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| Number | Title | Issue Date |
| 7708865 | Vapor-compression evaporation system and method According to one embodiment of the invention, a vapor-compression evaporation system includes a plurality of vessels in series each containing a feed having a nonvolatile component, a mechanical compressor coupled to the last vessel in the series and operable to rec... | 05/04/2010 |
| 7678237 | Heat integrated distillation column A heat integrated distillation column including a cylindrical shell having an upper and a lower end and at least one first inner volume and at least one second inner volume in the shell, and being in heat exchanging contact with each other through a wall separating ... | 03/16/2010 |
| 7378536 | Method for producing propylene oxide Process for preparing propylene oxide, which comprises at least the steps (iii) and (iv) (iii) separating off propylene oxide from a mixture (M1) comprising propylene oxide and at least one solvent by distillation in a distillation column, giving a bott... | 05/27/2008 |
| 7368039 | Distiller employing cyclical evaporation-surface wetting A distillation unit (10) employs a rotary heat exchanger (32) forming a multiplicity of evaporation chambers (56) into which a liquid to be purified is sprayed for evaporation. Spray arms (58) spray at a steady rate into all of the evapor... | 05/06/2008 |
| 7347918 | Energy efficient evaporation system An evaporation system uses the weight of condensed liquid as an energy source. An inlet feed is introduced into an enclosure through an inlet. The inlet feed is vaporized in an evaporation region of the enclosure, and condensed to a liquid in a condensation region o... | 03/25/2008 |
| 7262330 | Process of producing aldehydes A process of producing aldehydes in a continuous hydroformylation process of continuously reacting an olefinic unsaturated compound with carbon monoxide and hydrogen in the presence of a rhodium-phosphite based complex catalyst and continuously separating at least o... | 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 |
| 7232931 | Method for the rhodium-catalyzed hydroformylation of olefins with reduction of rhodium losses Process for preparing aldehydes and alcohols by rhodium-catalyzed hydroformylation of olefins having 6–20 carbon atoms with subsequent separation by distillation of the output from the hydroformylation reaction into the hydroformylation products and a rhodium-cont... | 06/19/2007 |
| 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 |
| 6969446 | Method for producing concentrated nitric acid and installation for carrying out a method of this type Process for producing a nitric acid of a concentration from 75 to 99.9% from a more diluted nitric acid, wherein a nitric acid of a concentration of about 45 to 70% is rectified in contact with a liquid extraction medium to prevent the formation of a nitric acid-wat... | 11/29/2005 |
| 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 |
| 6716355 | Method for the purification of a liquid by membrane distillation, in particular for the production of desalinated water from seawater or brackish water or process water The following process steps are carried out in order to purify a liquid by membrane distillation, in particular to produce desalinated water from seawater or brackish water or process water: passing a relatively warn vaporising stream of liquid (retentate str... | 04/06/2004 |
| 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 |
| 6536523 | Water treatment process for thermal heavy oil recovery There is disclosed a method and apparatus for treating produced water from a heavy oil thermal recovery unit to achieve water recovery and recycle levels of greater than 80% and as high as 100% to achieve zero discharge criteria. The method includes the i... | 03/25/2003 |
| 6423187 | Heat exchanger mechanism using capillary wipers for a thin film distiller A thin film distiller is provided which applies distilland to an evaporative side by the use of wicks which work by capillary action. The evaporated vapor is transferred to the condensate side after being compressed to a higher pressure where it is conden... | 07/23/2002 |
| 6383342 | Cluster rule compliance with reduced steam consumption A method and system for handling foul condensate containing Hazardous Air Pollutants (HAPs) in a cellulose pulp mill has enhanced energy efficiency and lower cooling water usage, while complying with the Cluster Rules and other environmental regulations. ... | 05/07/2002 |
| 6375805 | Apparatus and process for purifying a liquid An improved continuous process and apparatus for treating an impure liquid to produce purified liquid, particularly, water, the process having an electrically activating a thermoelectric module to provide a first heated surface and a cooler surface; feedi... | 04/23/2002 |
| 6375803 | Mechanical vapor recompression separation process A method and apparatus for removing a contaminant from a fluid feed stream containing the contaminant. The method includes the steps of providing a feed stream (10) and heating it in a first step (18) to at least partially remove some of the contaminants ... | 04/23/2002 |
| 6294054 | Water purification system A compact distilled water system for home, marine, and laboratory use which includes a closed circuit that provides high pressure water for dispensing water to remote locations and that also creates, in conjunction with an eductor, a partial vacuum in the... | 09/25/2001 |
| 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 |
| 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 |
| 5897749 | Continuous distillative separation of liquid mixtures which contain (meth) acrylic acid as the main component Liquid mixtures which contain (meth)acrylic acid as the main component are continuously separated in a distillation apparatus which comprises a still, a condenser and a connection between still and condenser and to which the liquid mixture to be separated... | 04/27/1999 |
