Soaking Patents (Class 208/131)
-
Patent number: 4836909Abstract: A process of thermally cracking a heavy petroleum oil wherein the heavy petroleum oil is treated successively in a cracking furnace and then in a perfect mixing type tank reactor. The thermal cracking in the cracking furnace is performed at a temperature at the outlet of the cracking furnace of 450.degree.-520.degree. C. with a conversion of at least 60-75% of the overall conversion rate while the thermal cracking in the tank reactor is performed at a temperature of 400.degree.-450.degree. C. a pressure of from ambient pressure to 1 kg/cm.sup.2 for a period of time of less than 30 minutes but not less than 10 minutes while feeding steam having a temperature of 435.degree.-700.degree. C. to the tank reactor in an amount of 8-20% by weight of the heavy petroleum oil fed to the cracking furnace.Type: GrantFiled: September 9, 1987Date of Patent: June 6, 1989Assignee: Research Association for Residual Oil ProcessingInventors: Itaru Matsuo, Yuzo Takahashi, Hideo Hashimoto, Toru Takatsuka, Takeru Iimori, Hitoshi Maekawa, Tamotsu Ito, Yoshihiko Shohji, Ryuzo Watari, Hiroshi Aida
-
Patent number: 4832823Abstract: An improved coking process is described wherein a feedstock comprising residual oil is passed into a coking zone along with a highly aromatic oil such as pyrolysis tars or a decanted oil produced from a fluidized catalytic cracking zone in a concentration resulting in the feedstock having froma bout 5 to about 20 percent by weight of highly aromatic oil. The yield of coke is thereby reduced.Type: GrantFiled: April 21, 1987Date of Patent: May 23, 1989Assignee: Amoco CorporationInventors: Shri K. Goyal, Gary S. Faagau
-
Patent number: 4828682Abstract: This invention relates to a coking unit for producing coke articles of good quality from feed material heavy oils with a variety of properties and more specifically relates to a delayed coking unit comprising a heating furnace and coking drums connected in this sequence with piping. This invention is characterized in that an intermediate drum independently equipped with pressure and temperature controlling means is provided, said intermediate drum being small in volume in comparison with that of said coking drum, so that substantially all of the amount of products treated in said intermediate drum is supplied into the coking drum.Type: GrantFiled: May 12, 1987Date of Patent: May 9, 1989Assignee: Koa Oil Company, LimitedInventors: Kosaku Noguchi, Honami Tanaka, Heima Yamazaki, Yoshiharu Ohmoto
-
Patent number: 4822479Abstract: Properties of premium coke are improved by coking the feed at a temperature lower than the normal coking temperature and thereafter subjecting the coke to a heat soak at substantially the same temperature as the temperature at which the coke was formed.Type: GrantFiled: November 27, 1987Date of Patent: April 18, 1989Assignee: Conoco Inc.Inventors: Ta-Wei Fu, Bruce A. Newman
-
Patent number: 4814064Abstract: A process for the conversion of an aromatic-rich, residual hydrocarbonaceous charge stock which possesses an aromatic hydrocarbon concentration greater than about 20 volume percent to selectively produce large quantities of high quality middle distillate while minimizing hydrogen consumption which process comprises the steps of: (a) reacting at least a portion of the residual hydrocarbonaceous charge stock and a hereinafter-described paraffin-rich, distillable hydrocarbonaceous stream boiling at a temperature greater than about 700.degree. F. (371.degree. C.) in a thermal coking zone at mild thermal coking conditions selected to provide thermal coking zone effluent rich in middle distillate; (b) separating the thermal coking zone effluent to provide a middle distillate fraction boiling in the range from about 300.degree. F. (149.degree. C.) to about 700.degree. F. (371.degree. C.) and a distillate hydrocarbonaceous stream boiling at a temperature greater than about 700.degree. F. (371.degree. C.Type: GrantFiled: August 27, 1987Date of Patent: March 21, 1989Assignee: UOP Inc.Inventors: Darrell W. Staggs, Laurence O. Stine, Te-yu M. Chen
-
Patent number: 4814065Abstract: Disclosed is a method for accelerating the exchange of hydrogen between a hydrogen donor and a petroleum resid to be subjected to cracking, visbreaking, or coking. Acceleration is effected by incorporating an aqueous solution of ammoniun sulfide into the mixture of donor and resid and subjecting the mixture to a period of heat-soaking at an elevated temperature.Type: GrantFiled: September 25, 1987Date of Patent: March 21, 1989Assignee: Mobil Oil CompanyInventor: Lillian A. Rankel
-
