Patents Represented by Attorney Michael Leach
  • Patent number: 4447662
    Abstract: Aromatic hydrocarbons are nitrated by reacting the aromatic hydrocarbon in a nitrogen tetroxide-containing liquid reaction medium, in the presence of a beta-dicarbonyl compound having a "W" configuration with a carbonyl group at each apex of the "W", preferably at a pressure and temperature sufficient to maintain the nitrogen tetroxide in the liquid state. Addition of an inert organic co-solvent to the liquid nitrogen tetroxide for the metal acetylacetonate promoted nitration of benzene essentially eliminates the production of dinitrobenzenes.
    Type: Grant
    Filed: June 10, 1982
    Date of Patent: May 8, 1984
    Assignee: Air Products and Chemicals, Inc.
    Inventors: David S. Ross, Robert M. Johnson, Jr., Ripudaman Malhotra
  • Patent number: 4440830
    Abstract: Polyvinyl alcohol based release coating compositions for strippable substrates which are in contact with pressure sensitive adhesives are disclosed. Substrates coated with the release compositions are easily peeled from pressure sensitive adhesive coated substrates without substantially adversely affecting the adhesive character of the adhesive coated substrate. The release coating composition comprises polyvinyl alcohol, a migratable release promoting agent, a water soluble salt of a coordinating metal and a water soluble boron compound in an aqueous solution. In addition to composites comprising release coated substrates affixed to adhesive coated substrates, the release compositions can be applied to the backing of a pressure sensitive adhesive tape to permit facile uncoiling of the rolled tape product.
    Type: Grant
    Filed: October 28, 1982
    Date of Patent: April 3, 1984
    Inventor: Lawrence K. Wempe
  • Patent number: 4436836
    Abstract: An alkylaromatic hydrocarbon feed stream is hydrodealkylate in the presence of a catalyst having a reduced rate of deactivation, or a lower coking tendency. The catalyst comprises a gamma-alumina support containing 8 to 12 wt % Cr.sub.2 O.sub.3 and 0.2 to 0.7 wt % Na.sub.2 O and having a surface area from 175 to 275 m.sup.2 /g and a pore volume from 0.5 to 1.2 cc/g. The catalyst is also useful in the hydrodesulfurization of thiophene containing hydrocarbon streams.
    Type: Grant
    Filed: July 6, 1982
    Date of Patent: March 13, 1984
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Francis P. Daly, Frederick C. Wilhelm
  • Patent number: 4436696
    Abstract: A process for high temperature sintering of ferrous powder metallurgy compacts having a substantially uniform carbon distribution which comprises:(a) heating the ferrous powder metallurgy compact in the heating zone of a sintering furnace to a temperature of about 2,300.degree. to 2,550.degree. F. (1,260.degree. to 1,399.degree. C.),(b) introducing to the heating zone an atmosphere comprising about 2 to less than 10 volume percent hydrogen, about 0.5 to 2.0 volume percent carbon monoxide, about 0.5 to 1.0 volume percent methane and the balance nitrogen, and(c) removing the sintered product from the furnace.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: March 13, 1984
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Daniel M. Buck, Alan T. Sibley, John J. Kaiser
  • Patent number: 4434300
    Abstract: A process for improving the methanol conversion rate in the reaction of methanol and ammonia to produce methylamines which comprises effecting the reaction in the presence of a macroporous, highly acidic alumino-silicate catalyst. Macroporous H-chabazite-erionite is the preferred catalyst.
    Type: Grant
    Filed: September 13, 1982
    Date of Patent: February 28, 1984
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Michel Deeba, William J. Ambs, Robert N. Cochran
  • Patent number: 4430456
    Abstract: Amino and amido dialkyltin dicarboxylates and stannoxy carboxylates are prepared by first reacting an amine or amino alcohol with a dicarboxylic acid anhydride, followed by reaction of the resulting product with a dialkyltin oxide. The obtained compounds are useful as catalysts for promoting reaction of organic isocyanates with organic compounds having one or more active hydrogen-containing groups.
    Type: Grant
    Filed: September 16, 1982
    Date of Patent: February 7, 1984
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Ibrahim S. Bechara, Rocco L. Mascioli
  • Patent number: 4418214
    Abstract: In a process for the preparation of alkylamines which comprises contacting an alkanol feed having at least three carbon atoms with ammonia in the presence of a hydrogenation catalyst and hydrogen in a reaction zone to yield a product effluent stream, separating the product effluent stream into an alkylamine stream for distillation and a vent stream comprising hydrogen and hydrocarbon by-products, the method comprising(a) contacting the hydrogen and hydrocarbon by-products vent stream in an absorber with an alkanol which is the same as the alkanol feed to yield a hydrogen gas stream and an alkanol wash stream containing the hydrocarbons,(b) recycling the hydrogen gas stream to the reaction zone,(c) stripping the alkanol wash stream in a stripper to provide a hydrocarbon waste stream and a regenerated alkanol stream, and(d) recycling the regenerated alkanol stream to the reaction zone.
