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| Number | Title | Issue Date |
| 7989672 | Process and apparatus for para-xylene production A process of producing PX comprising providing a C8+ feedstock, the C8+ feedstock has C8 hydrocarbons and C9+ hydrocarbons, to a crystallization unit under crystallization conditions to produce a PX enriched stream having ... | 08/02/2011 |
| 7605296 | Method for separating and purifying 2,6-dimethylnaphthalene A method for separating and purifying 2,6-dimethylnaphthalene, is provided in which 2,6-dimethylnaphthalene of high purity is obtained from a mixture of dimethylnaphthalene isomers with a high yield, by means of a combined process of column melt crystallization and ... | 10/20/2009 |
| 7405340 | Process for recovering paraxylene utilizing ammonia absorption refrigeration A process for recovering paraxylene from a substantially hydrocarbon feedstock. The recovery comprises cooling the hydrocarbon feedstock in at least one refrigerated crystallization stage that is indirectly refrigerated by evaporating at least a portion of a substan... | 07/29/2008 |
| 7381855 | Process for producing adamantane An industrially advantageous process for producing adamantane by which high-purity adamantane reduced in coloration is efficiently produced while minimizing the loss. The process, which is for producing adamantane by isomerizing trimethylenenorbornane, includes (A) ... | 06/03/2008 |
| 7358414 | Para-xylene process using perm-selective separations Processes and apparatus are disclosed for recovery of purified products from a fluid mixture by means of integrated perm-selective separations with purified product recovery operations. More particularly, integrated processes of the invention comprise separations by... | 04/15/2008 |
| 7261810 | Method and system for transporting flows of fluid hydrocarbons containing wax, asphaltenes, and/or other precipitating solids A method and a system for transporting a flow of fluid hydrocarbons containing wax and/or asphaltenes or any other precipitating solids through a treatment and transportation system including a pipeline are disclosed. The flow of fluid hydrocarbons is introduced int... | 08/28/2007 |
| 7249469 | Method for separating a multicomponent stream This invention relates to a method for separating a stream having benzene, toluene and alkyl benzene, said method comprising: feeding the stream into a first distillation column, wherein the stream comprises between about 60 mole percent to about 85 mole percent tol... | 07/31/2007 |
| 7094937 | Compositions comprising cyclohexamantane Disclosed are compositions comprising C26H30 hexamantane, referred to herein as peri-condensed hexamantane, fully condensed hexamantane, and cyclohexamantane. These enriched cyclohexamantane compositions comprise at least 5 percent by weight cy... | 08/22/2006 |
| 6962061 | Apparatus for the liquefaction of natural gas and methods relating to same An apparatus and method for producing liquefied natural gas. A liquefaction plant may be coupled to a source of unpurified natural gas, such as a natural gas pipeline at a pressure letdown station. A portion of the gas is drawn off and split into a process stream an... | 11/08/2005 |
| 6935618 | Valve component with multiple surface layers A sliding component, particularly a disk valve plate. The sliding component includes a multi-layer surface structure comprising a strengthening layer harder than the substrate material, and an amorphous diamond top layer. ... | 08/30/2005 |
| 6894202 | Method for producing 2,6-dimethylnaphthalene An object of the present invention is to provide a method for manufacturing 2,6-DMN, in which even when a mixture containing DMN isomers which includes 5 wt % or more of 2,7-DMN is used, a highly pure 2,6-DMN can be obtained. The method for manufacturing the highly ... | 05/17/2005 |
| 6843851 | Compositions comprising pentamantanes and processes for their separation Disclosed are compositions comprising one or more pentamantanes. Specifically disclosed are compositions comprising 10 to 100 weight percent of one or more pentamantanes. Also disclosed are novel processes for the separation and isolation of pentamantane components ... | 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 |
| 6737558 | Process for the separation of 2,6-dimethylnaphthalene from mixtures containing it Process for the separation of 2,6-dimethylnaphthalene from mixtures containing it, comprising the following operations: crystallization by the addition of a solvent and cooling of the mixture to a temperature higher than the formation value of the first eutec... | 05/18/2004 |
| 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 |
| 6566410 | Methods of demulsifying emulsions using carbon dioxide A method of demulsifying a water-in-oil emulsion comprising an oil phase comprising asphaltenes and an aqueous phase is disclosed. The method comprises contacting a carbon dioxide containing fluid with the emulsion such that the carbon dioxide containing ... | 05/20/2003 |
| 6525235 | Method for manufacturing 2,6-dimethylnaphthalene The present invention provides a method for manufacturing a highly pure 2,6-dimethylnaphthalene having a purity of 99% or more even when a mixture of dimethylnaphthalene isomers containing 5 wt % or more of 2,7-dimethylnaphthalate is used as a feedstock. ... | 02/25/2003 |
| 6413480 | Method of separation of hydrocarbon oils from a waxy feedstock and separation system for implementation of said method Apparatus for separating wax from a feedstock mixture comprising solvent and a wax component is described. The apparatus includes a crystallization column and a plurality of compartments for forming the crystallized wax. Scraping means are employed to res... | 07/02/2002 |
| 6399846 | Process for production of paraxylene comprising a high-temperature crystallization with at least one stage and a partial melting of the crystals A process for production of paraxylene from a charge containing C7-C9 aromatic hydrocarbons in which a first fraction is enriched to at least 30% weight with paraxylene and this fraction is purified by at least one high-temperature crystallization in at l... | 06/04/2002 |
| 6383233 | Separation process A process is described for separating a desired substance from an aggregate mixture in which process a three-phase dispersion is formed, the first phase comprising droplets phase comprising a liquid transport phase, and the third phase comprising a surfac... | 05/07/2002 |