Patent number: 4814063Abstract: Described is the method of producing the super needle coke from graphite electrodes, wherein the starting material derived from coal tar or the starting material derived from coal tar and containing less than 0.1 weight percent of the dry sludges or quinoline insolubles is subjected to hydrogenation in the present of hydrogenation catalyst to give the hydrogenated oil which is further subjected to thermal cracking under the controlled condition and non-volatile components contained in thermally cracked oil are removed to give the starting coking material from the distillate these of which is subjected to delayed coking.The thermal cracking conditions are selected from the conditions in which the pressure range is up to 3.9 MPa (40 kg/cm.sup.2 G.). The temperature is 470.degree. to 520.degree. C. and the cold residence time is to to 350 seconds, while the coking conditions are selected from the conditions in which the temperature ranged is over 450.degree. to 465.degree. C. and the pressure range is over 0.Type: GrantFiled: September 8, 1987Date of Patent: March 21, 1989Assignee: Nippon Kokan Kabushiki KaishaInventors: Tadashi Murakami, Mikio Nakaniwa, Yoshio Nakayama
-
Patent number: 4808289Abstract: Resid hydrotreating conversion of resid can be substantially increased by blending the resid with high-temperature flash drum oil before being hydrotreated in a train of ebullated bed reactors. The high-temperature flash drum oil also improves the overall thermal efficiency of the process.Type: GrantFiled: July 9, 1987Date of Patent: February 28, 1989Assignee: Amoco CorporationInventors: Norman K. McDaniel, Nicholas C. Vasti, Norman R. Woods, Robert E. Boening
-
Patent number: 4797197Abstract: The impediments of the prior art of delayed coking to enhanced hydrocarbons and minimum coke yields by way of pressure, temperature and recycle ratio have been minimized through the use of an interim drum between the heater and the coke drum, called in this invention as the flasher drum, whereby the heater effluent's vapor is separated from its liquid portion which serves as the feed to the coke drum. The vapors from the flasher and coke drums are hence combined and fed to the fractionator for separation of products. This process of separating the coke drum and flasher drum vapors effects the control of hydrocarbon partial pressure and therefore the subsequent controlled vaporization of the heavy hydrocarbons in the coke drum which would otherwise react extensively in repetitive fashion to produce more coke than necessary.Type: GrantFiled: January 6, 1986Date of Patent: January 10, 1989Inventor: Renato M. Mallari
-
Patent number: 4795548Abstract: A process for the production of anode grade coke from a hydrocarbon feed characterized by high levels of sulfur and metals comprises subjecting a vacuum resid to a fluidized bed coking process so as to produce gas, distillates, coke and a residual bottom stream, filtering the residual stream so as to remove solids and thereafter coking the filtered stream.Type: GrantFiled: October 27, 1986Date of Patent: January 3, 1989Assignee: Intevep, S.A.Inventors: Leon E. Velasco R, Rafael O. Hidalgo, Joaquin Rodriguez, Wolfgang Garcia
-
Patent number: 4762608Abstract: Pyrolysis tars are upgraded by hydrotreatment in the presence of a catalyst having a hydrogenation component and an acidic component. The treated pyrolysis tars are used to produce premium cokes useful in the production of graphite electrodes.Type: GrantFiled: December 20, 1984Date of Patent: August 9, 1988Assignee: Union Carbide CorporationInventors: Rostislav Didchenko, Eric M. Dickinson
-
Patent number: 4758329Abstract: In a delayed premium coking process utilizing as feedstock an aromatic mineral oil having a high aromatic content and a low molecular weight, coke CTE is reduced and coke particle size is increased by sparging with a gas during the coking cycle.Type: GrantFiled: March 2, 1987Date of Patent: July 19, 1988Assignee: Conoco Inc.Inventors: Bruce A. Newman, Ta-Wei Fu
-
Patent number: 4756820Abstract: The present invention is directed to a method of reducing fouling and corrosion in furnaces during the thermal cracking of hydrocarbons. The method generally comprises adding to the hydrocarbon an effective amount of boron or boron compounds. The preferred boron materials are the oxides, borates, borate esters, peroxyborates, boranes, organoboranes, borazine and salts of boron oxides. The oxides, borates or salts thereof, are preferable in non-mono-alcohol solvents.Type: GrantFiled: July 8, 1986Date of Patent: July 12, 1988Assignee: Betz Laboratories, Inc.Inventors: Dwight K. Reid, David R. Forester
-
Patent number: 4750985Abstract: A carbonaceous feed, such as a heavy hydrocarbonaceous oil or coal and mixtures thereof, is upgraded by a combination coking and catalytic slurry hydroconversion process which may be integrated with a deasphalting process.Type: GrantFiled: December 6, 1985Date of Patent: June 14, 1988Assignee: Exxon Research and Engineering CompanyInventors: Clyde L. Aldridge, Roby Bearden, Jr., Clarence M. Eidt, Jr.
