Abstract:
The present invention relates to means and methods for producing an amide compound from a nitrile compound with less acrylic acid as by-product using a Nitrile hydratase (NHase) and Amidase producing microorganism as biocatalyst. Also provided is an aqueous amide compound obtained by the methods of the invention as well as a composition comprising acrylamide or polyacrylamide as well as a dried microorganism exhibiting a NHase/Amidase activity ratio of at least 400 when being brought into contact with a nitrile compound to convert said nitrile compound into an amide compound.
Abstract:
The present invention relates to means and methods for producing an amide compound from a nitrile compound with less acrylic acid as by-product using a Nitrile hydratase (NHase) and Amidase producing microorganism as biocatalyst. Also provided is an aqueous amide compound obtained by the methods of the invention as well as a composition comprising acrylamide or polyacrylamide as well as a dried microorganism exhibiting a NHase/Amidase activity ratio of at least 400 when being brought into contact with a nitrile compound to convert said nitrile compound into an amide compound.
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:
La presente invención se refiere a métodos para preparar una solución acuosa de acrilamida que tiene una baja concentración de ácido acrílico. Asimismo, la presente invención se refiere a métodos para reducir la concentración de ácido acrílico de una solución acuosa de acrilamida. Los métodos incluyen una bioconversión de acrilonitrilo en acrilamida en presencia de un biocatalizador, en donde, durante la bioconversión, el contenido de acrilonitrilo se mantiene a 0,3 % p/p o más con respecto al peso total de la composición en el reactor. También se proporciona una solución acuosa de acrilamida que se obtiene mediante los métodos de la presente invención. Además, la presente invención se refiere a un homopolímero o copolímero de acrilamida que se obtiene mediante polimerización de la acrilamida de la solución acuosa.
Abstract:
processo para preparar soluções aquosas de homo- ou copolímeros de ácido acrílico. a invenção diz respeito a um polímero adesivo sensível a pressão feito de (i) 50-95% em peso de acrilato de n-butila, (ii) 1-20% em peso de acrilato de etila, (iii) 1-20% em peso de acetato de vinila, (iv) 0,1-5% em peso de pelo menos um anidrido ácido insaturado de eitileno, e (v) 0 a 30% em peso de compostos insaturados etilenicamente adicionais dos monômeros (i) a (iv). o polímero adesivo sensível a pressão pode ser usado para produzir artigos auto-adesivos, em particular rótulos de papel ou rótulos de película.
Abstract:
A method for producing bifunctional polyisobutenes, according to which method isobutene or a monomer mixture containing isobutene is polymerized in the presence of a Lewis acid and a compound of formula (I), where X represents an acyl radical or the radical of an organic or inorganic acid group, R
Abstract:
The present invention relates to means and methods for producing an amide compound from a nitrile compound with less acrylic acid as by-product using a Nitrile hydratase (NHase) and Amidase producing microorganism as biocatalyst. Also provided is an aqueous amide compound obtained by the methods of the invention as well as a composition comprising acrylamide or polyacrylamide as well as a dried microorganism exhibiting a NHase/Amidase activity ratio of at least 400 when being brought into contact with a nitrile compound to convert said nitrile compound into an amide compound.
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:
La invención se refiere a un método para producir soluciones acuosas de homo- o copolímeros de ácido acrílico por medio de polimerización radical de ácido acrílico y comonómeros monoetileno insaturados solubles en agua en un medio acuoso en la presencia de por lo menos un iniciador soluble en agua y por lo menos un regulador soluble en agua, en donde la polimerización se realiza por medio de un proceso continuo, y en donde los componentes de bajo peso molecular son por lo menos parcialmente separados de la solución polimérica acuosa obtenida después de la polimerización. Los mezcladores microestructurados y los reactores se utilizan de preferencia para la polimerización. Por lo menos un reactor y/o mezclador que tiene microestructuras se utiliza de preferencia para el proceso.
Abstract:
The invention relates to a method for producing aqueous solutions of homo or copolymers of acrylic acid by means of radical polymerization of acrylic acid and optional water-soluble, monoethylene unsaturated comonomers in an aqueous medium in the presence of at least one water-soluble initiator and at least one water-soluble regulator, wherein the polymerization is performed by means of a continuous process, and wherein low-molecular components are at least partially separated out of the aqueous polymer solution obtained after polymerization. Microstructured mixers and reactors are preferably used for the polymerization. At least one reactor and/or mixer having microstructures are preferably used for the process.