Abstract:
Verfahren zur Herstellung von Polymeren durch kontrollierte radikalische Polymerisation, wobei die Polymerisation eines oder mehrerer radikalisch polymerisierbarer Momomere der allgemeinen Formel (I) mit R 1 , R 2 , R 3 H, C 1 -C 4 -Alkyl, R 4 C(=0)OR 5 , C(=0)NHR 15 , C(=0)NR 5 R 6 , OC(=0)CH 3 , C(=0)OH, CN, Aryl, Hetaryl, C(=0)OR 5 OH, C(=0)OR 5 Si(OR 5 ) 3 , Halogen, NHC(0)H, P(=0)(OR 7 ) 2 , R 5 C 1 -C 20 -Alkyl, R 15 C 1 -C 20 -Alkyl, R 6 C 1 -C 20 -Alkyl, R 7 H, C 1 -C 20 -Alkyl, in Gegenwart a. eines oder mehrerer Katalysatoren enthaltend Cu in Form von Cu(0), Cu(l), Cu (II) oder Mischungen aus diesen, b. eines oder mehrerer Initiatoren gewählt aus der Gruppe der organischen Halogenide oder Pseudohalogenide, c. eines oder mehrer Liganden, d. optional eines oder mehrer Lösungsmittel, e. optional eines oder mehrerer anorganischer Halogenidsalze, erfolgt, umfassend die Schritte i) Zugabe des Katalysators a., ii) optional Zugabe von Monomeren der allgemeinen Formel (I), iii) optional Zugabe von Lösungsmittel d., iv) Zugabe von Ligand c, v) Zugabe von Initiator b., vi) Zugabe von Monomeren der allgemeinen Formel (I), vii) optional Zugabe anorganischer Halogenidsalze e., unter der Maßgabe, dass die Zugabe zumindest eines Teiles der Monomeren der allgemeinen Formel (I) unmittelbar vor oder kurz nach dem letzten der Schritte i), iv) und v) erfolgt.
Abstract:
Verfahren zur Herstellung von wässrigen Lösungen von Homo- oder Copolymeren der Acrylsäure mittels radikalischer Polymerisation von Acrylsäure sowie optional wasserlöslichen, monoethylenisch ungesättigten Comonomeren in wässrigem Medium in Gegenwart mindestens eines wasserlöslichen Initiators und mindestens eines wasserlöslichen Reglers, wobei man die Polymerisation mittels eines kontinuierlichen Verfahrens vornimmt, und wobei man nach der Polymerisation niedermolekulare Komponenten aus der erhaltenen, wässrigen Polymerlösung zumindest teilweise abtrennt. Zur Polymerisation werden bevorzugt mikrostrukturierte Mischer und Reaktoren eingesetzt. Bevorzugt verwendet man für das Verfahren zumindest einen Reaktor und/oder Mischer mit Mikrostrukturen.
Abstract:
The present invention relates to methods for preparing an aqueous acrylamide solution having a low acrylic acid concentration. In addition, the present invention relates to methods for reducing the acrylic acid concentration of an aqueous acrylamide solution. The methods involve a bioconversion of acrylonitrile to acrylamide in the presence of a biocatalyst, wherein during the bioconversion the content of acrylonitrile is maintained at 0.3 w/w % or more referred to the total weight of the composition in the reactor. Also provided is an aqueous acrylamide solution which is obtained by the methods of the present invention. Furthermore, the present invention is related to an acrylamide homopolymer or copolymer obtained by polymerizing the acrylamide of the aqueous solution.
Abstract:
Herstellung von bifunktionellen Polyisobutenen, bei dem man Isobuten oder ein Isobutenhaltiges Monomerengemisch in Gegenwart einer Lewis-Säure und einer Verbindung der Formel (I), worin X für einen Acylrest oder den Rest einer organischen oder anorganischen Säuregruppe steht, R 1 bis R 4 gleich oder verschieden sind und für Wasserstoff oder einen Kohlenwasserstoffrest stehen, polymerisiert.
