Magnesium ions in a process for alkaline peroxide treatment of nonwoody lignocellulosic substrates
First Claim
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1. An improved process for converting nonwoody lignocellulosic substrates into products digestible by ruminants and ingestible by humans comprising the following steps:
- (a) forming a slurry of the substrate with aqueous alkali in an amount at least sufficient to wet the substrate, the slurry having a pH in the range 10 to 13 and a temperature of about 25°
to 100°
C., the slurry being substantially free of peroxide;
(b) maintaining the slurry for a sufficient time under conditions of (a) for the alkali to wet the substrate;
(c) adding sufficient magnesium compound to provide about 00.5 to 1.0 percent magnesium ions based on the dry weight of the substrate;
(d) adding a water-soluble peroxide in an amount sufficient to bleach the substrate to the alkaline slurry after or with the addition of the magnesium ions;
(e)maintaining the substrate in contact with the alkaline peroxide solution at a sufficient temperature, pH and for a time sufficient to produce a substantially bleached, cellulosic fiber; and
(f) separating the bleached fiber from the alkaline liquid.
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Abstract
An improved process for delignifying and bleaching nonwoody, lignocellulosic material into products digestible by ruminants and ingestible by humans. The process comprises treating the substrate in an alkaline solution for a period of time and adding magnesium ions prior to adding peroxide or, alternatively, adding the magnesium to the peroxide prior to adding the peroxide to the alkaline slurry.
36 Citations
29 Claims
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1. An improved process for converting nonwoody lignocellulosic substrates into products digestible by ruminants and ingestible by humans comprising the following steps:
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(a) forming a slurry of the substrate with aqueous alkali in an amount at least sufficient to wet the substrate, the slurry having a pH in the range 10 to 13 and a temperature of about 25°
to 100°
C., the slurry being substantially free of peroxide;(b) maintaining the slurry for a sufficient time under conditions of (a) for the alkali to wet the substrate; (c) adding sufficient magnesium compound to provide about 00.5 to 1.0 percent magnesium ions based on the dry weight of the substrate; (d) adding a water-soluble peroxide in an amount sufficient to bleach the substrate to the alkaline slurry after or with the addition of the magnesium ions; (e)maintaining the substrate in contact with the alkaline peroxide solution at a sufficient temperature, pH and for a time sufficient to produce a substantially bleached, cellulosic fiber; and (f) separating the bleached fiber from the alkaline liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification