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| Number | Title | Issue Date |
| 7435865 | Method for separating hydrocarbons and use of a zeolite therefor 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... | 10/14/2008 |
| 7396973 | Simulated moving bed adsorptive separation process for handling multiple feedstocks The present invention discloses a means to improve the production capacity and feedstock handling flexibility of a simulated moving bed adsorptive separation process by introducing a second feed stream to the adsorbent chamber, such second feed stream comprising a f... | 07/08/2008 |
| 7390412 | Method of managing the valves of a simulated moving bed separation system A method of managing the valves of a simulated moving bed separation system comprising at least one column of adsorbent beds split into several zones delimited by injection and draw-off points, allowing finer monitoring of a determined concentration profile. The met... | 06/24/2008 |
| 7304124 | Process for stripping volatile substances from dispersion comprising polymer particles and process for producing toner A stripping process is provided which continuously strips volatile substances from a dispersion containing a polymer particles through stripping the volatile substances from a dispersion by blowing an inert gas into the dispersion to draw the volatile substances int... | 12/04/2007 |
| 7211703 | Method of separating E and Z isomers of an alkene alcohol and derivatives thereof E and Z isomers of alkene alcohols and/or alkene alcohol derivatives are separated by substantially continuously contacting an ion exchange medium which is ion exchanged with silver and/or copper ions with the feed stream comprising the E and Z isomers of at least o... | 05/01/2007 |
| 7148392 | Separation of 1-butene from Cfeed streams In a process for selectively separating 1-butene from a C4 feed stream comprising at least 1-butene, cis-2-butene and trans-2-butene, the feed stream is passed through a first bed of an adsorbent comprising a crystalline microporous material to form a sub... | 12/12/2006 |
| 6924406 | Process for separating mixtures of hydrocarbon isomers in gas phase on molecular sieves A process for separating mixtures of hydrocarbon isomers on molecular sieves, including providing columns which include molecular sieves and function alternatively as secondary adsorption, primary adsorption, and desorption devices, feeding the mixtures of hydrocarb... | 08/02/2005 |
| 6888039 | Purification process A process of reducing the sulfur content of gasoline product comprising at least three concurrent steps: a) passing input fluid comprising pollutant through at least one adsorber to produce a polluted adsorber and a purified fluid stream which leaves the adsorber, s... | 05/03/2005 |
| 6884918 | Agglomerated zeolitic adsorbents, method for obtaining same uses thereof The present invention relates to agglomerated zeolitic adsorbents based on zeolite X with an Si/Al ratio such that 1.15 | 04/26/2005 |
| 6870073 | Process for separating normal paraffins from hydrocarbons and applications for the separated hydrocarbons There is provided with a process for separating normal paraffins from hydrocarbons of C5-10 using zeolite molecular sieve 5A, which comprises the steps of (a) selective adsorption (b) cocurrent purge (c) countercurrent desorption. The present proce... | 03/22/2005 |
| 6843907 | Process for removal of carbonyl sulfide from hydrocarbons The invention comprises a process for removal of carbonyl sulfide from a hydrocarbon, which comprises contacting a hydrocarbon stream containing carbonyl sulfide with an adsorbent and then regenerating the adsorbent by passing a heated gas, containing a hydrolyzing ... | 01/18/2005 |
| 6841714 | Process for co-production of paraxylene, metaxylene and/or orthoxylene A process for co-production of paraxylene, metaxylene and/or orthoxylene from a hydrocarbon feedstock (1) that comprises [1] a separation stage of the feedstock in a simulated moving bed in a chromatographic column (9) that contains a number of beds of... | 01/11/2005 |
| 6838588 | Process for co-producing para-xylene and metaxylene, comprising two separation steps A process is described for co-producing metaxylene and paraxylene from a hydrocarbon feed comprising two separation steps. The first step of the process is a counter-current simulated moving bed system in a chromatographic column containing at least five zones, comp... | 01/04/2005 |
| 6828470 | Coproduction process for para-xylene and ortho-xylene comprising two separation steps A coproduction process for ortho-xylene and para-xylene starting with a batch of hydrocarbons comprises a simulated counter-current fluidized bed system in a chromatographic column (6) containing at least five zones, comprising injection (1) of the bat... | 12/07/2004 |
