Patents Represented by Attorney Donald R. Cassady
  • Patent number: 5958836
    Abstract: The present invention relates to a method for the prevention of growth of algae by incorporating within liquids or coating on surfaces certain substituted amino alcohols. More precisely, this invention provides for algistat end uses for amino alcohol compounds endowed with chain extension which have the general formula: ##STR1## wherein n is 1-1000; and R.sub.1 =R.sub.2, and R.sub.1 and R.sub.2 are from the croup consisting of --CH.sub.2 --CH.sub.2 --; --CH.sub.2 --C(CH.sub.3)H--; and --C(CH.sub.3)H--CH.sub.2 --; R.sub.3, and R.sub.4 are each independently selected from the group consisting of H, --CH.sub.3, --CH.sub.2 CH.sub.3, --CH.sub.2 OH, and --CH.sub.2 --CH.sub.2 --OH; and the diasteromeric salts thereof.
    Type: Grant
    Filed: September 26, 1998
    Date of Patent: September 28, 1999
    Assignee: TriQuest, LP
    Inventors: Elmer Rauckman, Michael T. Sheehan, William W. Wilkison
  • Patent number: 5854171
    Abstract: A catalyst particularly useful in the preparation of unsaturated esters such as the reaction of ethylene, oxygen and acetic acid in a vapor phase to form vinyl acetate. The catalyst comprises a honeycomb carrier coated with silica and containing palladium and gold throughout the silica coat. Such catalysts show reduced pressure drop and a high space time yield for vinyl acetate.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: December 29, 1998
    Assignee: Celanese International Corporation
    Inventors: Ioan Nicolau, Philip M. Colling, Leland R. Johnson
  • Patent number: 5789624
    Abstract: Hydroformylation of alkenes to aldehydes in the presence of a rhodium complex catalyst is improved by the addition of a novel bidentate ligand of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.1 ' and R.sub.2 ' are organic radicals selected from alicyclic, aliphatic and aromatic groups of which at least one is preferably substituted with at least one electronegative moiety and the methylene groups are present at the trans-2,3 positions on the norbomane moiety. The invention also provides a novel method for producing the bidentate ligand and novel intermediate phosphine oxide and phosphinous acid compounds.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: August 4, 1998
    Assignee: Hoechst Celanese Corporation
    Inventors: Jerry D. Unruh, Brigitte E. Segmuller, Gabriel R. Chapa, Kent E. Pryor
  • Patent number: 5773661
    Abstract: Hydroformylation of alkenes to aldehydes in the presence of a rhodium complex catalyst is improved by the addition of a novel bidentate ligand of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.1 ' and R.sub.2 ' are organic radicals selected from alicyclic, aliphatic and aromatic groups of which at least one is preferably substituted with at least one electronegative moiety and the methylene groups are present at the trans-2,3 positions on the norbornane moiety. The invention also provides a novel method for producing the bidentate ligand and novel intermediate phosphine oxide and phosphinous acid compounds.
    Type: Grant
    Filed: September 2, 1997
    Date of Patent: June 30, 1998
    Assignee: Celanese International Corporation
    Inventors: Jerry D. Unruh, Brigitte E. Segmuller, Gabriel R. Chapa, Kent E. Pryor
  • Patent number: 5763608
    Abstract: The present invention provides a process for preparing a 5,6-dihydro-3H-pyrimidin-4-one derivatives which comprises the steps of (a) dehydrating a N-acyl beta amino acid in the presence of a dehydration agent and an organic solvent for a sufficient period of time and under suitable temperature and pressure conditions to form an oxazone (b) adding a carboxylic acid and a primary amine salt of a carboxylic acid to said oxazone to form a mixture, (c) distilling azeotropically said mixture for a suitable period of time and under suitable temperature and pressure conditions to substantially remove said dehydration agent and said organic solvent, and (d) heating the product of step (c) for a sufficient period of time and under suitable temperature and pressure conditions to form said pyrimidin derivatives.
