Effect of pre-hydrolysis on the soda-anthraquinone pulping of corn stalks and Saccharum spontaneum (kash)
2012
Jahan, M Sarwar | Rahman, M Mostafizur
The limited reserves of fossil fuel and trend of global warming increase interest in renewable resources. In this circumstance, significance has been developed on the production of fuels and chemicals from biomass that will replace fossil fuel. Corn stalks and Saccharum spontaneum (kash) are agricultural wastes, which are good raw materials for pulp production. However, there are limitations in achieving the desired pulp quality due to the presence of pith. The pith constitutes 20–35% of the dry matter of the raw materials. It must be removed prior to pulping to obtain good quality pulp. Chemically pith is similar to lignocellulosic, but it does not have fibrous structure. So the pith can be used in producing fuels and chemicals. Pre-hydrolysis prior to soda-AQ pulping of corn stalks and kash was carried out in order to remove pith as well as to extract hemicelluloses for use as fuel and chemicals. The pre-hydrolysis was performed at 150°C for 1h. Pre-hydrolysis extracted 50–60kg sugars, 28–34kg lignin and 8–22kg acetic acid per tonne of corn stalks/kash with the sacrifice of pulp yield. Pre-hydrolysed pulp had less fines resulting in lower drainage resistance (⁰SR) as compared to non-prehydrolysed counterpart. Pulp produced from the pre-hydrolysed corn stalks and kash had higher tear index but lower tensile index than the non-prehydrolysed counterpart. The pre-hydrolysis process requires careful optimization of the pulping process, and allows lower chemical charges. After D₀EₚD₁ bleaching, the differences of pulp yield and physical properties were reduced. The pre-hydrolysed pulp showed almost similar bleachability to non pre-hydrolysed pulp.
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