Abstract: A method for preparing a substituted 1,4-quinone methide from a 3,5-disubstituted 4-hydroxybenzaldehyde is provided. Also provided is a method to prepare a 3,5-disubstituted 4-hydroxybenzaldehyde from the corresponding 2,6-disubstituted phenol.
Type:
Grant
Filed:
April 20, 2010
Date of Patent:
July 3, 2012
Assignee:
Evonik Degussa GmbH
Inventors:
Stefanie Rinker, Phillip R. James, Manfred Neumann, Oliver Erpeldinger, Frank Kraushaar
Abstract: Fumed silanized silica with the following physico-chemical data: Grindometer value less than 20 ?m Tamped density 25 to 85 g/l is prepared by grinding fumed silica which has been silanized. It can be used in silicone rubber.
Abstract: Silica glass granule having the following features: Area: 100 to 5000 ?m2, ECD: 5 to 100 ?m, Circumference: 20 to 400 ?m, Maximum diameter: 10 to 140 ?m, Minimum diameter: 5 to 80 ?m, where all values are medium values, Specific BET surface area: <1 m2/g Impurities: <50 ppm It is prepared by a) compacting pyrogenic silicon dioxide powder with a tamped density of 15 to 190 g/l to slugs, b) subsequently crushing them and removing slug fragments with a diameter of <100 ?m and >800 ?m, c) the slug fragments having a tamped density of 300 to 600 g/l, and d) subsequently treating them at 600 to 1100° C. in an atmosphere which comprises one or more compounds which are suitable for removing hydroxyl groups, and e) then sintering them at 1200° C. to 1400° C.
Type:
Grant
Filed:
June 4, 2008
Date of Patent:
July 3, 2012
Assignee:
Evonik Degussa GmbH
Inventors:
Kai Schumacher, Christian Schulze-Isfort, Paul Brandl, Mitsuru Ochiai
Abstract: The invention relates to a method for preparing organic-chemical compounds, characterized in that the following steps are carried out: a) fermentation of a microorganism secreting an L-amino acid, which microorganism contains an overexpressed polynucleotide coding for a polypeptide having polyphosphate-dependent NAD+ kinase activity, in a fermentation medium, to form a fermentation broth, b) accumulation of said compound in said fermentation broth and/or in the cells of said microorganism. The invention relates to a method for preparing organic-chemical compounds by fermentation of a microorganism in which a polypeptide having polyphosphate-dependent NAD+ kinase is overexpressed.
Type:
Application
Filed:
June 18, 2010
Publication date:
June 28, 2012
Applicant:
EVONIK DEGUSSA GMBH
Inventors:
Volker F. Wendisch, Steffen Lindner, Brigitte Bathe, Wilfried Claes
Abstract: A process for preparing methylmercaptopropionaldehyde in a single reaction unit, is provided. According to the preferred embodiment, the process comprises, simultaneously contacting a gaseous mixture comprising acrolein with a liquid mixture comprising methylmercaptopropionaldehyde, methyl mercaptan, a catalyst and methylmercaptopropionaldehyde methyl thiohemiacetal in the reactive absorber; absorbing the acrolein from the gaseous mixture into the liquid mixture; reacting the absorbed acrolein with the methyl mercaptan or the methylmercaptopropionaldehyde methyl thiohemiacetal to obtain methylmercapto-propionaldehyde; removing gaseous impurities and by-products from the liquid mixture; and separating the obtained methylmercaptopropionaldehyde product from the reactive absorber, directing a portion of the separated product to storage or further processing and recycling the remaining portion to the reactive absorber; wherein the methyl mercaptan optionally comprises dimethyl sulfide or dimethyl ether.
Type:
Application
Filed:
December 27, 2011
Publication date:
June 28, 2012
Applicant:
EVONIK DEGUSSA GmbH
Inventors:
Caspar Heinrich FINKELDEI, Pablo Zacchi, Benjamin Fonfe, Stephan Kretz, Martin Koerfer, Hans Joachim Hasselbach, Wolfgang Boeck
Abstract: The invention relates to a hydrophobic fumed silica which is obtained by grinding a fumed silica which, as a result of silanization, has trimethylsilyl groups fixed on the surface; and to coating formulations comprising this silica.
Type:
Application
Filed:
March 1, 2012
Publication date:
June 21, 2012
Applicant:
EVONIK DEGUSSA GmbH
Inventors:
Jürgen MEYER, Kurt Spitznagel, Günther Michael, Tina Gross
Abstract: Process for the infiltration of porous ceramic components, in which a dispersion containing metal oxide particles and having a metal oxide content of at least 30% by weight, based on the dispersion, is used, where the particle size distribution d50 of the metal oxide particles is not more than 200 nm.
