Patents by Inventor John C. Prindle
John C. Prindle 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: 9796656Abstract: A method of producing high purity dimethyl carbonate through the reaction of carbon dioxide and methanol is provided. In the ammonia-based method ammonia and carbon dioxide react to produce urea. The urea is mixed with methanol for further reaction to produce dimethyl carbonate. Ammonia released in the process is recycled as a reactant to produce more urea. It is then reacted with methanol to produce dimethyl carbonate. An integrated reactive distillation process using side reactors is used for facilitating catalytic reaction in the method for producing high purity dimethyl carbonate. The process is further enhanced by enclosing multiple side reactors into a pressure vessel and incorporating thermal heat pump for recovery and reuse of latent heat within the process.Type: GrantFiled: November 8, 2016Date of Patent: October 24, 2017Assignee: E3TEC Service, LLCInventors: Chandrakant B. Panchal, John C. Prindle
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Patent number: 9518003Abstract: Two methods of producing high purity dimethyl carbonate through the reaction of carbon dioxide and methanol are provided. In the ammonia-based method ammonia and carbon dioxide react to produce urea. The urea is mixed with methanol for further reaction to produce dimethyl carbonate. Ammonia released in the process is recycled as a reactant to produce more urea. In the ethylene-oxide process carbon dioxide reacts with ethylene oxide to produce ethylene carbonate. It is then reacted with methanol to produce dimethyl carbonate with ethylene glycol as byproduct. An integrated reactive distillation process using side reactors is used for facilitating catalytic reaction in these two methods for producing high purity dimethyl carbonate. The process is further enhanced by enclosing multiple side reactors into a pressure vessel and incorporating thermal heat pump for recovery and reuse of latent heat within the process.Type: GrantFiled: July 29, 2014Date of Patent: December 13, 2016Assignee: E3TEC Service, LLCInventors: Chandrakant B. Panchal, John C. Prindle
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Patent number: 9174920Abstract: An integrated process and system for synthesis of organic-acid esters is provided. The method of synthesizing combines reaction and distillation where an organic acid and alcohol composition are passed through a distillation chamber having a plurality of zones. Side reactors are used for drawing off portions of the composition and then recycling them to the distillation column for further purification. Water is removed from a pre-reactor prior to insertion into the distillation column. An integrated heat integration system is contained within the distillation column for further purification and optimizing efficiency in the obtaining of the final product.Type: GrantFiled: October 17, 2014Date of Patent: November 3, 2015Assignees: E3TEC Service, LLC, Board of Trustees of Michigan State UniversityInventors: Chandrakant B. Panchal, John C. Prindle, Aspi Kolah, Dennis J. Miller, Carl T. Lira
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Publication number: 20080097132Abstract: This invention provides a process for forming monomers from a dimer, wherein the dimer is dicyclopentadiene, di(methylcyclopentadiene), di(ethyleyclopentadiene), or a mixture of any two or more of these. The process comprises i) heating a liquid mixture comprising at least one dimer and at least one liquefying agent in a vaporization zone to at least the vaporization temperature of said mixture to form a vaporized mixture, wherein the vaporization zone consists essentially of a substantially straight conduit in which said liquid mixture occupies less than the entire cross sectional area of said conduit; and ii) introducing at least a portion of the vaporized mixture from i) into a cracking zone such that monomers are formed. This process is conducted at about atmospheric pressure.Type: ApplicationFiled: June 30, 2004Publication date: April 24, 2008Applicant: ALBEMARLE CORPORATIONInventors: John C. Prindle Jr, Dru J. Manuel
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Patent number: 6677265Abstract: The process features concurrent feeds into the liquid phase of a prepolymerization reaction mixture. These feeds are: a) separate continuous or substantially continuous feeds of (i) a polymerizable vinylolefin, and (ii) a solution in an organic liquid solvent of a metallocene and an aluminoxane and/or metallocene-aluminoxane reaction product; or b) separate continuous or substantially continuous feeds of (i) a polymerizable vinylolefin, (iii) a metallocene optionally in an organic liquid solvent or diluent, and (iv) an aluminoxane optionally in an organic liquid solvent or diluent; or c) separate continuous or substantially continuous feeds of (i) and (ii) and at least one of (iii) and (iv). Particles of catalytically-active, prepolymerized, self-supported olefin polymerization catalyst composition are formed in the reaction medium. The metallocene used as the feed or in making up the feed has at least one polymerizable olefinic substituent in the molecule.Type: GrantFiled: June 16, 2000Date of Patent: January 13, 2004Assignee: Albemarle CorporationInventors: Brian Kneale, James E. Boone, Steven P. Diefenbach, Cecil P. Loechelt, John C. Prindle, Jr.