| 6784334 | Process for separating multibranched paraffins using a zeolitic adsorbent with a mixed structure A process for separating multibranched paraffins comprised in a hydrocarbon feed comprising hydrocarbons containing 5 to 8 carbon atoms per molecule comprises a separation unit functioning by adsorption and contains at least one zeolitic adsorbent with a mixed struc... | 08/31/2004 |
| 6706938 | Adsorptive separation process for recovery of para-xylene The performance of an adsorptive separation process recovering para-xylene from a C8 aromatic hydrocarbon feed mixture is improved by operating the process at higher desorbent purity. The improved performance allows for tradeoffs in other operating parame... | 03/16/2004 |
| 6696615 | Method of separating polycyclic aromatic hydrocarbons by means of chromatography The invention relates to an effective method of separating polycyclic aromatic hydrocarbons by means of a chromatographic separation method. This is achieved by using, according to the invention, calixarene-modified separation phases as stationary phase f... | 02/24/2004 |
| 6696616 | Process for co-production of metaxylene and paraxylene For co-production of metaxylene and paraxylene from a hydrocarbon feedstock in a simulated moving bed in a chromatographic column (1) that contains a number of beds 1, 2,3, 4 . . . of an adsorbent, interconnected in a loop, the column comprises an injecti... | 02/24/2004 |
| 6689929 | Process for the production of para-xylene using toluene feeds and pressure swing adsorption A pressure swing adsorption process to separate para-xylene and ethylbenzene from a C8 aromatics stream produced by toluene conversion uses a para-selective adsorbent, preferably a non-acidic, medium pore molecular sieve of the MFI structure ty... | 02/10/2004 |
| 6670519 | Monomethyl paraffin adsorptive separation process The amount of the adsorbent needed to recover a set quantity of monomethyl branched C10 -C15 paraffins from a mixture comprising normal paraffins and other nonnormal hydrocarbons such as di-isoparaffins, di-isoolefins, naphthenes and... | 12/30/2003 |
| 6627783 | Pressure swing adsorption process for separating para-xylene and ethylbenzene from mixed C8 aromatics A pressure swing adsorption process to separate para-xylene and ethylbenzene from C8 aromatics uses a para-selective adsorbent, preferably a non-acidic, medium pore molecular sieve of the MFI structure type, and is operated isothermally in the ... | 09/30/2003 |
| 6600083 | Para-xylene production process integrating pressure swing adsorption and crystallization A pressure swing adsorption process to separate para-xylene and ethylbenzene from C8 aromatics which uses a para-selective, non-acidic, medium pore molecular sieve of the MFI structure type and is operated isothermally in the vapor phase at ele... | 07/29/2003 |
| 6573418 | Process for production of para-xylene incorporating pressure swing adsorption and simulated moving bed adsorption A pressure swing adsorption process to separate para-xylene and ethylbenzene from C8 aromatics which uses a para-selective, non-acidic, medium pore molecular sieve of the MFI structure type and is operated isothermally in the vapor phase at ele... | 06/03/2003 |
| 6552242 | Fractionation in light paraffin isomerization process Fractional distillation performed to recover butane used as a desorbent component for adsorptive separation is integrated with the other fractionation of the raffinate stream of a C5 -C6 paraffin adsorptive separation zone. A single ... | 04/22/2003 |
| 6483002 | Integrated fractional distillation for adsorptive separation process Construction and operational costs of simulated moving bed adsorptive separation process units are reduced by recovering desorbent from both the extract and raffinate streams of the process in a single column. Both streams are fractionated to recover deso... | 11/19/2002 |
| 6410815 | Agglomerated zeolite adsorbents, process for their preparation, and their use for adsorbing paraxylene from aromatic C8 fractions The present invention relates to agglomerated zeolite adsorbents based on faujasite with an Si/Al ratio such that 1ࣘSi/Alࣘ1.15, at least 70% exchanged with barium and optionally with potassium, and on a binder, preferably a zeolitizable binder. They a... | 06/25/2002 |
| 6407305 | Adsorptive separation process for recovery of two paraffin products Two separate paraffinic hydrocarbon products, such as normal and monomethyl branched C10 -C23 paraffins, are recovered from a mixture comprising the product hydrocarbons and many other hydrocarbons in a process employing two adsorpti... | 06/18/2002 |