-
Patent number: 4740293Abstract: A premium coke is made by the delayed coking of a blend of pyrolysis tar and hydrotreated decant oil.Type: GrantFiled: January 30, 1985Date of Patent: April 26, 1988Assignee: Union Carbide CorporationInventors: Eric M. Dickinson, Arthur W. Moore
-
Patent number: 4740291Abstract: Pyrolysis tars are upgraded by hydrotreatment thereof in the presence of an acidic catalyst. The treated pyrolysis tars are used to produce premium cokes useful in the production of graphite electrodes.Type: GrantFiled: December 20, 1984Date of Patent: April 26, 1988Assignee: Union Carbide CorporationInventors: Rostislav Didchenko, Eric M. Dickinson
-
Patent number: 4737261Abstract: The invention disclosed in this application is a process for the production of a premium grade needle coke which is historically feedstock dependent. The selected feedstock for this process is a hydrotreated SRC material (solvent refined coal) which produces a premium grade needle coke having a low ash, low sulfur and low solids content. The hydrotreating of the SRC material, before conversion to the premium grade needle coke, changes the molecular structure of the product by putting hydrogen therein and results in a different arrangement of the aromatic molecules in the resultant premium grade needle coke.Type: GrantFiled: October 5, 1984Date of Patent: April 12, 1988Assignee: International Coal Refining CompanyInventor: David Hoover
-
Patent number: 4737264Abstract: 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 between the coker combination tower and a delayed coke furnace and operated to recover the higher value liquid product from the residual material containing absorbed coke vapor.Type: GrantFiled: May 29, 1987Date of Patent: April 12, 1988Assignee: Mobil Oil CorporationInventors: William F. Heaney, Albert R. Nitsch
-
Patent number: 4724064Abstract: The present disclosure is directed to methods and compositions for controlling undesirable coke formation and deposition commonly encountered during the high temperature processing of hydrocarbons. During the processing of hydrocarbon, coke formation and, in particular, filamentous coke formation can be inhibited by adding a sufficient amount of a boron compound from the group of metal borides, boron oxide compounds, and boric acid which is substantially free of water. The boron oxide compounds are particularly effective, especially when utilized in a non-polar organic liquid carrier.Type: GrantFiled: November 17, 1983Date of Patent: February 9, 1988Assignee: Betz Laboratories, Inc.Inventor: Dwight K. Reid
-
Patent number: 4720338Abstract: 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 and is increased in quantity over the period of addition.Type: GrantFiled: November 3, 1986Date of Patent: January 19, 1988Assignee: Conoco Inc.Inventors: Bruce A. Newman, John K. Shigley, Ta-Wei Fu
-
Patent number: 4715945Abstract: A new and novel process is described for preparing an aromatic pitch having a high liquid crystal fraction and being suitable for carbon artifact manufacture, such as for the manufacture of pitch carbon fiber.Type: GrantFiled: May 9, 1983Date of Patent: December 29, 1987Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ghazi Dickakian
-
Patent number: 4713168Abstract: In a delayed premium coking process the particle size of the premium coke is increased by the addition of a Lewis acid such as aluminum chloride to the coking process. Preferably the aluminum chloride is added during the latter part of the coking cycle.Type: GrantFiled: August 29, 1986Date of Patent: December 15, 1987Assignee: Conoco Inc.Inventor: Bruce A. Newman
-
Patent number: 4698313Abstract: A delayed coker control system wherein the hydrocarbon feed flows to the coker furnace is automatically limited to the lowest of the maximum allowable flows to avoid furnace zone flooding, an air-limited furnace and overfilling of the coke drum in the cycle time. Flows among the separate furance zones are adjusted to balance heat loads on each stream and to redistribute excess flow to non-flooding zones.Type: GrantFiled: February 7, 1986Date of Patent: October 6, 1987Assignee: Phillips Petroleum CompanyInventor: William S. Stewart
-
