Patents Assigned to Occidental Chemical Corporation
  • Difluorophthalic compounds and their preparation
    Patent number: 5405995
    Abstract: Disclosed are novel compounds having the formula ##STR1## where A is O or NR, each R' independently selected from hydrogen, R, or M, R is alkyl, aryl, alkaryl, or aralkyl from C.sub.1 to C.sub.12, and M is a cation. Also disclosed is a method of making those compounds and a method of making a mixture of 3,5-difluorobenzoic acid and 1,3-difluorobenzene by reacting 3,5-dichlorophthalic anhydride with a fluorinating agent to produce 3,5-difluorophthalic anhydride, reacting the 3,5-difluorophthalic anhydride with water to produce 3,5-difluorophthalic acid, and decarboxylating the 3,5-difluorophthalic acid.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: April 11, 1995
    Assignee: Occidental Chemical Corporation
    Inventors: Lawrence B. Fertel, James J. Maul
  • Reducing decomposition of acetates
    Patent number: 5395961
    Abstract: Disclosed is a method of reducing the decomposition of liquid acetates and increasing their storage life. A soluble amine having a pH in water between 9 and 12 is added to the acetate. Also disclosed is a composition of about 1 to about 50 ppm of the amine in the acetate.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: March 7, 1995
    Assignee: Occidental Chemical Corporation
    Inventors: J. Steven Qi, Garra C. Lester
  • Process for making chromic acid
    Patent number: 5393503
    Abstract: Disclosed is an improvement on a process in which sodium chromate is reacted with sulfuric acid to produce sodium bichromate and sodium sulfate, and the sodium bichromate is reacted with sulfuric acid to produce chromic acid and sodium bisulfate. In the improvement, the sodium sulfate and sodium bisulfate are reacted with hydrogen chloride to produce sulfuric acid, which is recycled, and sodium chloride.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: February 28, 1995
    Assignee: Occidental Chemical Corporation
    Inventors: Harry F. Buckholtz, Daniel J. Jaszka
  • Separating vinylcyclohexene from a butadiene extracting solvent
    Patent number: 5382745
    Abstract: Disclosed is a method of separating a butadiene extracting solvent that forms an azeotrope with vinylcyclohexene from a mixture with vinylcyclohexene. The mixture is cooled to a temperature below 0.degree. C. which results in the formation of a vinylcyclohexene phase over an extracting solvent phase and the two phases are physically separated. Also disclosed is apparatus suitable for performing this process.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: January 17, 1995
    Assignee: Occidental Chemical Corporation
    Inventors: Ronald F. Spohn, Mohan S. Saran
  • Method of making 3-methoxy-2,4,5-trifluorobenzoic acid
    Patent number: 5380926
    Abstract: Disclosed is a method of making 3-methoxy-2,4,5-trifluorobenzoic acid. A tetrafluorophthalimide is reacted with an alkali metal hydroxide to produce a mixture of alkali metal salts of 4-hydroxy-3,5,6-trifluoro-N-alkylphthalamic acid and 3-hydroxy-2,4,5-trifluoro-N-alkylbenzamide. Those products are reacted with a methylating agent to produce 4-methoxy-3,5,6-trifluoro-N-alkylphthalamic acid and 3-methoxy-2,4,5-trifluoro-N-alkylbenzamide. Those products are reacted with an acid to produce 4-methoxy-3,5,6-trifluorophthalic acid and 3-methoxy-2,4,5-trifluorobenzoic acid. Finally, the 4-methoxy-3,5,6-trifluorophthalic acid is reacted with a decarboxylating agent to produce additional 3-methoxy-2,4,5-trifluorobenzoic acid.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: January 10, 1995
    Assignee: Occidental Chemical Corporation
    Inventors: Lawrence B. Fertel, William S. Derwin
  • Acetic acid removal from liquid ether acetates
    Patent number: 5371279
    Abstract: Disclosed is a method of making a liquid ether acetate. After reacting acetic acid with the corresponding ether alcohol, the resulting mixture of ether acetate, water, acetic acid, and ether alcohol is, with no distillation, contacted with alumina. Particular ether acetates that can be treated include ethylene glycol monobutyl ether acetate and diethylene glycol monobutyl ether acetate. The treated acetates are more stable to hydrolysis after they have been passed over a bed of alumina.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: December 6, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Jian S. Qi, Garra C. Lester
  • Zero discharge process for manufacturing of phosphorous acid and hypophosphorous acid
    Patent number: 5368832
    Abstract: Disclosed is a method of making phosphorous acid or hypophosphorous acid by reacting hydrogen chloride with a sodium phosphite or a sodium hypophosphite, respectively, in the presence of water to precipitate sodium chloride crystals and form the acid. The acid is separated from the sodium chloride crystals and can be passed through an anion exchange column that is preferably loaded with phosphite or hypophosphite ions, respectively, to remove residual chloride ions.
