Abstract: The present invention relates to a process for production of (meth)acrylic acid, whereby first a crude (meth)acrylic acid is produced and this crude (meth)acrylic acid is then continuously purified, whereby the continuous purification of the crude (meth)acrylic acid comprises the following process steps: a) in a composition comprising (meth)acrylic acid and impurities, precipitating the impurities in crystalline form from the composition; and b) separating the crystalline impurities precipitated from the composition. The invention also relates to the (meth)acrylic acid obtainable by this process, a device for production of (meth)acrylic acid, the use of the device or of a purification device for production of (meth)acrylic acid, (meth)acrylic acid, water-absorbing polymers, the use of water-absorbing polymers as well as fibers, sheets, foams and composites.
Type:
Grant
Filed:
July 15, 2005
Date of Patent:
July 7, 2009
Assignee:
Evonik Stockhausen GmbH
Inventors:
Stefan Nordhoff, Torsten Balduf, Jürgen Mosler, Wilfried Uhlich, Dennis Thong Yu-Chiang, Axel Kobus, Arndt Selbach, Jürgen Kohn
Abstract: The invention relates to a method for the accelerated dehydration of sludges in sludge disposal areas, especially of sludges from rivers and harbors, by the exclusive use of anionic polymer flocculants and the use of materials obtained according to the inventive method.
Type:
Grant
Filed:
May 28, 2004
Date of Patent:
June 30, 2009
Assignees:
Stockhausen GmbH & Co. KG, Detlef Hegemann GmbH & Co KG
Inventors:
Thorsten Buddenberg, Holger Herrmann, Hartmut Pawel, Otto Schroers, Wolfgang Hoeppner, Volker Hartmann
Abstract: A process for producing an absorbent polymer including a first mixing event, in which a plurality of absorbent polymer particles (1) are mixed with a liquid (2) and a second mixing event, in which the liquid (2) is homogenized within the interior of the polymer particles. The polymer particles (1) in the first mixing event are mixed with a speed such that the kinetic energy of the individual polymer particles (1) is on average larger than the adhesion energy of the individual polymer particles (1), and the polymer particles (1) in the second mixing event are stirred at a lower speed than in the first mixing event. The different speeds effect a fluidization of the polymer particles (1), which prevents a clumping of the polymer particles (1) during the mixing event. The absorbent polymers thus produced are distinguished by a particularly rapid swelling behavior.
Type:
Grant
Filed:
October 24, 2003
Date of Patent:
June 2, 2009
Assignee:
Evonik Stockhausen GmbH
Inventors:
Armin Reimann, Manfred Van Stiphoudt, Herbert Vorholt
Abstract: The present invention relates to a pulverulent polymer post-crosslinked on the surface and absorbing water or aqueous liquids, synthesised from polymerised, optionally pre-crosslinked monomers containing partially neutralised carboxyl groups. The present invention also relates to a process for the post-treatment of the aforementioned polymers and the use of a solution of at least one salt of an at least trivalent cation for restoring the gel permeability of the aforementioned polymers that have been damaged by mechanical action.
Abstract: The invention concerns a process for purification of an acidic monomer having a double bond, as well as a device for synthesis of an acidic monomer having a double bond, a process for producing an acidic monomer having a double bond, an acid monomer having a double bond and obtainable by this process, fibers, formed bodies, films, foams, superabsorbent polymers and other special polymers based on or containing this acidic monomer, the use of this acidic monomer in or for producing fibers, formed bodies, films, foams, superabsorbent polymers or other special polymers.
Type:
Grant
Filed:
January 13, 2004
Date of Patent:
February 24, 2009
Assignee:
Evonik Stockhausen GmbH
Inventors:
Torsten Balduf, Stefan Nordhoff, Dennis Thong Yu-Chiang, Axel Kobus, Martin Roos
Abstract: An absorbent cellulose material having an application of superabsorbent polymer adhered to the cellulose material. In particular, the cellulose material has an application of pre-superabsorbent polymer adhered to the material, wherein an aqueous solution of pre-superabsorbent polymer is applied to the cellulose material and converted to superabsorbent polymer upon subjected to heat for a sufficient time. The absorbent cellulose material has a fluid retention of greater then 2 g/g.
