Patents by Inventor Mark A. Liepa
Mark A. Liepa 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: 9586881Abstract: Processes for producing propylene glycol monoalkyl ether are described herein and include contacting propylene oxide and an alcohol in the presence of an alkali or alkaline earth metal alkoxide catalyst to produce an alkoxylation mixture including propylene glycol monoalkyl ether; distilling the alkoxylation mixture to produce a first overhead stream including propylene oxide and the alcohol and a first bottoms stream including propylene glycol monoalkyl ether; distilling the first bottoms stream to produce a second overhead stream including purified propylene glycol monoalkyl ether and a second bottoms stream including heavier byproducts; further distilling the second bottoms stream to form a resulting bottoms stream including caustic and heavier byproducts; introducing an alkali metal borohydride into at least a portion of the resulting bottoms stream to form an alkali metal borohydride containing stream; and introducing the alkali metal borohydride containing stream into one or more distillations upstreamType: GrantFiled: October 12, 2015Date of Patent: March 7, 2017Assignee: Lyondell Chemical Technology, L.P.Inventors: Xiangmin Li, Lawrence M. Candela, Mark A. Liepa, David W. Leyshon
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Publication number: 20160031779Abstract: Processes for producing propylene glycol monoalkyl ether are described herein and include contacting propylene oxide and an alcohol in the presence of an alkali or alkaline earth metal alkoxide catalyst to produce an alkoxylation mixture including propylene glycol monoalkyl ether; distilling the alkoxylation mixture to produce a first overhead stream including propylene oxide and the alcohol and a first bottoms stream including propylene glycol monoalkyl ether; distilling the first bottoms stream to produce a second overhead stream including purified propylene glycol monoalkyl ether and a second bottoms stream including heavier byproducts; further distilling the second bottoms stream to form a resulting bottoms stream including caustic and heavier byproducts; introducing an alkali metal borohydride into at least a portion of the resulting bottoms stream to form an alkali metal borohydride containing stream; and introducing the alkali metal borohydride containing stream into one or more distillations upstreamType: ApplicationFiled: October 12, 2015Publication date: February 4, 2016Inventors: XIANGMIN LI, Lawrence M. Candela, Mark A. Liepa, David W. Leyshon
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Patent number: 9187392Abstract: The invention is a process for producing a propylene glycol monoalkyl ether which comprises first reacting propylene oxide and an alcohol in the presence of an alkali or alkaline earth metal alkoxide catalyst to produce an alkoxylation mixture comprising propylene glycol monoalkyl ether; distilling the alkoxylation mixture to produce a first overhead stream comprising propylene oxide and alcohol and a first bottoms stream comprising propylene glycol monoalkyl ether; and then distilling the first bottoms stream to produce purified propylene glycol monoalkyl ether as a second overhead stream. The reaction and/or one or more of the distillation steps occur in the presence of an alkali metal borohydride. The process produces propylene glycol monoalkyl ether with low UV absorbance and reduced carbonyl impurities.Type: GrantFiled: January 17, 2008Date of Patent: November 17, 2015Assignee: Lyondell Chemical Technology, L.P.Inventors: Xiangmin Li, Lawrence M. Candela, Mark A. Liepa
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Patent number: 7575604Abstract: A drycleaning method is disclosed. The method uses a composition comprising 30 to 90 wt. % of a dipropylene glycol C3-C4 alkyl ether, 5 to 65 wt. % of one or more C10-C15 hydrocarbons, and 1 to 10 wt. % of water. The method combines acceptable stain removal with faster-than-expected evaporability, particularly at the elevated temperatures used in commercial drycleaning.Type: GrantFiled: October 6, 2006Date of Patent: August 18, 2009Assignee: Lyondell Chemical Technology, L.P.Inventors: Paul E. Galick, Frank J. Liotta, Jr., Mark A. Liepa