| 6407303 | Isomerization process with adsorptive separation and integrated fractional distillation Construction and operational costs of simulated moving bed adsorptive separation process units are reduced by recovering desorbent from both the extract and raffinate streams of the process in a single integrated fraction column. Both streams are fraction... | 06/18/2002 |
| 6407301 | Ethylene production by steam cracking of normal paraffins An adsorptive separation process for preparing the separate feed streams charged to naphtha reforming unit and a steam cracking unit is presented. The feed stream to the overall unit is fractionated to yield a C5 stream and a second stream cont... | 06/18/2002 |
| 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 |
| 6395950 | Isomerization with adsorptive separation and dividing wall fractional distillation Construction and operational costs of recovering the high-octane components of an isomerization raffinate product of a simulated moving bed adsorptive separation process units are reduced by employing a dividing wall column to perform the separation. The ... | 05/28/2002 |
| 6376734 | Process for the production of at least one isomer of xylenes that comprise an adsorption stage and an isomerization stage with an euo-structural-type catalyst A process for the production of at least one isomer of xylenes comprising a simulated moving-bed adsorption (8) of a C8-aromatic feedstock (1) that delivers a paraxylene-rich fraction (9) that is optionally purified after a distillation (16) by at least o... | 04/23/2002 |
| 6369287 | Process for co-production and separation of ethylbenzene and paraxylene A process for co-production of paraxylene and ethylbenzene comprises: (A) an adsorption stage of a feedstock of xylenes and ethylbenzene in a simulated moving bed that produces an extract of pure paraxylene and an ethylbenzene-rich raffinate; (B) an adsor... | 04/09/2002 |
| 6359186 | Process for co-production of metaxylene and paraxylene For co-production of metaxylene and paraxylene from a feedstock (line-4) of hydrocarbons, there is employed a simulated moving bed chromatographic column 5 having at least five zones and which delivers an extract, a raffinate and an intermediate raffinate... | 03/19/2002 |
| 6353144 | Process for chromatographic separation of a C5-C8 feed or an intermediate feed into three effluents, respectively rich in straight chain, mono-branched and multi-branched paraffins For producing three effluents which are respectively rich in straight chain paraffins, in mono-branched paraffins, and in di-branched and tri-branched paraffins possibly with naphthenic and/or aromatic compounds, from C5-C8 cuts or intermediate cuts (C5-C... | 03/05/2002 |
| 6348637 | Multifunction fractionation column for adsorptive separation processes Construction and operational costs of simulated moving bed adsorptive separation process units are reduced by recovering desorbent from both the extract and raffinate streams of the process in a single column. Both streams are fractionated in the same col... | 02/19/2002 |
| 6348636 | Purification of polymeric dispersions by stripping in the presence of adsorbent materials The present invention relates to methods for removing VOCs from an aqueous polymer dispersion (e.g., an SBR latex) in which the dispersion is contacted with a stripping medium in the presence of a particulate adsorbent such as activated carbon. This proce... | 02/19/2002 |
| 6288299 | Method for eliminating inhibitors of polymerization of monomer mixtures using an optimized alumina The invention relates to a process for adsorption of polymerization inhibitors from ethylenically unsaturated monomers, in which these inhibitors are placed in contact with an alumina exhibiting a volume of pores of diameter greater than 100 Å of at leas... | 09/11/2001 |
| 6261458 | System for alternately merging at least four fluids and its application in a separation process in a simulated moving bed A system that makes it possible to merge at least four fluids with a column for separating a feedstock, for example, in a simulated moving bed, comprises at least one trunnion-mounted ball valve, whereby this valve comprises at least one means that makes ... | 07/17/2001 |
| 6177604 | Process for co-production and separation of ethylbenzene and paraxylene Paraxylene and ethylbenzene are produced from an aromatic hydrocarbon feedstock by using adsorption zones in a simulated fluid bed. The feedstock is first passed into a first adsorption zone to produce a first paraxylene-rich fraction and a second ethylbe... | 01/23/2001 |