    Type: Grant
    Filed: October 18, 1982
    Date of Patent: November 29, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Michael G. Turcotte
  • Patent number: 4417080
    Abstract: Aromatic hydrocarbons are nitrated by reacting the aromatic hydrocarbon in a nitrogen tetroxide-containing liquid reaction medium, in the presence of a beta-dicarbonyl compound having a "W" configuration with a carbonyl group at each apex of the "W", such as a metal acetylacetonate, preferably at a pressure and temperature sufficient to maintain the nitrogen tetroxide in the liquid state. Addition of an inert organic co-solvent to the liquid nitrogen tetroxide for the metal acetylacetonate promoted nitration of benzene essentially eliminates the production of dinitrobenzenes.
    Type: Grant
    Filed: June 10, 1982
    Date of Patent: November 22, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventors: David S. Ross, Robert M. Johnson, Jr., Ripudaman Malhotra
  • Patent number: 4417074
    Abstract: A process for preparing allylic amines which comprises contacting an allylic alcohol with ammonia or a primary or secondary amine in the presence of an effective amount of a phosphorus containing substance at a temperature sufficient to effect a reaction between the allylic alcohol and the ammonia or organic amine to produce an allylic amine.
    Type: Grant
    Filed: October 22, 1981
    Date of Patent: November 22, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Randall J. Daughenbaugh, Dale D. Dixon
  • Patent number: 4400476
    Abstract: The addition of a small amount of a halogen compound, e.g. chloroethyl phosphate, in a process producing elastomeric polyurethane RIM parts using tertiary amines as the chief catalyst component results in scavenging the residual amines after the part has been cured by annealing. The parts from such a process can be coated with a wide variety of enamels having a high solids content and completely cured to result in a higher degree of adhesive between the coating and the part's surface than those parts from a process without the use of such a halogen.
    Type: Grant
    Filed: March 15, 1982
    Date of Patent: August 23, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Ibrahim S. Bechara, Rocco L. Mascioli
  • Patent number: 4399308
    Abstract: A process for selectively preparing predominantly non-cyclic polyalkylene polyamine compounds is disclosed wherein an alkylene polyamine compound is contacted with an alkanolamine compound in the presence of a catalytically effective amount of a Lewis acid halide substance at a temperature of from 200.degree. to 350.degree. C. under a pressure sufficient to maintain the reaction mixture essentially in liquid phase. The polyalkylene polyamine thus formed is recovered from the reaction mixture.
    Type: Grant
    Filed: April 28, 1981
    Date of Patent: August 16, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Michael E. Ford, Thomas A. Johnson
  • Patent number: 4398041
    Abstract: A process for converting a C.sub.1 -C.sub.4 alcohol to a non-equilibrium controlled distribution of mono-, di- and trialkylamines is disclosed. A mixture of the alcohol and ammonia is reacted in a first conversion reactor containing a shape selective catalyst to yield a first product stream comprising the mono- and disubstituted alkylamines and substantially no trisubstituted alkylamine. A predetermined fraction of the first product stream is removed and the remainder of the stream is reacted in a second conversion reactor containing a catalyst which yields a second product stream comprising an equilibrium controlled distribution of the mono-, di- and trisubstituted alkylamine. The fraction of the first product stream and the second product stream are combined to yield an alkylamines stream comprising a non-equilibrium controlled alkylamines distribution.
    Type: Grant
    Filed: January 29, 1982
    Date of Patent: August 9, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Robert N. Cochran, Michel Deeba
  • Patent number: 4394524
    Abstract: A process for preparing noncyclic polyalkylene polyamine compounds is disclosed wherein ammonia, an alkylene polyamine compound and an alkanolamine compound are reacted in the presence of an effective amount of a phosphorus-containing substance or a salt of a sulfur-containing substance or its corresponding acid at a temperature from about 200.degree. to 350.degree. C. under a pressure sufficient to maintain the reaction mixture essentially in liquid phase. The polyalkylene polyamines thus formed are recovered from the reaction mixture.