    Type: Grant
    Filed: February 5, 1996
    Date of Patent: June 9, 1998
    Assignee: Hoechst Celanese Corporation
    Inventors: Apurba Bhattacharya, Diane E. Allen
  • Patent number: 5710338
    Abstract: Hydroformylation of alkenes to aldehydes in the presence of a rhodium complex catalyst is improved by the addition of a novel bidentate ligand of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.1 ' and R.sub.2 ' are organic radicals selected from alicyclic, aliphatic and aromatic groups of which at least one is preferably substituted with at least one electronegative moiety and the methylene groups are present at the trans-2,3 positions on the norbornane moiety. The invention also provides a novel method for producing the bidentate ligand and novel intermediate phosphine oxide and phosphinous acid compounds.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: January 20, 1998
    Assignee: Hoechst Celanese Corporation
    Inventors: Jerry D. Unruh, Brigitte E. Segmuller, Gabriel R. Chapa, Kent E. Pryor
  • Patent number: 5710337
    Abstract: Hydroformylation of alkenes to aldehydes in the presence of a rhodium complex catalyst is improved by the addition of a novel bidentate ligand of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.1 ' and R.sub.2 ' are organic radicals selected from alicyclic, aliphatic and aromatic groups of which at least one is preferably substituted with at least one electronegative moiety and the methylene groups are present at the trans-2,3 positions on the norbornane moiety. The invention also provides a novel method for producing the bidentate ligand and novel intermediate phosphine oxide and phosphinous acid compounds.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: January 20, 1998
    Assignee: Hoechst Celanese Corporation
    Inventors: Jerry D. Unruh, Brigitte E. Segmuller, Gabriel R. Chapa, Kent E. Pryor
  • Patent number: 5705679
    Abstract: A catalyst particularly useful in the preparation of unsaturated esters such as the reaction of ethylene, oxygen and acetic acid in a vapor phase to form vinyl acetate. The catalyst comprises a honeycomb carrier coated with silica and containing palladium and gold throughout the silica coat. Such catalysts show reduced pressure drop and a high space time yield for vinyl acetate.
    Type: Grant
    Filed: April 2, 1996
    Date of Patent: January 6, 1998
    Inventors: Ioan Nicolau, Philip M. Colling, Leland R. Johnson
  • Patent number: 5700753
    Abstract: This invention provides a heterogeneous bimetallic palladium-gold catalyst for vinyl acetate production from ethylene, acetic acid and oxygen. An invention catalyst is prepared by forming a first shell dispersion coating of colloidal palladium on the catalyst support surface, and super-imposing a second shell dispersion coating of colloidal gold metal on the catalyst support surface. An organometallic gold compound is employed to apply the gold dispersion on the catalyst support surface. The organometallic gold compound does not require a fixing procedure, which normally is the cause of low gold metal retention. A preferred invention palladium-gold catalyst has a high gold metal retention, and exhibits durability and long term selectivity in vinyl acetate production.
    Type: Grant
    Filed: May 24, 1996
    Date of Patent: December 23, 1997
    Assignee: Hoechst Celanese Corporation
    Inventors: Tao Wang, Jerry A. Broussard
  • Patent number: 5693586
    Abstract: This invention provides a supported palladium-gold catalyst for vinyl acetate production from ethylene, acetic acid and oxygen. All of the reactants employed in the catalyst preparation are potassium salt compounds which are essentially sodium-free. A preferred invention palladium-gold catalyst provides exceptional improvement of carbon dioxide selectivity in vinyl acetate production.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: December 2, 1997
    Assignee: Hoechst Celanese Corporation
    Inventors: Ioan Nicolau, Philip M. Colling, Leland R. Johnson
  • Patent number: 5691267
    Abstract: A method for preparing a catalyst wherein a catalytic carrier is impregnated with water-soluble palladium and gold compounds followed by fixing and then reducing the fixed palladium and gold compounds to palladium and gold metal followed by impregnating the carrier with a second amount of a water-soluble gold compound. The second amount of gold compound is fixed then reduced to gold metal. The catalyst then is impregnated with an alkali metal acetate such as potassium acetate. The catalyst can be employed to synthesize unsaturated esters such as vinyl acetate.
