Patents by Inventor David R. Dyroff
David R. Dyroff 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: 6700028Abstract: Provided herein are processes for the dehydrogenation of hydrocarbons using new supported catalysts. A process according to the invention employs new catalysts that possess a unique pore size distribution which provides a favorable balance of selectivity, activity, and thermal stability. A process according to the invention includes regeneration of the new catalysts. Detergent range paraffins may be converted to monoolefins using the new catalysts with fewer unwanted by-products being formed during the dehydrogenation.Type: GrantFiled: May 7, 2002Date of Patent: March 2, 2004Assignee: Huntsman Petrochemical CorporationInventor: David R. Dyroff
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Publication number: 20020183580Abstract: Provided herein are processes for the dehydrogenation of hydrocarbons using new supported catalysts. A process according to the invention employs new catalysts that possess a unique pore size distribution which provides a favorable balance of selectivity, activity, and thermal stability. A process according to the invention includes regeneration of the new catalysts. Detergent range paraffins may be converted to monoolefins using the new catalysts with fewer unwanted by-products being formed during the dehydrogenation.Type: ApplicationFiled: May 7, 2002Publication date: December 5, 2002Applicant: Huntsman Petrochemical CorporationInventor: David R. Dyroff
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Patent number: 6417135Abstract: Provided herein are supported catalysts and processes useful in the dehydrogenation of hydrocarbons. Catalysts made according to the invention possess a unique pore size distribution which provides a favorable balance of selectivity, activity, and thermal stability. In a preferred form of the invention, catalysts made in accordance of the invention are regenerable. Detergent range paraffins may be converted to monoolefins using a catalyst and process provided by the invention.Type: GrantFiled: March 22, 2000Date of Patent: July 9, 2002Assignee: Huntsman Petrochemical CorporationInventor: David R. Dyroff
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Patent number: 5364959Abstract: There are disclosed novel, highly stable sulfone peroxycarboxylic acids useful in detergent compositions or alone as bleaching agents which are represented by the formula ##STR1## wherein A and B are organic moieties bonded to the sulfur atom by a carbon atom and one of A and B contains from 1 to 4 ##STR2## groups bonded to carbon atoms.Type: GrantFiled: September 14, 1992Date of Patent: November 15, 1994Assignee: Monsanto CompanyInventors: David R. Dyroff, Daniel P. Getman, Joan K. Glascock
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Patent number: 5324880Abstract: An improved process for dehydrogenation of detergent range normal paraffins contained in a hydrocarbon mixture to produce monoolefins is described. Improvements are obtained by operating over an entire catalyst operating cycle at an average added hydrogen to detergent range hydrocarbon ratio of from about 0.5 to about 1.9. The improved process is operated in a substantially adiabatic, plug flow reactor at a suitable catalyst bed inlet temperature not greater than about 450.degree. C. The process provides improved tolerance for initial excess catalyst bed activity, allowing desirable catalyst operating cycle lengths to be obtained with more favorable operating conditions.Type: GrantFiled: July 24, 1992Date of Patent: June 28, 1994Assignee: Monsanto CompanyInventor: David R. Dyroff
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Patent number: 5185485Abstract: There is disclosed an improved process for the production of linear alkylbenzene wherein monoolefins are reacted with benzene in a hydrogen fluoride catalyzed reaction followed by recovery of the alkylbenzene. An alumina treatment step is included which removes organic fluoride impurities in order to prevent release of hydrofluoric acid in downstream equipment. It has been discovered that the SO.sub.3 sulfonation color of the alkylbenzene is surprisingly improved by the use of a high selectivity basic alumina for this treatment.Type: GrantFiled: June 28, 1991Date of Patent: February 9, 1993Assignee: Monsanto CompanyInventors: David R. Dyroff, Prakasa R. Anantaneni
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Patent number: 5004558Abstract: There are disclosed novel, highly stable sulfone peroxycarboxylic acids useful in detergent compositions or alone as bleaching agents which are represented by the formula ##STR1## wherein A and B are organic moieties bonded to the sulfur atom by a carbon atom and one of A and B contains from 1 to 4 ##STR2## groups bonded to carbon atoms.Type: GrantFiled: December 8, 1988Date of Patent: April 2, 1991Assignee: Monsanto CompanyInventors: David R. Dyroff, Daniel P. Getman, Joan K. Glascock
