Plural Isomerization Stages Patents (Class 585/736)
  • Patent number: 9567534
    Abstract: A flexible process for gasoline refineries is described. The process can vary depending on the available feedstock and the desired products. At one time, the process can involve disproportionating pentanes to a product mixture including isobutane and isohexane. At other times, by switching the feedstock and operating conditions, the process can convert a mixture of C4 and C7 paraffins to a low aromatic blendstock with suitable octane and a vapor pressure lower than butanes. The process can be performed in separate stand-alone units operated at different times, or a single unit can be operated according to one process at one time and according to the other process at another time.
    Type: Grant
    Filed: April 21, 2014
    Date of Patent: February 14, 2017
    Assignee: UOP LLC
    Inventors: Tom N. Kalnes, Stuart Smith, Mary Wier, Alakananda Bhattacharyya, Hayim Abrevaya
  • Patent number: 8841499
    Abstract: Embodiments of methods and apparatuses for isomerization of paraffins are provided. In one example, a method comprises the steps of compressing a C4? hydrocarbons-containing stabilizer vapor stream to form a compressed C4? hydrocarbons-containing stabilizer stream. A C4 hydrocarbons-containing feed stream that comprises unbranched C4 hydrocarbons is contacted with a chloride-promoted isomerization catalyst in the presence of hydrogen to form a branched C4 hydrocarbons-containing reaction zone effluent. At least a portion of the compressed C4? hydrocarbons-containing stabilizer stream is combined with the branched C4 hydrocarbons-containing reaction zone effluent to form a C4 hydrocarbons-containing combined stream. The C4 hydrocarbons-containing combined stream is separated into a C3? hydrocarbons-containing stabilizer vapor stream and a C4 hydrocarbons-rich product stream that comprises branched C4 hydrocarbons.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: September 23, 2014
    Assignee: UOP LLC
    Inventors: Manoj Kumar, David James Shecterle
  • Patent number: 8513480
    Abstract: A reaction-rectification process is performed in an integrated reaction-rectification system which combines catalytic isomerization and hydroisomerization reactors and distillations zones in an integral column.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: August 20, 2013
    Assignee: “RRT”, Ltd.
    Inventors: Oleg Valerievich Giyazov, Oleg Igorevich Parputs
  • Patent number: 7727376
    Abstract: A process to prepare base oils from a Fischer-Tropsch synthesis product by (a) separating the Fischer-Tropsch synthesis product into a fraction (i) boiling in the middle distillate range and below, a heavy ends fraction (iii) and an intermediate base oil precursor fraction (ii) boiling between fraction (i) and fraction (iii), (b) subjecting the base oil precursor fraction (ii) to a catalytic hydroisomerisation and catalytic dewaxing process to yield one or more base oil grades, (c) subjecting the heavy ends fraction (iii) to a conversion step to yield a fraction (iv) boiling below the heavy ends fraction (iii) and (d) subjecting the high boiling fraction (v) of fraction (iv) to a catalytic hydroisomerisation and catalytic dewaxing process to yield one or more base oil grades.
    Type: Grant
    Filed: July 2, 2004
    Date of Patent: June 1, 2010
    Assignee: Shell Oil Company
    Inventors: Nicholas James Adams, Michiel Cramwinckel, Jan Lodewijk Maria Dierickx
  • Patent number: 7435865
    Abstract: A method for separating a mixture of hydrocarbons into fractions enriched in linear, mono-branched, or multi-branched hydrocarbons is disclosed. In particular, mono-branched alkanes are separated from a mixture of alkanes containing multi-branched, mono-branched and linear alkanes, by selectively adsorbing the mono-branched alkanes on a zeolitic adsorbent. The zeolitic adsorbent MCM-22 is particularly suitable for carrying out the method.
    Type: Grant
    Filed: August 17, 2004
    Date of Patent: October 14, 2008
    Assignee: Vrije Universiteit Brussel
    Inventors: Joeri Denayer, Refik Ocakoglu, Gino Baron
  • Patent number: 7429685
    Abstract: The invention relates to a method of isomerising a charge comprising hydrocarbons containing between 5 and 8 carbon atoms per molecule. According to the invention, said charge is separated into at least two fractions: fraction A mostly comprising hydrocarbons containing 5 or 6 carbon atoms and fraction B mostly comprising hydrocarbons containing 7 or 8 carbon atoms. Subsequently, said fractions A and B are treated separately under specific conditions in different isomerisation reaction zones.
