Process for making sulfur enhanced undigested cellulosic fiber material and pulp
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United States of America Patent
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Nov 2, 1999
Issued Date -
N/A
app pub date -
Oct 29, 1997
filing date -
Apr 30, 1996
priority date (Note) -
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Abstract
Provided is a process for making pulp having the steps of: contacting an undigested cellulosic fiber material with a pretreatment liquid formulated from a mixture comprising alkali metal bicarbonate and alkali metal hydrogen sulfide as reaction components which are dissolved or disbursed in an aqueous liquid, under conditions that: (1) the reaction components react to form H.sub.2 S, CO.sup.2 and alkali metal carbonate in situ; (2) HS.sup.- ions are formed by disassociation of H.sub.2 S and/or by disassociation of alkali metal hydrogen sulfide; and (3) at least a portion of the H.sub.2 S and/or HS.sup.- ions is absorbed or diffused into the undigested cellulosicfiber material to enhance the sulfur content of the undigested cellulosic fiber material, to form a sulfur enhanced, undigested cellulosic fiber material, wherein the pretreatment liquid is substantially free of alkali metal hydroxide; and digesting the sulfur enhanced, undigested cellulosic fiber material in a digester to form a pulp.
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