Patent number: 4695367Abstract: Diesel range fuel is produced in excess of gasoline range fuel from virgin hydrocarbon oils having low carbon content by heat soaking under mild thermal cracking conditions carried out at low pressure wherein the cracked fractions are removed substantially as they are formed.Type: GrantFiled: March 24, 1986Date of Patent: September 22, 1987Assignee: The M. W. Kellogg CompanyInventors: Daniel D. Ezernack, Robert B. Armstrong
-
Patent number: 4686027Abstract: A delayed coking process and a solvent deasphalting process are combined so that an asphalt mix of asphalt and solvent from the solvent deasphalting process is sent as feedstock to the delayed coking process to form coke and intermediate hydrocarbon vapor and liquid products. The vaporization of the solvent in a delayed coker heater assists the flow of the asphalt mix through the heater, and a portion of the asphalt mix is directed to a delayed coking fractionator so that the flow of solvent through the delayed coking heater can be adjusted by varying the relative amounts of asphalt mix sent to the delayed coker heater and to the fractionator. A deasphalted oil mix of deasphalted oil and solvent from the solvent deasphalting process is heated by hotter fluid products from a fractionator in the delayed coking process, and makeup solvent to a solvent deasphalting section is heated by vapors in the fractionator overhead.Type: GrantFiled: July 2, 1985Date of Patent: August 11, 1987Assignee: Foster Wheeler USA CorporationInventors: Jorge A. Bonilla, John D. Elliott
-
Patent number: 4676886Abstract: The present invention is drawn to a process for the production of anode grade coke from a hydrocarbon feed characterized by high levels of sulfurs and metals. The hydrocarbon feed is hydrocracked in a hydrocracking reactor so as to produce an overhead effluent which is fed to a hot separator wherein a light hydrocarbon stream and a slurry hydrocracked product are produced. The hydrocracked product is fed to a separator and mixed with a solvent wherein the solids are separated out from the hydrocracked residual so as to produce a clean hydrocracked residual which is fed to a coking drum and coked so as to leave a mass of green anode grade coke.Type: GrantFiled: August 4, 1986Date of Patent: June 30, 1987Assignee: Intevep, S.A.Inventors: Georgette Rahbe, Roger Marzin, Ivan Cavicchioli, Julio Krasuk, Rodolfo B. Solari
-
Patent number: 4670133Abstract: A fractionation method and apparatus is disclosed for separating and recovering condensed and absorbed coke drum vapor from residual material leaving a coker combination tower to thereby obtain increased distillate yield. A resid flash down tower is positioned between the coker combination tower and a delayed coke furnace and operated to recover the higher value liquid product from the residual material containing absorbed coke drum vapor.Type: GrantFiled: December 12, 1984Date of Patent: June 2, 1987Assignee: Mobil Oil CorporationInventors: William F. Heaney, Albert R. Nitsch
-
Patent number: 4666585Abstract: A process for producing delayed petroleum coke wherein petroleum sludge is added to liquid hydrocarbon coker feedstock.Type: GrantFiled: August 12, 1985Date of Patent: May 19, 1987Assignee: Atlantic Richfield CompanyInventors: Dale A. Figgins, J. Jay Grove
-
Patent number: 4663018Abstract: The present invention is directed to a method of inhibiting the formation of coke during the elevated temperature processing of hydrocarbons. The method generally comprises adding to the hydrocarbon an effective amount of an ammonium borate, particularly ammonium biborate and ammonium pentaborate. Preferably, the ammonium borates are in a glycollic solvent or water.Type: GrantFiled: June 27, 1985Date of Patent: May 5, 1987Assignee: Betz Laboratories, Inc.Inventors: Dwight K. Reid, David R. Foster
-
Patent number: 4663026Abstract: A process for recovering HF catalyst and acid soluble oil from an HF alkylation unit acid stream containing HF and acid soluble oils. The acid stream is charged to a distillation column, wherein free HF acid, and stripping fluid added to the column, are removed as an overhead fraction. A bottoms fraction is removed from this column containing acid soluble oil and some HF. This bottoms fraction is cooled and mixed with a light hydrocarbon, and the mixture is allowed to settle. The mixture separates into an HF-lean acid soluble oil, plus solvent upper phase and an HF-rich acid soluble oil lower phase. The HF-lean phase may be withdrawn from the process as a product or upgraded to improve its quality, permitting recycle of the HF-rich phase with reduced acid soluble oil content, to the alkylation unit.Type: GrantFiled: September 4, 1985Date of Patent: May 5, 1987Assignee: Mobil Oil CorporationInventors: Yuk-Mui Louie, Fred S. Zrinscak
