PROCESS FOR TWO-STAGE DIGESTION OF NATURAL PRODUCTS CONTAINING XYLAN IN ORDER TO OBTAIN XYLOSE

摘要

1500478 Extracting xylose from nut-shells SUD-CHEMIE AG 4 Oct 1976 [8 Oct 1975] 41052/76 Heading C2S A process for the two-stage digestion of xylancontaining natural products to obtain xylose comprises (i) digesting stone nut shells with 1À5-6 molar alkali metal hydroxide solution to split off and neutralize the acetic acid bound in the stone nut shells with a 1À5-6 molar alkali hydroxide solution to separate off and neutralize the acetic acid linked in the shells at 10-50‹ C. and (ii) diluting the digestion solution to a molar concentration of less than 0À75 and completing the alkaline treatment at a temperature of above 60‹ C. The shells may be coconut, almond, palm nut, olive, date stones or babacu nuts. The shells are preferably pulverized and treated with 1À75-2À5 molar alkali at up to 200‹ C. for ¢-3 hours followed by treatment with diluted alkali at the b.p. of the solution.