Patents by Inventor Jan Caßens
Jan Caßens 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).
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Patent number: 11472822Abstract: Processes are described for purifying acidic, preferably superacidic, in particular trifluoromethanesulfonic acid-acidified, end-equilibrated acetoxysiloxanes, wherein the acidic, preferably superacidic, in particular trifluoromethanesulfonic acid-acidified, acetic anhydride-containing and optionally acetic acid-containing equilibrated, preferably end-equilibrated acetoxysiloxane, which is optionally dissolved in an inert solvent, is contacted with a base, the precipitate is filtered off thereafter and then the filtrate obtained is optionally purified by distillation.Type: GrantFiled: April 16, 2020Date of Patent: October 18, 2022Assignee: Evonik Operations GmbHInventors: Wilfried Knott, Dagmar Windbiel, Horst Dudzik, Frauke Henning, Jan Caßens
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Patent number: 11370752Abstract: The invention relates to a method for producing cyclododecanone (CDON). During the production, contaminated cyclododecane (CDAN) is produced. This can be separated from CDON by distillation (CDAN-containing fraction). The separation of CDAN and impurities such as 13-oxabicyclo [7.3.1]tridecane occurs by crystallizing out CDAN from the CDAN-containing fraction.Type: GrantFiled: January 31, 2018Date of Patent: June 28, 2022Assignee: Evonik Operations GmbHInventors: Luca Cameretti, Jan Caßens, Ralf Meier
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Patent number: 11286351Abstract: Described is a process for producing preferably trifluoromethanesulfonic acid-acidified, end-equilibrated, acetoxy-bearing siloxanes which comprises reacting cyclic siloxanes, in particular comprising D4 and/or D5, and/or cyclic branched siloxanes of the D/T type with acetic anhydride using preferably trifluoromethanesulfonic acid as catalyst and with addition of acetic acid, wherein the cyclic branched siloxanes of the D/T type are mixtures of cyclic branched siloxanes of the D/T type which contain not only siloxanes comprising D and T units but also siloxanes comprising Q units.Type: GrantFiled: April 15, 2020Date of Patent: March 29, 2022Assignee: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Frauke Henning, Jan Caßens
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Patent number: 11279804Abstract: Branched SiOC-linked polyethersiloxanes have the following formula (I) where R1 is an alkyl radical having 1 to 4 carbon atoms or a phenyl radical, but preferably 90% of the radicals R1 are methyl radicals; b has a value of from 1 to 10; a has a value of from 1 to 200, preferably 10 to 100, a value of from 3 to 70 when b is ?1 and ?4, or a value of from 3 to 30 when b is >4; and R2 denotes identical or different polyether radicals, but at least one radical R2 is a structural element radical of formula (II): where p=at least 2, preferably p=2-6, particularly preferably p=3.Type: GrantFiled: May 26, 2020Date of Patent: March 22, 2022Assignee: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Dagmar Windbiel, Philippe Favresse, Michael Fiedel, André Brötzmann, Frauke Henning, Jan Caßens, Michael Ferenz
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Patent number: 11066429Abstract: Described is a process for producing preferably trifluoromethanesulfonic acid-acidified, end-equilibrated, acetoxy-bearing siloxanes which comprises reacting cyclic siloxanes, in particular comprising D4 and/or D5, and/or cyclic branched siloxanes of the D/T type with acetic anhydride using preferably trifluoromethanesulfonic acid as catalyst and with addition of acetic acid, wherein the cyclic branched siloxanes of the D/T type are mixtures of cyclic branched siloxanes of the D/T type which may contain not only siloxanes comprising D and T units but also siloxanes comprising Q units.Type: GrantFiled: April 17, 2020Date of Patent: July 20, 2021Assignee: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Frauke Henning, Jan Caßens
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Patent number: 11021575Abstract: Described is a process for producing trifluoromethanesulfonic acid-acidified, end-equilibrated, acetoxy-bearing siloxanes which comprises reacting cyclic siloxanes, in particular comprising D4 and/or D5, and/or cyclic branched siloxanes of the D/T type with acetic anhydride using trifluoromethanesulfonic acid as catalyst and with addition of acetic acid.Type: GrantFiled: July 1, 2019Date of Patent: June 1, 2021Assignee: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Frauke Henning, Jan Caßens
