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| Number | Title | Issue Date |
| 7670464 | Method for the distillative separation of a mixture containing vinyl ether and alchol Process for distillatively separating a mixture containing a vinyl ether of the general formula (I) R1—O—CH═CH2 (I) and alcohol of the general formula (II) R2—OH (II) in which... | 03/02/2010 |
| 7449088 | Process for obtaining fatty acids with improved odor, color and heat stability The present invention relates to a new process for obtaining fatty acids with improved color, odor and heat stability which is characterized in that: (a) in a first step the crude acids are fed to a rectification (“precut”) col... | 11/11/2008 |
| 7267803 | Degassing apparatus A degassing apparatus for use with a polymerisation reactor is disclosed. Slurry from the reactor is discharged into a flask tank (3) in which monomers or dilluent vaporise to form a gas. Filler units (9, 10) are provided at the upper part of the flash... | 09/11/2007 |
| 7268194 | Continuous slurry polymerization process and apparatus A process of converting a loop reactor into multiple loop reactors comprising starting with a loop reactor comprising at least 8 vertical legs, at least two non-vertical conversion runs, each non-vertical run connected in fluid flow communication with two vertical l... | 09/11/2007 |
| 7087685 | Process and system for removing heavies from diluent recycled to a slurry polymerization reactor A recycling and recovery system and process comprising a flash gas separator that receives a slurry comprising liquid medium and solid polymer particles. The flash gas separator separates the diluent from the solid polymer particles as a vapor stream comprising at l... | 08/08/2006 |
| 7052582 | Wave powered evaporation desalination system A wave powered evaporation desalination system for removing fresh water from salt water by extraction of water vapor from a negative pressure container using wave motion for power. The wave powered evaporation desalination system includes a first vessel that accepts... | 05/30/2006 |
| 7038002 | Production of mixtures of diisocyanates and polyisocyanates from the diphenylmethane series with high contents of 4,4′-methylenediphenyl diisocyanate and 2,4′-methylenediphenyl diisocyanate A fraction of diisocyanates of the diphenylmethane series containing at least 95 wt. % binuclear methylenediphenyl diisocyanate is obtained by a) reacting aniline and formaldehyde in the presence of an acid catalyst to produce diamines and polyamines of... | 05/02/2006 |
| 7005544 | Method for preventing polymerization in an acrylic acid manufacturing process A method for effectively preventing polymerization of acrylic acid during an azeotropic dehydration distillation in an acrylic acid manufacturing process and thus enabling stable operation of the azeotropic dehydration column over an extended period of time. The acr... | 02/28/2006 |
| 6982026 | Azeotropic distillation process for producing organic acids or organic acid amides Disclosed herein are methods for the recovery of at least one of an organic acid or an organic acid amide, such as a heat stable lactic acid or lactamide, from a feed stream which contains the organic acid and/or organic acid amide. The feed stream is mixed with at ... | 01/03/2006 |
| 6953553 | Process and apparatus for separating diluent from polymer solids Polymer solids are maintained in an intermediate pressure zone for a desired polymer solids residence time and then transferred to a purge zone or other lower pressure zone. An increase in the polymer solids residence time in the intermediate pressure zone allows mo... | 10/11/2005 |
| 6946055 | Method for recovering an organic solvent from a waste stream containing supercritical CO2 An organic solvent is separated from a waste stream containing supercritical CO2, an organic solvent and etchant contaminants. The process includes separating the supercritical CO2 by subjecting the waste stream to elevated temperature and/or r... | 09/20/2005 |
| 6926868 | Continuous slurry polymerization volatile removal A process/apparatus is disclosed for continuously separating a liquid medium comprising diluent and unreacted monomers from a polymerization effluent of a slurry loop reactor containing a flow of slurry therein, comprising a discharge conduit extending a distance in... | 08/09/2005 |
| 6905576 | Method and system for producing silane This invention relates to a continuous process for the preparation of silane by catalytic disproportionation of trichlorosilane in a reactive/distillative reaction zone having a catalyst bed of catalytically active solid. ... | 06/14/2005 |
