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| Number | Title | Issue Date |
| 7431804 | Method for carrying out the distillation or reactive distillation of a mixture containing at least one toxic constituent A process is proposed for the distillation or reactive distillation of a mixture that includes at least one toxic component, the process being carried out in a column containing a structured packing, having at least one packing layer (1) having a lower end ( | 10/07/2008 |
| 7425247 | Method for producing an aqueous solution hydroxylamine This invention relates to a method for producing an aqueous solution of free hydroxylamine (HA) by simultaneous countercurrent treatment of a HA salt with ammonia or ammonia water, then separating the HA by distillation and reconcentrating the aqueous HA solution in... | 09/16/2008 |
| 7368583 | Process for recovery of plant sterols from by-product of vegetable oil refining The process for recovery of plant sterols and tocopherols from deodorization distillates formed during chemical or physical refining of vegetable oils consists of the following steps: free fatty acids are removed from the deodorization distillate by vacuum distillat... | 05/06/2008 |
| 7214846 | Recovery of ethylene and propylene from a methanol to olefin reaction system The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetyl... | 05/08/2007 |
| 7208650 | Recovery of ethylene and propylene from a methanol to olefin reaction system The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetyl... | 04/24/2007 |
| 7182840 | Method and device for exploiting heat resulting from the production of 1,2-dichloroethane The invention relates to a method and a device for the optimal use of reaction heat resulting from the production of 1,2-dichloroethane from ethene and chlorine. The aim of the invention is achieved by extracting reaction heat liberated during the reaction of chlori... | 02/27/2007 |
| 7179388 | Method for removing formic acid from aqueous solutions Formic acid is at least partly removed from an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol by decomposition over certain decomposition catalysts. The method is preferably used for processing reaction products from the oxidation of ... | 02/20/2007 |
| 7074971 | Recovery of ethylene and propylene from a methanol to olefin reaction system The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetyl... | 07/11/2006 |
| 7030277 | Process and apparatus for catalytic distillations A process for reacting a first component with itself or a second component to produce a third component in which a first material comprising a first component or said first component and a second component is fed to divided wall column having a catalytic distillatio... | 04/18/2006 |
| 7014833 | Process and apparatus for catalytic distillations A process for reacting a first component with itself or a second component to produce a third component in which a first material comprising a first component or said first component and a second component is fed to divided wall column having a catalytic distillatio... | 03/21/2006 |
| 6946068 | Process for desulfurization of cracked naphtha A process for concurrently fractionating and hydrotreating of a full range naphtha stream. The full boiling range naphtha stream, for example which is derived from fluid catalytic cracking, is first subjected to simultaneous hydrogenation of the thiophene contained ... | 09/20/2005 |
| 6930206 | Process and apparatus for catalytic distillations A process for reacting a first component with itself or a second component to produce a third component in which a first material comprising a first component or said first component and a second component is fed to divided wall column having a catalytic distillatio... | 08/16/2005 |
| 6767517 | Method and apparatus for the continuous production of diaryl carbonates An energy efficient series of mass and energy integrated reactive distillation columns and distillation columns are used to effect the production of diaryl carbonate. Utilizing the method or apparatus of the invention facilitates high diaryl carbonate production rat... | 07/27/2004 |
| 6583326 | Process for separating phenol from a mixture comprising at least hydroxyacetone, cumene, water and phenol Phenol is separated from a mixture containing hydroxyacetone, cumene, water and phenol, by fractionating the mixture in a process with a fractional distillation step and a phase separation step to provide a single phenol fraction containing less than 300 ... | 06/24/2003 |
