| 摘要 |
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 H2S, CO2 and alkali metal carbonate in situ; (2) HS- ions are formed by disassociation of H2S and/or by disassociation of alkali metal hydrogen sulfide; and (3) at least a portion of the H2S and/or HS- 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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