Patents by Inventor Claus-Ulrich Priester

Claus-Ulrich Priester 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: 5637700
    Abstract: Caprolactam is purified by oxidative treatment in which mixtures which essentially contain the caprolactam to be purified and unsaturated lactams are treated with oxygen or an oxygen-containing gas mixture in an alkaline medium.
    Type: Grant
    Filed: August 30, 1994
    Date of Patent: June 10, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Hugo Fuchs, Gerald Neubauer, Claus-Ulrich Priester
  • Patent number: 5536831
    Abstract: Caprolactam is obtained from caprolactam-containing polymers in the presence of a base under reduced pressure by depolymerizing polymers which contain the repeating unit --[--N(H)--(CH.sub.2).sub.5 --C(O)--] or mixtures consisting essentially offrom 50 to 99.99% by weight of a polymer containing the repeating unit --[--N(H)--(CH.sub.2).sub.5 --C(O)--]--from 0.01 to 50% by weight of additives selected from the group consisting of inorganic fillers, organic and inorganic pigments and dyes,from 0 to 10% by weight of organic and/or inorganic additives,from 0 to 40% by weight of non-polyamide-containing polymers andfrom 0 to 20% by weight of polyamides, with the exception of polycaprolactam and copolyamides prepared from caprolactam,in at least two depolymerization reactors connected in series.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: July 16, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael Kopietz, Alan Handerman, Simon Jones, Ulrich Kalck, Claus-Ulrich Priester, Heinz Auer, Josef Ritz, Hugo Fuchs, Paul Pijl
  • Patent number: 5455346
    Abstract: Caprolactam is obtained from mixtures which contain polymers or thermoplastic molding materials having the repeating unit--N(H)--(CH.sub.2).sub.5 --C(O)--(a) by cleavage at elevated temperatures in the presence of a base under reduced pressure or (b) in the presence of water, by using a mixture essentially comprisingfrom 50 to 99.9% by weight of a polymer or of a thermoplastic molding material having the repeating unit--N(H)--(CH.sub.2).sub.5 --C(O)--from 0.1 to 50% by weight of additives selected from the group consisting of inorganic fillers, organic and inorganic pigments and dyes,from 0 to 10% by weight of organic and/or inorganic additives,from 0 to 40% by weight of non-polyamide-containing polymers andfrom 0 to 20% by weight of polyamides, with the exception of polycaprolactam and copolyamides prepared from caprolactam,and carrying out the cleavage in the presence of a base under reduced pressure, the water content of the mixture used being not more than 0.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: October 3, 1995
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael Kopietz, Ulrich Kalck, Simon Jones, Peter Bassler, Claus-Ulrich Priester
  • Patent number: 5434291
    Abstract: A process for the preparation of aminopropionitriles of the general formula I ##STR1## in which R denotes hydrogen or methyl, wherein ammonia is caused to react with an acrylonitrile of the general formula II ##STR2## In which the substituent has the aforementioned meanings, in a molar ratio of from 1:1 to 500:1 over a heterogenic catalyst at temperatures ranging from 40.degree. to 180.degree. C. and pressures ranging from 10 to 350 bar.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: July 18, 1995
    Assignee: BASF Aktiengsellschaft
    Inventors: Tom Witzel, Rudolf Kummer, Franz Merger, Guido Voit, Martin Brudermueller, Claus-Ulrich Priester, Wolfgang Harder
  • Patent number: 5371292
    Abstract: A process for the preparation of 3-aminomethyl-3,5,5-trimethyl-cyclohexylamine from 3-cyano-3,5,5-trimethyl-cyclohexanone, wherein the following stages are carried out in discrete reaction chambers:a) the 3-cyano-3,5,5-trimethyl-cyclohexanone is reacted in a first reaction chamber with excess ammonia over an acidic metal oxide catalyst at a temperature of from 20.degree. to 150.degree. C. and a pressure of from 15 to 500 bar, andb) in a second reaction chamber, the reaction product from stage a) is hydrogenated with hydrogen at a temperature of from 60.degree. to 150.degree. C. and a pressure of from 50 to 300 bar in the presence of excess ammonia over a catalyst containing cobalt, nickel, ruthenium, and/or some other noble metal, which catalyst optionally contains a basic component or is supported by neutral or basic supporting material.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: December 6, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Claus-Ulrich Priester, Tom Witzel, Gerhard Koppenhoefer, Wolfgang Harder
  • Patent number: 5360905
    Abstract: A process for recovering caprolactam from oligomers and/or polymers of caprolactam comprises the following steps:a) treating oligomers and/or polymers of caprolactam with from 1 to 20 parts by weight of water per part by weight of oligomer or polymer at from 200.degree. to 350.degree. C. under superatmospheric pressure with a residence time of from 0.5 to 10 hours to form an aqueous reaction mixture comprising polycaprolactam, monomeric caprolactam and oligomers thereof, andb) passing the aqueous reaction mixture obtained in a) into a fluidized bed of alumina at from 250.degree. to 400.degree. C. to obtain a mixture of steam and caprolactam.
