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| Number | Title | Issue Date |
| 7569710 | Ethylene oxide recovery process An improved process for the recovery of a high-purity, ethylene oxide-water stream for use as feed to integrated ethylene glycol or ethylene oxide purification reactors by first contacting the gaseous effluent from ethylene oxide reactors with an aqueous alkaline qu... | 08/04/2009 |
| 7404834 | Ethylene oxide plant operation In an ethylene oxide process, the stripping and reabsorption operations, normally carried out in separate vessels, are carried out in a single vessel which is divided by a baffle into separate sections where reabsorption and stripping are carried out. ... | 07/29/2008 |
| 7323579 | Separation of propylene oxide from a mixture comprising propylene oxide and methanol A method of separating propylene oxide from a mixture (M) comprising 5 to 50 percent by weight propylene oxide and 50 to 85 percent by weight methanol, said method comprising (i) introducing said mixture (M) into an extractive dist... | 01/29/2008 |
| 7238817 | Direct epoxidation process A process is disclosed for reacting an olefin, hydrogen, and oxygen in a reactor in the presence of a catalyst comprising a transition metal zeolite and a noble metal to produce a reaction mixture comprising an epoxide and acidic byproducts. A portion of the reactio... | 07/03/2007 |
| 7235677 | Method of improving the operation of an existing ethylene oxide manufacturing process and system Described is a method of improving the process and operation of an existing system for manufacturing ethylene oxide. The ethylene oxide manufacturing system includes an epoxidation reactor system containing a volume of high activity epoxidation catalyst. The method ... | 06/26/2007 |
| 7153985 | Ethylene oxide production A process for the formation of ethylene oxide wherein the presence of at least one hydrocarbon having four carbon atoms per molecule in the recycle loop gas of the process is used as an indicator of impending post-ignition conditions. ... | 12/26/2006 |
| 7084284 | Separation process Phosphine and/or phosphine oxide promoters are effectively separated from propylene oxide reaction solvents through use of a membrane effective to retain the phosphine and/or phosphine oxide. ... | 08/01/2006 |
| 6958304 | Method for regenerating a zeolite catalyst A process for the regeneration of a zeolite catalyst which comprises treating the catalyst thermally in the presence of a gas stream at temperatures above 120° C., the weight-based residence time of the gas stream over the catalyst during the thermal treatment bein... | 10/25/2005 |
| 6749668 | Process for the recovery of combustible components of a gas stream A process for the recovery of combustible components of a gas stream containing the combustible components and oxygen by selective absorption of the combustible components in a solvent, whereby during the absorption the gas phase is dispersed in a continuous liquid ... | 06/15/2004 |
| 6727389 | Cyclic organo-oxide storage vent scrubbing A method for processing at least one cyclic organo-oxide using a closed loop scrubber/holding tank system that contains at least one amine, and circulating the amine through the closed loop while admitting the cyclic organo-oxide to the closed loop. ... | 04/27/2004 |
| 6596882 | Recovery and purification of 3,4-epoxy-1-butene using water-miscible solvents Disclosed is a method of recovering and purifying 3,4-epoxy-1-butene (epoxybutene) from an epoxidation effluent gas obtained by the vapor phase, catalytic, partial oxidation of 1,3-butadiene (butadiene) with molecular oxygen in the presence of a silver ca... | 07/22/2003 |
| 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 |
| 6500970 | Recovery and purification of 3,4-epoxy-1-butene using high-boiling solvents Disclosed is a process of recovering 3,4-epoxy-1-butene (epoxybutene) from an epoxybutene-laden reaction product gas by absorption into a high-boiling solvent. Also disclosed is a process for the purification of the epoxybutene by separating epoxybutene f... | 12/31/2002 |
| 6452027 | Heat recovery procedure The present invention provides a process treating the cycle gas from an ethylene oxide reactor to avoid heat losses in a carbonate scrubbing system as well as glycol formation in the carbonate scrubbing and catalyst contamination upon cycle gas recycle.... | 09/17/2002 |
