The pre-hydrolysis liquor (PHL) of the kraft-based dissolving pulp production process is currently sent to the recovery
boiler and incinerated. However, PHL contains about 5–8% lignocelluloses that can be utilized in the production of
value-added chemicals. In this study, a process for producing xylitol from hemicelluloses in PHL is developed. This
process involves several acidification, neutralization, adsorption (along with reactivation) and evaporation stages.
The mass balance indicates that 533 kg/h xylitol (with 99% purity), 187 kg/h lignin, 806 kg/h basic ferric acetate, and
1600 kg/h gypsum can be produced from 41,670 kg/h PHL. The energy balance shows that the evaporators are the
largest consumers of energy, while the reactivation kiln, acidification, neutralization, and precipitation processes
generate some heat. Overall, 41% conversion of xylose to xylitol is achieved
The pre-hydrolysis liquor (PHL) of the kraft-based dissolving pulp production process is currently sent to the recoveryboiler and incinerated. However, PHL contains about 5–8% lignocelluloses that can be utilized in the production ofvalue-added chemicals. In this study, a process for producing xylitol from hemicelluloses in PHL is developed. Thisprocess involves several acidification, neutralization, adsorption (along with reactivation) and evaporation stages.The mass balance indicates that 533 kg/h xylitol (with 99% purity), 187 kg/h lignin, 806 kg/h basic ferric acetate, and1600 kg/h gypsum can be produced from 41,670 kg/h PHL. The energy balance shows that the evaporators are thelargest consumers of energy, while the reactivation kiln, acidification, neutralization, and precipitation processesgenerate some heat. Overall, 41% conversion of xylose to xylitol is achieved
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