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1. DK0996640 - Fremgangsmåde til fremstilling af cellulosederivater

Office Danemark
Numéro de la demande 98938654
Date de la demande 26.06.1998
Numéro de publication 0996640
Date de publication 11.02.2002
Numéro de délivrance
Date de délivrance 11.02.2002
Type de publication T3
CIB
C08B 1/06
CCHIMIE; MÉTALLURGIE
08COMPOSÉS MACROMOLÉCULAIRES ORGANIQUES; LEUR PRÉPARATION OU LEUR MISE EN UVRE CHIMIQUE; COMPOSITIONS À BASE DE COMPOSÉS MACROMOLÉCULAIRES
BPOLYSACCHARIDES; LEURS DÉRIVÉS
1Traitement préparatoire de la cellulose pour l'obtention de dérivés cellulosiques
06Méthode pour rendre la cellulose apte à l'éthérification
C08B 11/08
CCHIMIE; MÉTALLURGIE
08COMPOSÉS MACROMOLÉCULAIRES ORGANIQUES; LEUR PRÉPARATION OU LEUR MISE EN UVRE CHIMIQUE; COMPOSITIONS À BASE DE COMPOSÉS MACROMOLÉCULAIRES
BPOLYSACCHARIDES; LEURS DÉRIVÉS
11Préparation d'éthers cellulosiques
02Alkyl ou cycloalkyléthers
04à radicaux hydrocarbonés substitués
08à radicaux hydrocarbonés hydroxylés; Leurs esters, éthers ou acétals
CPC
C08B 1/00
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
BPOLYSACCHARIDES; DERIVATIVES THEREOF
1Preparatory treatment of cellulose for making derivatives thereof ; , e.g. pre-treatment, pre-soaking, activation
C08B 11/08
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
BPOLYSACCHARIDES; DERIVATIVES THEREOF
11Preparation of cellulose ethers
02Alkyl or cycloalkyl ethers
04with substituted hydrocarbon radicals
08with hydroxylated hydrocarbon radicals; Esters, ethers, or acetals thereof
C12P 19/14
CCHEMISTRY; METALLURGY
12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
PFERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
19Preparation of compounds containing saccharide radicals
14produced by the action of a carbohydrase ; (EC 3.2.x); , e.g. by alpha-amylase ; , e.g. by cellulase, hemicellulase
Déposants Wolff Walsrode AG
Inventeurs KOCH, Rainhardt
Données relatives à la priorité 19729323 09.07.1997 DE
Titre
(DA) Fremgangsmåde til fremstilling af cellulosederivater
Abrégé
(EN)
According to the invention, samples of highly crystalline ($m(g)80 %) technical cellulose with a degree of polymerisation of approximately 1500 were enzymatically pre-treated with commercial endoglucansases under various conditions before being chemically converted to substituted cellulose derivatives. Said enzymatically pre-treated cellulose samples showed a significantly (up to 222 %) higher degree of substitution compared with control samples which had been pre-treated with buffer without enzymes. The increase in substitution during the chemical reaction was observed in the presence of various quantities of alkali, but decreased with reduced quantities of alkali. It was possible to significantly reduce the quantity of alkali required (by 60 %) and still obtain the same degree of substitution by using the cellulose samples which had been pre-treated with endoglucanase compared with the cellulose samples which had been pre-treated with buffer only. It was also possible to further increase the substitution of the enzymatically pre-treated cellulose samples by reducing the proportion of water in the reaction mixture used in the chemical reaction.