-
Patent number: 4661240Abstract: The sulphur emissive capability, on combustion, of coke which is formed during upgrading of sulphur-containing heavy crude oils, including oil sands bitumen, and residua, is decreased by the addition of calcium carbonate, calcium hydroxide or calcium oxide, in particulate form, to the heavy crude oil prior to coking, and uniformly dispersing the same therein. The presence of the calcium compound leads to an increased yield of liquid distillates from the coking process under the coking conditions. For calcium carbonate, the Ca:S ratio is about 1:5 to 1:1 and the coking temperature is about 400.degree. to 500.degree. C. For calcium hydroxide and calcium oxide, the Ca:S ratio is about 1:3 to 1:1 and the coking temperature is about 450.degree. to about 500.degree. C.Type: GrantFiled: March 20, 1984Date of Patent: April 28, 1987Assignee: Alberta Research CouncilInventors: Michael A. Kessick, Zacharia M. George, Linda G. Schneider
-
Patent number: 4661241Abstract: A delayed coking process having improved liquid yield and liquid product distribution relative to coke yield is characterized by the absence of heavy recycle. The coker feedstock is heated in the coker furnace and led to the coker drums where coking takes place and the vaporous effluence are passed to a fractionator from which the heavy gas oil fraction is removed as product. Process heat is conserved by indirect heat exchange of the feedstock with the coking products prior to the feedstock entering the coking furnace. A further improvement in liquid yield and selectivity is obtained by adding a solvent or diluent to the feedstock and this may be either a hydrocarbon fraction such as a coker distillate, a light gas oil or another fraction having an end point below 450.degree. C.; in addition, it may be used in conjunction with a reactive or nonreactive gas such as nitrogen, steam, hydrogen or hydrogen sulfide.Type: GrantFiled: April 1, 1985Date of Patent: April 28, 1987Assignee: Mobil Oil CorporationInventors: Michael J. Dabkowski, Madhava Malladi
-
Patent number: 4642175Abstract: The coking tendencies of heavy hydrocarbon feedstocks are reduced by treatment with a free radical removing catalyst such as a transition metal naphthenate, preferably at temperatures below 350.degree. C. The treated product has improved stability as such and may be treated in subsequent processing operations such as catalytic cracking and thermal cracking, including visbreaking and coking, with improved liquid yield and reduced coke production.Type: GrantFiled: March 19, 1985Date of Patent: February 10, 1987Assignee: Mobil Oil CorporationInventor: Leslie R. Rudnick
-
Patent number: 4624775Abstract: Coking a mixture comprised of (a) between about 60 and about 90 weight percent pyrolysis tar and (b) between about 10 and about 40 weight percent coal tar distillate, preferably by delayed coking, produces a premium coke.Type: GrantFiled: October 22, 1984Date of Patent: November 25, 1986Assignee: Union Carbide CorporationInventor: Eric M. Dickinson
-
Patent number: 4618410Abstract: An improved process for shale oil dearsenation comprises coking a retorted hale oil stream following by contacting the liquid coker product with water. Water washing is preferably carried out under ambient conditions to achieve a reduction to less than 3 ppm w soluble arsenic.Type: GrantFiled: November 4, 1985Date of Patent: October 21, 1986Assignee: The United States of America as represented by the Secretary of CommerceInventors: Frederick E. Brinckman, Thomas F. Degnan, Jr., Carl S. Weiss
-
Patent number: 4615795Abstract: A process and system for the production of olefins from heavy hydrocarbon feedstocks. A heavy hydrocarbon feed is first pretreated at high pressure and moderate temperatures to preferentially remove coke precursors in a liquid product. The pretreated hydrocarbon is then separated into lighter and heavier fractions; the lighter fraction being further thermally cracked to produce olefins.Type: GrantFiled: December 20, 1984Date of Patent: October 7, 1986Assignee: Stone & Webster Engineering CorporationInventors: Herman N. Woebcke, Swami Narayanan, Axel R. Johnson
-