    Type: Grant
    Filed: June 7, 1991
    Date of Patent: November 29, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Harry E. Buckholtz, Mohan S. Saran, Frederick C. Leitert, David A. Flautt
  • Preparation of 3,5-diaminobenzotrifluoride
    Patent number: 5347052
    Abstract: 3,5-Diaminobenzotrifluoride can be produced, in a single step, by reacting 4-chloro-3,5-dinitrobenzotrifluoride, in methanol, with hydrogen gas, in the presence of magnesium oxide, and in the presence of a catalyst comprising palladium on a carbon support.
    Type: Grant
    Filed: April 15, 1991
    Date of Patent: September 13, 1994
    Assignee: Occidental Chemical Corporation
    Inventor: David E. Albright, Jr.
  • Method of producing extracellular products from aerobic microorganisms
    Patent number: 5342765
    Abstract: Disclosed is a method of producing an extracellular product from an aerobic microorganism. The microorganism is grown in an aqueous medium on one side of an oxygen-permeable surface while the opposite side of the surface is contacted with oxygen. The extracellular product is then harvested from the aqueous medium. The method is particularly useful in producing lignin peroxidase from the white rot fungus Phanerochaete chrysosporium.
    Type: Grant
    Filed: August 1, 1991
    Date of Patent: August 30, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Robert L. Irvine, Rajagopalan Venkatadri
  • Method of making oxydiphthalic anhydride
    Patent number: 5336788
    Abstract: Disclosed is a method of making oxydiphthalic anhydride from oxydiphthalic acid. The oxydiphthalic acid is mixed with an organic liquid that codistills with water and the resulting slurry is heated to the boiling point of the slurry to remove any water. About 1 to about 4 moles of acetic anhydride per mole of oxydiphthalic acid are added to the slurry and the slurry is heated to a temperature between 50.degree. and 160.degree. C. until the oxydiphthalic acid content thereof is less than 0.1 weight percent. The slurry is filtered and the filter cake is heated to a temperature between about 180.degree. C. and below its melting point for about 12 to about 24 hours.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: August 9, 1994
    Assignee: Occidental Chemical Corporation
    Inventor: Viesturs Lesins
  • Purification of 2,4,5-trifluorobenzoic acid
    Patent number: 5336806
    Abstract: Disclosed is a process for isolating and purifying 2,4,5-trifluorobenzoic acid from a solution in a decarboxylating solvent such as NMP. The solution is neutralized with a hydroxide. This results in the formation of a salt of the 2,4,5-trifluorobenzoic acid, which precipitates. The slurry is filtered to collect the precipitated salt and the precipitated salt is dissolved in water. The aqueous solution of the salt is then acidified which results in the reformation and precipitation of the 2,4,5-trifluorobenzoic acid.
    Type: Grant
    Filed: September 20, 1993
    Date of Patent: August 9, 1994
    Assignee: Occidental Chemical Corporation
    Inventor: Jian S. Qi
  • Process for the preparation of 3,5-diaminobenzotrifluoride
    Patent number: 5336808
    Abstract: 3,5-Diaminobenzotrifluoride is prepared by reaction of 4-chloro-3,5-dinitrobenzotrifluoride with sodium formate in acetic acid, in the presence of sodium acetate and palladium on charcoal.
    Type: Grant
    Filed: December 10, 1990
    Date of Patent: August 9, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Ramesh Krishnamurti, Mahendra K. Dosi, Henry C. Lin
  • Paint composition containing ferrophosphorus
    Patent number: 5324346
    Abstract: Disclosed is a paint composition of about 50 to about 95 wt % of a pigment, about 5 to about 50 wt % of a binder and sufficient solvent to give a solids content of about 30 to about 100 wt %. The pigment has two components--about 0 to about 90 wt % zinc and about 10 to about 100 wt % of a particular type of ferrophosphorus. The ferrophosphorus of this invention contains about 45 to about 63 wt % iron, about 20 to about 35 wt % phosphorus, about 2 to about 10 wt % vanadium, and about 1 to about 10 wt % chromium.