    Type: Grant
    Filed: July 8, 2002
    Date of Patent: September 30, 2008
    Assignee: Institut Francais du Petrole
    Inventors: Christophe Bouchy, Olivier Ducreux, Elsa Jolimaitre, Paul Broutin
  • Patent number: 7267758
    Abstract: For producing very high quality base stock and for simultaneously producing high quality middle distillates, successive hydroisomerisation and catalytic dewaxmg steps are employed wherein the hydroisomerisation is carried out in the presence of a catalyst containing at least one noble metal deposited on an amorphous acidic support, the dispersion of the metal being 20%-100%. The support is preferably an amorphous silica-alumina. Catalytic dewaxing is carried out in the presence of a catalyst containing at least one hydrodehydrogenating element (group VIII) and at least one molecular sieve selected from ZBM-30, EU-2 and EU-11.
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: September 11, 2007
    Assignee: Institut Francais du Petrole
    Inventors: Eric Benazzi, Nathalie Marchal-George, Tivadar Cseri, Pierre Marion, Christophe Gueret
  • Patent number: 7250107
    Abstract: For producing basic oils and in particular very high quality oils, i.e. oils possessing a high viscosity index (VI), a low aromatics content, good UV stability and a low pour point, from oil cuts having an initial boiling point higher than 340° C., possibly with simultaneous production of middle distillates (in particular gasoils and kerosene) of very high quality, i.e. having a low aromatics content and a low pour point, the invention provides a flexible procedure for producing oils and middle distillates from a charge containing heteroatoms, i.e. containing more than 200 ppm by weight of nitrogen, and more than 500 ppm by weight of sulphur. The procedure comprises at least one hydrorefining stage, at least one stage of catalytic dewaxing on zeolite, and at least one hydrofinishing stage.
    Type: Grant
    Filed: July 23, 2001
    Date of Patent: July 31, 2007
    Assignee: Institut Francais du Petrole
    Inventors: Eric Benazzi, Christophe Gueret, Pierre Marion, Alain Billon
  • Patent number: 7132042
    Abstract: Dewaxed fuel and lubricant base stocks are made by (a) producing a synthesis gas from natural gas, (b) reacting the H2 and CO in the gas in the presence of a cobalt Fischer-Tropsch catalyst, at reaction conditions effective to synthesize a waxy hydrocarbon feed boiling in the fuel and lubricant oil ranges, which is hydrodewaxed in a first stage to produce a dewaxed fuel and a partially dewaxed lubricant fraction. The partially dewaxed lubricant fraction is separated into heavy and lower boiling fractions each of which is separately hydrodewaxed, to produce lubricant base stocks. A hydrodewaxing catalyst comprising a hydrogenation component, binder and solid acid component used to hydrodewax at least one, and preferably at least two of the waxy feed and partially dewaxed heavy and lower boiling lubricant fractions.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: November 7, 2006
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: William Berlin Genetti, Adeana Richelle Bishop, Nancy Marie Page, Gregg Johnston Howsmon, Loren Leon Ansell, Jack Wayne Johnson
  • Patent number: 6652735
    Abstract: A process for isomerization dewaxing of a hydrocarbon feed which includes contacting the hydrocarbon feed with a large pore size, small crystal size, crystalline molecular sieve and an intermediate pore size, small crystal size, crystalline molecular sieve to produce a dewaxed product with a reduced pour point and a reduced cloud point. In a preferred embodiment, the feed is contacted with the molecular sieves sequentially, first with the large pore sieve followed by the intermediate pore sieve.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: November 25, 2003
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Thomas F. Degnan, Philip J. Angevine
  • Patent number: 6602402
    Abstract: An improved process for producing very high quality base stock and for simultaneous production of high quality middle distallates, comprising successive hydroisomerisation and catalystic dewaxing steps wherein hydroisomerisation is carried out in the presence of a catalyst containing at least one noble metal deposited on an amorphous acidic support, the dispersion of the metal being less than 20%. The support is preferably an amorphous silica-alumina. Catalytic dewaxing is carried out in the presence of a catalyst containing at least one hydrodehydrogenating element (group VIII) and at least one molecular sieve (preferably zeolite). The sieve is preferable selected from NU-10, EU-1, EU-13, zeolite and ferrierite.