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Patent number: 4824591Abstract: There are disclosed novel, highly stable sulfone peroxycarboxylic acids useful in detergent compositions alone or as bleaching agents which are represented by the formula ##STR1## wherein A and B are organic moieties bonded to the sulfur atom by a carbon atom and at least one of A and B containing at least one ##STR2## group bonded to a carbon atom.Type: GrantFiled: March 14, 1988Date of Patent: April 25, 1989Assignee: Monsanto CompanyInventors: David R. Dyroff, Daniel P. Getman, Joan K. Glascock
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Patent number: 4824997Abstract: A method of carbonylation of formaldehyde is disclosed. In the method, an aqueous formaldehyde concentrate comprising between about 60% by weight and about 85% by weight formaldehyde, carbon monoxide and sulfuric acid are brought together in the absence of an effective amount of added Group IB cocatalyst in a reaction zone under a carbon monoxide partial pressure in the reaction zone of not greater than about 1.72.times.10.sup.7 N/M.sup.2. A carbonylation reaction is thereby effected in which a carbonylation product is produced comprising at least about 2% by weight sulfuric acid and a mixture of compounds of the formula:HO(CH.sub.2 COO).sub.n Hwherein n is a positive integer of at least 1. Also disclosed is a method for preparation of an alkyl glycolate by esterification of the carbonylation reaction mixture.Type: GrantFiled: January 25, 1988Date of Patent: April 25, 1989Assignee: Monsanto CompanyInventors: Alistair MacFarlane, David R. Dyroff, Robert V. Brill
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Patent number: 4758369Abstract: There are disclosed novel, highly stable sulfone peroxycarboxylic acids useful in detergent compositions alone or as bleaching agents which are represented by the formula ##STR1## wherein A and B are organic moieties bonded to the sulfur atom by a carbon atom and at least one of A and B containing at least one ##STR2## group bonded to a carbon atom.Type: GrantFiled: September 17, 1987Date of Patent: July 19, 1988Assignee: Monsanto CompanyInventors: David R. Dyroff, Daniel P. Getman, Joan K. Glascock
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Patent number: 4600750Abstract: An improved process is provided for producing polymeric acetal carboxylate salts useful as detergent builders. The process comprises polymerization of an alkyl glyoxylate, optionally with one or more comonomers; addition of stabilizing endgroups; and saponification of the polymeric ester to produce the polymeric acetal carboxylate salts. Active yield is improved by reducing the number of polymer chains with unstable temporary endcaps entering the saponification step.Type: GrantFiled: August 27, 1985Date of Patent: July 15, 1986Assignee: Monsanto CompanyInventors: David R. Dyroff, Edward J. Burke, William Vanderlinde, Thomas W. Backes
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Patent number: 4587033Abstract: Solid phase compositions having improved storage stability comprising polymeric acetal carboxylates in intimate admixture with a basic additive and a method of producing such admixtures are disclosed. The compositions are useful as builders in detergent formulations.Type: GrantFiled: July 2, 1984Date of Patent: May 6, 1986Assignee: Monsanto CompanyInventors: David R. Dyroff, Yueting Chou
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Patent number: 4542206Abstract: Solid state compositions having improved storage stability are provided by reacting an aqueous solution or slurry of polymeric acetal carboxylate and alkali metal hydroxide with carbon dioxide to form alkali metal carbonate in intimate admixture with the polymer and recovering the admixture in solid form. The compositions are useful as builders in detergent formulations.Type: GrantFiled: July 2, 1984Date of Patent: September 17, 1985Assignee: Monsanto CompanyInventor: David R. Dyroff
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Patent number: 4502923Abstract: High purity alkyl glyoxylate is produced from complex mixtures containing alkyl glyoxylate, alkyl glycolate, water, alcohol and miscellaneous impurities. High purity alkyl glyoxylate is useful in the synthesis of alkyl glyoxylate polymers.Type: GrantFiled: October 6, 1983Date of Patent: March 5, 1985Assignee: Monsanto CompanyInventors: David R. Dyroff, Yueting Chou, Dario R. Cova