| 6821382 | Method and arrangement for cleaning contaminated condensate including a combined stripper/condenser A method and apparatus for cleaning condensate, produced during the production of cellulose pulp, including evaporation of spent liquor, utilizing a cleaning plant having several condensers, coupled in series. Process steam from the last evaporation stage and unclea... | 11/23/2004 |
| 6821394 | Process of extracting from haw-pit by dry distillation and its device The present invention relates to a process of extracting haw pits by dry distillation and the device used therein. The process includes the following steps: removing the impurities of haw pits and drying them; immersing haw pits in water and then dripping and chargi... | 11/23/2004 |
| 6793777 | Method for separating and purifying an aqueous mixture that mainly consists of acetic acid and formic acid The invention relates to a method for separating and purifying an aqueous mixture that mainly consists of acetic acid, formic acid and high-boiling substances by extraction with a solvent in a cyclic process. The inventive method is characterized in that the flow of... | 09/21/2004 |
| 6780288 | Process for the manufacture of concentrated solutions Process for the manufacture of a concentrated solution, like a concentrated aqueous hydrogen peroxide solution, by distillation and evaporation of a dilute solution, in which the distillation and the evaporation are carried out in two distinct pieces of equipment wh... | 08/24/2004 |
| 6635150 | Method for distilling a fluid with horizontal vapor transfer into a condensation zone and modular device for implementing said method A method for distilling a fluid which is useful, for instance, in eliminating salt from brackish and/or sea water includes percolating films on plates with multiple effects having several evaporating zones and condensation zones. The evaporation zones (EV... | 10/21/2003 |
| 6605191 | Method for reprocessing reaction mixtures containing diaryl carbonate A process for the work up of a reaction mixture obtained from the preparation of diaryl carbonate by direct carbonylation of aromatic hydroxy compounds is disclosed. The process entails obtaining a reaction mixture that contains diaryl carbonate, aromatic... | 08/12/2003 |
| 6514388 | Method for producing highly pure monoethylene glycol A process for the distillative recovery of high purity monoethylene glycol from the hydrolysis product of ethylene oxide by pressure dewatering, vacuum dewatering and subsequent purifying distillation, which includes the pressure dewatering columns or at ... | 02/04/2003 |
| 6464839 | Beta-elemene, method to prepare the same and uses thereof This invention provides an anti-cancer composition of high purity beta-elemene extracted from plant sources. This invention also provides for the use of the composition as well as a low cost method to prepare it by multiple passes through the precision di... | 10/15/2002 |
| 6391162 | Desalination apparatus and method of operating the same A desalination apparatus and method utilizing solar energy provided with a solar heat collector for heating a heating medium with solar energy, a heat exchanger cooperating with an evaporation can so as to subject the heating medium and raw water in the e... | 05/21/2002 |
| 6334935 | Distillation of (meth) acryloxy-bearing alkoxysilane A (meth)acryloxy-bearing alkoxysilane is isolated and purified to a high purity by distilling a reaction solution containing the (meth)acryloxy-bearing alkoxysilane in a thin-layer distillation device at a temperature of 90-160° C. and a vacuum of 1-15 m... | 01/01/2002 |
| 6211398 | Process for the preparation of dialkyl esters of naphthalenedicarboxylic acids Disclosed is a process for the production and purification of dialkyl naphthalenedicarboxylate compounds wherein a crude naphthalenediacarboxylic acid is esterified with an alkanol such as methanol to produce a crude esterification product comprising dial... | 04/03/2001 |
| 6171449 | Cascade reboiling of ethylbenzene/styrene columns Apparatus and process are disclosed for the distillation separation of styrene monomer from ethylbenzene utilizing a split feed to two distillation columns in conjunction with cascade reboiling utilizing thermal energy from the overhead of one column to s... | 01/09/2001 |
| 6120654 | Process for the purification of maleic anhydride Processes for the purification and color stabilization of crude maleic anhydride by distillation in a batch or continuous distillation column.... | 09/19/2000 |
