Applications of Lignocellulose Biotechnology in the Pulp and Papermaking Industry - Biotechnology of Lignocellulose - page 321

Table 8.7 By-products that may be obtained from sulfite softwood pulp red liquid

[ 21 ]
Compound (t) 1 ]

Origin Yield [kg

Methyl alcohol OCH 3 of glucosyl xylan 7-10

Acetic acid Xylan acetyl 30-90

Methane acid Oxidation of formaldehyde acidic sulfite 0.5-1

Formaldehyde HOCH 3 of lignin 2-6

Methyl ethyl ketone
aldehydes

Hexose decomposition 5-6

Furfural Pentose dehydration 5-6

Glucuronic sulfonic
acid, uronic acid

Replacement and oxidation in the sulfites
of saccharides

150-250

Saccharides Degradation of hemicellulose and

cellulose

200-400

Cymene Oxidation of the terpene acidic sulfite 0.3-1

Lignin sulfonate Lignin 600-800

but also monosaccharides generated by the hydrolysis of partial cellulose and
hemicellulose. About 60-65 % of the monosaccharides are reducing substances
(this usually refers to hexose) that can be used for ethanol production, and the other
35-40 % are reducing substances (this usually refers to pentose) that cannot be
fermented to produce ethanol. Therefore, this red liquid is used to produce ethanol,
and the pentose is used to cultivate yeast.

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