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Publication number: 20200377669Abstract: Branched SiOC-linked polyethersiloxanes have the following formula (I) where R1 is an alkyl radical having 1 to 4 carbon atoms or a phenyl radical, but preferably 90% of the radicals R1 are methyl radicals; b has a value of from 1 to 10; a has a value of from 1 to 200, preferably 10 to 100, a value of from 3 to 70 when b is ?1 and ?4, or a value of from 3 to 30 when b is >4; and R2 denotes identical or different polyether radicals, but at least one radical R2 is a structural element radical of formula (II): where p=at least 2, preferably p=2-6, particularly preferably p=3.Type: ApplicationFiled: May 26, 2020Publication date: December 3, 2020Applicant: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Dagmar Windbiel, Philippe Favresse, Michael Fiedel, André Brötzmann, Frauke Henning, Jan Caßens, Michael Ferenz
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Publication number: 20200377665Abstract: Described is a process for producing preferably trifluoromethanesulfonic acid-acidified, end-equilibrated, acetoxy-bearing siloxanes which comprises reacting cyclic siloxanes, in particular comprising D4 and/or D5, and/or cyclic branched siloxanes of the D/T type with acetic anhydride using preferably trifluoromethanesulfonic acid as catalyst and with addition of acetic acid, wherein the cyclic branched siloxanes of the D/T type are mixtures of cyclic branched siloxanes of the D/T type which contain not only siloxanes comprising D and T units but also siloxanes comprising Q units.Type: ApplicationFiled: April 15, 2020Publication date: December 3, 2020Applicant: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Frauke Henning, Jan Caßens
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Publication number: 20200377524Abstract: Processes are described for purifying acidic, preferably superacidic, in particular trifluoromethanesulfonic acid-acidified, end-equilibrated acetoxysiloxanes, wherein the acidic, preferably superacidic, in particular trifluoromethanesulfonic acid-acidified, acetic anhydride-containing and optionally acetic acid-containing equilibrated, preferably end-equilibrated acetoxysiloxane, which is optionally dissolved in an inert solvent, is contacted with a base, the precipitate is filtered off thereafter and then the filtrate obtained is optionally purified by distillation.Type: ApplicationFiled: April 16, 2020Publication date: December 3, 2020Applicant: Evonik Operations GmbHInventors: Wilfried Knott, Dagmar Windbiel, Horst Dudzik, Frauke Henning, Jan Caßens
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Publication number: 20200377526Abstract: Described is a process for producing preferably trifluoromethanesulfonic acid-acidified, end-equilibrated, acetoxy-bearing siloxanes which comprises reacting cyclic siloxanes, in particular comprising D4 and/ or D5, and/or cyclic branched siloxanes of the D/T type with acetic anhydride using preferably trifluoromethanesulfonic acid as catalyst and with addition of acetic acid, wherein the cyclic branched siloxanes of the D/T type are mixtures of cyclic branched siloxanes of the D/T type which may contain not only siloxanes comprising D and T units but also siloxanes comprising Q units.Type: ApplicationFiled: April 17, 2020Publication date: December 3, 2020Applicant: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Frauke Henning, Jan Caßens
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Publication number: 20200055991Abstract: Described is a process for producing trifluoromethanesulfonic acid-acidified, end-equilibrated, acetoxy-bearing siloxanes which comprises reacting cyclic siloxanes, in particular comprising D4 and/or D5, and/or cyclic branched siloxanes of the D/T type with acetic anhydride using trifluoromethanesulfonic acid as catalyst and with addition of acetic acid.Type: ApplicationFiled: July 1, 2019Publication date: February 20, 2020Applicant: Evonik Degussa GmbHInventors: Wilfried Knott, Horst Dudzik, Frauke Henning, Jan Caßens
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Publication number: 20190345101Abstract: The invention relates to a method for producing cyclododecanone (CDON). During the production, contaminated cyclododecane (CDAN) is produced. This can be separated from CDON by distillation (CDAN-containing fraction). The separation of CDAN and impurities such as 13-oxabicyclo [7.3.1]tridacane occurs by crystallizing out CDAN from the CDAN-containing fraction.Type: ApplicationFiled: January 31, 2018Publication date: November 14, 2019Inventors: Luca Cameretti, Jan Caßens, Ralf Meier
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Patent number: 10392340Abstract: The present invention is directed to a process for fine purification of isophoronediamine from the production of isophoronediamine wherein the crude isophoronediamine I is subjected to a fine purification by means of two vacuum distillation columns, wherein I. in the first vacuum distillation column K I low-boiling by-products still present are removed, and a crude IPDA II is transferred from the bottom of K I into the vacuum distillation column K II, II. and in the second vacuum distillation column K II the isophoronediamine is obtained in pure form overhead and separated from the organic residues, wherein the first condenser is a partial condenser and the pure IPDA is removed therein, and wherein the second condenser is a total condenser and the residual portion of the vapor stream from K II is completely condensed therein and recycled as return stream into the first vacuum distillation column K I.Type: GrantFiled: July 6, 2017Date of Patent: August 27, 2019Assignee: Evonik Degussa GmbHInventors: Anne Rittsteiger, Jan Caßens, Axel Hengstermann, Cord Knoop, Anja Müller, Alexander Martin Rüfer
