C - Chemistry – Metallurgy – 07 – H
Patent
C - Chemistry, Metallurgy
07
H
C07H 3/06 (2006.01) C07H 1/00 (2006.01)
Patent
CA 2699545
The present invention relates to a method to dispose plant cellulose materials, in particular to a method for preparing a main hydrolysate by hydrolyzing the plant cellulose materials with concentrated sulfuric acid. The plant cellulose materials are mixed with sulfuric acid in batches, and the main hydrolysate is obtained after hydrolysis. The batch mixing includes the following procedures: (1)sulfuric acid solution is used to dissolve part of the plant cellulose materials thereby forming a hydrolysate; (2)when the plant cellulose materials can not be dissolved any more, concentrated sulfuric acid with the concentration more than 80 wt% is successively added into the hydrolysate, and another part of the plant cellulose materials are added; (3)and then the procedure as step (2) is repeated until all the plant cellulose materials are completely hydrolyzed. The method utilizing concentrated sulfuric acid to prepare the main hydrolysate can hydrolyze the maximum cellulose with the least sulfuric acid, thereby decreasing the acid recovery cost proportioned by per kilogram sugar obtained by hydrolysis.
Procédé de traitement de fibres végétales, en particulier d'hydrolysation de ces fibres avec de l'acide sulfurique concentré pour élaborer un hydrolysat principal. On mélange les fibres avec de l'acide sulfurique en lots, et le produit est obtenu par hydrolyse. Le mélange par lots comprend les opérations suivantes: utilisation d'une partie de l'acide pour dissoudre les fibres, et lorsque les fibres ne peuvent plus être dissoutes plus avant, adjonction successive d'acide concentré à plus de 80 %, en poids, dans l'hydrolysat, adjonction par échelons des fibres; on répète ensuite ces procédures jusqu'à achever l'hydrolyse. Le procédé décrit, qui fait appel à de l'acide concentré pour l'élaboration du produit, permet une hydrolysation maximum avec un minimum d'acide, ce qui réduit le coût de récupération en proportion du sucre issu de l'hydrolysat.
Chen Peihao
Smiths Ip
LandOfFree
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