Patents by Inventor Richard Krabetz

Richard Krabetz 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).

  • Patent number: 5221767
    Abstract: Compositions of the formula IMo.sub.12 P.sub.a V.sub.b X.sub.c.sup.1 X.sub.d.sup.2 X.sub.e.sup.3 Sb.sub.f Re.sub.g S.sub.h O.sub.n (I),whereX.sup.1 is potassium, rubidium and/or cesium,X.sup.2 is copper and/or silver,X.sup.3 is cerium, boron, zirconium, manganese and/or bismuth,a is from 0.5 to 3.0,b is from 0.01 to 3.0,c is from 0.2 to 3.0,d is from 0.01 to 2.0,e is from 0 to 2.0,f is from 0.01 to 2.0,g is from 0 to 1.0,h is from 0.001 to 0.5 andn is a number determined by the valency and content of the elements different from oxygen in I, are used as catalysts for preparing methacrylic acid by gas-phase oxidation of methacrolein.
    Type: Grant
    Filed: August 12, 1992
    Date of Patent: June 22, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl-Heinz Boehning, Gerd Duembgen, Ulrich Hammon, Richard Krabetz, Franz Merger, Matthias Schwarzmann, Fritz Thiessen, Herbert Vogel
  • Patent number: 5173468
    Abstract: Compositions of the formula IMO.sub.12 P.sub.a V.sub.b X.sup.1.sub.c X.sup.2.sub.d X.sup.3.sub.e Sb.sub.f Re.sub.g S.sub.h O.sub.n (I)whereX.sup.1 is potassium, rubidium and/or cesium,X.sup.2 is copper and/or silver,X.sup.3 is cerium, boron, zirconium, manganese and/or bismuth,a is from 0.5 to 3.0,b is from 0.01 to 3.0,c is from 0.2 to 3.0,d is from 0.01 to 2.0,e is from 0 to 2.0,f is from 0.01 to 2.0,g is from 0 to 1.0,h is from 0.001 to 0.5 andn is a number determined by the valency and content ofthe elements different from oxygen in I, are used as catalysts for preparing methacrylic acid by gas-phase oxidation of methacrolein.
    Type: Grant
    Filed: July 12, 1991
    Date of Patent: December 22, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl-Heinz Boehning, Gerd Duembgen, Ulrich Hammon, Richard Krabetz, Franz Merger, Matthias Schwarzmann, Fritz Thiessen, Herbert Vogel
  • Patent number: 5087744
    Abstract: Methacrylic acid can be prepared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250.degree. to 400.degree. C. with cooling of the hot reaction gas to below 100.degree. C., absorption of the methacrylic acid in a water-operated absorption column, at below 100.degree. C. and partial recycling into the oxidation reactor after admixture of methacrolein or isobutyraldehyde and oxygen by feeding a quantity of methacrolein or isobutyraldehyde equal to the quantity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorber column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas a side stream which is washed in a wash column operated with water at <10.degree. C.
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: February 11, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Gerd Duembgen, Franz Merger, Michael Jaeger, Fritz Thiessen, Herbert Vogal
  • Patent number: 4925823
    Abstract: Oxidation catalysts of the general formulaMo.sub.12 P.sub.a W.sub.b Sb.sub.c As.sub.d Cu.sub.e X.sub.f O.sub.xwhereX is Nb, Fe, Mn, Sn and/or Cr,a is 0.1-3,b is 0.1-4,c is <0-2,d is 0-1,e is 0-1,d+e is <0-2,f is 0-1.5,e+f is 0-2 andx is the number of oxygen atoms formally required to saturate the valencies of the other catalyst components,may be used particularly advantageously for the preparation of methacrylic acid by gas phase oxidation of methacrolein.