    Type: Grant
    Filed: May 1, 2000
    Date of Patent: August 5, 2003
    Assignee: Institut Francais du Petrole
    Inventors: Eric Benazzi, Nathalie Marchal-George, Tivadar Cseri, Pierre Marion, Christophe Gueret, Slavik Kasztelan
  • Patent number: 6503465
    Abstract: A process and/or system is provided for isomerizing a hydrocarbon feedstock comprising saturated C6 hydrocarbons by contacting the hydrocarbon feedstock, in the presence of hydrogen and optionally a chloride, with a first isomerization catalyst composition in a first isomerization reactor defining a first reaction zone operated at a first reaction temperature, withdrawing a first intermediate stream comprising cyclohexane and n-hexane from the first reaction zone, separating the first intermediate stream, via a first separator, into a first product stream comprising cyclohexane and a second intermediate stream comprising n-hexane, contacting the second intermediate stream, in the presence of hydrogen and optionally a chloride, with a second isomerization catalyst composition in a second isomerization reactor defining a second reaction zone operated at a second reaction temperature greater than the first reaction temperature, and withdrawing from the second reaction zone a second product stream comprising isoh
    Type: Grant
    Filed: May 4, 2000
    Date of Patent: January 7, 2003
    Assignee: Phillips Petroleum Company
    Inventors: Fan-nan Lin, Edgar Durand Davis
  • Patent number: 6133496
    Abstract: A process and/or system is provided for isomerizing a hydrocarbon feedstock comprising saturated C.sub.
    Type: Grant
    Filed: March 9, 1999
    Date of Patent: October 17, 2000
    Assignee: Phillips Petroleum Company
    Inventors: Fan-nan Lin, Edgar Durand Davis
  • Patent number: 5994607
    Abstract: The invention concerns a process for isomerising a feed containing essentially hydrocarbons, preferably paraffins containing principally 4 to 8, preferably princiapply to 6 and more principally 5 and/or 6 carbon atoms per molecule, comprising a fractionation zone and at least two isomersation reaction zones, said process comprising carrying out the following steps:(1) sending the feed to a fractionation zone;(2) drawing off at least a portion of the liquid circulating in said zone, via at least two draw-off levels; and(3) sending the major portion of the liquid drawn off in step (2) to at least two isomerisation zones, each isomerisation zone being associated with a draw-off level.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: November 30, 1999
    Assignee: Institut Francais du Petrole
    Inventors: Jean-Francois Joly, Pierre Boucot, Michel Thery, Olivler Clause, Jean-Charles Viltard
  • Patent number: 5831140
    Abstract: The invention concerns a process for isomerizing a feed containing essentially hydrocarbons, preferably paraffins containing principally 4 to 8, preferably principally 4 to 6 and more preferably principally 5 and/or 6 carbon atoms per molecule, comprising a fractionation zone and at least two isomerization reaction zones, said process comprising carrying out the following steps:(1) sending the feed to a fractionation zone;(2) drawing off at least a portion of the liquid circulating in said zone, via at least two draw-off levels;(3) sending the major portion of the liquid drawn off in step (2) to at least two isomerization zones, each isomerization zone being associated with a draw-off level;(4) sending the major portion of the effluents from step (3) to the fractionation zone, substantially adjacent to the draw-off levels;(5) recovering an effluent from the fractionation zone.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: November 3, 1998
    Assignee: Institut Francais du Petrole
    Inventors: Jean-Fran.cedilla.ois Joly, Pierre Boucot, Michel Thery, Olivier Clause, Jean-Charles Viltard
  • Patent number: 5770042
    Abstract: A process combination is disclosed to selectively upgrade naphtha to obtain an isoparaffin-rich product for blending into gasoline. A naphtha feedstock is subjected to ring cleavage to convert naphthenes to paraffins using a nonacidic catalyst followed by isomerization of paraffins to obtain an increased proportion of isoparaffins. Ring cleavage also may be effected on the product of isomerization and separation by fractionation or adsorption.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: June 23, 1998
    Assignee: UOP
    Inventors: Leonid B. Galperin, Jeffery C. Bricker, Jennifer S. Holmgren
  • Patent number: 5763730
    Abstract: A process for the continuous isomerization of an alkane to produce an isomerized product through contacting the alkane with a simulated moving bed acting as a catalyst for isomerization and an adsorbent for the alkanes has been developed. The alkane may be n-butane and the isomerized product 2-methylpropane, the alkane may be n-pentane and the isomerized product 2-methylbutane or 2,2-dimethylpropane, the alkane may have from 6 up to about 8 carbon atoms with no more than one methyl branch and the isomerized product having the same number of carbon atoms and at least two methyl branches, or the reactant may be a mixture of the foregoing alkanes with the corresponding isomerized products being formed. In a zone of the simulated moving bed, the alkanes are catalytically isomerized to form the isomerized products. The unreacted alkanes are adsorbed, and the isomerized products are collected.
