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1. GB2036826 - PROCESS ALLOWING THE DELIGNIFICATION AND THE TRANSFORMATION INTO SUGAR OF LIGNOCELLULOSE VEGETAL MATERIALS BY USING ORGANIC SOLVENTS

Office
Royaume-Uni
Numéro de la demande 7914398
Date de la demande 31.08.1978
Numéro de publication 2036826
Date de publication 02.07.1980
Type de publication A
CIB
C07D 307/50
CCHIMIE; MÉTALLURGIE
07CHIMIE ORGANIQUE
DCOMPOSÉS HÉTÉROCYCLIQUES
307Composés hétérocycliques contenant des cycles à cinq chaînons comportant un atome d'oxygène comme unique hétéro-atome du cycle
02non condensés avec d'autres cycles
34comportant deux ou trois liaisons doubles entre chaînons cycliques ou entre chaînons cycliques et chaînons non cycliques
38avec des radicaux hydrocarbonés substitués liés aux atomes de carbone du cycle
40Radicaux substitués par des atomes d'oxygène
46Atomes d'oxygène liés par des liaisons doubles ou deux atomes d'oxygène liés par des liaisons simples au même atome de carbone
48Furfural
50Préparation à partir de produits naturels
C13K 1/02
CCHIMIE; MÉTALLURGIE
13INDUSTRIE DU SUCRE
KSACCHARIDES, AUTRES QUE LE SACCHAROSE, OBTENUS À PARTIR DE SOURCES NATURELLES OU PAR HYDROLYSE DE DI-, OLIGO- OU POLYSACCHARIDES PRÉSENTS DANS LA NATURE
1Glucose; Sirops glucosés
02obtenus par saccharification de matières cellulosiques
D21C 3/20
DTEXTILES; PAPIER
21FABRICATION DU PAPIER; PRODUCTION DE LA CELLULOSE
CPRODUCTION DE LA CELLULOSE PAR ÉLIMINATION DES SUBSTANCES NON CELLULOSIQUES DES MATIÈRES CONTENANT DE LA CELLULOSE; RÉGÉNÉRATION DES LIQUEURS NOIRES; APPAREILS À CET EFFET
3Réduction en pâte des matières contenant de la cellulose
20avec des solvants organiques
CPC
C07D 307/50
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
DHETEROCYCLIC COMPOUNDS
307Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
02not condensed with other rings
34having two or three double bonds between ring members or between ring members and non-ring members
38with substituted hydrocarbon radicals attached to ring carbon atoms
40Radicals substituted by oxygen atoms
46Doubly bound oxygen atoms, or two oxygen atoms singly bound to the same carbon atom
48Furfural
50Preparation from natural products
C13K 1/02
CCHEMISTRY; METALLURGY
13SUGAR INDUSTRY
KSACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES
1Glucose
02obtained by saccharification of cellulosic materials
D21C 3/20
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
3Pulping cellulose-containing materials
20with organic solvents ; or in solvent environment
Déposants THERMOFORM BAU FORSCHUNG
Données relatives à la priorité 285821 31.08.1977 CA
93242178 11.08.1978 US
Titre
(EN) PROCESS ALLOWING THE DELIGNIFICATION AND THE TRANSFORMATION INTO SUGAR OF LIGNOCELLULOSE VEGETAL MATERIALS BY USING ORGANIC SOLVENTS
Abrégé
(EN) Minced lignocellulose, such as wood, straw, bamboos, bagasse or any other structured vegetal material, is treated in a discontinuous or continuous process. The process consists in boiling this material in an acidified mixture of solvents in an aqueous phase. This mixture of solvents contains water in a proportion of 30 to 70 parts and an organic solvent in a proportion of 70 to 30 parts. The organic solvent consists of either an alcohol of light molecular weight, or a ketone of light molecular weight; it must be easily evaporable and soluble in water. The pH of the medium is adjusted to a pH from 3.5 to 1.7 by adding a catalytic compound selected within the group of the strong acids: hydrochloric, nitric and phosphoric; within the group of these strong acids neutralized by their neutral salts; within the group of the following organic acids: oxalic, maleic, o-phthalic, l-malic, succinic, nicotinic, salicylic and trifluoracetic. The boiling temperatures range between 160 and 210`C, preferably between 180 and 200`C. After three minutes at the minimum, we obtain the separation of the lignin and the hydrolysis of the hemicelluloses dissolved; after that, the fibres are easily dispersible while forming a pulp. By proceeding to a mechanical refining at a high pressure, a high density thermomechanical pulp is obtained after a shorter boiling time. With the neutralized acids, as well as with the organic acids, particularly with the oxalic acid, we can obtain a fibre with a high degree of polymerization. The lignin is obtained as a precipitate which separates from the liquid; the liquid solvent, usually ethanol or acetone, is evaporated; then the drained lignin is redissolved in the minimal quantity of acetone; a new precipitation with an excess of water allows to obtain the lignin in the form of a slightly coloured powder. A prolonged boiling dehydrates and disaggregates the sugars; by the strong acids action, takes place the formation of light molecular weight or microcristalline cellulose, glucose or organic acids, methanol and furfuralic compounds.