Use of flocculating agents for separating the solid residue...

C - Chemistry – Metallurgy – 12 – P

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C12P 7/10 (2006.01) C13K 1/04 (2006.01)

Patent

CA 2494651

Process for improving the separation efficiency of residual solid matter from the liquid phase of an aqueous acid hydrolysate of a naturally occurring polysaccharide comprising dissolved sugars, and residual acid wherein a flocculating agent (s) is added to the aqueous mixture in an effective amount, and a process of producing fermentation products comprising the steps of, (i) hydrolysing a particulate polysaccharide based plant derived material in an acid medium, and thereby forming an aqueous mixture comprising dissolved sugar and solid matter, (ii) subjecting the aqueous mixture to one or more separation stages in which solid matter are removed from the aqueous phase, (iii) adjusting the pH of the obtained aqueous phase to a pH of at least 4, (iv) fermenting the dissolved sugars of the aqueous phase by a microorganism to produce a fermentation product, (v) isolating the fermentation product, wherein in at least one separation stage in step (ii) a flocculating agent is added to the aqueous mixture in an effective amount.

La présente invention concerne un processus permettant d'améliorer l'efficacité de la séparation de matière solide résiduelle d'une phase liquide d'un hydrolysat acide aqueux d'un polysaccharide survenant naturellement comprenant des sucres dissous, un acide résiduel dans lequel un ou des floculants sont ajoutés au mélange aqueux dans une quantité efficace et un processus de production de produits de fermentation qui consiste à (i) hydrolyser une matière dérivée de plante à base de polysaccharide particulaire dans un milieu acide, et à former un mélange aqueux comprenant un sucre dissout et une matière solide, (ii) à soumettre ce mélange aqueux à une ou plusieurs étapes de séparation dans lesquelles les matières solides sont retirées de la phase aqueuse, (iii) à régler le pH de la phase aqueuse obtenue à un pH d'au moins 4, (iv) à faire fermenter les sucres dissous de la phase aqueuse au moyen d'un micro-organisme de façon à produire un produit de fermentation, (v) à isoler ce produit de fermentation, dans au moins une étape de séparation de la phase (ii) un floculant étant ajouté au mélange aqueux dans une quantité efficace.

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