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| Number | Title | Issue Date |
| 8101808 | Recovery of higher alcohols from dilute aqueous solutions This invention is directed to methods for recovery of C3-C6 alcohols from dilute aqueous solutions, such as fermentation broths. Such methods provide improved volumetric productivity for the fermentation and allows recovery of the alcohol. Such methods also allow fo... | 01/24/2012 |
| 8067646 | Combined temperature controlled adsorption and heat pump process for fuel ethanol dehydration Systems and processes for dehydration of a process stream in the production of motor fuel grade ethanol (MFGE) can include temperature controlled adsorption of water in the process stream, and heat pumping of the associated heat of adsorption. The process can includ... | 11/29/2011 |
| 7795479 | Temperature controlled adsorption multi-step regeneration cycle Systems and processes for dehydration of a process stream in the production of motor fuel grade ethanol (MFGE) can include temperature controlled adsorption of water in the process stream, and heat pumping of the associated heat of adsorption. The process includes p... | 09/14/2010 |
| 7309403 | Method for avoiding corrosion The invention relates to a method of avoiding corrosion in the separation of methylamine from a product stream (10) which is obtained in the preparation of methylamines by gas-phase reaction of methanol and ammonia and includes monomethylamine, dimethylamine,... | 12/18/2007 |
| 7232505 | Method of regenerating an aqueous glycol solution containing salts Method of regenerating a glycol solution containing water, hydrocarbons and salts. The glycol solution is expanded in drum (2), then distilled in column (7). The concentrated glycol collected at the level of reboiler (8) is placed under vacuum t... | 06/19/2007 |
| 7220388 | Micro-channel chemical concentrator Apparatus and method for increasing the concentration of a chemical substance in a fluid comprise a micro-fluidic elongated channel formed in a substrate, with the channel being in fluid-flow communication with an ambient region along its elongated dimension. In gen... | 05/22/2007 |
| 6909026 | Process for liquid phase aromatics alkylation comprising in-situ catalyst reactivation with polar compounds The catalyst becomes at least partially deactivated by sorbing catalyst poisons present in the feed during a process for alkylating aromatics by contacting a feed containing benzene, toluene, xylenes, alkylbenzenes, naphthalene or substituted naphthalenes under liqu... | 06/21/2005 |
| 6770790 | Purification of tertiary butyl alcohol The invention is a method to purify tertiary butyl alcohol by contact with at least two solid adsorbents comprising aluminum oxide and a large pore zeolite such as zeolite X. The purification method successfully improves product quality and reduces the amount of imp... | 08/03/2004 |
| 6733637 | Process for producing ultra-high purity isopropanol A process for producing high purity isopropyl alcohol. In one embodiment, the process includes the steps of: (a) feeding a feed stream comprising at least about 99.9 wt. % isopropyl alcohol into a separation column; (b) separating the isopropyl alcohol into an overh... | 05/11/2004 |
| 6605192 | 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, preferably in a battery, vacuum dewatering and subsequent purifying distillation, wherein during the vacuum d... | 08/12/2003 |
| 6582607 | Method of dewatering organic liquids Process for dewatering organic liquids admixed with water wherein the admixture is brought into contact with a molecular sieve. The moleculat sieve is pretreated so as to reduce its acid site concentration and attain an ammonia TPD value of 18 mmol/g or l... | 06/24/2003 |
| 6375807 | Separation of ethanol mixtures by extractive distillation A method of separating ethanol and ethyl acetate, and ethanol and water involves distilling a mixture of the components by an extractive distillation process in the presence of an extractive distillation solvent. The extractive distillation solvent may be... | 04/23/2002 |
| 6137018 | Chemical refining method and reuse system for semiconductor device manufacturing A chemical refining and reuse method and apparatus efficiently remove water from a waste chemical used in a semiconductor device fabrication process. The method is superior to conventional refining methods, in that water is removed at the end of the refin... | 10/24/2000 |