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Publication number: 20090187049Abstract: The invention is a process for producing a propylene glycol monoalkyl ether which comprises first reacting propylene oxide and an alcohol in the presence of an alkali or alkaline earth metal alkoxide catalyst to produce an alkoxylation mixture comprising propylene glycol monoalkyl ether; distilling the alkoxylation mixture to produce a first overhead stream comprising propylene oxide and alcohol and a first bottoms stream comprising propylene glycol monoalkyl ether; and then distilling the first bottoms stream to produce purified propylene glycol monoalkyl ether as a second overhead stream. The reaction and/or one or more of the distillation steps occur in the presence of an alkali metal borohydride. The process produces propylene glycol monoalkyl ether with low UV absorbance and reduced carbonyl impurities.Type: ApplicationFiled: January 17, 2008Publication date: July 23, 2009Inventors: Xiangmin Li, Lawrence M. Candela, Mark A. Liepa
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Publication number: 20080083072Abstract: A drycleaning method is disclosed. The method uses a composition comprising 30 to 90 wt. % of a dipropylene glycol C3-C4 alkyl ether, 5 to 65 wt. % of one or more C10-C15 hydrocarbons, and 1 to 10 wt. % of water. The method combines acceptable stain removal with faster-than-expected evaporability, particularly at the elevated temperatures used in commercial drycleaning.Type: ApplicationFiled: October 6, 2006Publication date: April 10, 2008Inventors: Paul E. Galick, Frank J. Liotta, Mark A. Liepa
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Publication number: 20040124140Abstract: Reduced attrition of catalyst and extended operation of heterogenous catalyzed slurry reactions in draught tube reactors is facilitated by locating vertically oriented filter media within the draught tube reactor annular space to provide a product outlet stream substantially free of catalyst.Type: ApplicationFiled: December 30, 2002Publication date: July 1, 2004Inventors: Gary A. Sawyer, Mark A. Liepa, Prakash G. Balan
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Patent number: 6710194Abstract: Propylene oxide is produced by liquid phase reaction of propylene oxygen and hydrogen in contact with a solid epoxidation catalyst at elevated temperature and pressure, the reaction conditions being regulated to provide a weight ratio of dissolved oxygen to dissolved hydrogen in the liquid reaction mixture of at least 16.Type: GrantFiled: January 23, 2003Date of Patent: March 23, 2004Assignee: ARCO Chemical Technology, L.P.Inventors: Robert N. Cochran, Prakash G. Balan, Mark A. Liepa, Bernard Cooker
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Patent number: 6563010Abstract: The process for removing impurities from a liquid by contact with a solid adsorbent using parallel contact adsorbent beds such that when one bed is contacting the liquid the parallel bed is being regenerated by contact with heated inert gas, wherein during changeover of the beds inert gas is transferred from the regenerated bed to the spent bed during the period that liquid is being drained from the spent bed.Type: GrantFiled: June 3, 2002Date of Patent: May 13, 2003Assignee: ARCO Chemical Technology, L.P.Inventor: Mark A. Liepa
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Patent number: 5973171Abstract: An integrated process is provided for the production of propylene oxide from propane wherein propane is dehydrogenated to propylene and hydrogen and the resulting propylene, propane, and hydrogen mixture together with added oxygen is reacted over a palladium on titanium silicilite catalyst to form propylene oxide, the molar ratio of oxygen to hydrogen in the reaction feed being at least about 2/1.Type: GrantFiled: October 7, 1998Date of Patent: October 26, 1999Assignee: ARCO Chemical Technology, LPInventors: Robert N. Cochran, John C. Jubin, Jr., Mark A. Liepa, Robert Nedwick, Rangasamy Pitchai, W. Wayne Wentzheimer
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Patent number: 5565581Abstract: The present invention relates to the epoxidation of olefins using cyclohexyl hydroperoxide as reactant, the improvement being using a secondary or tertiary alcohol such as cyclohexanol or tertiary butyl alcohol as a stabilizing agent during the epoxidation, the alcohol stabilizer being fed to the epoxidation reaction zone in an amount greater than 3 moles per mole of hydroperoxide fed to the epoxidation reaction zone.Type: GrantFiled: October 18, 1990Date of Patent: October 15, 1996Assignee: ARCO Chemical Technology, L.P.Inventor: Mark A. Liepa