High-speed shear assisted alkaline extraction of cellulose from sugarcane bagasse and its physicochemical analysis
In order to solve the problem of low efficiency of traditional alkali extraction method of cellulose,the high-speed shear assisted alkaline extraction of cellulose was optimized by response surface methodology using sugarcane bagasse as raw material,and the physicochemical properties of bagasse cellulose(S-CPC)extracted by high shear assisted extraction method and chemically pure cellulose(CPC)extracted by traditional alkali extraction method were compared.The results show that under the conditions of rotational speed of 5600 rpm,extraction time of 16 min,and NaOH concentration of 4.5%,the content of α-cellulose of S-CPC obtained is(93.05±0.21)%,slightly higher than that of CPC(91.23±0.01)%and the yield is(26.14±0.42)%.The extraction time is shortened by 56%compared.The SEM analysis shows that the surfaces of S-CPC and CPC are covered with fiber bundles,and the former is more loosely packed.The FT-IR spectroscopy and X-ray analysis reveal that the cellulose structure of S-CPC and CPC is type I;the crystallinity is relatively high,which is 82.6%and 83.0%,respectively.This study can provide a reference for the efficient preparation of high-content sugarcane cellulose.
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