    Type: Grant
    Filed: May 14, 1993
    Date of Patent: November 1, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Hugo Fuchs, Claus-Ulrich Priester, Gerald Neubauer, Erwin Brunner, Josef Ritz, Michael Kopietz
  • Patent number: 5359062
    Abstract: Caprolactam is recovered from polycaprolactam by hydrolyric cleavage of polycaprolactam with from 5 to 50 parts by weight of water per part by weight of polycaprolactam at from 200.degree. to 350.degree. C. under superatmospheric pressure to give an aqueous solution or suspension which contains monomeric caprolactam and oligomers thereof and may contain polycaprolactam and subsequent isolation of monomeric caprolactam from the aqueous solution or suspension by distillation or extraction, by a process in which the hydrolyric cleavage is carried out in the presence of an alkali metal hydroxide at a pH of from 5 to 10.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: October 25, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Hugo Fuchs, Gerald Neubauer, Josef Ritz, Claus-Ulrich Priester
  • Patent number: 5350847
    Abstract: Caprolactam is purified by oxidative treatment in which mixtures which essentially contain the caprolactam to be purified and unsaturated lactams are treated with oxygen or an oxygen-containing gas mixture in an alkaline medium.
    Type: Grant
    Filed: August 30, 1993
    Date of Patent: September 27, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Hugo Fuchs, Gerald Neubauer, Claus-Ulrich Priester
  • Patent number: 5344983
    Abstract: Process for preparing a pentane-1,5-diamine of the formula ##STR1## where R.sup.1 represents a variety of organic radicals including alkyl which can bear substituents such as hydroxyl, halogen, alkoxy, carbalkoxy, carboxyl, alkylamino, cycloalkyl or aryl, andR.sup.2 and R.sup.3 independently of one another, represent hydrogen or have the same meanings as R.sup.1 or together are a C.sub.4 -C.sub.7 -alkylene chain which is unsubstituted or substituted by one to five C.sub.1 -C.sub.4 -alkyl groups,which comprises:(a) reacting a .gamma.-cyanoketone of the formula ##STR2## where R.sup.1, R.sup.2 and R.sup.3 have the meanings given above, with excess ammonia in a first reaction space on an acidic heterogeneous catalyst at 20.degree.-150.degree. C. and 15-500 bar, and(b) hydrogenating the resulting reaction product in a second separate reaction space in the presence of excess ammonia on a cobalt, nickel or noble metal catalyst at 50.degree.-180.degree. C. and 30-500 bar.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: September 6, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Tom Witzel, Eberhard Fuchs, Franz Merger, Claus-Ulrich Priester
  • Patent number: 5247120
    Abstract: Abstract of the Disclosure: Aminopropionitriles of the general formula I ##STR1## where R is hydrogen or methyl, wherein ammonia is reacted with an acrylonitrile of the general formula II ##STR2## where the substituents have the abovementioned meanings, in a molar ratio of from 1:1 to 500:1 over a heterogeneous catalyst at from 40.degree. to 180.degree. C. and from 10 to 350 bar.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: September 21, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Martin Brudermueller, Claus-Ulrich Priester, Wolfgang Harder, Siegfried Winderl
  • Patent number: 5239120
    Abstract: A process for the preparation of a 2-(3-aminopropyl)-cycloalkylamine of the general formula I ##STR1## in which the subscript n is an integer from 1 to 4, from a 2-(2-cyanoethyl)-cycloalkanone of the general formula II ##STR2## in which the subscript n has the meaning stated, wherein the following stages are carried out in discrete reaction chambers:a) the 2-(2-cyanoethyl)-cycloalkanone of formula II is reacted in a first reaction chamber with excess ammonia over an acidic heterogeneous catalyst at a temperature from 20.degree. to 150.degree. C. and a pressure of from 15 to 500 bar, andb) in a second reaction chamber, the reaction product from stage a) is hydrogenated at a temperature of from 60.degree. to 150.degree. C. and a pressure of from 50 to 300 bar in the presence of excess ammonia over a catalyst containing cobalt, nickel, ruthenium, and/or some other noble metal, which catalyst optionally contains a basic component or is supported on neutral or basic supporting material.