Type:
Application
Filed:
September 15, 2010
Publication date:
June 21, 2012
Applicant:
Evonik Degussa GmbH
Inventors:
Christoph Tontrup, Wolfgang Lortz, Gabriele Perlet
Abstract: The invention relates to a process for producing nanostructured silicon-carbon composites, comprising the (A) introduction of at least one of components (a1) mono- and/or polyhydroxyaromatic compound, and (a2) an aldehyde, and (a3) a catalyst, into a reactor to obtain a composition in which the components react with one another in the presence of the catalyst at a reaction temperature T of 75 to 200° C., and at a pressure of 80 to 2400 kPa, and over a period to of 0.
Type:
Application
Filed:
May 18, 2010
Publication date:
June 21, 2012
Applicant:
Evonik Degussa GmbH
Inventors:
Arkadi Maisels, Yves Gorat Stommel, Frank Stenger, Martin Miessen, Jutta Zimmermann, Manfred Dannehl, Peter Pilgram
Abstract: An isolated polynucleotide encodes a polypeptide comprising the amino acid sequence of SEQ ID NO: 2, with the L-aspartic acid at position 5 of the amino acid sequence replaced by another proteinogenic amino acid, and possesses citrate synthase activity. In addition, a vector comprises the polynucleotide and a bacterium comprises the vector. An isolated polynucleotide comprises a nucleotide sequence comprising, from position 1 to 39, the nucleotide sequence corresponding to position 1 to 39 of SEQ ID NO: 11, from position 40 to 105, a nucleotide sequence encoding the amino acid sequence of SEQ ID NO: 12, with each proteinogenic amino acid except L-aspartic acid being present at position 5. A method of producing an L-amino acids is also described.
Abstract: The invention is directed to an improved, reliably performable process for preparing triallyl isocyanurate (TAIC) by Cu2+-catalysed rearrangement of triallyl cyanurate (TAC) at at least 90° C. According to the invention, TAC and, if required, also a Cu2+ catalyst and solvent are fed continuously to a start reaction mixture after onset of the initially inhibited isomerization reaction, the isomerization is performed at from 90 to 160° C. and an amount of reaction mixture equivalent to the amount of reactant is drawn off continuously and sent to the workup. Preference is given to effecting the isomerization in TAIC as the reaction medium.
Type:
Grant
Filed:
June 14, 2007
Date of Patent:
June 12, 2012
Assignee:
Evonik Degussa GmbH
Inventors:
Peter Werle, Hans-Peter Krimmer, Manfred Schmidt, Klaus Stadtmueller, Martin Trageser
Abstract: Aluminum oxide powder in the form of aggregates of primary-particles, which has a BET surface area of from 10 to 90 m2/g and comprises as crystalline phases, in addition to gamma-aluminum oxide and/or theta-aluminum oxide, at least 30% of delta-aluminum oxide. It is prepared by vaporizing aluminum chloride and burning the vapor together with hydrogen and air, the ratio of primary air/secondary air being 0.01 to 2, the exit speed vB of the reaction mixture from the burner being at least 10 m/s, the lambda value being 1 to 4, the gamma value being 1 to 3 and the value of gamma*vB/lambda being greater than or equal to 55. Dispersion comprising the aluminum oxide powder. Coating composition comprising the dispersion.
Type:
Grant
Filed:
December 20, 2005
Date of Patent:
June 12, 2012
Assignee:
Evonik Degussa GmbH
Inventors:
Kai Schumacher, Martin Moerters, Juergen Flesch, Marcus Von Twistern, Volker Hamm, Matthias Schmitt, Harald Alff, Roland Schilling
Abstract: Methods and systems for enhancing fluidization of nanoparticle and/or nanoagglomerates and for mixing and blending nanoparticle/nanoagglomerate systems at the nanoscale are provided. A fluidization chamber is provided with a fluidizing medium (e.g., a fluidizing gas) directed in a first fluidizing direction, e.g., upward into and through a bed containing a volume of nanoparticles and/or nanopowders. A second source of air/gas flow is provided with respect to the fluidization chamber, the secondary air/gas flow generally being oppositely (or substantially oppositely) directed relative to the fluidizing medium. Turbulence created by the secondary gas flow, e.g., a jet from a micro jet nozzle, is advantageously effective to aerate the agglomerates and the shear generated by the jet is advantageously effective to break apart nanoagglomerates and/or reduce the tendency for nanoagglomerates to form or reform.