    Type: Grant
    Filed: June 19, 1986
    Date of Patent: May 15, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Gerd Duembgen, Friedbert Nees, Franz Merger, Gerd Fouquet
  • Patent number: 4656157
    Abstract: A molded catalyst for reactions carried out under heterogeneous catalysis consists of a catalytically active material shaped into hollow cylinders, or of an inert carrier which is shaped into hollow cylinders and onto which catalytically active material is applied the external diameter of the hollow cylinders being from 3 to 20 mm, the internal diameter being from 0.1 to 0.7 times the external diameter and the length being from 0.2 times to twice the external diameter. The end faces of the hollow cylinder are curved so that the radius of curvature is from 0.4 to 5 times the external diameter.The novel catalysts are particularly useful for partial oxidation in the gas phase.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: April 7, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedbert Hofmann, Richard Krabetz, Matthias Schwarzmann
  • Patent number: 4638085
    Abstract: A catalyst which is free from alkali metal compounds and alkaline earth metal compounds, contains palladium and lead as active constituents and is supported on a carrier which contains two or more of the oxides ZnO, Al.sub.2 O.sub.3, La.sub.2 O.sub.3 and TiO.sub.2, and the use of this catalyst for the preparation of methyl methacrylate from methacrolein, methanol and oxygen.
    Type: Grant
    Filed: November 21, 1984
    Date of Patent: January 20, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz J. Broecker, Gerd Duembgen, Gerd Fouquet, Richard Krabetz, Franz Merger, Friedbert Nees
  • Patent number: 4620035
    Abstract: Production of acrylic acid by oxidation of acrolein with gas containing oxygen in the gas phase at elevated temperature in the presence of a catalyst which, in addition to oxygen, consists essentially of (a) molybdenum, (b) tungsten, (c) vanadium and (d) iron and/or copper. The atomic ratio of molybdenum:tungsten:iron and/or copper is 1 to 20:0.01 to 10:1 and the atomic ratio of vanadium:molybdenum is 0.2 to 6:6. Acrylic acid is an important starting material for the production of high polymers.
    Type: Grant
    Filed: October 9, 1981
    Date of Patent: October 28, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Heinz Engelbach
  • Patent number: 4595778
    Abstract: Oxidation catalysts of the general formulaW.sub.6 Mo.sub.a V.sub.b P.sub.c Cu.sub.d As.sub.e Sb.sub.f X.sub.g Y.sub.h O.sub.xwhere X is K, Rb and/or Cs, Y is Nb, Fe, Mn, Sn, Li, Na, Sr, Rh, Ce, Ti and/or Cr, a is from 2.0 to 6, b is from 0 to 3, c is from 0.1 to 3, d is from 0.01 to 1, e is from 0 to 1, f is from 0 to 2, g is from 0.01 to 3, h is from 0 to 1 and x is the number of oxygen atoms formally required to saturate the valencies of the catalyst components, give high conversions and particularly high selectivity in the oxidation of methacrolein in the gas phase to methacrylic acid.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: June 17, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerd Duembgen, Gerd Fouquet, Richard Krabetz, Franz Merger, Friedbert Nees
  • Patent number: 4520125
    Abstract: Catalysts for the preparation of carboxylates from an aldehyde and an alkanol in the presence of oxygen, which contain palladium and lead as active components, these being present on a carrier containing zinc oxide, and the palladium being applied as a palladium salt in a solution containing hydrochloric acid and then being liberated by reduction, and whose carrier consists solely of zinc oxide, are particularly active and selective.
    Type: Grant
    Filed: February 23, 1984
    Date of Patent: May 28, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl Baer, Peter Bassler, Gerd Duembgen, Gerd Fouquet, Richard Krabetz, Franz Merger, Friedbert Nees
  • Patent number: 4496770
    Abstract: .alpha.-Alkylacroleins are prepared by a process wherein an alkanal is reacted with formaldehyde in the presence of a secondary amine and in the presence or absence, of an acid, in the liquid phase, under superatmospheric pressure and at above 150.degree. C., for not more than 25 minutes.The .alpha.-alkylacroleins obtainable by the process are useful starting materials for dyes, drugs and pesticides.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: January 29, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerd Duembgen, Gerd Fouquet, Richard Krabetz, Ekhart Lucas, Franz Merger, Friedbert Nees
  • Patent number: 4489170
    Abstract: Oxidation catalysts which in addition to oxygen ions, with or without NH.sub.4.sup.+ ions, contain molybdenum, tungsten, phosphorus and antimony as basic components, in the atomic ratio Mo:W:P:Sb=12:0.1-3:0.1-4:0.1-3, and which are prepared in a conventional manner by combining molybdenum, phosphorus, antimony and tungsten compounds in aqueous solutions or suspensions, removing the water and calcining the residues, the combination being carried out at chloride ion concentrations of less than 0.3 mole per mole of molybdenum and in the presence of ions of monocarboxylic acids of 1 or 2 carbon atoms, dicarboxylic acids or hydroxycarboxylic acids, are particularly suitable for the gas phase oxidation of methacrolein to methacrylic acid.