| 6583325 | Process for the production of tertiary alkyl ethers A process for the production of tertiary ethers from the reaction of isoolefins with lower alcohols, such as methanol, uses two distillation column reactors in series to maximize conversion, especially for isopentenes and isohexenes. The second distillati... | 06/24/2003 |
| 6416659 | Process for the production of an ultra low sulfur A process for the hydrodesulfurization of a diesel boiling range petroleum fraction wherein the hydrodesulfurization is carried out concurrently with a fractional distillation in a distillation column reactor containing a catalyst bed. The diesel is fed a... | 07/09/2002 |
| 6338793 | Process for the desulfurization of a diesel fraction A process for the hydrodesulfurization of a diesel boiling range petroleum fraction wherein the hydrodesulfurization is carried out concurrently with a fractional distillation in a distillation column reactor containing a catalyst bed. The diesel is fed a... | 01/15/2002 |
| 6299734 | Preparation of an aqueous solution of free hydroxylamine An aqueous solution of free hydroxylamine is prepared by treating a hydroxylammonium salt with ammonia by the countercurrent method in a stripping column by a process in which hydroxylamine is liberated and at the same time the solution obtained is separa... | 10/09/2001 |
| 6137023 | Process for the production of high purity isobutene combining reactive distillation with hydroisomerisation and skeletal isomerisation The invention relates to a process for producing high purity isobutene from a hydrocarbon cut essentially comprising olefinic hydrocarbons containing 4 carbon atoms per molecule including isobutene, also butene-1 and butene-2 compounds in a ratio which su... | 10/24/2000 |
| 6037489 | Method of purifying glyoxylic esters and distillation equipment for purifying glyoxylic esters A method for purifying glyoxylates includes (1) a coarse distillation process in which a crude glyoxylate in which water coexists is, in a film form, continuously subjected to coarse distillation, and (2) an azeotropic dehydration process in which the cru... | 03/14/2000 |
| 5948948 | Paraffin isomerisation process using reactive distillation The invention concerns a process for isomerising a feed containing essentially hydrocarbons, preferably paraffins preferably containing 5 and/or 6 carbon atoms per molecule, in which said feed is treated in a distillation zone comprising an exhausting zon... | 09/07/1999 |
| 5847249 | Apparatus and process for catalytic distillations A process for selectively treating the components in a multi-component stream in a distillation column reactor. Additional catalytic distillation structures are placed as a secondary bed in the distillation column, either above or below the primary bed, a... | 12/08/1998 |
| 5817906 | Process for producing light olefins using reaction with distillation as an intermediate step The present invention relates to a process for the production of light olefins comprising olefins having from 2 to 4 carbon atoms per molecule from a crude oxygenate feedstock. The crude oxygenate feedstock comprises an alcohol, and water. The process com... | 10/06/1998 |
| 5779883 | Hydrodesulfurization process utilizing a distillation column realtor A process for the hydrodesulfurization of petroleum streams is disclosed wherein the sulfur containing petroleum stream is contacted along with hydrogen at a partial pressure of less than 70 psig in a distillation column reactor containing a hydrodesulfur... | 07/14/1998 |
| 5763714 | Process and apparatus for the production and recovery of p-xylene A mixed aromatic stream is hydrotreated to remove olefins and fractionated to separate C9 + heavies in a distillation column reactor and the C8 and lighter material is fed to a selective adsorption unit where the para-xylene is remov... | 06/09/1998 |
| 5714646 | Process for producing isopropyl alcohol A process for producing isopropyl alcohol by hydrating directly propylene and water in the presence of a strong acid solid catalyst which includes feeding continuously propylene, water which is the same as or more than propylene in terms of mole, and a sa... | 02/03/1998 |
