Abstract
The chemical sorption characteristics of typical kraft mill green liquor (GL) chemicals into loblolly pine softwood chips were analyzed as part of a larger study investigating new, low-capital kraft pulping modifications. Specifically, the sorption profiles of hydroxide (alkali), hydrosulfide, and carbonate ions from industrially supplied GL into wood chips were compared and contrasted. The influence of pretreatment conditions, such as GL charge, pretreatment temperature, and time, were the main variables controlled to assess their influence on chemical sorption profiles. The results indicated that significant differences existed for the sorption characteristics of each chemical component. Alkali and sulfide showed more affinity for wood components than carbonate during the pretreatment. Thus, the order of decreasing sorption rates was as follows: alkali and sulfide, followed by carbonate. In general, it was found that pretreatment of wood chips with GL under a moderate GL charge and higher temperatures provides the maximum sulfide concentration in wood chips, although extended times are not necessary.
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