Abstract
ABSTRACTIn this study, coconut fibers were pretreated using NaOH solution and liquefied in hot-compressed water. A Box–Behnken design (BBD) was applied to identify the optimum liquefaction condition. The individual and interactive effects of four factors on liquefaction reaction were evaluated by the response surface methodology (RSM). After the pretreatment, the natural fiber crystallinity index (CrI) was increased, as proved by the X-ray diffraction (XRD) diffractograms. The resulting liquid and residues were characterized by Fourier transform infrared (FTIR), and it was found that the liquefied liquid mainly contained aromatic phenolic compounds and its derivatives.
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