Patent number: 4612109Abstract: A defoaming composition comprising an organo siloxane polymer, an aliphatic alcohol such as 2-ethylhexanol and, optionally, a liquid carrier which can be added to a coking drum in a delayed coking process to reduce foaming. In cases where the feed stock used in the delayed coking process contains greater than one half percent total sulfur, defoaming in the coking drum can be accomplished by adding an aliphatic alcohol such as 2-ethylhexanol.Type: GrantFiled: May 16, 1985Date of Patent: September 16, 1986Assignee: NL Industries, Inc.Inventors: Edward T. Dillon, David L. Edmonds
-
Patent number: 4604186Abstract: A process for upgrading petroleum residuums by hydrogen diluent donor visbreaking employs coking of a higher boiling fraction of the visbreaker effluent wherein the hydrogen donor is also supplied to the coker feed either by excess feed to the visbreaker or by mixing a portion with the coker feed. Controlling the quantity of hydrogen donor in the visbreaker and coker feed proportionally controls the quantity of coke produced.Type: GrantFiled: November 6, 1985Date of Patent: August 5, 1986Assignee: DM International Inc.Inventors: Irvin H. Lutz, Thomas M. Wilson
-
Patent number: 4551232Abstract: Process and facility for upgrading heavy hydrocarbonaceous materials for making coke suitable for metallurgical purposes comprises mixing the heavy hydrocarbonaceous materials with a diluent having a closely controlled boiling range and subjecting the oil diluent mixture to distillation and careful fractionation so as to maximize liquid yields in the coking step.Type: GrantFiled: February 9, 1983Date of Patent: November 5, 1985Assignee: Intevep, S.A.Inventors: Jose L. Calderon, Humberto Betancourt
-
Patent number: 4549934Abstract: An internal draw tray is added to the flash zone of a coker fractionator below the coker vapor inlet to collect condensed coke drum overhead components and to keep the condensed material separate from the fresh feed to the coker furnace.Type: GrantFiled: April 25, 1984Date of Patent: October 29, 1985Assignee: Conoco, Inc.Inventors: Harlan G. Graf, Harry R. Janssen, George A. Kurdy
-
Patent number: 4547284Abstract: In the delayed coking of a coking feedstock wherein the feedstock is continuously heated in a coking heater and introduced into a coke drum, the heater is operated to provide a coke drum temperature of from 415.degree. to 455.degree. C., and, after filling of the drum to the desired level, feedstock introduction is discontinued and the coke drum contents are heated at a temperature of 450.degree. C. to 500.degree. C., and which heating temperature is at least 10.degree. C. greater than the coking temperature, by passing a non-coking vapor through the contents of the drum to reduce the volatile combustible matter content to a value of 4% to 10% by weight and thereby reduce the CTE of the formed coke. The process is applicable to the production of needle coke from various kinds of feedstocks, in particular from a petroleum feedstock wherein the feedstock is initially treated by thermal soaking in the presence of sulfur, followed by thermal cracking to increase the aromaticity.Type: GrantFiled: August 13, 1984Date of Patent: October 15, 1985Assignees: Lummus Crest, Inc., Maruzen Petrochemical Co., Ltd.Inventors: Morgan C. Sze, Thomas M. Bennett, Andre A. Simone, Dennis F. Ogren, Mikio Nakaniwa, Kenji Furukawa
-
Patent number: 4545859Abstract: A method is provided for producing needle coke comprising the steps of heating green needle coke at temperatures between about 935.degree. F. and about 1,100.degree. F. for between about 10 minutes and about 24 hours, cooling the coke to below about 250.degree. F., and calcining the coke at calcination temperatures above about 2,000.degree. F.Type: GrantFiled: April 27, 1983Date of Patent: October 8, 1985Assignee: Union Oil Company of CaliforniaInventors: Arnold E. Kelley, Michael J. Block, Milan R. Skripek
-
Patent number: 4534851Abstract: A hydrocarbon feed injection method is provided in which concentric inlet conduits carry hydrocarbon liquid and steam. Small nozzles located on the outer steam-carrying conduit discharge steam in the direction of the inner wall of the transfer line reactor to protect the inner wall from carbonaceous deposits. The hydrocarbon feed nozzles are staged along a line parallel to the longitudinal axis of the transfer line.Type: GrantFiled: June 2, 1983Date of Patent: August 13, 1985Assignee: Exxon Research and Engineering Co.Inventors: David E. Allan, Charles H. Martinez
