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| Number | Title | Issue Date |
| 7812206 | Apparatus and process for the separation of solids and liquids A filter column apparatus comprising a filtration zone and a reslurry zone. These zones are separated by a barrier wall or are in substantial cooperation with each other. Also disclosed is a process for separating at least a portion of at least one substantially sol... | 10/12/2010 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 5866740 | 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 is distilled to eliminate toluene and benzene in at least 2 distillation columns, and the xylenes are crystallized at least once at between +10° C. and -30° C. The... | 02/02/1999 |
| 5811629 | Crystallization process for purification of paraxylene Improved process and apparatus for purifying paraxylene from mixed C8-aromatic feedstocks are disclosed in which the use of at least two crystallization stages operated at different temperatures in combination with a final product separator improves purit... | 09/22/1998 |
| 5629467 | Process and apparatus 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... | 05/13/1997 |
| 5329061 | Crystallization process for para-xylene recovery using two-stage recovery section In a combination crystallization/xylene isomerization process for producing para-xylene crystals, the recovery section is modified to accommodate crystallizing and separating para-xylene crystals at two different temperatures (a higher temperature followe... | 07/12/1994 |
| 5284992 | Process and apparatus for the separation of p-xylene in C8 aromatic hydrocarbons with a simulated moving bed absorption 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... | 02/08/1994 |
| 5055630 | Process for making p-xylene with a purity of more than 99.8% by weight The process for obtaining a p-xylene final product more than 98% pure from a crystalline starting material with a purity of about 98%, includes the steps of intermixing the starting material with precooled water and fed back recovered p-xylene in a mixer ... | 10/08/1991 |
| 5004860 | Filter system The filter system includes a plurality of porous metal filter tubes and is used in a method for extracting high purity solid para-xylene crystals from a mother liquor feed slurry of mixed xylenes in liquid and crystal form utilizing a separation unit whic... | 04/02/1991 |
| 4946560 | Process for separating alpha and internal olefins A feedstock containing alpha olefins and internal olefins is converted into a first product having an enhanced internal olefin content over that of the feedstock and into a second product having an enhanced alpha olefin content over that of the feedstock ... | 08/07/1990 |
| 4915794 | Process for converting internal olefins to alpha olefins This invention relates to a process for producing an olefin product having an enhanced alpha olefin content from an olefin feedstock containing internal olefins or a mixture of internal and alpha olefins which includes: (a) contacting the feedstock with a... | 04/10/1990 |
| 4914257 | Method and apparatus for recovering high purity toluene, hexane, titanium tetrachloride and tetrahydrofuran from mixtures The method for separating from a mother liquor containing at least two liquids, one of the two liquids including the steps of: (a) forming a precipitatable complex from one of the liquids and a complexing agent; (b) precipitating the precipitatable complex fro... | 04/03/1990 |
| 4654450 | Inhibiting polymerization of vinyl aromatic monomers Vinyl aromatic compounds are stabilized against undesired polymerization by adding to the vinyl aromatic compounds small amounts of a N,N-dialkylhydroxylamine and an alkyl benzene sulfonic acid.... | 03/31/1987 |
| 4524228 | Production of durene and gasoline from synthesis gas Synthesis gas is catalytically converted to a feedstock comprising durene and gasoline. Durene is recovered from the feedstock by cooling it to a point where crystallization occurs and separating the crystallized durene. The durene subsequently is washed ... | 06/18/1985 |
| 4524231 | Production of durene from alcohols and ethers Durene is recovered from a mixture rich in durene and containing hydrocarbons boiling in the gasoline range by cooling the mixture to a point where crystallization occurs and separating the crystallized durene. The durene subsequently is washed with a was... | 06/18/1985 |
| 4524227 | Coproduction of durene and gasoline from synthesis gas and alcohols and separation of durene-gasoline mixtures Durene is recovered from a mixture rich in durene and containing hydrocarbons boiling in the gasoline range by cooling the mixture to a point where crystallization occurs and separating the crystallized durene. The durene subsequently is washed with a was... | 06/18/1985 |
| 4025573 | Separation process Para-xylene is obtained from a eutectic mixture by chilling the mixture and separating the resulting crystals by crystal classification.... | 05/24/1977 |
| 3959978 | Separation process by fractional crystallization A crystallisable component, for example paraxylene, is separated from solution by chilling, separating crystals, washing them, chilling the mother liquor in the presence of wash liquid, separating further crystals and washing them. The invention enables c... | 06/01/1976 |
| 3939221 | Xylenes separation process A continuous process for the separation of a mixed xylene isomer feedstock into o - and p - isomer fractions by feeding the mixed xylene isomer feedstock to a fractional distillation column in which a fraction containing a major portion of the o-xylene in... | 02/17/1976 |
