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Effect of Alkali Pretreatment on Preparation of Microcrystalline Cellulose
Received:October 02, 2019  
DOI：10.11980/j.issn.0254-508X.2020.01.004
Key Words:alkali pretreatment  microcrystalline cellulose  acid permeation rate  particle size distribution
Fund Project:陕西省重点研发计划项目 2017ZDXM-SF-090 ; 国家重点研发计划项目 2017YFB0307901 ; 陕西省教育厅重点实验室项目 17JS015 陕西省重点研发计划项目（2017ZDXM-SF-090）；国家重点研发计划项目（2017YFB0307901）；陕西省教育厅重点实验室项目（17JS015）。
Author NameAffiliation
LI Jinbao College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science &
Technology，Xi'an，Shaanxi Province，710021 
MA Feiyan College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science &
Technology，Xi'an，Shaanxi Province，710021 
XIU Huijuan College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science &
Technology，Xi'an，Shaanxi Province，710021 
CHENG Rui College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science &
Technology，Xi'an，Shaanxi Province，710021 
FENG Pan College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science &
Technology，Xi'an，Shaanxi Province，710021 
YANG Xue College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science &
Technology，Xi'an，Shaanxi Province，710021 
ZHAO Xin College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper，Shaanxi University of Science &
Technology，Xi'an，Shaanxi Province，710021 
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Abstract:In order to accelerate the acid permeation efficiency in preparation of microcrystalline cellulose (MCC) by acid hydrolysis process，and improve the uniformity of the reaction of the acid hydrolysis reaction in the cell wall of cellulose fiber，thereby improving the quality of the MCC，NaOH solution was used to pretreat softwood dissolving pulp for limited swelling. The effect of alkali pretreatment on the preparation of MCC by acid hydrolysis was investigated through characterization of the properties of microcrystalline cellulose by laser particle size analyzer，X-ray diffractometer (XRD)，Scanning electron microscope (SEM)，Fourier transform infrared (FT-IR) and Thermo gravimetry(TGA). The results showed that the average particle size of MCC decreased from 52.1 μm to 41.8 μm after pretreatment with the optimum alkali concentration（9%），the particle size distribution was more concentrated， and the MCC crystallinity basically unchanged. It showed that alkali treatment had no major influence on the chemical structure and thermal stability of cellulose fibers and MCC.
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