Method of manufacturing xylose solution from xylan-containing raw material
AssigneeSulzer Brothers Limited
InventorHansjorg Pfeiffer
Life of this patent
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Abstract
Xylan-containing raw material which is very absorbent in the dry state, particularly one year old plants, is treated with an acid either by spraying or by an acid vapor to a limited extent. The extent of treatment is sufficient to permit hydrolysis of the xylan to xylose without complete saturation of the raw material. After hydrolysis, the raw material is washed in counterflow with water to extract the xylose solution. Washing may be accomplished in an extraction column or in a multi-step mixing arrangement.
Claims9
A method of manufacturing a xylose solution from a xylan containing plant raw material in particular animal plants which is very water absorbent in the dry state, said method comprising the steps of
- spraying the raw material with an acid to an extent sufficient to permit hydrolysis of the xylan to xylose without completely saturating the raw material;
- heating the raw material to a temperature sufficient to effect hydrolysis of the xylan to a xylose solution;
- and
- thereafter washing the acid-treated and heated raw material in counterflow with water to extract the xylose solution therefrom.
A method of manufacturing a xylose solution from a xylan-containing plant raw material in particular annual plants which is very water absorbent in the dry state, the method comprising the steps of
- spraying the raw material with an acid solution to such an extent that the ratio of water originally present in the raw material together with the acid solution and the condensed water vapor of the step following hereinafter to the over-dry raw material is such that the raw material is not saturated completely with liquid after the step following hereinafter;
- heating the sprayed raw material with saturated water vapor to a temperature sufficient to effect the hydrolysis of the xylan to the xylose solution;
- and
- washing the acid impregnated, heated and hydrolysed raw material in counterflow with water to extract the xylose solution therefrom.
A method of manufacturing a xylose solution from xylan-containing plant raw material in particular annual plants which is very waterabsorbent in dry state, said method comprising the steps of
- spraying the raw material with acid to such an extent that the ratio of liquid to absolutely dry material in the raw material after spraying and heating does not exceed 70% of that ratio which would be obtained by immersing said raw material for 10 minutes in said acid solution;
- heating the raw material at reaction temperature by live steam;
- keeping the heated raw material at reaction temperature for a time sufficient to produce in combined effect with the acid solution and the temperature a hydrolysis of minimum 60% of the xylan of the raw material to xylose solution;
- and
- thereafter washing the acid-treated heated and hydrolysed raw material in counterflow with water to extract the xylose solution therefrom.
Dependencies are inferred from the claim text.