Production of a fermentation product

C - Chemistry – Metallurgy – 12 – P

Patent

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Details

C12P 7/40 (2006.01) C02F 1/52 (2006.01) C02F 1/56 (2006.01) C12P 7/06 (2006.01) C12P 7/16 (2006.01) C12P 7/18 (2006.01) C12P 7/20 (2006.01) C12P 7/24 (2006.01) C12P 7/28 (2006.01) C12P 13/04 (2006.01) C02F 11/12 (2006.01) C02F 11/14 (2006.01)

Patent

CA 2494656

A process of separating suspended solids from a fermentation liquor by subjecting the liquor to a solids-liquid separation stage, wherein the fermentation liquor is produced in a fermentation process for the production of a fermentation product, which liquor comprises water, lignin and BOD, wherein the solids liquid separation stage is assisted by a treatment system, characterised in that the treatment system comprises either, (i) a cationic polymer having an intrinsic viscosity (IV) of at least 4 dl/g at a dose of above 2 kg/tonne based on dry weight of suspension, or (ii) a cationic polymer having an intrinsic viscosity (IV) of at least 4 dl/g and, (iii) an anionic polymer, and/or (iv) a cationic polymer of intrinsic viscosity of below 4 dl/g and a cationic charge density of at least 3 meq/g and/or (v) inorganic coagulants and/or (vi) charged microparticulate material.

L'invention concerne un procédé permettant de séparer des solides en suspension d'une liqueur de fermentation. Ce procédé consiste à soumettre la liqueur à une étape de séparation solides/liquides. La liqueur de fermentation est produite dans un processus de fermentation pour la production d'un produit de fermentation. La liqueur comprend de l'eau, de la lignine et du BOD. L'étape de séparation solides/liquides est facilitée par un système de traitement caractérisé en ce que ce système comprend soit: (i) un polymère cationique présentant une viscosité intrinsèque (IV) d'au moins 4 dl/g à une dose supérieure à 2 kg/tonne, en fonction du poids à sec de suspension, ou (ii) un polymère cationique présentant une viscosité intrinsèque (IV) de 4 dl/g et, (iii) un polymère anionique, et/ou (iv) un polymère cationique de viscosité intrinsèque inférieure à 4 dl/g et une densité de charge cationique d'au moins 3 meq/g et/ou (v) des coagulants inorganiques et/ou (vi) une matière microparticulaire chargée.

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