| 5660691 | Process for the production of tocotrienol/tocopherol blend concentrates Disclosed is an improved process for the preparation of tocotrienol/tocopherol blend concentrates from vegetable oil distillates which are enriched in tocotrienols. Tocotrienol/tocopherol blend concentrates are obtained containing 20-80% tocotrienols/toco... | 08/26/1997 |
| 5512691 | Process for the production of tocopherol concentrates Disclosed is an improved process for the preparation of tocopherol concentrates from vegetable oil distillates. Tocopherol concentrates are obtained containing 20-80% tocopherol by weight, with an overall recovery of tocopherol of 72% to 97%. The process ... | 04/30/1996 |
| 5507919 | Apparatus for the thermal and catalytic defluorination of alkylate An apparatus and method are provided for the defluorination of a liquid hydrocarbon mixture, containing organic fluorides, produced during the conversion of hydrocarbons using a fluorine-containing catalyst. In one embodiment, both a thermal means and a c... | 04/16/1996 |
| 5502249 | Process for the removal of iodine from acetyl compounds Disclosed is a process for the removal of iodine, including I2, I- and iodine-containing organic compounds, from acetic acid or anhydride wherein an acetyl product stream comprising (i) acetic acid or acetic anhydride and (ii) iodine... | 03/26/1996 |
| 5336841 | Oxygenate removal in MTBE process A process is provided to remove oxygenates from a C4 raffinate stream from an MTBE plant. A back-cracking catalyst is placed into the bottom of an oxygenate removal column which will convert any MTBE or TBA contained therein back to their origi... | 08/09/1994 |
| 5294305 | Ethylene glycol recovery process The present invention is an improved process for the recovery of ethylene glycol from spent glycol generated in the manufacture of polyethylene terephthalate. The spent glycol typically consists of metal oxide catalyst residues, low molecular weight terep... | 03/15/1994 |
| 5284969 | Process for the production of polyisocyanates A process for the continuous catalyst-free production of polyisocyanates by thermal decomposition of the N-substituted carbamic acid esters corresponding to the polyisocyanates, in which the carbamic acid esters to be decomposed, in the form of a 5 to 90%... | 02/08/1994 |
| 5246722 | Preparation of concentrates of coloring agents Concentrates of natural coloring agents such as carotene are prepared from organic media, particularly from palm oil, by a process in which the oil, together with a volatile solvent, is subjected to gel permeation chromatography. The concentrated coloring... | 09/21/1993 |
| 5183538 | Extraction plus ion exchange processing of a brine stream A method for recovering a liquid diluent having a low salt content from an organic/aqueous mixture which contains significant quantities of the diluent, an alkali metal salt, and water comprises an integrated process which joins extraction and ion exchang... | 02/02/1993 |
| 5122235 | Process for the removal of chloroprene from, 1,2-dichloroethane Disclosed herein is a process for removing chloroprene by subjecting chloroprene-containing 1,2-dichloroethane to heat treatment at a temperature in the range of from the boiling point (85° C.) of 1,2-dichloroethane to the thermal cracking temperature (3... | 06/16/1992 |
| 5108551 | Reclamation of alkanolamine solutions The present invention provides a method for purifying alkanolamine solutions which have lost at least a portion of their acid gas sorption capacity due to degradation of the alkanolamine into heat stable salts. Particularly, it has been found that the alk... | 04/28/1992 |
| 4973698 | Preparation of 2,3-difluoro-5-(trifluoromethyl)pyridine 2,3-Difluoro-5-(trifluoromethyl)pyridine is prepared by contacting a 2,3-dihalo-5-(trifluoromethyl) pyridine with an effective amount of KF or CsF in a polar aprotic solvent (diluent) at an elevated temperature under substantially anhydrous conditions wit... | 11/27/1990 |
| 4944847 | Method for inhibiting epichlorohydrin fouling A method of inhibiting fouling in distillation towers, overhead lines, reflux lines, and condensers operating in a process to manufacture and purify epichlorohydrin. This method resides in treating process streams entering or exiting such towers, lines an... | 07/31/1990 |
| 4867849 | Purification of alkyl glyoxylate There is disclosed an improved process for the manufacture of glyoxylic acid obtained by oxidation of glycolic acid. For processing purposes alkyl esters of these acids are employed. Increased efficiency is obtained by recovering glycolate rich streams fr... | 09/19/1989 |