    Type: Grant
    Filed: March 1, 1983
    Date of Patent: December 18, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Matthias Schwarzmann
  • Patent number: 4487962
    Abstract: An oxidation catalyst wherein the catalytically active component has the general formulaMo.sub.12 P.sub.a Rh.sub.b Cu.sub.c V.sub.d Cs.sub.e X.sub.f Y.sub.g Z.sub.h O.sub.x,where X is Cr and/or Fe, Y is Nb, Z is Na, Li, K and/or Rb, a is 0.1-4, b is 0.001-1, c is 0.05-2, d is 0.05-4, e is 0.1-5, f is 0-2, g is 0-3 and h is 0-2, and x is the number of oxygen atoms required to saturate the valencies of the other constituents, is very suitable for the preparation of methacrylic acid by gas phase oxidation of methacrolein with an oxygen-containing and steam-containing gas mixture.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: December 11, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Franz Merger, Matthias Schwarzmann
  • Patent number: 4409128
    Abstract: An oxidation catalyst wherein the catalytically active component has the general formulaMo.sub.12 P.sub.a Rh.sub.b Cu.sub.c V.sub.d Cs.sub.e X.sub.f Y.sub.g Z.sub.h O.sub.x,where X is Cr and/or Fe, Y is Nb, Z is Na, Li, K and/or Rb, a is 0.1-4, b is 0.001-1, c is 0.05-2, d is 0.05-4, e is 0.1-5, f is 0-2, g is 0-3 and h is 0-2, and x is the number of oxygen atoms required to saturate the valencies of the other constituents, is very suitable for the preparation of methacrylic acid by gas phase oxidation of methacrolein with an oxygen-containing and steam-containing gas mixture.
    Type: Grant
    Filed: July 15, 1981
    Date of Patent: October 11, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Franz Merger, Matthias Schwarzmann
  • Patent number: 4305843
    Abstract: A coated catalyst comprising (a) an inert carrier having particles of not less than 100 .mu.m diameter and a surface area of up to 20 m.sup.2 /g and (b) a coating which contains the catalytic material and adheres firmly to the outer surface and to the edge zone, near the surface, of the carrier particles, can be prepared by applying the catalytic material as a 10-70% strength suspension in water to the agitated carrier particles, which are at below 70.degree. C., if the suspension is sprayed, at a constant rate of from 0.01 to 2.0 kg of active material/hour/liter of carrier onto the carrier particles, while at the same time uniformly passing from 0.1 to 12 m.sup.3 (S.T.P.)/hour/liter of carrier of an inert gas at from 20.degree. to 300.degree. C. over the carrier particles, under conditions such that the water only evaporates incompletely but the water content of the resulting coating is less than the maximum degree of saturation of the catalytic material.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: December 15, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Heinz Engelbach, Peter Palm, Heinrich Spahn, Walter Herrmann
  • Patent number: 4298763
    Abstract: Acrolein and methacrolein are prepared advantageously by oxidizing propylene or isobutylene, respectively, with an oxygen-containing gas mixture under conventional conditions over a supported catalyst possessing a firmly adhering coating, from 150 to 1,500 .mu.m thick, which contains calcined catalytic material based on molybdenum oxide and has a carrier core with a surface area of less than 15 m.sup.2 /g and a diameter of more than 100 .mu.m, if a coated catalyst is used which has been prepared by applying calcined catalytic material having a particle size of from 0.1 to 300 .mu.m, in an amount of from 1 to 40 g/min/liter of carrier and water in a weight ratio of catalytic material to water of from 1:1 to 8:1, continuously and separately from one another, each at a constant speed, at below 100.degree. C.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: November 3, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Engelbach, Richard Krabetz, Gerd Duembgen, Carl-Heinz Willersinn, Walter Beitelschmidt
  • Patent number: 4297247