| 6376736 | Production of high purity meta-xylene A continuous process for integrated processing of a C8+ aromatic hydrocarbon stream is disclosed for recovery of a high purity meta-xylene product in conjunction with efficient separation and recovery of purified para-xylene and, optionally, pu... | 04/23/2002 |
| 6364914 | Method of crystallization with the particle size distribution being controlled Herein is disclosed a method of crystallization with the particle size distribution being controlled, characterized in that while crystals are being precipitated by vacuum concentration crystallization, the temperature of the slurry is periodically varied... | 04/02/2002 |
| 6291735 | Process for preparation of high-purity indene A process is provided for the preparation of high-purity indene. According to the process, impurities are eliminated by crystallization from an indene stock which is available in a concentrated form by distillation of a coal tar fraction and/or a petroleu... | 09/18/2001 |
| 6194609 | Crystallization in a plate heat exchanger Crystallization of a crystallizable material is achieved through heat exchange in a plate heat exchanger is disclosed. A mixture or solution comprising a crystallizable material is passed through a plate heat exchanger at an appropriate temperature and pr... | 02/27/2001 |
| 6147272 | Process for separating paraxylene comprising at least two crystallization stages at high temperature A process for producing paraxylene of very high purity from a charge containing a mixture of aromatic hydrocarbons having 7 to 9 carbon atoms in which at least a portion of the charge is made to circulate in a zone suited to enrich a first fraction of par... | 11/14/2000 |
| 6111161 | Process for production of paraxylene comprising a high-temperature crystallization with at least one stage and a partial melting of the crystals A process for production of paraxylene from a charge containing C7-C9 aromatic hydrocarbons in which a first fraction is enriched to at least 30% weight with paraxylene and this fraction is purified by at least one high-temperature crystallization in at l... | 08/29/2000 |
| 6074441 | Process for producing ultrafine-crystallization products The process for producing crystallisation products with an average particle diameter of | 06/13/2000 |
| 6072098 | Process for producing highly pure 2,6-dimethylnaphthalene There are disclosed an industrially advantageous process for efficiently producing highly pure 2,6-dimethylnaphthalene (DMN) in high yield from a mixture of DMN by carrying out in turn, the steps of isomerizing a mixture of DMN in the presence of a cataly... | 06/06/2000 |
| 6063978 | Process for separating paraxylene comprising at least one crystallization stage at high temperature and at least one clay treatment upstream from the adsorption zone A process for separating paraxylene at very high purity from a charge of xylene isomers, comprising a selective adsorption of a fraction that is rich in paraxylene, at least one high-temperature crystallization of this fraction, and an isomerization of th... | 05/16/2000 |
| 6060634 | Production of para-xylene from an effluent from paraselective toluene disproportionation using a crystallization process combined with simulated moving bed adsorption Para-xylene is produced from a paraselective toluene disproportionation reactor, effluent (3) is distilled to eliminate toluene and benzene in at least 2 distillation columns (C1), (C2), and the xylenes (8) are crystallized at least once (10) at between +... | 05/09/2000 |
| 6056791 | Process for the production of particles or powders In a novel process for the production of particles or powders, a substance or mixture of substances to be treated is provided in a pressure vessel. A highly compressible fluid is dissolved under pressure in the substance or mixture of substances provided ... | 05/02/2000 |
| 6057487 | Method for producing 2,6-DMN from mixed dimethylnaphthalenes by crystallization, adsorption and isomerization A method is disclosed to produce 2,6-dimethylnaphthalene (2,6-DMN), used for the production of polyethylene naphthalate, at high purity and high yield from a mixture of dimethylnaphthalene isomers without limitation to the specific isomers present in the ... | 05/02/2000 |
| 6004452 | Process for converting hydrocarbon feed to high purity benzene and high purity paraxylene A process is provided for producing high purity benzene and high purity paraxylene from a hydrocarbon feed. In one aspect, the process comprises: (a) reforming a hydrocarbon feed using either a monofunctional catalyst or a bifunctional catalyst to provide... | 12/21/1999 |
| 5977426 | Crystallization of 2,6-dimethylnaphthalene A method for recovering crystalline 2,6-dimethylnaphthalene comprising crystallizing in a scraped-wall crystallizer apparatus at crystallization temperature T, a mixture of low melting components, LM, having melting points of 70° F. and below, and high m... | 11/02/1999 |
| 5948949 | Process for producing 2,6-dimethylnaphthalene A process for producing highly pure 2,6-dimethylnaphthalene in a high yield from a mixture of dimethylnaphthalene isomers in the presence of a solvent, such as an aliphatic or alicyclic saturated hydrocarbon. Highly pure 2,6-dimethylnaphthalene can be pro... | 09/07/1999 |
| 5922924 | Process for the separation of p-xylene in C8 aromatic hydrocarbons with a simulated moving bed adsorption and a crystallization To continuously produce and separate high purity p-xylene from a C8 aromatic hydrocarbon charge, successive use is made in combination of (1) a stage of separating low-purity p-xylene (75 to 98%) by simulated moving bed adsorption chromatograph... | 07/13/1999 |
| 5871981 | Conversion of indene to (1S)-amino-(2R)-indanol free of any steroisomer by combination of fermentation of Rhodococcus sp. ATCC 55805 and chemical steps A method for preparing (1S)-amino-(2R)-indandiol substantially free of its stereoisomers is presented. The method comprises culturing indene with Rhodococcus sp. ATCC 55805, recovering the indandiol and subjecting the indandiol to chiral specific crystall... | 02/16/1999 |
| 5810892 | Method and apparatus for purifying chemical substances After being subjected to a melt crystallization operation, a crystal-containing melt is formed into particles of the same size and shape and then conducted in counter-flow relationship to washing liquid in a washing column. The crystal-containing melt can... | 09/22/1998 |