    Type: Grant
    Filed: August 13, 1996
    Date of Patent: November 25, 1997
    Assignee: Hoechst Celanese Corporation
    Inventors: Ioan Nicolau, Azael T. Flores
  • Patent number: 5616785
    Abstract: Hydroformylation of alkenes to aldehydes in the presence of a rhodium complex catalyst is improved by the addition of a novel bidentate ligand of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.1.sup.' are organic radicals selected from alicyclic, aliphatic and aromatic groups of which at least one is preferably substituted with at least one electronegative moiety and the methylene groups are present at the trans-2,3 positions on the norbornane moiety. The invention also provides a novel method for producing the bidentate ligand and novel intermediate phosphine oxide and phosphinous acid compounds.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: April 1, 1997
    Assignee: Hoechst Celanese Corporation
    Inventors: Jerry D. Unruh, Brigitte E. Segmuller, Gabriel R. Chapa, Kent E. Pryor
  • Patent number: 5603835
    Abstract: This invention relates to a process for improving the color of trimethylolpropane (TMP) by extracting color-causing impurities generated in the reaction to produce TMP. This improved color TMP is characterized by a reduced acid wash color and phthalic anhydride color--color measurement tests commonly used in the industry for assessing product quality and suitability of the TMP for certain color sensitive end-uses.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: February 18, 1997
    Assignee: Hoechst Celanese Corporation
    Inventors: Hung-Cheun Cheung, Rodolfo W. Laurel, George C. Seaman
  • Patent number: 5599976
    Abstract: A method is provided to improve the quality of recycle of certain residues by modifying the separation of alkanes and alkane-like materials and carbonyl-containing impurities from the recycle during the manufacture of acetic acid by the carbonylation of methanol. The improvement comprises partitioning the residues by the addition of water obtained from aqueous streams containing up to 50 wt. % acetic acid and which have been treated in a catalytic distillation unit to react the acetic acid with methanol to form recyclable methyl acetate and water and wherein the water is separated from the organics by distillation.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: February 4, 1997
    Assignee: Hoechst Celanese Corporation
    Inventors: Mark O. Scates, Steven E. Parker, Jennifer B. Lacy, Russell K. Gibbs
  • Patent number: 5591809
    Abstract: The present invention provides novel one-step processes for preparing highly branched macromolecule polymers that have highly controlled molecular architectures. The process comprises the reaction of a branching monomer such as a substituted phenyl compound having the formula: ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are defined herein, with a core monomer and an end-capping monomer, such as a phenolic ester, for a sufficient period of time and at a sufficient temperature to directly produce the highly branched polymer, in a single processing step.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: January 7, 1997
    Assignee: Hoechst Celanese Corporation
    Inventors: Richard Vicari, Kathleen N. Juneau, Carl D. Murphy
  • Patent number: 5578687
    Abstract: A process for preparing a poly(hydroxystyrene) which comprises the steps of (a) heating a carbinol under decomposition conditions in the presence of a solvent for a sufficient period of time to form hydroxystyrene, said solvent having a boiling point in substantially the same range as said hydroxystyrene; and (b) polymerizing said hydroxystyrene under suitable polymerization conditions of pressure and temperature and for a sufficient period of time to form poly(hydroxystyrene).
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: November 26, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: James R. Sounik, Keith M. Russ
  • Patent number: 5576457
    Abstract: A catalyst useful for the manufacture of vinyl acetate from acetic acid, oxygen and ethylene which contains palladium, calcium, and at least one of zirconium and rhenium and the method of manufacture of vinyl acetate using the catalyst.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: November 19, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: Roland Abel
  • Patent number: 5574196
    Abstract: A process for preparing tertiary alkanols which comprises the step of oxidizing with ozone a saturated hydrocarbon having a tertiary carbon center in the presence of a carboxylic acid and for a sufficient period of time and at suitable temperature and pressure to form said alkanols.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: November 12, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Charles E. Tucker, Diane E. Allen, Charles C. Hobbs
  • Patent number: 5567856
    Abstract: Hydroformylation of alkenes to aldehydes in the presence of a rhodium complex catalyst is improved by the addition of a novel bidentate ligand of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.1 ' and R.sub.2 ' are organic radicals selected from alicyclic, aliphatic and aromatic groups of which at least one is preferably substituted with at least one electronegative moiety and the methylene groups are present at the trans-2,3 positions on the norbornane moiety. The invention also provides a novel method for producing the bidentate ligand and novel intermediate phosphine oxide and phosphinous acid compounds.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: October 22, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Jerry D. Unruh, Brigitte E. Segmuller, Gabriel R. Chapa, Kent E. Pryor
  • Patent number: 5567795
    Abstract: The present invention provides novel one-step processes for preparing highly branched macromolecule polymers that have highly controlled molecular architectures. The process comprise the reaction of a branching monomer such as a substituted phenyl compound having the formula: ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are defined herein, with a second monomer (an end-capping monomer) such as a phenolic ester for a sufficient period of time and at a sufficient temperature to directly produce the highly branched polymer, in a single processing step.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: October 22, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Richard Vicari, Kathleen N. Juneau, Carl D. Murphy