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| Number | Title | Issue Date |
| 6586647 | Process for hydrogenating acetylenes A process for selectively hydrogenating C4-acetylenes in a liquid hydrocarbon stream containing largely butadiene has been developed. Hydrogen and the hydrocarbon stream are contacted with a catalytic composite comprising an inorganic oxide support having... | 07/01/2003 |
| 6576196 | Multiple parallel catalytic reactor assembly A multiple parallel catalytic reactor assembly has been developed. The assembly has (1) a plurality of vessels for containing catalyst, each vessel having an open end and a fluid permeable end (2) a plurality of bottoms, each bottom having an open end and... | 06/10/2003 |
| 6548029 | Apparatus for providing a pure hydrogen stream for use with fuel cells An apparatus is provided which comprises a thermosiphon shift reactor for the conversion of carbon monoxide and the generation of steam for use in a fuel processor for the conversion of hydrocarbon fuels into hydrogen and employs the hydrogen in a fuel ce... | 04/15/2003 |
| 6528316 | Control of solid catalyst alkylation process using raman spectroscopy An advanced method for controlling a solid catalyst alkylation process has been developed. At multiple locations throughout the alkylation process including multiple locations within the reaction zone, on-line Raman spectroscopy is used to measure the con... | 03/04/2003 |
| 6511528 | Purification of carbon dioxide Commonly available carbon dioxide may contain unacceptable amounts of compounds containing greater than about ten carbon atoms, sulfur-containing materials, and nitrogen-containing materials which are particularly detrimental to semiconductor and silicon ... | 01/28/2003 |
| 6472578 | Isomerization with adsorptive separation and dividing wall fractional distillation Construction and operational costs of recovering the high-octane components of an isomerization raffinate product of a simulated moving bed adsorptive separation process units are reduced by employing a dividing wall column to perform the separation. The ... | 10/29/2002 |
| 6471393 | Parallel stirring apparatus An apparatus and method useful for simultaneously stirring a plurality of reaction mixtures has been developed. The apparatus includes N gears, where N is at least 2, with each gear having a hub and multiple teeth, material removed from the hub to form a ... | 10/29/2002 |
| 6458955 | Process for preparation of pharmaceutically desired enantiomers Improved processes for preparation of high enantiomeric purity compounds center on resolution using simulated moving bed chromatography of a racemic precursor early in the synthesis. Resolution is effected with high enantiomeric purity, and subsequent rea... | 10/01/2002 |
| 6455736 | Process for preparation of pharmaceutically desired sertraline and sertraline analogs Improved processes for preparation of sertraline or sertraline analogs in high enantiomeric purity centers on resolution using simulated moving bed chromatography of isomeric racemic sertraline or sertraline analogs. Resolution is effected with high enant... | 09/24/2002 |
| 6442492 | Controlling moisture content of vapor in calcination or oxidation zones A process and apparatus for controlling the amount of water in the vapor of multiple zones of a calcination or oxidation operation have been developed. The process begins with calibration of a vessel housing a capacitance probe. The level of water in a ve... | 08/27/2002 |
| 6417419 | Process for hydrogenating acetylenes A process for selectively hydrogenating C4-acetylenes in a liquid hydrocarbon stream containing largely butadiene has been developed. Hydrogen and the hydrocarbon stream are contacted with a catalytic composite comprising an inorganic oxide support having... | 07/09/2002 |
| 6410794 | Process for preparation of pharmaceutically desired chiral tetralone from tetralones Improved processes for preparation of tetralones in high enantiomeric purity centers on resolution using simulated moving bed chromatography of a racemic tetralone derivative. Resolution is effected with high enantiomeric purity, and subsequent reactions ... | 06/25/2002 |
| 6407303 | Isomerization process with adsorptive separation and integrated fractional distillation Construction and operational costs of simulated moving bed adsorptive separation process units are reduced by recovering desorbent from both the extract and raffinate streams of the process in a single integrated fraction column. Both streams are fraction... | 06/18/2002 |
| 6403856 | Process for separating alkylaromatic hydrocarbons A process for separating at least one C8 alkylaromatic hydrocarbon from a mixture containing at least one C8 alkylaromatic hydrocarbon and at least one C9 or C10 alkylaromatic hydrocarbon using sodium zeolite Y,... | 06/11/2002 |
| 6403853 | Olefin oligomerization using surface modified molecular sieve catalyst In a process for the oligomerization of light olefins (e.g. propylene) to more valuable higher olefins (e.g. hexene), the use of a molecular sieve (e.g. SAPO-11) that has been acid washed has shown to provide superior selectivity to, and yield of, the des... | 06/11/2002 |
| 6403752 | Secondary aliphatic diamines as curing agents for polyurethanes and polyureas prepared using high-pressure impingement mixing Certain secondary aliphatic diamines are excellent chain extenders in the formation of polyurethanes, polyurea-polyurethane hybrids, and polyurea polymers, both elastomers and coatings, from both monomeric polyisocyanates and isocyanate-terminated prepoly... | 06/11/2002 |