| 5865957 | Method for producing butyraldehydes A method for producing butyraldehydes, by separating and purifying mixed butyraldehyde products formed by hydroformylation of propylene, into n-butyraldehyde and isobutyraldehyde by using a distillation column, wherein the distillation column is operated ... | 02/02/1999 |
| 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 |
| 5830314 | Cleaning condensates from multi-effect evaporator of cellulose pulp waste liquors Volatile compounds, such as methanol, are separated from secondary condensates formed in multi-effect evaporation of waste liquor, such as black liquor, from cellulose pulp processes. The condensable secondary vapor is condensed into first and second cond... | 11/03/1998 |
| 5695614 | Method for processing waste liquids in particular industrial waste water having a high solids content A method for processing waste liquids, having high solids content. The process includes the steps of spraying and evaporating the waste liquid together with a dry gas in a counterflow of dry gas within a spray tower, collecting the solids of the waste wat... | 12/09/1997 |
| 5573645 | Process and apparatus for the separation of aromatic hydrocarbons A distillation process and apparatus for recovering high purity aromatic products from a mixed aromatic hydrocarbon feedstock containing benzene, toluene and xylene by use of distillation towers integrated by heat exchange whereby substantial savings in o... | 11/12/1996 |
| 5565068 | Energy conservation during plural stage distillation In the multistage distillation of a methyl tertiary butyl ether reaction product comprising methyl tertiary butyl ether, tertiary butyl alcohol, methanol, isobutylene and water, the methyl tertiary butyl ether reaction product is separated in a primary me... | 10/15/1996 |
| 5554264 | Multiple reboiler system To heat the circulating reboiler streams of multiple distillation columns a fired reboiler is provided for a first column requiring the most heat. A portion of the bottoms from the first column is passed through the tubes of the heater in the fired reboil... | 09/10/1996 |
| 5490906 | Fluid distillation apparatus Several embodiments of a fluid distillation system wherein each embodiment uses a primary container or chamber for water or fluid to be distilled and a secondary water container or chamber. The two chambers are adjacent to each other, and the secondary ch... | 02/13/1996 |
| 5457277 | Multiple reboiler system To heat the circulating reboiler streams of multiple distillation columns a fired reboiler is provided for a first column requiring the most heat. A portion of the bottoms from the first column is passed through the tubes of the heater in the fired reboil... | 10/10/1995 |
| 5411640 | Centrifugal distillation apparatus The disclosed invention is an apparatus for the distillation of liquids. The apparatus has a plurality of vertically-stacked, parallel disks which are rotated. The liquid to be distilled is introduced into the center of the disk stack and migrates by cent... | 05/02/1995 |
| 5346593 | Intermediate reboiler for a methanol plant A methanol refining column and method using an intermediate reboiler. Use of the intermediate reboiler reduces methanol production energy requirements. A side stream at or near a fusel oil takeoff point is heated in an intermediate reboiler by a low tempe... | 09/13/1994 |
| 5332476 | Water distillation and aeration apparatus An apparatus and method for fluid distillation in general, and in particular, of water, adapted for consumer or home use, but capable of being made and operated so that it is suitable for separating solvents and solutes and other industrial use. The appar... | 07/26/1994 |
| 5314586 | Purifying and energy-saving water fountain capable of supplying icy, warm and hot distilled water A distilled water fountain which is capable of supplying the users with purified icy, warm and hot drinking water and composed of a pre-heating exchanger, a condensing-and-heating exchanger, a distilled water tank, a steam generator, and an electronic chi... | 05/24/1994 |
| 5238540 | Method of obtaining a pure aromatic hydrocarbon from a sump product of an extractive distillation of a hydrocarbon mixture The method of obtaining a pure aromatic hydrocarbon from a hydrocarbon starting mixture includes extractively distilling the hydrocarbon starting mixture with a selective solvent; feeding the sump product of the extractive distillation through a first and... | 08/24/1993 |
| 5236558 | Method to recycle spent ethylene glycol A method to recycle spent ethylene glycol in a continuous process for the manufacture of polyethylene terephthalate in at least one reactor vessel which includes: a. condensing the overhead vapor of spent ethylene glycol, water and other byproducts from t... | 08/17/1993 |
| 5232085 | Distillation system with a hydrophobic porous membrane A distillation system has a degassing tank, a distiller for generating vapor of raw water taken from the degassing tank, a heater for heating the vapor from the distiller to convert the vapor into a high temperature and pressure vapor, a hydrophobic porou... | 08/03/1993 |
| 5209828 | System for concentrating a spent caustic stream A system and method of concentrating spent caustic at a refinery has a multi-stage flash drum for separating a spent caustic stream into an overhead output stream including vaporized water and volatile organic compounds, and a concentrated spent caustic o... | 05/11/1993 |
| 5200040 | Method for rectification and apparatus therefor A method for rectification includes steps of supplying raw materials to a rectifying column from a raw material feed pipe; returning a refluent fluid from a refluxing pipe to the column; leading a hold-up liquid from a bottom tank having a higher surface ... | 04/06/1993 |