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Patent number: 6509434Abstract: Mixtures of isomeric alkylthiated mononuclear aromatic amines comprising in the range of about 30 to about 70 mole percent of (i) at least one 3,5-di(alkyl-thio)-2,6-diamino-1-alkylbenzene and in the range of about 30 to about 70 mole percent of at least one 3,5-di(alkylthio)-2,4-diamino-1-alkylbenzene, such mixture containing at least about 90 mole percent of (i) and (ii), and optionally containing up to 10 mole percent of one or more isomers of (i) and/or (ii). An alkyl group may be present as a substituent in lieu of a hydrogen atom in the remaining ring position. These mixtures are useful as curatives or extenders in processes for making polyurethanes, polyurethane-ureas, and polyureas.Type: GrantFiled: March 20, 2000Date of Patent: January 21, 2003Assignee: Albemarle CorporationInventors: William R. Brown, John C. Prindle, Jr., Gregory H. Lambeth
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Patent number: 6469212Abstract: A mixture comprised of about 60-85% of 2,4-toluenediamine (2,4-TDA) and about 15-40% of 2,6-toluenediamine (2,6-TDA) is melted, the temperature of the mixture is lowered to a 2,4-TDA nucleation temperature, and the temperature of the mixture is gradually reduced from the nucleation temperature to about 65 to about 70° C. The resultant mixture is in the form of a solids phase enriched in 2,4-TDA, and a novel and useful liquid phase enriched in 2,6-TDA. These phases are separated. Preferably the solids are further purified by “sweating” them and removing the sweated liquid impurities. The sweated liquid can be recycled together with another charge of a mixture comprised of 2,4-TDA and 2,6-TDA. 2,4-TDA can be produced with a purity of 96-99%.Type: GrantFiled: March 20, 2000Date of Patent: October 22, 2002Assignee: Albemarle CorporationInventors: John C. Prindle, Jr., Michael W. Easson, James Dee Palmer, Jason G. Jones, Max K. Mortensen, James E. Boone
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Patent number: 6198003Abstract: A highly efficient method of producing alkyl mercaptan and/or dialkyl monosulfides which involves employing carbon dioxide as an internal coolant is described. Only negligible amounts of carbonyl sulfide were formed. In addition, relatively easy separation of carbon dioxide from the reaction mixture facilitates an efficient coolant recycle process, giving a simple and effective mode of temperature control.Type: GrantFiled: April 20, 1999Date of Patent: March 6, 2001Assignee: Albemarle CorporationInventors: Kaung-Far Lin, James E. Boone, Michael D. Matthews, John C. Prindle, Jr., Sharon D. Booth McGee
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Patent number: 5811470Abstract: Compositions and methods are described wherein a styrenic polymer is rendered flame retardant by incorporation therein before, during or after its formation, a combination of (a) at least one organic phosphorus additive that (i) is halogen-free, and (ii) is composed solely of carbon, hydrogen, and phosphorus, and optionally and preferably one or more of the elements nitrogen, oxygen, and sulfur; and (b) elemental sulfur; in proportions such that (i) the sulfur content from b) is less than 2 percent by weight of the weight of the styrenic polymer plus the weight of a) and b), and (ii) the styrenic polymer plus ingredients a) and b) can provide test specimens which exhibit an LOI of at least 24 if tested in accordance with ASTM Standard Test Method D 2863-87.Type: GrantFiled: August 27, 1997Date of Patent: September 22, 1998Assignee: Albemarle CorporationInventors: John C. Prindle, Jr., Christopher J. Nalepa, Govindarajulu Kumar