| 6096941 | Distillation of vinylaromatic monomer Process technology is described making possible substantial improvements in the separation and recovery of highly pure vinyl aromatic monomers, notably styrene. A number of design, construction and operational features are made available for selection and... | 08/01/2000 |
| 6096171 | Process for the distillation of crude ester in the DMT/PTA process A process for purifying a crude ester containing dimethyl terephthalate, includes flash distilling a mixture including para-xylene and methyl para-toluate, and separating the crude ester into fractions. By separating the crude ester with a distillation co... | 08/01/2000 |
| 6045661 | Process and apparatus for recovering diluent, monomer, and comonomer from a polymerization reactor effluent A process and apparatus are provided for recovering diluent, unreacted monomer, and unreacted comonomer from a polymerization reactor effluent. The comonomer has a boiling point higher than the boiling point of the monomer and the diluent has a boiling po... | 04/04/2000 |
| 6045808 | Method for removing high boiling solvents from drug formulations by vacuum drying A method for removing a high boiling solvent from a pharmaceutical composition dissolved in the high boiling solvent comprising adding a low boiling co-solvent to the solution to form a mixture of the high boiling solvent and the low boiling co-solvent, a... | 04/04/2000 |
| 6030505 | Process for the continuous preparation of pure 5-formyl valeric acid esters 5-Formylvaleric esters are prepared in a yield of not less than 90% by distillation of a formylvaleric ester mixture of 5-formylvaleric ester and either 3- or 4-formylvaleric ester or a mixture of 3- and 4-formylvaleric esters, where the ester radicals of... | 02/29/2000 |
| 5993608 | Process for recovering processing liquids A process for recovering processing liquids such as gas-treating liquids wherein a feed mixture containing the processing liquid and components or impurities that are more volatile and less volatile than the processing liquid is initially heated in a firs... | 11/30/1999 |
| 5993607 | Process for the purification of chlorinated aromatic hydrocarbons In a process for the purification by distillation of chlorinated aromatic hydrocarbons originating from the chlorination of aromatic hydrocarbons in the presence of FeCl3, the crude reaction product is first partially degassed and then directly... | 11/30/1999 |
| 5948212 | Titanium separation process A process for the separation of a mixture of a titanium tetrahalide, a reaction diluent of an intermediate boiling point and at least one of a titanium alkoxide, ester or complex thereof without the aid of a distinct separation solvent by subjecting the m... | 09/07/1999 |
| 5935388 | Distillation plant with a heat pump A distillation plant includes a heat pump whose working fluid is compressed by a vapor jet compressor. A collection location for a liquid is arranged in the stripper part of a distillation column of the plant. At least a portion of the collected liquid is... | 08/10/1999 |
| 5916422 | Method of purifying acetic acid A method for purifying acetic acid containing at least one component selected from the group consisting of unsaturated compounds and carbonyl compounds as an impurity involves the step of purifying the acetic acid with a distillation column having at leas... | 06/29/1999 |
| 5874575 | Preparation of caprolactam An improved process for the preparation of caprolactam by heating 6-aminocapronitrile in the presence of a heterogenous catalyst and water under superatmospheric pressure without rapid deactivation of the catalysts used. The process further includes the a... | 02/23/1999 |
| 5858178 | Process and device for preparing and/or extracting samples using a vaporizable agent at high temperature A process for preparing and/or extracting samples by heating them together with a solvent in a container under pressure, using a Soxhlet apparatus. The samples are dried by heating in a container; and the resultant vapors are drawn off to generate a vacuu... | 01/12/1999 |
| 5853549 | Desalination of seawater by evaporation in a multi-stack array of vertical tube bundles, with waste heat. A large and economical type of multi-stack vertical tube evaporator (MS-VTE) having units of multiple stacks of vertical tube bundles or stages mounted in a single vessel, and having its liquid feed pumped to the uppermost VTE bundle stack or stage and ha... | 12/29/1998 |
| 5833813 | Method of recovering and dehydrating ethylene sulfide A method of recovering ethylene sulfide from a hydrous stock solution (solution) containing ethylene sulfide, toluene (hydrophobic organic compound) having a higher boiling point than ethylene sulfide, and a compound having a higher boiling point than tol... | 11/10/1998 |