Type:
Application
Filed:
November 9, 2007
Publication date:
June 7, 2012
Applicants:
EVONIK DEGUSSA GMBH, NEW JERSEY INSTITUTE OF TECHNOLOGY
Inventors:
Robert Pfeffer, Jose A. Quevedo, Juergen Flesch
Abstract: The present invention relates to a composite material based on (a) a cellulose- or lignocellulose-containing material and (b) a composite as a binder, the composite resulting from the reaction of at least the components (i) a glycidyloxypropylalkoxysilane, (ii) an aqueous silica sol having a solids content of >20% by weight, (iii) an organic acid as a hydrolysis catalyst and (iv) n-propyl zirconate, butyl titanate or titanium acetylacetonate as a crosslinking agent. The present invention furthermore relates to a process for the production of said composite materials and the use of a composite (b) as a binder for the production of wood-based materials.
Type:
Grant
Filed:
June 14, 2006
Date of Patent:
May 29, 2012
Assignee:
Evonik Degussa GmbH
Inventors:
Roland Edelmann, Burkhard Standke, Peter Jenkner, Alireza Kharazipour, Lars Kloeser, Jaroslaw Monkiewicz
Abstract: Composite material comprising—one or more heat-activatable free-radical initiators selected from the group consisting of organic peroxides and/or initiators having labile carbon-carbon bonds and particles which have a core-shell structure and the core of which comprises one or more magnetic materials, while the shell comprises silicon dioxide.
Type:
Application
Filed:
May 28, 2010
Publication date:
May 24, 2012
Applicants:
UNITED INITIATORS GMBH & CO. KG, EVONIK DEGUSSA GMBH
Inventors:
Harald Herzog, Konrad Rockstein, Stipan Katusic, Martin Kunz, Iris Nagl, Hanno Wolf
Abstract: The present invention relates to novel transition metal complexes of the formula (I) to a process for preparing these transition metal complexes and to the use of the transition metal complexes as catalysts in metathesis reactions.
Type:
Grant
Filed:
April 24, 2008
Date of Patent:
May 22, 2012
Assignee:
Evonik Degussa GmbH
Inventors:
Renat Kadyrov, Anna Szadkowska, Karol Grela, Michal Barbasiewicz
Abstract: Process for the continuous preparation of prepolymers based on phenolic resin, an oxazoline component and an epoxide in the presence of a catalyst, including supplying the phenolic resin and the oxazoline component to an extruder in a stream A; a Lewis adduct of boron trifluoride or of aluminium trichloride, or arylsulphonic acids or alkylsulphonic acids, or latent arylsulphonic acids or latent alkylsulphonic acids, in a stream B, and the epoxide in a stream C, the infeed of stream A being situated, as seen in extrusion direction, before the infeed of stream C, these reactants are mixed at a reaction temperature of 120 to 200° C. with a residence time in the extruder of 3 seconds to 15 minutes, and then the product discharge of the extruder is cooled to a temperature of less than 45° C. within from 30 to 60 seconds.
Type:
Application
Filed:
November 16, 2011
Publication date:
May 17, 2012
Applicant:
EVONIK DEGUSSA GmbH
Inventors:
Marianne OMEIS, Franz-Albert von Itter, Thomas Weihrauch
Abstract: The present invention is directed to methods for flameproofing cellulose fibres and articles containing these fibres. The method involves treatment of materials with cyanuric chloride.
Type:
Grant
Filed:
September 20, 2002
Date of Patent:
May 15, 2012
Assignee:
Evonik Degussa GmbH
Inventors:
Manfred Schmidt, Stephanie Schauhoff, Frank Gähr
Abstract: The present invention relates to a preparation comprising at least one specific oligomeric siloxane component and at least one polymer component, to processes for producing it and to its use in formulations, more particularly metal coating formulations.
Type:
Grant
Filed:
July 8, 2008
Date of Patent:
May 15, 2012
Assignee:
Evonik Degussa GmbH
Inventors:
Rene Koschabek, Martin Bartmann, Thorsten Brand, Burkhard Standke, Roland Edelmann, Christian Wassmer
Abstract: Dispersion containing pyrogenic silicon-titanium mixed oxide powders with a silicon dioxide content of 75 to 99.99 wt.-% and a titanium dioxide content of 0.01 to 25 wt. %, water and a basic, quaternary ammonium compound, wherein the mean aggregate diameter of the particles of the silicon-titanium mixed oxide powder in the dispersion is 200 nm at most. Process for the production of a titanium-containing zeolite with the use of the dispersion.