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| Number | Title | Issue Date |
| 7713387 | Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification A process for removing trioxane from a use stream I of formaldehyde, trioxane and water, by a) providing a use stream I of formaldehyde as the main component and trioxane and water as the secondary components, b) mixing the use stream I wit... | 05/11/2010 |
| 7695595 | Process for the production of a purified hydrofluoroalkane, purified hydrofluoroalkane, use of the hydrofluoroalkane and method for the analysis of a hydrofluoroalkane Process for the production of a hydrofluoroalkane, according to which hydrofluoroalkane comprising organic impurities is subjected to at least two distillations. ... | 04/13/2010 |
| 7481908 | System and a process for obtaining high purity phenanthrene from phenanthrene enriched coal tar fraction The present invention relates to a system and a process for obtaining phenanthrene of about 95% purity from coal tar distilled fraction containing crude phenanthrene by performing fractional distillation at a reduced pressure of 50 mm mercury and at a temperature ra... | 01/27/2009 |
| 7339088 | Alkylbenzene refining process and apparatus Improved processes and apparatus use a finishing column with a mid-cut that provides alkylbenzene products of high purity containing less than about 1 ppmw benzene and less than about 50 ppmw heavies while accommodating enhancements in the efficiencies and the capac... | 03/04/2008 |
| 7311813 | Distillation sequence for the purification and recovery of hydrocarbons This invention is an improved distillation sequence for the separation and purification of ethylene from a cracked gas. A hydrocarbon feed enters a C2 distributor column. The top of the C2 distributor column is thermally coupled to an ethylene distributor column, an... | 12/25/2007 |
| 7241928 | Process for the manufacture of halocarbons and selected compounds and azeotropes with HF A liquid phase process is disclosed for producing halogenated alkane adducts of the formula CAR1R2CBR3R4 (where A, B, R1, R2, R3, and R4 are as defined in the specification) whic... | 07/10/2007 |
| 7238260 | Purification of N-(2-hydroxyethyl)-2-pyrrolidone N-(2-hydroxyethyl)-2-pyrrolidone (HEP) is purified by a distillation sequence in which the purified HEP is recovered as a side stream without being separated as an overhead at any point in the procedure. ... | 07/03/2007 |
| 7145049 | Oligomerization process Alkenes, such as normal butenes in a mixed C4 stream are oligomerized, preferably to dimers, which are dimerized in a distillation column reactor over ZSM-57 zeolite catalyst at high conversions and high selectivity to octenes. Prior to oligomerization th... | 12/05/2006 |
| 7128814 | Process for separating 2-butanol from tert-butanol/water mixtures The present invention relates to a process for separating 2-butanol from tert-butanol/water by adding of tert-butanol such that the water concentration lowers to less than the limit concentration of the distillation boundary line connecting the two azeotropes TBA/wa... | 10/31/2006 |
| 7128813 | Process for manufacturing high purity methacrylic acid A process for the high yield production of high purity glacial methacrylic acid (“HPMAA”) with minimization of decomposition of hydroxy isobutyric acid (HIBA). The HPMAA is substantially pure, specifically 99% pure or greater with a water content of 0.05% or les... | 10/31/2006 |
| 7089762 | Multi-stage vacuum distilling, cooling and freezing processes and apparatuses for solution separation and seawater desalination Multi-stage vacuum distilling, cooling, and freezing processes for solution separation and seawater desalination are implemented through multi-stage vacuum distilling, cooling, and freezing systems. The systems are set to their initial state for implementing constan... | 08/15/2006 |
| 7074434 | Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, processes for the preparation of a hydrofluoroalkane and azeotropic compositions Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, according to which a hydrofluoroalkane/hydrogen fluoride mixture is reacted with at least one chlorinated or chlorofluorinated precursor of the hydrofluoroalkane... | 07/11/2006 |
| 7048833 | Method and apparatus for treating oxygenate-containing feeds and their use in conversion of oxygenates to olefins A feed vaporization process and apparatus for oxygenate to olefin conversion is provided which uses a vapor-liquid disengaging drum to separate non-volatiles and/or partial non-volatiles from volatiles in the oxygenate feed and produce a vaporized effluent that is r... | 05/23/2006 |