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Patent number: 10093605Abstract: The present invention provides a novel process for producing 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) by catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (?-isophorone) with hydrogen peroxide as the oxidant. In particular, the novel process includes phase transfer reagent in a biphasic system including an organic phase and an aqueous phase wherein the biphasic system includes 1) a tungsten polyoxyometallate as catalyst and hydrogen peroxide, and/or 2) a mixture of a) a mineral acid, b) hydrogen peroxide, and c) a metal tungstate.Type: GrantFiled: November 27, 2017Date of Patent: October 9, 2018Assignee: Evonik Degussa GmbHInventors: Stephanie Bajus, Jan Caßens, Jens Döring, Jörg-Joachim Nitz, Stephan Kohlstruk, Robert Jansen
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Publication number: 20180155264Abstract: The present invention provides a novel process for producing 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) by catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (?-isophorone) with hydrogen peroxide as the oxidant. In particular, the novel process includes phase transfer reagent in a biphasic system including an organic phase and an aqueous phase wherein the biphasic system includes 1) a tungsten polyoxyometallate as catalyst and hydrogen peroxide, and/or 2) a mixture of a) a mineral acid, b) hydrogen peroxide, and c) a metal tungstate.Type: ApplicationFiled: November 27, 2017Publication date: June 7, 2018Inventors: Stephanie Bajus, Jan Caßens, Jens Döring, Jörg-Joachim Nitz, Stephan Kohlstruk, Robert Jansen
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Publication number: 20180029971Abstract: The present invention is directed to a process for fine purification of isophoronediamine from the production of isophoronediamine wherein the crude isophoronediamine I is subjected to a fine purification by means of two vacuum distillation columns, wherein I. in the first vacuum distillation column K I low-boiling by-products still present are removed, and a crude IPDA II is transferred from the bottom of K I into the vacuum distillation column K II, II. and in the second vacuum distillation column K II the isophoronediamine is obtained in pure form overhead and separated from the organic residues, wherein the first condenser is a partial condenser and the pure IPDA is removed therein, and wherein the second condenser is a total condenser and the residual portion of the vapor stream from K II is completely condensed therein and recycled as return stream into the first vacuum distillation column K I.Type: ApplicationFiled: July 6, 2017Publication date: February 1, 2018Inventors: Anne Rittsteiger, Jan Caßens, Axel Hengstermann, Cord Knoop, Anja Müller, Alexander Martin Rüfer
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Patent number: 9878979Abstract: The present invention relates to the fine purification of isophoronenitrile (IPN) by melt crystallization.Type: GrantFiled: November 25, 2016Date of Patent: January 30, 2018Assignee: Evonik Degussa GmbHInventors: Joerg-Joachim Nitz, Stephan Kohlstruk, Robert Jansen, Anja Mueller, Jan Cassens, Axel Hengstermann
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Patent number: 9868699Abstract: Cations are removed from a substance stream that is produced during the production of isophoronenitrile with the help of a cation exchanger.Type: GrantFiled: March 21, 2016Date of Patent: January 16, 2018Assignee: Evonik Degussa GmbHInventors: Joerg-Joachim Nitz, Stephan Kohlstruk, Robert Jansen, Andreas Merkel, Anja Mueller, Jan Cassens, Axel Hengstermann
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Publication number: 20170152217Abstract: The present invention relates to the fine purification of isophoronenitrile (IPN) by melt crystallization.Type: ApplicationFiled: November 25, 2016Publication date: June 1, 2017Applicant: Evonik Degussa GmbHInventors: Joerg-Joachim NITZ, Stephan KOHLSTRUK, Robert JANSEN, Anja MUELLER, Jan CASSENS, Axel HENGSTERMANN
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Publication number: 20160272580Abstract: Cations are removed from a substance stream that is produced during the production of isophoronenitrile with the help of a cation exchanger.Type: ApplicationFiled: March 21, 2016Publication date: September 22, 2016Applicant: Evonik Degussa GmbHInventors: Joerg-Joachim NITZ, Stephan KOHLSTRUK, Robert JANSEN, Andreas MERKEL, Anja MUELLER, Jan CASSENS, Axel HENGSTERMANN