| 6395913 | Recovery and purification of 3,4-epoxy-1-butene Disclosed is a method of recovering and purifying 3,4-epoxy-1-butene (epoxybutene) from a reaction product gas, obtained by the vapor phase catalytic partial oxidation of 1,3-butadiene with oxygen over a silver catalyst. The recovery and purification comp... | 05/28/2002 |
| 6323351 | Process for the direct oxidation of olefins to olefin oxides A process and catalysts for the direct oxidation of an olefin having three or more carbon atoms, such as propylene, by oxygen to an olefin oxide, such as propylene oxide. The process involves contacting the olefin under reaction conditions with oxygen in ... | 11/27/2001 |
| 6024840 | Propylene oxide purification Propylene oxide obtained by an epoxidation process which uses methanol as a solvent may be effectively treated to remove acetaldehyde by subjecting the crude epoxidation reaction product to fractional distillation. The methanol solvent is utilized during ... | 02/15/2000 |
| 6018061 | Process for recovering 3,4-epoxy-1-butene A process for recovering 3,4-epoxy-1-butene from a vapor phase catalytic oxidation reactor effluent where 1,3-butadiene is reacted with oxygen over a silver catalyst, the process includes the steps of contacting the reactor effluent with an absorbent in a... | 01/25/2000 |
| 5756779 | Recovery of 3,4-epoxy-1-butene from 1,3-butadiene oxidation effluents Disclosed are improved processes for the recovery of 3,4-epoxy-1-butene (epoxybutene) from an epoxidation effluent comprising epoxybutane, butadiene, oxygen and an inert diluent obtained by the selective epoxidation of butadiene with an oxygen-containing ... | 05/26/1998 |
| 5563282 | Thermal process for removal of contaminants from process streams A method of controlling the build-up of organic and/or inorganic contaminants (e.g., carbonates, nitrates, nitrites, and the like) in an aqueous process stream, comprising directing at least some of the contaminated stream to a heating means wherein at le... | 10/08/1996 |
| 5559255 | Method of recovering ethylene oxide The present invention relates to a method of recovering ethylene oxide comprising the steps of: bringing a mixed gas containing ethylene oxide into contact with an absorbent so as to cause the absorbent to absorb the ethylene oxide; and stripping and separatin... | 09/24/1996 |
| 5519152 | Manufacturing ethylene oxide A process of manufacturing ethylene oxide is presented in ethylene and free oxygen are reacted in the presence of methane, carbon dioxide, and argon in a reactor to form an effluent comprising ethylene oxide; the effluent is then withdrawn and ethylene ox... | 05/21/1996 |
| 5440058 | Method for separating compounds in process streams A method, especially applicable on a continuous basis to commercial process streams, for treating unwanted by-products and/or impurities contained in those streams. The method comprises the reaction in situ of such by-products or impurities with a reagent... | 08/08/1995 |
| 5336791 | Production of ethylene oxide A gas stream from a reaction in which ethylene oxide is produced by reacting ethylene with oxygen which gas stream comprises oxides of nitrogen and steam the gas stream is contacted with an aqueous alkaline quench solution and ethylene oxide is then recov... | 08/09/1994 |
| 5331084 | Fluorine-substituted epoxides and a method for their preparation Fluorine-substituted epoxides of the formula ##STR1## in which the substituents R1 to R4, independently of one another, have the following meanings: R1 to R4 =H, fluorine, C1 - to C18 -alky... | 07/19/1994 |
| 5312931 | Recovery of 3,4-epoxy-1-butene from 1,3,-butadiene oxidation effluents Disclosed are improved processes for the recovery of 3,4-epoxy-1-butene (EpB) from an epoxidation effluent comprising EpB, butadiene, oxygen and butane obtained by the selective epoxidation of butadiene with an oxygen-containing gas in the presence of a c... | 05/17/1994 |
| 5248794 | Process for purifying propylene oxide A process for purifying propylene oxide containing an unacceptable quantity of a poly(propylene oxide) polymer contaminant having a molecular weight of at least about 50,000, comprising the step of filtering propylene oxide containing such polymer contami... | 09/28/1993 |