| 6080280 | Structure for refining glycol in a natural gas dehydration plant Contaminated glycol in a natural gas dehydration plant is refined by vacuum distillation. The equipment to perform the refining by vacuum distillation is mounted upon a trailer. The equipment on the trailer is connected by an inlet line to the dehydration... | 06/27/2000 |
| 5985100 | Process for separating butanol and dibutyl ether by means of dual-pressure distillation Butanol and dibutyl ether are separated from a mixture containing water, dibutyl ether and n-butanol, 2-butanol and/or isobutanol by a process in which a) the mixture is introduced into a first distillation column, essentially butanol is separated off at ... | 11/16/1999 |
| 5981812 | Process for preparing , ω-alkenols The invention relates to a process for preparing ,ω-C4 -C20 -alkenols by catalytic monodehydration of ,ω-alkanediols over a catalyst system comprising the combination of aluminum phosphate and barium phosphate. The ga... | 11/09/1999 |
| 5976324 | Removal of water from reaction mixtures A process as been found for the removal of water from reaction mixtures of acids or acid anhydrides or of aqueous alkali metal hydroxide solutions with alcohols using vapor permeation/pervaporation at the boiling point of the reaction mixture, which inclu... | 11/02/1999 |
| 5977416 | Dehydration catalyst and process for producing a monoalkylether of a dihydric phenolic compound using same A dehydration catalyst useful for producing a monoalkylether of dihydric phenolic compound by a dehydration reaction of a dihydric phenolic compound with a lower alkyl alcohol with a high conversion at a high selectivity, comprises at least one inorganic ... | 11/02/1999 |
| 5928477 | Method and apparatus for removing water from an aqueous fluid mixture A method and apparatus permits concentration of a water-miscible organic liquid in a mixture of such liquid and water, with recovery of a desired concentrate of the water-miscible organic liquid and water, and a relatively clean water containing only a ve... | 07/27/1999 |
| 5897750 | Separation of acetone from isopropanol-water mixtures by extractive distillation Acetone cannot be separated from a mixture of isopropanol and water because of the closeness of their boiling points. Acetone can be easily separated from isopropanol and water by extractive distillation. Effective extractive agents are 1-nitropropane, 3-... | 04/27/1999 |
| 5868906 | Dehydration and purification of isopropyl alcohol to an ultradry and ultrapure level A method for the on-site reprocessing of isopropyl alcohol used in semiconductor manufacturing, to generate an ultradry and ultrapure isopropyl alcohol. This ultradry and ultrapure isopropyl alcohol is produced through a pervaporation step, followed by do... | 02/09/1999 |
| 5863391 | Purification of a methanol stream Acetaldehyde may be effectively removed from a contaminated methanol stream using a distillation method wherein a solvent stream containing a relatively heavy polar compound such as water or propylene glycol is utilized as an extractive distillation solve... | 01/26/1999 |
| 5800681 | Separation of ethanol, isopropanol and water mixtures by extractive distillation Ethanol, isopropanol and water cannot be separated from each other by distillation or rectification because of minimum azeotropes. They are readily separated by extractive distillation. Effective agents are: dimethylsulfoxide for ethanol, phenol for isopr... | 09/01/1998 |
| 5762765 | Separation of ethanol, isopropanol and water mixtures by azeotropic distillation Ethanol, isopropanol and water cannot be separated from each other by rectification because of the presence of minimum azeotropes. They are readily separated by azeotropic distillation. Effective agents are cyclopentane for ethanol from water, methyl acet... | 06/09/1998 |
| 5535877 | Glycol concentrator A method and apparatus for removing water from a solution of water and glycol solution. The apparatus finds application in recycling of glycol wherein a water and glycol solution having as much as a 95% water content when introduced to the apparatus leave... | 07/16/1996 |
| 5501776 | Process for the regeneration of a desiccant For the regeneration of a liquid desiccant, a stripping agent is used which is liquid at ambient temperature and pressure, and forms a heteroazeotrope with water, along with the following steps: (a) distillation of the water-laden liquid desiccant to form... | 03/26/1996 |
| 5494556 | Method of and an apparatus for separating a liquid mixture A method of separating a liquid mixture wherein the liquid mixture is heated; the heated liquid mixture is supplied to a pervaporation membrane module to separate a permeable component of the liquid; a portion of non-permeated liquid is circulated through... | 02/27/1996 |