Type:
Grant
Filed:
August 20, 2004
Date of Patent:
January 27, 2009
Assignee:
Evonik Stockhausen GmbH
Inventors:
Iqbal Ahmed, Angela Marie Jones, Scott J. Smith
Abstract: The invention relates to a method of producing an abrasive substance, where natural kernels, shells, fruit skins and/or seeds are ground to give a flour of defined particle size, the flour is treated in aqueous suspension with at least one bleaching agent, in which the addition of the bleaching agent takes place in two steps, where, in the first step, at least 40% by weight to 90% by weight of the total amount of bleaching agent is added and the flour is sterilized in the acidic medium and, in the second step, the lightening and degreasing of the flour is brought about by the simultaneous metered addition of the remainder of the bleaching agent with an alkali solution in alkaline medium, and its use in cosmetic preparations.
Abstract: A process for producing an absorbing polymer structure (Pa) including the steps of obtaining a treated absorbing polymer structure (Pb) by increasing the absorption under load at a load of 0.3 or 0.9 psi (AUL) compared to an untreated absorbing polymer structure (Pu) by a first treatment of an outer region of the untreated absorbing polymer structure (Pu) and reducing the AUL compared to the treated polymer structure (Pb) by a second treatment of an outer region of the treated absorbing polymer structure (Pb). Such absorbing polymer structure (Pa) may be used in a composite and may be used in foams, moulded articles, fibers, sheets, films, cables, sealing materials, liquid-absorbing hygiene articles, carriers for plant growth-regulating and fungal growth-regulating agents, packaging materials and soil additives or building materials.
Type:
Grant
Filed:
June 21, 2007
Date of Patent:
September 23, 2008
Assignee:
Stockhausen GmbH
Inventors:
Scott Smith, Bernfried Messner, Markus Frank
Abstract: The invention relates to a process for the production of water-soluble or water-swellable polymers having a low content of residual monomers, particularly on the basis of acrylic acid and/or acrylamide and at least one additional water-soluble comonomer, in which process a monomer solution in a polymerizing state is treated with electromagnetic radiation at the earliest after reaching the maximum temperature of polymerization, and the gel obtained is subsequently crushed and dried, and it also relates to the water-soluble or water-swellable polymers as such, which can be obtained according to said process, to their use in the hygiene industry, packaging industry, in the agrarian technology or in agriculture and horticulture, in the cable industry and information technology, in the food industry, papermaking industry, and to their use as flocculation aids and as drilling fluid in petroleum production.
Type:
Application
Filed:
January 16, 2006
Publication date:
August 21, 2008
Applicant:
Stockhausen GmbH
Inventors:
Gregor Herth, Manfred Dannehl, Norbert Steiner
Abstract: The invention describes supersuperabsorbent polymers composed of surface-post crosslinked polycarboxypolysaccharides having excellent age-stable absorption properties, even under load, high attrition resistance and biodegradability and their use for absorbing water, aqueous or serous fluids and also blood. Also disclosed is a method of making which is impervious to changes in raw material quality and which provides consistent product quality.
Abstract: The present invention relates to a process for production of (meth)acrylic acid, whereby first a crude (meth)acrylic acid is produced and this crude (meth)acrylic acid is then continuously purified, whereby the continuous purification of the crude (meth)acrylic acid comprises the following process steps: a) in a composition comprising (meth)acrylic acid and impurities, precipitating the impurities in crystalline form from the composition; and b) separating the crystalline impurities precipitated from the composition. The invention also relates to the (meth)acrylic acid obtainable by this process, a device for production of (meth)acrylic acid, the use of the device or of a purification device for production of (meth)acrylic acid, (meth)acrylic acid, water-absorbing polymers, the use of water-absorbing polymers as well as fibers, sheets, foams and composites.
Type:
Application
Filed:
July 15, 2005
Publication date:
April 17, 2008
Applicant:
STOCKHAUSEN GMBH
Inventors:
Stefan Nordhoff, Torsten Balduf, Jurgen Mosler, Wilfired Uhlich, Dennis Thong Yu-Chiang, Axel Kobus, Arndt Selbach, Jurgen Kohn
Abstract: The process according to the invention for production of an absorbent polymer comprising the following process steps: i) polymerization of an aqueous monomer solution to obtain a polymer gel; ii) comminution of the polymer gel to obtain a gel granulate; and iii) drying of the gel granulate, and is characterized in that the gel granulate after step ii) has a spread behavior. The production process of an absorbent polymer distinguishes itself by a particularly efficient drying step iii), which enables a particularly gentle and uniform drying of the gel granulate. The obtained absorbent polymers and products and items produced therefrom have a particularly uniform product quality and constant physical-chemical properties.
