Patents by Inventor Mark William Dassel
Mark William Dassel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20170297916Abstract: By incorporating an additional TCS and/or DCS redistribution reactor in the TCS recycle loop and/or DCS recycle loop, respectively, of a process and system for silane manufacture, efficiencies in the production of silane are realized. Further improvements in efficiencies may be realized by directing a portion of the product from a redistribution reactor into a distillation column, and specifically into the distillation column that formed the feedstock that went into the redistribution reactor.Type: ApplicationFiled: October 14, 2015Publication date: October 19, 2017Applicant: SiTec GmbHInventor: Mark William Dassel
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Patent number: 9718694Abstract: By incorporating an additional TCS and/or DCS redistribution reactor in the TCS recycle loop and/or DCS recycle loop, respectively, of a process and system for silane manufacture, efficiencies in the production of silane are realized.Type: GrantFiled: May 3, 2014Date of Patent: August 1, 2017Assignee: SiTec GmbHInventor: Mark William Dassel
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Publication number: 20170021319Abstract: Improved hydrochlorination reactors, which have a larger internal volume and hence functional capacity than presently available hydrochlorination reactors, may be prepared with reactor walls having inner and outer layers where each layer provides a unique benefit, the inner layer having hydrogen chloride resistance and the outer layer having high strength at elevated temperature and pressure. Alternatively, or additionally, hoops may be disposed along the outside of the reactor wall to provide additional strength to the reactor during operation. Specified materials may be used to form the reactor wall in order to provide both acid resistance and high strength at elevated operating temperatures.Type: ApplicationFiled: March 10, 2015Publication date: January 26, 2017Applicant: SiTec GmbHInventors: Mark William Dassel, Michael VanDeVanter
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Patent number: 9493360Abstract: A catalytic process for converting silicon tetrachloride (STC) into trichlorosilane (TCS) utilizes a metal catalyst such as metal silicide at a low temperature such as 500 C, where the STC is reacted with hydrogen gas in the presence of catalyst and under non-thermal equilibrium conditions, to provide for a product gas stream that includes TCS at levels exceeding those obtained at thermal equilibrium, as well as optionally including HCl and unreacted STC.Type: GrantFiled: November 10, 2012Date of Patent: November 15, 2016Assignee: SiTec GmbHInventor: Mark William Dassel
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Publication number: 20160090307Abstract: By incorporating an additional TCS and/or DCS redistribution reactor in the TCS recycle loop and/or DCS recycle loop, respectively, of a process and system for silane manufacture, efficiencies in the production of silane are realized.Type: ApplicationFiled: May 3, 2014Publication date: March 31, 2016Inventor: Mark William Dassel
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Publication number: 20160008784Abstract: Reactor design and operating conditions enabling adiabatic direct chlorination of metallurgic silicon by hydrogen chloride are presented. The exothermic heat of reaction is absorbed by cooling fluid in admixture with the reactants and products of the reaction, thereby eliminating the necessity of external cooling for the reactor. Reactor temperature is managed by controlling the temperature and composition of reactor feedstock. Feedstock comprises hydrogen, STC, TCS, HCl, and metallurgic silicon. Exemplary feedstock composition, flow-rates, and temperatures are provided. Alternate means of producing the feedstock are described, including a method whereby the feedstock is the product of an upstream STC converter.Type: ApplicationFiled: March 12, 2014Publication date: January 14, 2016Inventor: Mark William Dassel
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Publication number: 20150123038Abstract: A process that includes: (a) introducing a vent gas comprising hydrochloric acid, silicon tetrachloride, trichlorosilane, and dichlorosilane to an HCl converter reactor comprising a metal catalyst, to provide a product gas comprising less hydrochloric acid than was present in the vent gas; (b) refining the product gas to provide a hydrogen enriched stream and a chlorosilane(s) enriched stream, and (c) introducing the chlorosilane(s) enriched stream into a TCS/STC distillation unit, to generate a fraction enriched in silicon tetrachloride and another fraction enriched in trichlorosilane and dichlorosilane.Type: ApplicationFiled: April 26, 2013Publication date: May 7, 2015Inventor: Mark William Dassel
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Publication number: 20150030520Abstract: A process that includes combining hydrogen chloride, metallurgical grade silicon and a third gas, e.g., tetrachlorosilane, in a reactor, under reaction conditions that include a temperature of 250-400 C. and a pressure of 2-33 barg, for a time sufficient to convert metallurgical grade silicon to an exit gas that includes trichlorosilane.Type: ApplicationFiled: March 13, 2013Publication date: January 29, 2015Applicant: CENTROTHERM PHOTOVOLTAICS USA, INC.Inventor: Mark William Dassel
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Publication number: 20140322121Abstract: A catalytic process for converting silicon tetrachloride (STC) into trichlorosilane (TCS) utilizes a metal catalyst such as metal silicide at a low temperature such as 500C, where the STC is reacted with hydrogen gas in the presence of catalyst and under non-thermal equilibrium conditions, to provide for a product gas stream that includes TCS at levels exceeding those obtained at thermal equilibrium, as well as optionally including HCl and unreacted STC.Type: ApplicationFiled: November 10, 2012Publication date: October 30, 2014Inventor: Mark William Dassel
