Patents by Inventor Thomas Z. Srnak
Thomas Z. Srnak 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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Patent number: 11612881Abstract: A process for preparing a silver-containing catalyst for the oxidation of ethylene to ethylene oxide (EO) including the steps of: providing a support having pores; providing a silver-containing impregnation solution; adding an amount of surfactant to the impregnation solution; contacting the support with the surfactant-containing impregnation solution; and removing at least a portion of the impregnation solution prior to fixing the silver upon the carrier in a manner which preferentially removes impregnation solution not contained in the pores. The use of the surfactant results in improved drainage of the silver impregnation solution from the carrier exteriors during the catalyst synthesis. As a result, the amount of silver-containing impregnation solution necessary for the synthesis of the EO catalyst was reduced by up to 15% without reducing the catalyst performance.Type: GrantFiled: November 30, 2018Date of Patent: March 28, 2023Assignee: Dow Technology Investments LLCInventors: Daniel Grohol, Thomas Z. Srnak, Cathy L. Tway, George L. Athens, Kyle R. Essenmacher, Gary M. Seabolt, Tim D. Munro
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Publication number: 20210178367Abstract: A process for preparing a silver-containing catalyst for the oxidation of ethylene to ethylene oxide (EO) including the steps of: providing a support having pores; providing a silver-containing impregnation solution; adding an amount of surfactant to the impregnation solution; contacting the support with the surfactant-containing impregnation solution; and removing at least a portion of the impregnation solution prior to fixing the silver upon the carrier in a manner which preferentially removes impregnation solution not contained in the pores. The use of the surfactant results in improved drainage of the silver impregnation solution from the carrier exteriors during the catalyst synthesis. As a result, the amount of silver-containing impregnation solution necessary for the synthesis of the EO catalyst was reduced by up to 15% without reducing the catalyst performance.Type: ApplicationFiled: November 30, 2018Publication date: June 17, 2021Inventors: Daniel Grohol, Thomas Z. Srnak, Cathy L. Tway, George L. Athens, Kyle R. Essenmacher, Gary M. Seabolt, Tim D. Munro
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Patent number: 9353044Abstract: The invention provides a method for the reductive amination of diethanolamine to form a product composition that includes piperazine (PIP) and aminoethylethanolamine (AEEA). A catalyst with a transitional alumina/second metal oxide support and a mixture of catalytic metals is used for the reaction which results in low levels of non-PIP and non-AEEA side products.Type: GrantFiled: November 14, 2012Date of Patent: May 31, 2016Assignee: Dow Global Technologies, LLCInventors: Stephen W. King, Sadeka Onam, Thomas Z. Srnak
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Publication number: 20140371452Abstract: The invention provides a method for the reductive amination of diethanolamine to form a product composition that includes piperazine (PIP) and aminoethylethanolamine (AEEA). A catalyst with a transitional alumina/second metal oxide support and a mixture of catalytic metals is used for the reaction which results in low levels of non-PIP and non-AEEA side products.Type: ApplicationFiled: November 14, 2012Publication date: December 18, 2014Inventors: Stephen W. King, Sadeka Onam, Thomas Z. Srnak
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Patent number: 8618108Abstract: The present invention provides strategies for making cyclic triamines. Reactant media including certain precursors and/or certain types of catalysts can be converted into cyclic triamines with improved conversion and selectivity. The strategies can be incorporated into reactions that involve transamination schemes and/or reductive amination schemes. In the case of transamination, for instance, using transamination to cause ring closure of higher amines in the presence of a suitable catalyst leads to desired cyclic triamines with notable conversion and yield. In the case of reductive amination, reacting suitable polyfunctional precursors in the presence of a suitable catalyst also yields cyclic triamines via ring closure with notable selectivity and conversion. Both transamination and reductive amination methodologies can be practiced under much milder temperatures than are used when solely acid catalysts are used. Preferred embodiments can produce reaction mixtures that are generally free of salt by-products.Type: GrantFiled: October 6, 2009Date of Patent: December 31, 2013Assignee: Union Carbide Chemicals & Plastics Technology LLCInventors: Stephen W. King, Stefan K. Mierau, Thomas Z. Srnak
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Patent number: 8383861Abstract: The present invention relates to processes for the manufacture of one or more ethanolamines and one or more ethyleneamines starting from the reaction of ethylene oxide with ammonia to produce one or more ethanolamines and the conversion of the ethanolamine(s) to ethyleneamine(s). The present invention also relates to separating alkylethyleneamines from ethyleneamines.Type: GrantFiled: October 6, 2009Date of Patent: February 26, 2013Assignee: Dow Global Technologies LLCInventors: David Do, Christopher H. Domke, Jacinto Lopez-Toledo, David M. Petraitis, Thomas Z. Srnak