| 5360923 | Process for separating off alkanols, mixtures of alkanols and water or water itself from oxygen-containing organic compounds of higher carbon number A first alkanol having 1 to 3 C atoms or a mixture of this first alkanol with water or water itself can be separated off from oxygen-containing organic compounds having 3 to 7 C atoms from the group comprising second alkanols and dialkyl carbonates, which... | 11/01/1994 |
| 5348624 | Process for separating ethyl tert-butyl ether and ethanol For separating ETBE and ethanol the following principal stages are employed: (1) Extraction of ethanol by water, the raffinate being ETBE saturated in water and the extract an ethanol/water mixture containing a small proportion of ETBE; (2) Concentration ... | 09/20/1994 |
| 5264085 | Method of separating components of phenols mixture by distillation A method of continuously distilling off the components of a mixture containing phenols, water and methanol using a single distillation column, wherein methanol is recovered from the top of the column, water containing phenols is dragged as a side stream f... | 11/23/1993 |
| 5262013 | Coolant recycling method and apparatus A coolant recycling apparatus has a boiler and condenser for distilling a glycol and water from a used coolant. The glycol and water are recombined in a mixing tank to form a mixture having a desired ratio of water to glycol, and an inhibitor is added to ... | 11/16/1993 |
| 5250271 | Apparatus to concentrate and purify alcohol A method and an apparatus to condense and rectify alcohol, and more particularly to a method and an apparatus suitable for the energy-saving condensation and rectification of high-purity alcohol from the synthesized alcohol, the used alcohol aqueous solut... | 10/05/1993 |
| 5209940 | Stabilizing unmilled brown rice by ethanol vapors The present invention relates to stabilizing unmilled or partially milled brown rice by contact thereof with ethanol vapors. The present invention also encompasses products of said stabilizing including, stabilized unmilled or partially milled brown rice,... | 05/11/1993 |
| 5146009 | Process for the recovery of alcohols using an organic acid-modified polymer membrane According to the process of this invention, alcohols are recovered from aqueous acid solution by permeation of the alcohol through an organic-acid modified polymer membrane. An improved process for the manufacture of alcohols by acid absorption of olefins... | 09/08/1992 |
| 5138105 | Process and apparatus for recovering a lower alcohol from a mixture thereof with water A lower alcohol is recovered from a mixed liquid thereof with water, derived from a vapor drying procedure for a water-wetted article, for example, a water-washed lens or semiconductor wafer, by feeding the mixed liquid of a lower alcohol with water from ... | 08/11/1992 |
| 5124004 | Distillation process for ethanol A method of distillation employing a heat pump (which may be driven by a compressor) using a vapor stream from within the distillation system as a heat source and a liquid stream from within the distillation system as a heat sink. The selection of heat-so... | 06/23/1992 |
| 5091057 | Stripping process for water removal from alcohol A process for obtaining a substantially dry alcohol from a mixture comprising alcohol and water in a non-azeotropic amount by utilizing at least a portion of the alcohol in the mixture as the stripping medium.... | 02/25/1992 |
| 5085739 | Separation of the propyl alcohols from water by azeotropic or extractive distillation Isopropanol and n-propanol cannot be completely separated from water by conventional distillation or rectification because of the minimum boiling azeotrope. Isopropanol and n-propanol can be readily separated from water by using azeotropic or extractive d... | 02/04/1992 |
| 5084142 | Separation of tertiary butyl alcohol from water by azeotropic or extractive distillation t-Butyl alcohol cannot be completely separated from water by conventional distillation or rectification because of the minimum boiling azeotrope. t-Butyl alcohol can be readily separated from water by using azeotropic or extractive distillation. Typical e... | 01/28/1992 |
| 5059327 | Cross-linked separation membrane and process for pervaporation A preparation membrane for pervaporation which comprises a crosslinked reaction mixture of a polyvinyl alcohol or polyvinyl alcohol copolymer and a polystyrene sulfonic acid or polystyrene sulfonic acid copolymer. A method for separating a mixture of wate... | 10/22/1991 |