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Patent number: 4303777Abstract: A polymer having the average structure: ##STR1## wherein Y is a moiety containing 1 to about 20 carbon atoms randomly distributed along the polymer chain derived from a comonomer selected from the group consisting of aldehydes and epoxy compounds; p is 0 or 1; the product of q and n averages at least 4; R.sup.1 and R.sup.2 are individually any chemically stable group which stabilizes the polymer against rapid depolymerization in alkaline solution; and Z is a mixture of H and members selected from the group consisting of alkali metals, ammonium and alkanol amine groups having from 1 to about 4 carbon atoms, is useful for the reversible deflocculation of clay slurries. In the preferred embodiments, p is 0 to provide a homopolymer, the product of q and n averages between about 10 and about 200, and Z is a mixture containing at least 1 percent H, the remainder being alkali metal, e.g., sodium.Type: GrantFiled: June 5, 1980Date of Patent: December 1, 1981Assignee: Monsanto CompanyInventors: Marvin M. Crutchfield, David R. Dyroff
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Patent number: 4302564Abstract: The alkali metal, ammonium and alkanol amine salts of acetal carboxylate polymers are known to be stable detergent builders and chelating agents which depolymerize in acid media making the polymer fragments more readily biodegradable in waste streams. Now, according to the present invention, the hydrolytic stability of an acetal carboxylate polymer can be controlled by bringing together under polymerization conditions an ester of glyoxylic acid and a polymerization initiator and adding to the termini of the resulting polymer end groups having substituents which are selected to be more electron withdrawing as the desired hydrolytic stability increases.Type: GrantFiled: June 5, 1980Date of Patent: November 24, 1981Assignee: Monsanto CompanyInventors: David R. Dyroff, Gary J. Lynch, Victor D. Papanu
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Patent number: 4289753Abstract: Oral compositions such as mouth washes, toothpastes, other oral hygiene products, foods, beverages, chewing gums and the like containing certain bis(carboxyalkoxy)-butanedioic acid compounds inhibit dental calculus formation.Type: GrantFiled: April 4, 1977Date of Patent: September 15, 1981Assignee: Monsanto CompanyInventors: David R. Dyroff, Gary F. Graf, Keun Y. Kim, Walton F. Suchanek, Jr.
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Patent number: 4233422Abstract: The alkali metal, ammonium and alkanol amine salts of polymeric acetal carboxylates are stable detergent builders under laundry use conditions, but depolymerize in acid media, making the polymer fragments more readily biodegradable in waste streams. Now, in the improved process of the present invention for preparing an acetal carboxylate polymer wherein an ester of glyoxylic acid and a polymerization initiator are brought together under polymerization conditions and a chemically stable end group is added to the termini of the resulting polymer to stabilize the polymer against rapid depolymerization in alkaline solution, the improvement comprises adding to the resulting polymer a sufficient amount of an alkali metal hydride, preferably sodium hydride, and a dialkyl sulfate having 1 to about 20 carbon atoms in each alkyl group, preferably dimethyl sulfate, to add to the termini of the resulting polymer an alkyl group derived from the dialkyl sulfate.Type: GrantFiled: September 24, 1979Date of Patent: November 11, 1980Assignee: Monsanto CompanyInventors: David R. Dyroff, Gary J. Lynch
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Patent number: 4233423Abstract: The alkali metal, ammonium and alkanol amine salts of polymeric acetal carboxylates are stable detergent builders and chelating agents. Now, in the improved process of the present invention for preparing an acetal carboxylate polymer wherein a glyoxylate ester and a polymerization initiator are brought together under polymerization conditions and a chemically stable end group is added to the termini of the resulting polymer to stabilize the polymer against rapid depolymerization in alkaline solution, the improvement comprises contacting the resulting polymer in the presence of an acid catalyst with a sufficient amount of an acetal having 3 to 20 carbon atoms to stabilize the resulting polymer against rapid depolymerization in alkaline solution, and an agent to remove liberated alcohol.Type: GrantFiled: November 5, 1979Date of Patent: November 11, 1980Assignee: Monsanto CompanyInventors: David R. Dyroff, Gary J. Lynch, Victor D. Papanu
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Patent number: 4226959Abstract: The alkali metal, ammonium and alkanol ammonium salts of polymeric acetal carboxylates are stable detergent builders under laundry use conditions but depolymerize in acid media, making the polymer fragments more readily biodegradable in waste streams.Type: GrantFiled: October 22, 1979Date of Patent: October 7, 1980Assignee: Monsanto CompanyInventors: David R. Dyroff, Victor D. Papanu