| 5233060 | Ethylene recovery in direct-oxidation ethylene oxide processes In a direct-oxidation ethylene oxide process of the type comprising a) reacting a feed gas stream including ethylene and a commercially-pure oxygen in one or more reactors and b) absorbing out ethylene oxide from the product stream from the one or more re... | 08/03/1993 |
| 5043461 | Process for the production of oxides An improved process for the production of oxides from hydrocarbons by reaction with oxygen, air or a gas enriched in oxygen relative to air, preferably the latter, in the presence of a suitable catalyst. An alkane, e.g. propane, is converted to an alkene ... | 08/27/1991 |
| 5008414 | Process for the production of oxides An improved process is provided for the production of oxides from hydrocarbons by reaction with oxygen, air or a gas enriched in oxygen relative to air, preferably the latter in the presence of an oxidation catalyst. An alkane, e.g. propane, is converted ... | 04/16/1991 |
| 4983260 | Process for concentrating aqueous ethylene oxide solutions A process for the concentration of ethylene oxide in an impure solution thereof including adding the solution and steam to a distillation column, recovering the gaseous stream therefrom containing ethylene oxide, and progressively condensing the steamed s... | 01/08/1991 |
| 4875909 | Method for recovery of ethylene oxide In the recovery of ethylene oxide from the gas resulting from catalytic gas-phase oxidation of ethylene with a molecular oxygen-containing gas and consequently containing ethylene oxide, a method which comprises subjecting the bottom liquid of an ethylene... | 10/24/1989 |
| 4847393 | Process for the production of ethylene oxide In a process of producing ethylene oxide by contacting ethylene and oxygen with a main body of a solid catalyst in a reaction zone and passing product from that zone through a substantial volume to a cooler, acetaldehyde is produced by isomerization of et... | 07/11/1989 |
| 4822900 | Production of ethylene oxide Ethylene oxide is produced by contacting ethylene and oxygen in the presence of a chlorine containing reaction modifier with a silver containing catalyst, nitropropane being also present. The nitropropane raises the selectivity of the process.... | 04/18/1989 |
| 4508927 | Preparation of glycols from ethylene oxide A process for preparation of glycols in which the vapor remaining after the partial condensation of a conventional ethylene oxide stripper overhead vapor stream is contacted with an aqueous solution of ethylene carbonate to recover ethylene oxide. No wate... | 04/02/1985 |
| 4469492 | Process for the isothermal absorption of ethylene oxide using film absorbers This invention relates to a process for the isothermal absorption of the ethylene oxide contained in the gas from an ethylene oxide production plant. This process is characterized in that the gas is firstly cooled to a temperature of between 5° and 60° ... | 09/04/1984 |
| 4335014 | Process for improving the activity of supported silver catalysts Supported silver catalysts, which should have as high an activity as possible, are employed for the manufacture of ethylene oxide by oxidizing ethylene by means of oxygen or air. A process is described for improving the activity of supported silver cataly... | 06/15/1982 |
| 4256604 | Method for mixing gases and apparatus used therefor A method for mixing a hydrocarbon-containing gas flow with a molecular oxygen-containing gas flow, wherein at least one aqueous medium sealing zone allowing the hydrocarbon-containing gas flow to pass therethrough is provided by sealing a side of introduc... | 03/17/1981 |
| 4233221 | Ethylene carbonate process An improved process for making ethylene carbonate wherein ethylene oxide and carbon dioxide are passed over an anion exchange resin catalyst and wherein the ethylene oxide and carbon dioxide reactants are absorbed from the effluent of an ethylene oxide re... | 11/11/1980 |
| 4221727 | Ethylene oxide recovery In the manufacture of ethylene oxide by the partial oxidation of ethylene in the vapor phase, the effluent gases from the reaction are absorbed in water prior to separation and purification of the ethylene oxide. The present invention is the improvement i... | 09/09/1980 |