| 7037412 | Method for preparing deodorized N-vinyl-2-pyrrolidone The invention provides a method for producing purified N-vinyl-2-pyrrolidone free of odorous components. The method is composed of distilling with a distillation column a liquid, which is formed by adding to an odorous components-containing liquid having a N-vinyl-2... | 05/02/2006 |
| 6998504 | Method for the catalytic gas phase oxidation of propene into acrylic acid A process for the catalytic gas-phase oxidation of propene to acrylic acid, in which the reaction gas starting mixture is oxidized, with a high propene loading, in a first reaction stage, over a first fixed-bed catalyst which is housed in two successive reaction zon... | 02/14/2006 |
| 6972075 | Method for removing 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine The invention relates to a method for removing, by distillation, 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, by a) removing the hexamethylenediamine from the mixture while obtaining a mixture (I) that ... | 12/06/2005 |
| 6887352 | Distillative method for separating hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine A method for recovering hexamethylene diamine (HMD) from a mixture comprising HMD, 6-aminocapronitrile (ACN) tetrahydroazepine (THA), and adiponitrile (ADN) is disclosed. The method includes introducing the mixture into a first distillation column, separating... | 05/03/2005 |
| 6863780 | Process of separating/purifying pentafluoropropane There is provided an azeotropic mixture having 1,1,1,3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture of R-245fa and HF wherein the mixture of 1,1,1,3,3-pentafluoropropane and... | 03/08/2005 |
| 6849163 | Method for producing tetrafluoroethylene There is provided a process for recovering tetrafluoroethylene wherein an amount of energy required to obtain TFE is reduced. In the process for producing a TFE mixture as an intended mixture which contains TFE at a higher concentration from a raw material mi... | 02/01/2005 |
| 6838104 | Process for the production of tocotrienols This invention relates to processes for the production of tocotrienol compounds from biological sources such as palm oil, cereals, grains, and grain oils. The tocotrienol products are recovered in high yields. These tocotrienols are useful as pharmaceuticals, in foo... | 01/04/2005 |
| 6794470 | Process for producing a tetrafluoroethylene polymer A tetrafluoroethylene polymer is produced by polymerizing tetrafluoroethylene in the presence of an aqueous medium and a polymerization initiator, wherein the content of impurities (e.g. a saturated compound such as CH2F2 or CHF3 and... | 09/21/2004 |
| 6726811 | Method of purifying N-(2-hydroxyethy)-2-pyrrolidone A method for obtaining high purity N-(2-hydroxyethyl)-2-pyrrolidone satisfactory for use as an intermediate material for N-vinyl-2-pyrrolidone from a reaction liquid formed of a reaction between y-butyrolactone and 2-aminoethanol, i.e., a liquid containing N-(2-hydr... | 04/27/2004 |
| 6706898 | Methods for separating a tocopherol from a tocopherol-containing mixture The invention relates to method for separating tocopherol from a first tocopherol admixture by heating the first tocopherol admixture composed of at least one tocopherol, a fatty acid, and an esterifying compound to esterify the fatty acid to produce a second tocoph... | 03/16/2004 |
| 6627047 | Method for preventing polymerization in thin-film type evaporating device A method is provided for preventing an easily polymerizable substance from being polymerized in a thin-film type evaporating device by supplying a solution of the substance to the evaporating heating surface of the device by the centrifugal force of a sti... | 09/30/2003 |
| 6627046 | Separation of the products of polyamide ammonolysis The useful reaction products in an output stream from an ammonolysis reactor are separated in a manner which minimizes the time during which high boiling polyamide intermediate material(s) are in contact with the amine-functional monomer product(s) or wit... | 09/30/2003 |
| 6599398 | Recovery of adiponitrile from a mixture of adiponitrile, aminocapronitrile and hexamethylenediamine Process for the recovery of a purified adiponitrile (ADN) from a mixture of adiponitrile, aminocapronitrile and hexamethylenediamine, utilizing two sequential distillations: (1) a first distillation in which the mixture is distilled in a distillation colu... | 07/29/2003 |