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Patent number: 6288270Abstract: Methods for controlling the reaction rate of a hydrocarbon to an acid by making phase-related adjustments are disclosed. In order to improve reaction rate of the oxidation, a single phase at the operating temperature is attained and maintained by adjusting one or more of gaseous oxidant flow rate, pressure in the reaction zone, temperature in the reaction zone, feed rate of hydrocarbon, feed rate of solvent, feed rate of water if water is being fed, feed rate of the catalyst. The preferred hydrocarbon is cyclohexane, the preferred acid is adipic acid, the preferred solvent is acetic acid, and the preferred catalyst is cobalt acetate. Other hydrocarbons include, but are not limited to, methylated benzene, methylated structures involving two benzene rings, and methylated naphthalene.Type: GrantFiled: March 6, 1997Date of Patent: September 11, 2001Assignee: RPC Inc.Inventors: Mark William Dassel, Eustathios Vassiliou, David Cole DeCoster, Ader Meherban Rostami, Sharon Marie Aldrich
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Patent number: 6156868Abstract: This invention relates to methods of preparing dibasic acids, such as adipic acid for example, by oxidizing a hydrocarbon with a gas containing an oxidant, preferably oxygen. A respective hydrocarbon is reacted with a gaseous oxidant to form dibasic acid in a mixture which preferably contains a solvent, a catalyst, and an initiator. The temperature of the mixture is then lowered to a point at which solid dibasic acid is precipitated, while maintaining a single liquid phase. At least part of the formed acid is then removed.Type: GrantFiled: May 13, 1999Date of Patent: December 5, 2000Assignee: RPC Inc.Inventors: Mark William Dassel, David Cole DeCoster, Ader Meherban Rostami, Sharon Marie Aldrich, Eustathios Vassiliou
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Patent number: 5939582Abstract: Methods and apparatuses for controlling exothermic reactions involving a first reactant contained in a liquid and a second reactant in a gas to form a reaction product by atomizing the liquid in an environment of a gas and removing heat of reaction by condensing vapors of the liquid in a reaction chamber. Preferably, the condensation takes place on a simultaneously atomized second liquid of lower temperature than the atomized liquid containing the first reactant. The compositions of the two liquids are preferably similar. This invention provides waste minimization and considerable environmental improvement.Type: GrantFiled: July 17, 1998Date of Patent: August 17, 1999Assignee: Twenty-First Century Research CorporationInventors: Mark William Dassel, Eustathios Vassiliou
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Patent number: 5922908Abstract: This invention relates to methods of preparing dibasic acids, such as adipic acid for example, by oxidizing a hydrocarbon with a gas containing an oxidant, preferably oxygen. A respective hydrocarbon is reacted with a gaseous oxidant to form dibasic acid in a mixture which preferably contains a solvent, a catalyst, and an initiator. The temperature of the mixture is then lowered to a point at which solid dibasic acid is precipitated, while maintaining a single liquid phase. At least part of the formed acid is then removed.Type: GrantFiled: March 27, 1997Date of Patent: July 13, 1999Assignee: Twenty-First Century Research CorporationInventors: Mark William Dassel, David Cole DeCoster, Ader Meherban Rostami, Sharon Marie Aldrich, Eustathios Vassiliou
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Patent number: 5883292Abstract: Methods and apparatuses for controlling exothermic reactions involving a first reactant contained in a liquid and a second reactant in a gas to form a reaction product by atomizing the liquid in an environment of a gas and removing heat of reaction by condensing vapors of the liquid in a reaction chamber. Preferably, the condensation takes place on a simultaneously atomized second liquid of lower temperature than the atomized liquid containing the first reactant. The compositions of the two liquids are preferably similar. This invention provides waste minimization and considerable environmental improvement.Type: GrantFiled: January 17, 1996Date of Patent: March 16, 1999Assignee: Twenty-First Century Research CorporationInventors: Mark William Dassel, Eustathios Vassiliou
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Patent number: 5801282Abstract: Methods of making intermediate oxidation products by atomizing a first liquid (in the form of droplets) containing a reactant into a gas containing an oxidant in a manner to form an intermediate oxidation product different than carbon monoxide and/or carbon dioxide. The oxidation is controlled by monitoring the pre-coalescing temperature (temperature of the droplets just before they coalesce into a mass of liquid), or transient temperature difference (difference between the pre-coalescing temperature and the temperature of the droplets just before atomized), or transient conversion (conversion taking place in the time interval between the formation of the droplets and their coalescence into a mass of liquid) or a combination thereof.Type: GrantFiled: June 7, 1995Date of Patent: September 1, 1998Assignee: Twenty-First Century Research CorporationInventors: Mark William Dassel, Eustathios Vassiliou
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Patent number: 5654475Abstract: Methods of making intermediate oxidation products by atomizing a first liquid (in the form of droplets) containing a reactant into a gas containing an oxidant in a manner to form an intermediate oxidation product different than carbon monoxide and/or carbon dioxide. The oxidation rate is controlled by monitoring and adjusting the temperatures and/or conversions at critical points of the process.Type: GrantFiled: March 25, 1996Date of Patent: August 5, 1997Assignee: Twenty-First Century Research CorporationInventors: Eustathios Vassiliou, Mark William Dassel