Abstract: The present invention relates to a process for the production of acrylic acid (AA) comprising the steps wherein: a) a 1st gas mixture comprising propylene, oxygen, an inert gas and steam is subjected to a 1st catalytic oxidation reaction stage thereby converting the propylene in the presence of a catalyst mainly into acrolein being contained in a 2nd gas mixture from said 1st catalytic oxidation reaction, b) said 2nd gas mixture from the 1st catalytic oxidation reaction stage is subjected to a 2nd catalytic oxidation reaction stage thereby converting the acrolein in the presence of a catalyst mainly into AA, being contained in a product gas, c) said product gas is subjected to a quench tower, wherein said AA is recovered as an aqueous solution comprising said AA being contained in the process water, wherein a process vent gas is obtained at the top of said quench tower, wherein, said 1st gas mixture has a steam/propylene ratio of >0.
Type:
Grant
Filed:
December 13, 2002
Date of Patent:
November 13, 2007
Assignee:
Stockhausen GmbH
Inventors:
Gunther Bub, Jurgen Mosler, Dietrich Maschmeyer, Andreas Sabbagh, Roland Fornika, Matthias Peuckert
Abstract: The invention relates to absorbent, cross-linked polymers based on partially neutralized, monoethylenically unsaturated monomers that bear acidic groups. Said polymers exhibit improved properties with regard to their ability to transport liquids in a swollen state. The surface of the polymers is postreticulated, using a combination of an organic cross-linking compound, excluding polyols, and a cation that is in salt form in an aqueous solution.
Abstract: A process for producing an absorbing polymer structure (Pa) including the steps of obtaining a treated absorbing polymer structure (Pb) by increasing the absorption under load at a load of 0.3 or 0.9 psi (AUL) compared to an untreated absorbing polymer structure (Pu) by a first treatment of an outer region of the untreated absorbing polymer structure (Pu) and reducing the AUL compared to the treated polymer structure (Pb) by a second treatment of an outer region of the treated absorbing polymer structure (Pb). Such absorbing polymer structure (Pa) may be used in a composite and may be used in foams, moulded articles, fibers, sheets, films, cables, sealing materials, liquid-absorbing hygiene articles, carriers for plant growth-regulating and fungal growth-regulating agents, packaging materials and soil additives or building materials.
Type:
Grant
Filed:
April 30, 2003
Date of Patent:
July 10, 2007
Assignee:
Stockhausen GmbH
Inventors:
Scott Smith, Bernfried Messner, Markus Frank
Abstract: Random three- and four-amino acid copolymers having lengths of 14-, 35- and 50-amino acid residues are provided. Fifty-mers of FEAK were effective inhibitors of MBP 85-99 or proteolipid protein (PLP) 40–60-specific HLA-DR-2-restricted T cell clones. These copolymers efficiently suppressed EAE induced in susceptible SJL/J (H-2s) strain of mice with either whole spinal cord homogenate (WSCH) or with the encephalitogenic epitope PLP 139-151. YFAK 50-mer having a molar ratio of about y 0.8:F 0.2 inhibited binding of biotinylated MBP 85-99 epitope to HLA-DR-2 molecules more efficiently than either unlabeled MBP 85-99 or Copaxone®. YFAK and FAK copolymers efficiently suppressed EAE induced in SJL/J (H-2s) mice with the encephalitogenic epitope PLP 139-151.
Type:
Grant
Filed:
September 20, 2001
Date of Patent:
July 10, 2007
Assignee:
Stockhausen GmbH & Co. KG
Inventors:
Marcel Veeger, Andreas Klotz, Gerda Maehse, Beatrice Haeusler, Karin Faensen
Abstract: The invention relates to a method for the accelerated dehydration of sludges in sludge disposal areas, especially of sludges from rivers and harbors, by the exclusive use of anionic polymer flocculants and the use of materials obtained according to the inventive method.
Abstract: A water-absorbing composition, a process for producing a water-absorbing composition, a composite comprising a water-absorbing composition, and the use of a water-absorbing composition for releasing an active substance (e.g., a wound treatment substance, a care substance, or combinations thereof) are disclosed. A water-absorbing composition can include active substance-doped water-absorbing polymer particles comprising: ?1.) an active substance in a quantity in the range from about 0.001 to about 30 wt. %; and ?2.) an absorber matrix in a quantity in the range from about 70 to about 99.999 wt. %. Also, a hygiene article and a wound treatment means, including a water-absorbing composition, are disclosed.
Type:
Application
Filed:
July 1, 2004
Publication date:
March 22, 2007
Applicant:
STOCKHAUSEN GMBH
Inventors:
Jorg Harren, Ursula Nielinger, Dieter Oppenberg, Harald Schmidt