Xyrofin Oy

Danisco Sweeteners Oy

Cultor Oy

Dupont Nutrition Biosciences Aps

Danisko Sweeteners Oy

Danisco A/s

Mirja Lindroos

Heikki O Heikkila

Juha Veikko Nurmi

Heikki Heikkil&auml;

Hannu A Paananen

Olli-Pekka Eroma

Matti Tylli

Outi Puuppo

Heikki Heikkilä

Vili Ravanko

Hannu Koivikko

Marja-Leena Sarkki

Tapio Viljava

Jarmo Kuisma

Jari Lewandowski

Johanna Nygren

Mika Mänttäri

Pia Saari

Raimo Alen

Pertti Walliander

Marianne Nyström

Hannele Nikander

Jorma Sundquist

Mika M&auml;ntt&auml;ri

Marianne Nystr&ouml;m

Seppo Kauliom&auml;ki

P&auml;ivi Sarmala

Siru Kauko

Paivi Ojala

Raimo Rasimus

Minna Kaarto

Heikki HeikkilÄ

The present invention relates to a process for the production of xylose and dissolving pulp from xylan-containing biomass, such as hardwood. The invention is based on prehydrolysis of the xylan-containing biomass with SOin specified conditions, followed by chromatographic fractionation, nanofiltration or precipitation crystallization of the xylose-containing prehydrolyzate to obtain a xylose product having a xylose content of at least 55% on DS. The dissolving pulp obtained from the process can be used for example for the production of viscose.

Process of producing xylose and dissolving pulp

The invention relates to removing crystallization inhibitors from a solution comprising one or more reducing sugars by nanofiltration, hydrolysis and/or chromatography. The reducing sugars are typically selected from fructose and xylose.

Crystallization of sugars

The invention relates to a process of separating compounds with a small molar mass from compounds having a molar mass less than 1.9 times that of the compounds with a small molar mass using nanofiltration. The compounds with a small molar mass have a typical molar mass less than 250 g/mol. In one embodiment of the invention, pentose sugars are separated from hexose sugars. The invention can be applied to the recovery of xylose from spent liquors and to the recovery of betaine from sugar beet pulp extracts, for example.

Separation process

The invention relates to a process of producing a xylose solution from a biomass hydrolysate by subjecting the biomass hydrolysate to nanofiltration and recovering as the nanofiltration permeate a solution enriched in xylose. The biomass hydrolysate used as starting material is typically a spent liquor obtained from a pulping process.

Recovery of xylose

The invention relates to a method of preparing chemical pulp and xylose by the use of alkaline or neutral cooking and post hydrolysis of the pulp by performing the post hydrolysis directly on the pulp by means of acid treatment. In the method of the invention, the xylan in the pulp is utilized as completely as possible, resulting in a good xylose yield and, simultaneously, acceptable characteristics for the pulp.

Preparation of chemical pulp and xylose, utilizing a direct acid hydrolysis on the pulp

The invention relates to a process for purifying a maltose-containing liquor from a undesired impurities, such as maltotriose. The process of the invention is characterized by nanofiltering said liquor and recovering a purified maltose solution as the permeate.

Process for purifying maltose

The invention relates to a process for the production of xylose from a paper-grade hardwood pulp comprising the steps of extracting xylan contained in said pulp into a liquid phase, subjecting the xylan contained in the obtained liquid phase to conditions sufficient to hydrolyze xylan to xylose, and recovering the xylose, wherein the extracting step includes at least one treatment of an aqueous suspension of said pulp or an alkali-soluble material thereof with a xylanase enzyme.

Process for the production of xylose from a paper-grade hardwood pulp

The invention relates to a method of producing xylitol and erythritol from arabinoxylan-containing material. According to the invention, the arabinoxylan-containing material is hydrolyzed and xylose and arabinose are separated from the obtained hydrolysate, whereafter the xylose is reduced to xylitol, and the xylitol is recovered, and the arabinose is subjected to alkaline oxidation to obtain erythronic acid which is reduced to erythritol, and the erythritol is recovered.

Method of producing polyols from arabinoxylan-containing material

The present invention relates to a method of producing xylose by chromatographic separation of the xylose from a sulphite cooking liquor containing for example xylose and xylonic acid. The xylose yield of the separation is affected by the xylonic acid and xylose content in the cooking liquor used in the separation and the amount of base cation used in the sulphite cooking.

Method of producing xylose

The present invention relates to a process for the simultaneous production of converted and non-converted sugar and/or non-sugar products. The process is especially adapted to the simultaneous production of isomaltulose and/or trehalulose, and betaine or invert sugar from plant derived juices. Sucrose in said juices are enzymatically converted into isomaltulose and trehalulose and the target products are separately recovered from the resulting solution. The isomaltulose may be further converted into isomalt.

Process for the production of isomatulose and other products

Method for recovery of xylose from solutions

Process for fractioning vinasse

The invention relates to a method for producing xylitol from a material containing xylose and xylonic acid. According to the method, xylose and xylonic acid are separated from the material containing xylose and xylonic acid, whereafter the separated xylose and xylonic acid are reduced to xylitol, and the xylitol is recovered.

Method for producing xylitol

Process for clarifying vinasse

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Kirkkonummi, Finland

Mirja Lindroos