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Patent number: 8273884Abstract: The present invention provides strategies for making cyclic triamines. Reactant media including certain precursors and/or certain types of catalysts can be converted into cyclic triamines with improved conversion and selectivity. The strategies can be incorporated into reactions that involve transamination schemes and/or reductive amination schemes. In the case of transamination, for instance, using transamination to cause ring closure of higher amines in the presence of a suitable catalyst leads to desired cyclic triamines with notable conversion and yield. In the case of reductive amination, reacting suitable polyfunctional precursors in the presence of a suitable catalyst also yields cyclic triamines via ring closure with notable selectivity and conversion. Both transamination and reductive amination methodologies can be practiced under much milder temperatures than are used when solely acid catalysts are used. Preferred embodiments can produce reaction mixtures that are generally free of salt by-products.Type: GrantFiled: October 6, 2009Date of Patent: September 25, 2012Assignee: Union Carbide Chemicals & Plastics Technology LLCInventors: Stephen W. King, Thomas Z. Srnak, Stefan K. Mierau
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Patent number: 8188318Abstract: The present invention provides methods of manufacturing ethyleneamines that makes use of an ethyleneamine-generating process that is coupled to a transamination process. The combination of an ethyleneamine-generating process with a transamination process improves the mix flexibility that can be obtained from the single process allowing the production of ethyleneamine compositions having an improved and more desirable product mix.Type: GrantFiled: October 6, 2009Date of Patent: May 29, 2012Assignee: Union Carbide Chemicals & Plastics Technology LLCInventors: David M. Petraitis, Stephen W. King, Thomas Z. Srnak
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Publication number: 20100094008Abstract: The present invention provides strategies for making cyclic triamines. Reactant media including certain precursors and/or certain types of catalysts can be converted into cyclic triamines with improved conversion and selectivity. The strategies can be incorporated into reactions that involve transamination schemes and/or reductive amination schemes. In the case of transamination, for instance, using transamination to cause ring closure of higher amines in the presence of a suitable catalyst leads to desired cyclic triamines with notable conversion and yield. In the case of reductive amination, reacting suitable polyfunctional precursors in the presence of a suitable catalyst also yields cyclic triamines via ring closure with notable selectivity and conversion. Both transamination and reductive amination methodologies can be practiced under much milder temperatures than are used when solely acid catalysts are used. Preferred embodiments can produce reaction mixtures that are generally free of salt by-products.Type: ApplicationFiled: October 6, 2009Publication date: April 15, 2010Inventors: Stephen W. King, Thomas Z. Srnak, Stefan K. Mierau
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Publication number: 20100094007Abstract: The present invention provides strategies for making cyclic triamines. Reactant media including certain precursors and/or certain types of catalysts can be converted into cyclic triamines with improved conversion and selectivity. The strategies can be incorporated into reactions that involve transamination schemes and/or reductive amination schemes. In the case of transamination, for instance, using transamination to cause ring closure of higher amines in the presence of a suitable catalyst leads to desired cyclic triamines with notable conversion and yield. In the case of reductive amination, reacting suitable polyfunctional precursors in the presence of a suitable catalyst also yields cyclic triamines via ring closure with notable selectivity and conversion. Both transamination and reductive amination methodologies can be practiced under much milder temperatures than are used when solely acid catalysts are used. Preferred embodiments can produce reaction mixtures that are generally free of salt by-products.Type: ApplicationFiled: October 6, 2009Publication date: April 15, 2010Inventors: Stephen W. King, Thomas Z. Srnak, Stefan K. Mierau
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Publication number: 20100087684Abstract: The present invention relates to processes for the manufacture of one or more ethanolamines and one or more ethyleneamines starting from the reaction of ethylene oxide with ammonia to produce one or more ethanolamines and the conversion of the ethanolamine(s) to ethyleneamine(s). The present invention also relates to separating alkylethyleneamines from ethyleneamines.Type: ApplicationFiled: October 6, 2009Publication date: April 8, 2010Inventors: David Do, Christopher H. Domke, Jacinto Lopez-Toledo, David M. Petraitis, Thomas Z. Srnak