-
Patent number: 4534854Abstract: A delayed coking process is provided in which the fresh oil is introduced into the coker product fractionator and in which a stream of heavy oil product is withdrawn from the fractionator before it can contact the fresh oil. The stream of heavy oil product withdrawn from the fractionator is subjected to solvent separation to produce a high Conradson carbon product and a low Conradson carbon product. At least a portion of the low Conradson carbon product is recovered and the high Conradson carbon product is recycled to the coking zone.Type: GrantFiled: August 17, 1983Date of Patent: August 13, 1985Assignee: Exxon Research and Engineering Co.Inventors: Harold N. Weinberg, David W. Savage, Walter Weissman
-
Patent number: 4530755Abstract: A coking process is provided in which a stream of heavy oil product, which typically is recycled to the coking zone, is first subjected to solvent separation using coker naphtha as solvent to separate the heavy oil into a high Conradson carbon content product comprising a minor portion of the coker naphtha and a lower Conradson carbon content product comprising a major portion of the coker naphtha and, thereafter, recovering the lower Conradson carbon content product and recycling the high Conradson content product, including the minor portion of coker naphtha, to the coking zone.Type: GrantFiled: October 31, 1983Date of Patent: July 23, 1985Assignee: Exxon Research and Engineering Co.Inventors: Joseph M. Ritchie, Bong H. Chang, John Sosnowski
-
Patent number: 4529501Abstract: The extent of hydrodesulfurization of coke formed by coking bitumen is enhanced by the addition of small amounts of sodium hydroxide to the bitumen prior to coking the same.Type: GrantFiled: May 29, 1984Date of Patent: July 16, 1985Assignee: Research Council of AlbertaInventor: Zacheria M. George
-
Patent number: 4528088Abstract: A coking process is provided in which a stream of heavy oil product, which typically is recycled to the coking zone, is first subjected to solvent separation using coker naphtha as solvent to separate the heavy oil into a high Conradson carbon content product comprising a minor portion of the coker naphtha and a lower Conradson carbon content product comprising a major portion of the coker naphtha and, thereafter, recycling the high Conradson content product, including the minor portion of coker naphtha, to the coking zone, and separating the lower Conradson carbon content product in the coker product fractionator.Type: GrantFiled: November 30, 1983Date of Patent: July 9, 1985Assignee: Exxon Research and Engineering Co.Inventors: Bong H. Chang, Joseph M. Ritchie
-
Patent number: 4521278Abstract: A method is provided for producing needle coke comprising the steps of heating green needle coke at temperatures between about 875.degree. F. and about 1,200.degree. F. for between about 10 minutes and about 24 hours, and, without first allowing the temperature of the coke to cool below about 250.degree. F., calcining the green needle coke at calcination temperatures above about 2,000.degree. F.Type: GrantFiled: April 26, 1983Date of Patent: June 4, 1985Assignee: Union Oil Company of CaliforniaInventors: Arnold E. Kelley, Michael J. Block, Milan R. Skripek
-
Patent number: 4521277Abstract: Apparatus for upgrading heavy hydrocarbonaceous materials for making coke suitable for metallurgical purposes comprises mixing the heavy hydrocarbonaceous materials with a diluent having a closely controlled boiling range so as to facilitate transport, dehydration and desalting of the crude oil. In addition, the diluent aids in controlling temperature and residence time of the crude thereby avoiding premature decomposition.Type: GrantFiled: February 9, 1983Date of Patent: June 4, 1985Assignee: Intevep, S.A.Inventors: Jose L. Calderon, Ignacio Layrisse
-
Patent number: 4519898Abstract: A delayed coking process is conducted at a relatively low temperature with the introduction of a gas into the coking drum to strip volatile matter from the coke product and to form coke containing 6 to 12 weight percent volatile matter. Low temperature delayed coking decreases the amount of coke yield, calculated on a volatile-free basis, and increases liquid yield.Type: GrantFiled: May 20, 1983Date of Patent: May 28, 1985Assignee: Exxon Research & Engineering Co.Inventor: David E. Allan