Abstract:
The present disclosure relates to methods for producing an amide compound from a nitrile compound using a dried biocatalyst which has been pre-treated with a buffer, wherein the dried and pre-treated biocatalyst has improved properties as compared to a dried biocatalyst which has not been pre-treated with a buffer. In particular, the present disclosure provides means and methods to enhance the NHase activity of a dried biocatalyst for use in the production of amide compounds from nitrile compounds in aqueous solutions thereby improving the bioconversion process.
Abstract:
The present invention relates to a continuous process for the production of polymeric coupling products by using a reactor assembly which is equipped with two or more reaction cells. The educt fluid is pumped through the reaction cells and thoroughly mixed therein by means of agitators. Preferably the process according to the invention is used for the preparation of coupling products which show at least partially precipitation and/or gelation effects during the performance of the synthesis. The precipitation and/or gelation effects are associated with and increase of the viscosity of the reaction system under reaction conditions. The products which are obtained by the process according to the invention have increased molecular weight and low polydispersity over similar products which were obtained in batch experiments.
Abstract:
The invention provides a method for preparing an aqueous (meth)acrylamide solution, said method comprising the following steps: (a) adding the following components (i) to (iii) to a reactor to obtain a composition for bioconversion: (i) a biocatalyst capable of converting (meth) acrylonitrile to (meth) acrylamide; (ii) (meth) acrylonitrile; and (iii) water; (b) performing a bioconversion on the composition obtained in step (a) as a reaction mixture in the reactor to obtain a crude aqueous (meth) acrylamide solution; and (c) passing the crude aqueous solution through at least one filter to provide a purified aqueous (meth) acrylamide solution, wherein at least one filter of step (c) has a nominal retention rating, with at least 90% efficiency, of from 4 to 22 μm. The invention further provides an apparatus for manufacturing aqueous (meth) acrylamide solution according to the inventive method. The method comprises a bioconversion unit; a supply of (meth) acrylonitrile; a supply of biocatalyst; and a supply of water. The apparatus comprises at least one filter for purifying crude aqueous (meth) acrylamide solution, which at least one filter has a nominal retention rating, with at least 90% efficiency, of 4 to 22 μm. The invention also covers aqueous (meth) acrylamide solution obtainable by the aforesaid inventive method, polymers made therefrom, and the use of aqueous solutions of said polymers for mining applications or oil field applications.
Abstract:
The present invention relates to methods for preparing aqueous acrylamide solutions having a low acrylic acid concentration, aqueous acrylamide solutions obtainable by such methods, and acrylamide homopolymers or copolymers obtainable by polymerizing such acrylamide. In addition, the present invention is also directed to methods for reducing the acrylic acid concentration of aqueous acrylamide solutions. The invention furthermore relates to a modular, relocatable bioconversion unit for manufacturing aqueous acrylamide solutions.
Abstract:
The present invention relates to methods for preparing an aqueous acrylamide solution having a low acrylic acid concentration. In addition, the present invention relates to methods for reducing the acrylic acid concentration of an aqueous acrylamide solution. The methods involve a bioconversion of acrylonitrile to acrylamide in the presence of a biocatalyst. In these methods a biocatalyst is employed which is contacted with urea. Also provided is an aqueous acrylamide solution which is obtained by the methods of the present invention. Furthermore, the present invention is related to an acrylamide homopolymer or copolymer obtained by polymerizing the acrylamide of the aqueous solution. The present invention also relates to the use of urea in the preparation of an aqueous acrylamide solution by a bio-based process where acrylonitrile is converted to acrylamide using a biocatalyst.
Abstract:
The present invention relates to methods for producing acrylamide from acrylonitrile in an aqueous solution with a Nitrile hydratase (NHase) producing microorganism in the presence of a saccharide. The present invention further relates to methods for reducing the amount of acrylic acid which is generated while producing acrylamide from acrylonitrile in an aqueous solution with the help of microorganisms. The methods of the present invention are further capable of reducing the reaction time necessary to convert acrylonitrile into acrylamide with a Nitrile hydratase (NHase) producing microorganism in an aqueous solution and of increasing the reaction rate of acrylonitrile into acrylamide mediated by a Nitrile hydratase (NHase) producing microorganism in an aqueous solution.