    Type: Grant
    Filed: September 20, 1993
    Date of Patent: June 28, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Russell J. Morgan, Gerald L. Evarts
  • Synthesis of 4-substituted phthalic anhydrides
    Patent number: 5322954
    Abstract: Disclosed is a method of making a 4-substituted phthalic anhydride. A halomaleic (including halofumaric anhydride (or the acid or ester thereof) is made by the reaction of-maleic anhydride with chlorine or bromine. The halomaleic anhydride is reacted with a conjugated diene to form a first cycloadduct having the formula ##STR1## The first cycloadduct is heated to eliminate HX and produce a second cycloadduct having the formula ##STR2## The second cyclo adduct is dehydrogenated to produce a 4substituted phthalic anhydride which has the formula ##STR3## where R.sub.1, R.sub.2, and R.sub.4 are preferably H and R.sub.3 is preferably Cl or F.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: June 21, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Karl W. Seper, Jeffrey S. Stults, Gary H. Olsen
  • Polyimidesiloxane solution and method of coating substrates
    Patent number: 5317049
    Abstract: Disclosed is a solution which comprises(a) a substantially fully imidized polyimidesiloxane; and(b) a solvent which comprises at least 50 wt % of a substituted pyrrolidone having the general formula ##STR1## where R is aliphatic or cycloaliphatic from C.sub.3 to C.sub.10. Also disclosed is a method of forming a coating on a substrate by applying the solution to the substrate and evaporating the solvent. Coatings formed from this solution are not subject to whitening as are coatings formed from the same polymers in other solvents.
    Type: Grant
    Filed: June 21, 1993
    Date of Patent: May 31, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Sergio R. Rojstaczer, David Y. Tang, John A. Tyrell
  • Method for separating chlorine from a mixture of gases
    Patent number: 5308383
    Abstract: Disclosed is a method of removing chlorine from a mixture of gases. The mixture of gases is contacted with a liquid which contains a compound having the general formula ##STR1## where n is 1 to 3, whereby chlorine in the mixture of gases is absorbed by the liquid. The liquid is then heated to volatilize the chlorine and separate it from the liquid.
    Type: Grant
    Filed: June 21, 1993
    Date of Patent: May 3, 1994
    Assignee: Occidental Chemical Corporation
    Inventor: Edward A. Rowe
  • Method of making 1,1'-sulfonylbis[3-nitro-5-(trifluoromethyl)benzene]
    Patent number: 5304682
    Abstract: Disclosed is a method of making 1,1'-sulfonylbis[3-nitro-5-(trifluoromethyl) benzene] by reacting dibenzotrifluoride sulfide with at least four equivalents of fuming nitric acid and at least four equivalents of fuming sulfuric acid at a temperature below 20.degree. C., until the sulfide link is oxidized to a sulfone link, then raising the temperature to above 20.degree. C. until the reaction is complete. Also disclosed is the preparation of 1,1'-sulfonylbis[3-nitro-(5-trifluoromethyl) benzenamine] by reducing the benzene compound.
    Type: Grant
    Filed: August 17, 1989
    Date of Patent: April 19, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Jeffrey S. Stults, Henry C. Lin
  • Photochlorination of phthalic anhydride
    Patent number: 5300201
    Abstract: Phthalic anhydride can be photochlorinated in the vapor phase to give good yields of 4-chlorophthalic anhydride at temperatures of 250.degree. to 400.degree. C. Optionally, the process can be run to produce di, tri, and tetrachlorophthalic anhydrides.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: April 5, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Karl W. Seper, John R. Molinaro
  • Use of phenothiazine derivatives to inhibit scale build up during polymerization of vinyl chloride
    Patent number: 5298578
    Abstract: Polyvinyl chloride reactor wall scale is reduced by conducting the polymerization in the presence of a phenothiazine dimer or higher oligomer made by reacting an aldehyde such as acetaldehyde or benzaldehyde with phenothiazine, or by reacting 2-acetylphenothiazine with formaldehyde.
    Type: Grant
    Filed: October 20, 1989
    Date of Patent: March 29, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Raymond C. DeWald, Paul O. Hong
  • Process for selective hydrodefluorination
    Patent number: 5294738
    Abstract: A process for the selective hydrodefluorination of a tetrafluorophthalimide compound of the formula ##STR1## where X is 1 and R is a monovalent organo group; or X is 2 and R is a divalent organo group; comprises reacting (I) the tetrafluorophthalimide with zinc in an aqueous alkali metal hydroxide medium. The product may be hydrolyzed to form 3,4,6-trifluorophthalic acid.
    Type: Grant
    Filed: April 3, 1992
    Date of Patent: March 15, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Jeffrey S. Stults, Lawrence B. Fertel, William S. Derwin