| 6508917 | Method and apparatus for purifying low grade acetonitrile and other constituents from hazardous waste A method and apparatus for purifying acetonitrile from low grade acetonitriles. Low grade acetonitrile from DNA synthesis, HPLC and pharmaceutical drug manufacturing process wastes which comprise acetonitrile, a first set of impurities having a lower boil... | 01/21/2003 |
| 6500311 | Propylene oxide purification A mixture of propylene oxide and methanol is separated by liquid/liquid extraction using water and a hydrocarbon such as n-octane as extractive solvents.... | 12/31/2002 |
| 6488818 | Removal of impurities from 3-(2'-acetoxyethyl)-dihydro-2(3H)furanone A process for removing impurities from 3-(2'-acetoxyethyl)dihydro-2(3H)furanone (I), where the 3-(2'-acetoxyethyl)dihydro-2(3H)furanone containing the undesirable impurities is initially prepared in a manner known per se by acetylation of 3-(2'-hydro... | 12/03/2002 |
| 6488817 | Purification of hydrofluorocarbons A process for the purification of difluoromethane comprising: (a) subjecting a mixture comprising at least difluoromethane (HFC-32) and dichlorodifluoromethane (CFC-12) to a first distillation step in which a majority of either CFC-12 or HFC-32 is concentrated... | 12/03/2002 |
| 6419797 | Method for producing metal-free Guerbet alcohols There is provided a process for producing Guerbet alcohols not containing any heavy metals or soaps, wherein primary and/or secondary alcohols having 2 to 30 carbon atoms are condensed at elevated temperature in the presence of alkaline catalysts and/or h... | 07/16/2002 |
| 6395142 | Method and apparatus for purifying low grade acetonitrile and other constituents from hazardous waste A method and apparatus for purifying acetonitrile from low grade acetonitriles. Low grade acetonitrile from DNA synthesis, HPLC and pharmaceutical drug manufacturing process wastes which comprise acetonitrile, a first set of impurities having a lower boil... | 05/28/2002 |
| 6387223 | Alkylene carbonate process This invention concerns a process to provide high purity akylene carbonate though use of multiple distillations wherein the unused fractions are recycled to the reactor.... | 05/14/2002 |
| 6235162 | Ultrapure hydroxylamine compound solutions and process of making same In one embodiment, the present invention relates to a method of treating a solution containing hydroxylamine, involving subjecting the solution containing hydroxylamine to fractional distillation using a packed column thereby providing a first distillate;... | 05/22/2001 |
| 6224717 | Methods for separating a tocotrienol from a tocol-containing mixture and compositions thereof The invention relates to method for separating tocotrienol from a first tocol admixture by heating the first tocol admixture composed of a tocotrienol, at least one tocopherol, a fatty acid, and an esterifying compound to esterify the fatty acid to produc... | 05/01/2001 |
| 6201136 | Separation of liquid mixtures comprising formaldehyde, trioxane, alcohol and hemiformal In a process for separating liquid mixtures comprising formaldehyde, trioxane, alcohol, hemiformal formed from the formaldehyde and the alcohol, usual minor components and up to 5% by weight of water, the liquid mixture is distilled batchwise or continuou... | 03/13/2001 |
| 6159347 | Methods for separating a tocol from a tocol-containing mixture The invention relates to method for separating tocol from a tocol-containing admixture by heating the tocol-containing admixture composed a tocol, a fatty acid, and an esterifying compound to esterify the fatty acid to produce a second tocol admixture com... | 12/12/2000 |
| 6156160 | Alkylene carbonate process This invention concerns a process to provide high purity alkylene carbonate though use of multiple distillations wherein the unused fractions are recycled to the reactor.... | 12/05/2000 |
| 6120653 | Separation and purification method of t-butyl-methylphenol isomer A method is provided for industrially advantageously and effectively separating 4M2B and 3M6B from a t-butylcresol mixture containing 2-t-butyl-4-methylphenol (4M2B), 2-tbutyl-5-methylphenol (3M6B), compounds having a lower boiling point than that of 4M2B... | 09/19/2000 |
| 6106674 | Operable and efficient distillation schemes for multicomponent separations The present invention teaches an efficient and easier to operate distillation system to separate mixtures containing three or more components into streams enriched in one of the components. In this invention, a liquid stream enriched in the least volatile... | 08/22/2000 |
