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US 4,075,406 AGranted
Process for making xylose
AssigneeSuomen Sokeri Osakeyhtio
InventorsAsko J. Melaja, Lauri Hamalainen
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Abstract
A method for recovering xylose from pentosan-, preferably xylan-containing raw materials including the steps of hydrolyzing the raw material, purifying the hydrolysate by ion exclusion and color removal, and then subjecting the purified solution to chromatographic fractionation to provide a solution containing a high level of xylose.
Claims5
A method for the production of xylose from a pentose-rich solution obtained by acid hydrolysis of a pentosan-containing raw material which comprises the steps of:
- a. removing suspended solids from the solution by mechanical filtration;
- b. removing inorganic salts and the major portion of organic impurities and color by ion exclusion;
- c. removing the balance of color and other organic impurities by treating the solution with a material selected from the group consisting of an ion exchange resin and activated carbon;
- and
- d. fractionating the solution thus obtained by ion exchange chromatographic techniques to provide a xylose solution of high purity.
2 more elements
A method for the production of xylose from xylan-containing raw material which comprises the steps of:
- a. hydrolyzing the raw material with acid to produce a pentose-rich solution,
- b. neutralizing the solution with alkali,
- c. filtering the solution to remove solids suspended therein,
- d. passing the solution through a bed selected from the group consisting of an ion exclusion column and a column of activated carbon to remove inorganic salts and the major portion of organic impurities,
- e. then passing the solution through an ion exchange resin column to remove the balance of color and other oganic impurities, and
- f. fractionating the solution thus obtained by passing it through a chromatographic column of ion exchange resin to obtain a xylose solution of high purity and a pentose molasses.
3 more elements
Dependencies are inferred from the claim text.