    Abstract: A coated catalyst comprising (a) an inert carrier having a particle diameter of not less than 100 .mu.m and a surface area of up to 20 m.sup.2 /g and (b) a coating which firmly adheres to the outer surface and in the edge zone, near the surface, of the carrier particles, and which contains the catalytic material, can be prepared by applying the catalytic material in the form of a powder of particle size not more than 300 .mu.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: October 27, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Walter Herrmann, Heinz Engelbach, Peter Palm, Karl Sommer, Heinrich Spahn
  • Patent number: 4259211
    Abstract: Catalysts which consist of a molded carrier, the surface of which is coated with an active catalyst composition of the general formula Mo.sub.12 A.sub.a B.sub.b C.sub.c D.sub.d O.sub.x, where A is V and/or W, B is Cu and/or Fe and/or Mn and/or Ni and/or Cr, C is Nb and/or Ta and/or Bi and/or Sb and/or Sn and/or Th and/or Ce and/or U, D is Li and/or Na and/or K and/or Rb and/or Cs and/or Tl and a is from 0.1 to 18, b is from 0 to 8, c is from 0 to 10, d is from 0 to 2 and x is from 36 to 135, which are particularly active and selective for the oxidation of acrolein and methacrolein with oxygen-containing gases to give acrylic acid and methacrylic acid, respectively, are obtained by first manufacturing the catalyst composition, before applying it to the carrier, from thermally easily decomposed salts of the components by mixing aqueous solutions, slurries or moist solid masses of the salts of the components, drying the mixture and calcining the dried composition at from 140.degree. to 600.degree. C.
    Type: Grant
    Filed: November 24, 1978
    Date of Patent: March 31, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Walter Herrmann, Norbert Scholz, Heinz Engelbach, Gerd-Juergen Engert, Carl-Heinz Willersinn, Gerd Duembgen, Fritz Thiessen
  • Patent number: 4110370
    Abstract: In the oxidation of propylene and/or acrolein, high-boiling or non-volatile byproducts are separated from the solvents used for absorbing the acrylic acid by treating the said solvents laden with byproducts with the hot reaction gases in such amounts that the major portion of the solvents evaporates, the residual solvent containing a high percentage of said byproducts then being discarded or worked up.
    Type: Grant
    Filed: October 7, 1975
    Date of Patent: August 29, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Engelbach, Richard Krabetz, Gerd Duembgen, Carl-Heinz Willersinn, Walter Frey, Ulrich Lebert, Fritz Thiessen
  • Patent number: 4052450
    Abstract: In the oxidation of .alpha.-olefins in the gas phase to .alpha.,.beta.-olefinically unsaturated aldehydes and carboxylic acids with molecular oxygen in the presence of an inert gas using a catalyst containing molybdenum and bismuth with elements as oxides or mixed oxides at from 280.degree. to 450.degree. C a content of indium and/or aluminum and/or lanthanum and/or gallium as oxide or mixed oxide results in an improvement in the conversion and/or activity and/or life of the catalyst.
    Type: Grant
    Filed: October 10, 1973
    Date of Patent: October 4, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Heinz Engelbach, Ulrich Lebert, Walter Frey, Gerd Duembgen, Fritz Thiessen, Carl-Heinz Willersinn
  • Patent number: 4031135
    Abstract: In the oxidation of propylene to acrylic acid in the gas phase in two spatially separate oxidation stages, a part of the off-gas, which has been freed from condensable products, is fed to the oxidation stages in addition to freshly charged propylene and air, under the following conditions:A. The recycled off-gas and air are in part fed to the first oxidation stage and in part to the second oxidation stage,B. The molar ratio of propylene : oxygen : residual gases fed to the first stage is 1 : 1.5-2.3 : 11-19,C. The molar ratio of the total propylene fed in, to the total oxygen fed in, in the form of air or off-gas, before and after the first stage, and to the total residual gases fed in is 1 : 1.9-2.5 : 13-25, with the proviso thatD. The air and the recycled off-gas are divided between the two feed points in such a way that from 10 to 50% by volume of the total quantity of air and off-gas fed in are added after the first stage andE.
    Type: Grant
    Filed: July 11, 1975
    Date of Patent: June 21, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Engelbach, Richard Krabetz, Gerd Duembgen, Carl-Heinz Willersinn, Ulrich Lebert, Fritz Thiessen