    Type: Grant
    Filed: August 31, 1981
    Date of Patent: July 19, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Michael E. Ford, Thomas A. Johnson
  • Patent number: 4393173
    Abstract: A composition of matter comprising (1) an N-methylol monomer of the following general formula: ##STR1## wherein R is hydrogen, lower alkyl (C.sub.1 -C.sub.4), isopropenyl, or phenyl and R.sub.1 is hydrogen or methyl, and (2) a polyalkoxylate substance having at least a portion of its structure represented by (alkylene oxide).sub.x, wherein x is an integer, the composition containing about x molecules of the N-methylol monomer per molecule of polyalkoxylated substance. Such N-methylol monomer/polyalkoxylated complexes are polymerized to yield ungelled cross-linkable N-methylol polymers. The N-methylol polymers are cross-linked in a controlled manner with polyvinyl alcohol.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: July 12, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Wiley E. Daniels, Dennis J. Nagy
  • Patent number: 4386183
    Abstract: Polyvinyl alcohol based release coating compositions for strippable substrates which are in contact with pressure sensitive adhesives are disclosed. Substrates coated with the release compositions are easily peeled from pressure sensitive adhesive coated substrates without substantially adversely affecting the adhesive character of the adhesive coated substrate. The release coating composition comprises polyvinyl alcohol, a migratable release promoting agent, a water soluble salt of a coordinating metal and a water soluble boron compound in an aqueous solution. In addition to composites comprising release coated substrates affixed to adhesive coated substrates, the release compositions can be applied to the backing of a pressure sensitive adhesive tape to permit facile uncoiling of the rolled tape product.
    Type: Grant
    Filed: April 16, 1981
    Date of Patent: May 31, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Lawrence K. Wempe
  • Patent number: 4376700
    Abstract: A new heavy liquid parting medium comprising an emulsion of water and a substantially water immiscible heavy parting liquid for use in beneficiating ores by gravity separations such as sink-float processes. The specific gravity of the emulsion parting medium can be adjusted by proportioning the relative amounts of water and the substantially water immiscible heavy liquid. As-mined coal is beneficiated using a water-trichlorofluoromethane emulsion as the parting medium in a sink-float separation process.
    Type: Grant
    Filed: October 7, 1980
    Date of Patent: March 15, 1983
    Assignee: Bethlehem Steel Corporation
    Inventor: Stanton D. Irons
  • Patent number: 4369128
    Abstract: A catalyst suitable for use in the synthesis of hydrogen peroxide from hydrogen and oxygen is prepared by bringing hydrogen and oxygen into contact with a liquid mixture comprising a fluorocarbon and/or halofluorocarbon and water containing bis(tri(pentafluorophenyl)phosphine) palladium dichloride. When the reaction mixture is allowed to stand the catalyst appears as a black film at the interface of the organic and aqueous phases. The black film is almost totally insoluble in aqueous hydrogen peroxide.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: January 18, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Fred Moseley, Paul N. Dyer
  • Patent number: 4367347
    Abstract: A method for preparing substantially pure 2,4-DNT isomer from its admixture with other DNT isomers which comprises contacting the isomer mixture with aqueous sulfuric acid at an elevated temperature, separating excess DNT isomer mixture from the sulfuric acid phase and cooling the sulfuric acid phase.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: January 4, 1983
    Assignee: Air Products and Chemicals, Inc.
    Inventor: John E. Sawicki
  • Patent number: 4341898
    Abstract: A process for the preparation of aromatic isocyanates from nitroalkanes. A nitromethyl aromatic compound of the general formula: ##STR1## wherein R and R.sub.1 represent hydrogen, halogen, a C.sub.1 -C.sub.5 alkyl radical, a C.sub.1 -C.sub.4 alkoxy radical, nitro, isocyanato, an alkoxycarbonylamino, or nitromethyl radical, with R and R.sub.1 being the same or different, is heated in the presence of an effective amount of a Lewis acid or Bronsted acid substance to effect a dehydrogenation-isomerization reaction to yield an aromatic isocyanate of the general formula: ##STR2## The product of the reaction may be recovered as the aromatic isocyanate or the alcohol adduct, a carbamate.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: July 27, 1982
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Barton Milligan, Robert K. Pinschmidt, Jr.
  • Patent number: 4312780
    Abstract: A method for the reactivation of aged chromia-alumina dehydrogenation catalyst which involves doping the aged catalyst with minor amounts of zinc oxide, preferrably in the range of about 0.35% zinc oxide to 1.35% zinc oxide on the catalyst. The zinc oxide is added to the aged catalyst preferrably by impregnation by immersion or spraying of a zinc nitrate solution, followed by drying and heat treating. Alternatively the zinc oxide addition can be accomplished by use of a volatile organic zinc compound added to the saturated feedstock and subsequent air regeneration of the catalyst in situ without removal of the catalyst from the reactor.
    Type: Grant
    Filed: September 15, 1980
    Date of Patent: January 26, 1982
    Assignee: Air Products and Chemicals, Inc.
    Inventors: William J. Ambs, Maurice M. Mitchell, Jr.