    Type: Grant
    Filed: June 18, 1996
    Date of Patent: June 9, 1998
    Assignee: UOP
    Inventors: Hemant W. Dandekar, Gregory A. Funk, Ralph D. Gillespie, Herman A. Zinnen, Charles P. McGonegal, Masami Kojima, Simon H. Hobbs
  • Patent number: 5744683
    Abstract: A process for the continuous isomerization of an alkane to produce an isomerized product through contacting the alkane with a simulated moving bed acting as a catalyst for isomerization and an adsorbent for the alkanes has been developed. The alkane may be n-butane and the isomerized product 2-methylpropane, the alkane may be n-pentane and the isomerized product 2-methylbutane or 2,2-dimethylpropane, the alkane may have from 6 up to about 8 carbon atoms with no more than one methyl branch and the isomerized product having the same number of carbon atoms and at least two methyl branches, or the reactant may be a mixture of the foregoing alkanes with the corresponding isomerized products being formed. In a zone of the simulated moving bed, the alkanes are catalytically isomerized to form the isomerized products. The unreacted alkanes are adsorbed, and the isomerized products are collected.
    Type: Grant
    Filed: June 18, 1996
    Date of Patent: April 28, 1998
    Assignee: UOP
    Inventors: Hemant W. Dandekar, Gregory A. Funk, Simon H. Hobbs, Masami Kojima, Ralph D. Gillespie, Herman A. Zinnen, Charles P. McGonegal
  • Patent number: 5744684
    Abstract: A process for isomerizing a mixture of alkanes containing pentanes and at least one alkane having from 6 to about 8 carbon atoms and no more than one methyl branch has been developed.
    Type: Grant
    Filed: June 18, 1996
    Date of Patent: April 28, 1998
    Assignee: UOP
    Inventors: Herman A. Zinnen, Charles P. McGonegal, Hemant W. Dandekar, Gregory A. Funk, Ralph D. Gillespie
  • Patent number: 5530172
    Abstract: A process for the continuous isomerization of an alkane to produce an isomerized product through contacting the alkane with a simulated moving bed acting as a catalyst for isomerization and an adsorbent for the alkanes has been developed. The alkane may be n-butane and the isomerized product 2-methylpropane, the alkane may be n-pentane and the isomerized product 2-methylbutane or 2,2-dimethylpropane, the alkane may have from 6 up to about 8 carbon atoms with no more than one methyl branch and the isomerized product having the same number of carbon atoms and at least two methyl branches, or the reactant may be a mixture of the foregoing alkanes with the corresponding isomerized products being formed. In a zone of the simulated moving bed, the alkanes are catalytically isomerized to form the isomerized products. The unreacted alkanes are adsorbed, and the isomerized products are collected.
    Type: Grant
    Filed: November 3, 1994
    Date of Patent: June 25, 1996
    Assignee: UOP
    Inventors: Gregory A. Funk, Hermant W. Dandekar, Masami Kojima, Simon H. Hobbs
  • Patent number: 5530173
    Abstract: A process for isomerizing a mixture of alkanes containing pentanes and at least one alkane having from 6 to about 8 carbon atoms and no more than one methyl branch has been developed.
    Type: Grant
    Filed: November 3, 1994
    Date of Patent: June 25, 1996
    Inventors: Gregory A. Funk, Hemant W. Dandekar
  • Patent number: 5326925
    Abstract: An isomerization process maximizes the production of 2,3-dimethylbutane by using an arrangement of two reaction zones that operate at low conversion conditions to maximize the production of a methyl pentane containing intermediate and limit the interconversion of 2,3-dimethylbutane to 2,2-dimethylbutane. The process converts a feed comprising normal hexane in a first reaction zone. The effluent from the first reaction zone has a high concentration of methyl pentanes which is separated from normal hexane and passed to a second separation section that receives the effluent from a second reaction zone. Methyl pentanes from the first and second reaction zone effluents enter the second reaction zone for conversion to dimethylbutane in a high 2,3-dimethylbutane to 2,2-dimethylbutane ratio. In this manner the process produces a principally dimethylbutane product having a relatively high octane rating as a result of the high 2,3-dimethylbutane concentration.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: July 5, 1994
    Assignee: UOP
    Inventor: J. W. Adriaan Sachtler
  • Patent number: 5227554
    Abstract: A process for the isomerization of C.sub.4 and higher molecular weight hydrocarbons, preferably C.sub.4 to C.sub.6 paraffins with high C.sub.6 cyclics content. A C.sub.5 to C.sub.6 hydrocarbon stream is isomerized in a first isomerization reaction zone and a C.sub.4 hydrocarbon stream is isomerized in a second isomerization reaction zone. At least one or both of the effluent streams from the first and second isomerization zones are conveyed to a gas-liquid separator which separates a hydrogen-rich recycle stream. At least a portion of the hydrogen-rich recycle stream is conveyed to the C.sub.5 to C.sub.6 hydrocarbon feed stream and at least a portion of the hydrogen-rich recycle stream is conveyed to the C.sub.4 hydrocarbon feed stream whereby the hydrogen recycle stream is shared during both the C.sub.4 isomerization reaction and the C.sub.5 to C.sub.6 isomerization reaction. The product stream is conveyed to a shared stabilizer which removes the gaseous and volatile components.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: July 13, 1993
    Assignee: Mobil Oil Corporation
    Inventor: Tai-Sheng Chou
  • Patent number: 5139645
    Abstract: Process for producing gasoline components from a hydrocarbonaceous feed containing hydrocarbons comprising at least 4 carbon atoms, and hydrocarbons obtained thereby. The process comprises:a. separating feed into a heavy fraction containing hydrocarbons comprising at least 7 carbon atoms and a light fraction containing hydrocarbons comprising at most 7 carbon atoms,b. isomerizing at least part of the light fraction at a temperature between 50.degree. and 300.degree. C.,c. separating effluent of step b) into a stream containing branched hydrocarbons and a stream containing normal hydrocarbons, andd. isomerizing at least part of the stream containing normal hydrocarbons at a temperature which is higher than the temperature applied in step b).