    Type: Grant
    Filed: March 27, 1991
    Date of Patent: August 24, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Claus-Ulrich Priester, Gerhard Koppenhoefer, Wolfgang Harder, Tom Witzel, Helmut Lermer, Ulrich Koehler
  • Patent number: 5194607
    Abstract: Triphendioxazine dyes suitable for dyeing or printing hydroxyl- or amido-containing substrates have the formula ##STR1## where n is 0 or 1,m is 1 or 2,R.sup.1 and R.sup.2 are each independently of the other hydrogen, chlorine, bromine, hydroxysulfonyl, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, substituted or unsubstituted phenyl or substituted or unsubstituted phenoxy,R.sup.3 is halogen, carboxyl, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, vinylsulfonyl or the radical --SO.sub.2 --CH.sub.2 CH.sub.2 --Z, where Z is a leaving group, andQ.sup.1 and Q.sup.2 are each independently of the other a radical of the formula ##STR2## where R.sup.4 and R.sup.5 are each independently of the other hydrogen, C.sub.1 -C.sub.4 -alkyl or phenyl,R.sup.6 is hydrogen or a fiber-reactive radical,L.sup.1 and L.sup.2 are each independently of the other substituted or unsubstituted C.sub.2 -C.sub.8 -alkylene or phenylene,X is a chemical bond, oxygen, sulfur, imino, C.sub.1 -C.sub.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: March 16, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Patsch, Claus Marschner, Claus-Ulrich Priester
  • Patent number: 5166443
    Abstract: A process for the preparation of a 2,2-disubstituted pentane-1,5-diamine of the formula I ##STR1## where R.sup.1 and R.sup.2, independently of one another, are C.sub.1 - to C.sub.10 -alkyl or C.sub.2 - to C.sub.10 -alkenyl or together are a C.sub.4 - to C.sub.7 -alkylene chain which is unsubstituted or monosubstituted to pentasubstituted by C.sub.1 - to C.sub.4 -alkyl, from a 2,2-disubstituted 4-cyanobutanal of the formula II ##STR2## where R.sup.1 and R.sup.2 are as defined above, comprises, in two spatially separate reaction spaces,a) reacting the 4-cyanobutanal of the formula II, in a first reaction space, with excess ammonia on an acidic heterogeneous catalyst at from 20.degree. to 150.degree. C.
    Type: Grant
    Filed: March 17, 1991
    Date of Patent: November 24, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Claus-Ulrich Priester, Tom Witzel, Gerhard Koppenhoefer, Ludwig Schuster
  • Patent number: 5068398
    Abstract: 6-Aminocaproic esters are prepared by reacting alkyl 5-formylvalerates with excess ammonia and hydrogen in the presence of ruthenium catalysts at elevated temperature under superatmospheric pressure in liquid ammonia as reaction medium.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: November 26, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Rolf Fischer, Wolfgang Harder, Claus-Ulrich Priester, Uwe Vagt
  • Patent number: 4965362
    Abstract: 3-Dialkylaminopropionitriles ##STR1## where R.sup.1 and R.sup.2 are each C.sub.1 -C.sub.4 -alkyl which may furthermore be bonded to form a 5-membered or 6-membered ring, bis-(2-cyanoethyl) ether IINC--CH.sub.2 --CH.sub.2 --O--CH.sub.2 --CH.sub.2 --CN IIand, if desired, ethylenecyanohydrin IIIHO--CH.sub.2 --CH.sub.2 --CN IIIare prepared jointly by a process in which(a) acrylonitrile and water are reacted in the presence of a base at from 60.degree. to 150.degree. C. to give a mixture of acrylonitrile, water and bis-(2-cyanoethyl) ether II, the base being a mineral base, a quaternary nitrogen base or a mixture of these,(b) this mixture is reacted at about 0.degree.-50.degree. C.