| 6402958 | Chromatography column loading method An adsorbent bed is loaded into an HPLC column by a method which comprises fluidization of the adsorbent. The adsorbent may be added as a slurry which is then fluidized and not allowed to settle. The adsorbent bed is then immediately compressed.... | 06/11/2002 |
| 6395950 | Isomerization with adsorptive separation and dividing wall fractional distillation Construction and operational costs of recovering the high-octane components of an isomerization raffinate product of a simulated moving bed adsorptive separation process units are reduced by employing a dividing wall column to perform the separation. The ... | 05/28/2002 |
| 6368865 | Combinatorial process for performing catalytic chemical reactions A combinatorial process for simultaneously conducting multiple catalytic chemical reactions in parallel has been developed. At least one catalyst is contained in the reaction zones of a plurality of reactors, each reactor having a reactor insert placed wi... | 04/09/2002 |
| 6361203 | Parallel stirring apparatus An apparatus and method useful for simultaneously stirring a plurality of reaction mixtures has been developed. The apparatus includes N gears, where N is at least 2, with each gear having a hub and multiple teeth, material removed from the hub to form a ... | 03/26/2002 |
| 6342185 | Combinatorial catalytic reactor A reactor for conducting catalytic chemical reactions has been developed. The reactor has a well having an open end and a closed end. The reactor also has a sleeve having a top end and a bottom end. The bottom end of the sleeve is inserted within the open... | 01/29/2002 |
| 6340432 | Method of making a chiral stationary phase based on yohimbine A chromatographic process for separating racemic mixtures using a set of chiral stationary phases based on yohimbine and its derivatives has been developed. In particular, the hydroxyl functionality of yohimbine and its analogs is covalently bonded via a ... | 01/22/2002 |
| 6327334 | Method of rapidly screening X-ray powder diffraction patterns A method for rapidly screening multiple X-ray powder diffraction patterns, such as those generated through combinatorial chemistry, has been developed. The method is directed toward measuring X-ray powder diffraction patterns of a set of samples, factorin... | 12/04/2001 |
| 6162949 | Process for preparation of the pharmaceutically desired (S)-oxetine enantiomers Improved processes for preparation of the (S)-oxetines in high enantiomeric purity centers on resolution using simulated moving bed chromatography of a racemic precursor early in the oxetine synthesis. Resolution is effected with high enantiomeric purity,... | 12/19/2000 |
| 6137024 | Process for separating meta-xylene A process for separating meta-xylene from a mixture containing meta-xylene, para-xylene, and ortho-xylene has been developed. The process involves contacting the mixture with zeolite Beta to effect the adsorption of the para-xylene, ortho-xylene, and ethy... | 10/24/2000 |
| 6132606 | Chiral stationary phase based on yohimbine A chromatographic process for separating racemic mixtures using a set of chiral stationary phases based on yohimbine and its derivatives has been developed. In particular, the hydroxyl functionality of yohimbine and its analogs is covalently bonded via a ... | 10/17/2000 |
| 6118036 | Alkane isomerization using reversible flow A process to isomerize at least one normal or mono-methyl-branched alkane to form at least one multi-methyl-branched alkane has been developed. At least one normal or mono-methyl-branched is introduced to a reaction zone to form at least one multi-methyl-... | 09/12/2000 |
| 6107526 | Process for producing ethyl tertiary butyl ether A catalytic distillation process for producing high purity ethyl tertiary butyl ether that contains less than 0.6 weight percent ethanol, and preferably less than 0.07 weight percent ethanol, has been developed. The high purity ethyl tertiary butyl ether ... | 08/22/2000 |
| 6104033 | Method of determining fluid level and interface in a closed vessel A process and apparatus for determining the levels in a vessel of two or more immiscible or partially-miscible components has been developed. The process begins with transmitting gamma rays, x-rays, microwaves, ultrasound waves, or sonar waves through the... | 08/15/2000 |
| 6099619 | Purification of carbon dioxide Industrial grade carbon dioxide may contain unacceptable amounts of sulfur-containing materials, oxygen, and organic materials particularly detrimental to food-related uses of carbon dioxide. These can be effectively removed by a bed of silver-exchanged f... | 08/08/2000 |
| 6096934 | Oxidative coupling of methane with carbon conservation A process for converting methane to ethane and ethylene through oxidative coupling of methane and carbon conservation has been developed. The process begins by contacting methane and an oxygen-containing stream with an oxidative coupling catalyst that is ... | 08/01/2000 |
| 6074460 | Analysis of volatile organic compounds in water and air using attapulgite clays The purge and trap procedure commonly used for analysis of volatile organic compounds in water or air can be significantly improved using traps employing clays and modified clays as adsorbents. Examples of clays include attapulgite clay, attapulgite clay ... | 06/13/2000 |
| 6069284 | Process for separating diisopropyl ether from isopropyl alcohol and water A process to separate diisopropyl ether from a mixture of diisopropyl ether, isopropyl alcohol, and water has been developed. The process begins with distilling, in a distillation column, the mixture into a bottoms stream containing water and isopropyl al... | 05/30/2000 |