    Type: Grant
    Filed: May 13, 1991
    Date of Patent: August 18, 1992
    Assignee: Shell Oil Company
    Inventors: Ian E. Maxwell, Gerrit J. D. Otter, Gregory V. Tonks
  • Patent number: 4919786
    Abstract: A process for selectively producing middle distillate fuel products from paraffin waxes such as slack wax and Fischer-Tropsch wax by hydroisomerizing the wax to convert 60-95 weight percent per pass of the 700.degree. F..sup.+ fraction contained in said wax. The catalyst employed is a fluorided Group VIII metal-on-alumina catalyst where the fluoride within the catalyst is present predominately as aluminum fluoride hydroxide hydrate. The preferred Group VIII metal is platinum.
    Type: Grant
    Filed: December 13, 1988
    Date of Patent: April 24, 1990
    Assignee: Exxon Research and Engineering Company
    Inventors: Glen P. Hamner, deceased, Willard H. Sawyer, Heather A. Boucher
  • Patent number: 4832819
    Abstract: A process for producing a pumpable syncrude from a Fischer-Tropsch wax by fractionating the wax into relatively low boiling fraction containing oxygenate compounds and a relatively high boiling fraction which is substantially free of oxygenate compounds and thereafter isomerizing/hydrocracking the low boiling fraction in the presence of hydrogen and a fluorided Group VIII metal-on-alumina catalyst. The preferred Group VIII metal is platinum.The pumpable syncrude is thereafter fractionated to produce a low boiling fraction which is thereafter isomerized/hydrocracked in the presence of hydrogen and a fluorided Group VIII metal-on-alumina catalyst to produce upgraded middle distillate fuel products. The preferred catalyst for middle distillate production is a fluorided platinum-on-alumina catalyst where a major portion of the fluoride within the catalyst is present as aluminum fluoride hydroxide hydrate.
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: May 23, 1989
    Assignee: Exxon Research and Engineering Company
    Inventor: Glen P. Hamner
  • Patent number: 4554065
    Abstract: A process for dewaxing a hydrocarbon feedstock with a relatively high pour point and containing normal and slightly branched paraffins by subjecting said feed to catalytic dewaxing over a noble metal promoted zeolite beta catalyst followed by dewaxing with a base metal promoted zeolite beta catalyst. The feed may be hydrotreated before dewaxing.
    Type: Grant
    Filed: May 3, 1984
    Date of Patent: November 19, 1985
    Assignee: Mobil Oil Corporation
    Inventors: Kenneth R. Albinson, Jonathan E. Child
  • Patent number: 4311867
    Abstract: Unbranched or less branched paraffins having 6 carbon atoms as essential components are isomerized without side reaction in high yield in the presence of hydrogen fluoride and boron trifluoride as a catalyst while keeping percent isomerization of paraffins having 6 carbon atoms lower than the equilibrium percent isomerization of the paraffins having 6 carbon atoms at a given reaction temperature, or by conducting isomerization at a plurality of stages while keeping a reaction temperature at a given stage lower than that at the preceding stage and keeping percent isomerization of paraffins having 6 carbon atoms at a given stage lower than the equilibrium percent isomerization thereof at the reaction temperature at the stage.
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: January 19, 1982
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Makoto Takagawa, Tamotsu Ueno, Takehiko Takahashi