boiling in the range of 120° to 290° C. and containing aliphatic olefins, at a temperature of 0° to 330° C. in liquid phase in the presen... | 04/05/1988 |
| 4735704 | Liquid removal enhancement An improved process for removing free liquid from a hydrocarbon-rich gas stream is disclosed. Liquid is injected into the gas stream upstream of a chiller and downstream of an acid-gas removal system and any equipment that may affect the water content of ... | 04/05/1988 |
| 4735706 | Process and apparatus for coal hydrogenation In a coal liquefaction process an aqueous slurry of coal is prepared containing a dissolved liquefaction catalyst. A small quantity of oil is added to the slurry and then coal-oil agglomerates are prepared by agitation of the slurry at atmospheric pressur... | 04/05/1988 |
| 4732665 | High severity catalytic reforming process An improved catalytic reforming process. The process is operated at high severity in order to obtain a reformate product having an enhanced octane rating. Higher octane reformate is required to compensate for the reduction or total elimination of lead-bas... | 03/22/1988 |
| 4731175 | Preheat control for a fractional distillation process A computer control system for automatically optimizing the temperature of the feed supplied to a distillation column from a fuel fired preheat furnace, wherein the furnace temperature is manipulated in response to a measured ratio of distillate flow (D) f... | 03/15/1988 |
| 4728414 | Solvent dewaxing using combination poly (n-C24) alkylmethacrylate-poly (C8 -C20 alkyl (meth-) acrylate dewaxing aid Solvent dewaxing of waxy hydrocarbon oils is improved by using a poly (n-C24) alkyl methacrylate polymer dewaxing aid in combination with lower melting point weight poly (C8 -C20) alkyl methacrylate polymer dewaxing aids. ... | 03/01/1988 |
| 4728413 | Agitated dewaxing employing modified agitator means The filtration performance of a slurry containing crystallized wax, dewaxed oil and dewaxing solvent is improved by use of an agitator means which possesses a characteristic dimension which when divided by the average wax crystal diameter yields a dimensi... | 03/01/1988 |
| 4727218 | Procedure and means for separating or purifying organic substances Method and apparatus for separating and/or purifying a substance from a molten mixture by crystallization, in which the molten mixture is conducted into an annular space defined by two substantially curvilinearly-shaped surfaces, one of the surfaces being... | 02/23/1988 |
| 4726894 | Distillation cut point control Cut point is controlled in a distillation process by monitoring the partial pressure in a stripper.... | 02/23/1988 |
| 4726893 | Catalytic crackins process control For parallel heat exchangers, one using a more preferred heat exchange medium as a heat exchange source and another using a less preferred heat exchange medium, maximum use of the more preferred heat exchange medium is used prior to use of the less prefer... | 02/23/1988 |
| 4725350 | Process for extracting oil and hydrocarbons from crushed solids using hydrogen rich syn gas Process and apparatus for extraction of oil and hydrocarbons from crushed hydrocarbonaceous solids, such as tar sands, involving the pyrolyzing of the said solids with syn gas rich in hydrogen, and preferably syn gas obtained from the gasification of coal... | 02/16/1988 |
| 4722783 | Conditioning of recycle shale in retorting process Burned oil shale recycled as heat transfer solids in retorting process conditioned under reducing conditions with hydrocarbon to improve product yield.... | 02/02/1988 |
| 4721560 | Static mixer retorting of oil shale Oil shale is well mixed and efficiently, effectively, and economically retorted in a special gravity flow retorting process and system which utilizes novel arrangements of internal baffles in a static mixer.... | 01/26/1988 |
| 4721557 | Combination process for the conversion of a residual asphaltene-containing hydrocarbonaceous stream to maximize middle distillate production A process for the conversion of residual asphaltene-containing hydrocarbonaceous charge stock to selectively produce large quantities of high quality middle distillate while minimizing hydrogen consumption.... | 01/26/1988 |
| 4720337 | Hydrodewaxing method with interstage separation of light products A catalytic dewaxing process in which a hydrocarbon feed, usually a lubricant feed, is catalytically dewaxed in at least two catalytic dewaxing stages with an interstage separation of the light ends which are subjected to hydrogenation to saturate the ole... | 01/19/1988 |
| 4720338 | Premium coking process A process for providing more uniform premium coke in a delayed coking operation by adding an aliphatic petroleum fraction to the premium coking feed during the latter part of the coking cycle. Preferably the aliphatic petroleum fraction is added gradually... | 01/19/1988 |
| 4717468 | Distillation process control for maximum recovery using minimum energy An improved distillation process and apparatus are provided whereby liquid product recovery other than bottom product is maximized and feed stream heating is minimized. Inert gas streams combined with the feed stream and introduced into the distillation t... | 01/05/1988 |
| 4717467 | Process for mixing fluid catalytic cracking hydrocarbon feed and catalyst A process and apparatus for mixing fluid catalytic cracking hydrocarbon feed and catalyst is disclosed. The invention passes lift gas through a first conduit which is axially aligned with a second conduit. A downstream end of the first conduit and an upst... | 01/05/1988 |