    Type: Grant
    Filed: July 6, 1989
    Date of Patent: October 23, 1990
    Inventors: Franz Merger, Wolfgang Harder, Peter Hettinger, Claus-Ulrich Priester, Dieter Franz, Dieter Voges
  • Patent number: 4963673
    Abstract: Caprolactam is prepared by heating a 6-aminocaproic ester in liquid phase in the presence of water to 230.degree.-350.degree. C. under superatmospheric pressure in a reaction medium comprising a liquid aromatic hydrocarbon having a boiling point of from 80.degree. to 240.degree. C. which is inert under reaction conditions, and isolating caprolactam from the reaction mixture.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: October 16, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Rolf Fischer, Claus-Ulrich Priester
  • Patent number: 4963672
    Abstract: Caprolactam is prepared in a process comprising the following steps:(a) reacting the 5-formylvaleric ester with liquid ammonia as reaction medium and hydrogen in the presence of a ruthenium catalyst in liquid phase at from 80.degree. to 140.degree. C. under a hydrogen partial pressure of from 40 to 100 bar,(b) replacing the reaction medium ammonia by an aromatic hydrocarbon having a boiling point of from 80.degree. to 240.degree. C. which is liquid under the reaction conditions,(c) heating the resulting mixture in liquid phase under superatmospheric pressure at 230.degree.-350.degree. C. to form caprolactam, and(d) isolating caprolactam from the resulting reaction mixture.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: October 16, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Rolf Fischer, Wolfgang Harder, Claus-Ulrich Priester, Uwe Vagt
  • Patent number: 4767857
    Abstract: Caprolactam is prepared by heating a 6-aminocaproic ester at 100.degree.-320.degree. C. in the presence of a reaction medium comprising an aromatic hydrocarbon which is liquid under reaction conditions and has a boiling point from 80.degree. to 240.degree. C., and isolating caprolactam from the reaction medium.
    Type: Grant
    Filed: December 16, 1987
    Date of Patent: August 30, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Claus-Ulrich Priester, Rolf Fischer, Manfred Sauerwald
  • Patent number: 4767856
    Abstract: In an improved process for preparing caprolactam by heating 6-aminocaproic acid, an ester or amide or mixture thereof in the presence of an inert reaction medium which is liquid under the reaction conditions and has a boiling point above that of caprolactam, the improvement comprises using as the reaction medium a hydrocarbon, maintaining a temperature of from 150.degree. to 350.degree. C., charging the 6-aminocaproic acid, ester, amide or mixture thereof at a rate commensurate with their rate of conversion, and separating caprolactam from the reaction mixture at a rate commensurate with its rate of formation.
    Type: Grant
    Filed: December 15, 1987
    Date of Patent: August 30, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Toni Dockner, Manfred Sauerwald, Rolf Fischer, Hans-Martin Hutmacher, Claus-Ulrich Priester, Uwe Vagt
  • Patent number: 4766237
    Abstract: In an improved process for the preparation of 6-aminocaproates by reacting a 5-formylvalerate with ammonia and hydrogen using an alkanol as a solvent in the presence of a hydrogenation catalyst at elevated temperatures and under superatmospheric pressure, the improvement comprises carrying out the reaction at from 40.degree. to 95.degree. C.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: August 23, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans-Martin Hutmacher, Franz J. Broecker, Franz Merger, Rolf Fischer, Uwe Vagt, Heinz-Walter Schneider, Wolfgang Richter, Wolfgang Harder, Claus-Ulrich Priester