Effect of Alkaline Pre-treatment on the Production Characteristics  of Nanofibrillated Cellulose from White Ledger

Im Jeong Hwang; Jin Mo Kim; Yong Kyu Lee; Myoung Won

doi:10.7584/JKTAPPI.2017.10.49.5.86

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2017 Vol.49, Issue 5 Preview Page

Effect of Alkaline Pre-treatment on the Production Characteristics of Nanofibrillated Cellulose from White Ledger 알칼리 전처리가 white ledger를 이용한 NFC 제조 특성에 미치는 영향

30 October 2017. pp. 86-96

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Abstract

To evaluate the feasibility of NFC production using white ledger as a raw material, deinking and ash removal were carried out and fibrillation was performed with a grinder. In order to compare the fibrillation characteristics of white ledger, the fibrillation of HwBKP and SwBKP was performed in the same manner. Especially, white ledger is expected to be difficult to fibrillate by hornification phenomenon, so it is pretreated with 0.5, 1, 3 and 5% alkali solutions and then fibrillated. White ledger was found to be harder to fibrillate than HwBKP and SwBKP, and when pretreated with a low concentration alkali solution of up to 5%, fibrillation was remarkably improved. FTIR analysis showed no change in absorption band due to fibrillation and alkali pretreatment, and no apparent change in crystallinity and hydrogen bond index was observed. The CED polymerization degree of NFCs decreased with the progress of fibrillation, but the effect of alkali pretreatment was not clear. The average fiber length of NFC was decreased by fibrillation. In the case of HwBKP and SwBKP, the alkaline pretreatment effect on the average fiber length change was not clear. However, in the case of white ledger, the average fiber length was significantly decreased in the early stage of fibrillation and the difference from the untreated case was decreased as the fibrillation progressed. The relative specific energy consumptions in producing NFC at The relative specific energy consumptions in producing NFC at the same fibrillation level were 17.8 Wh/g for HwBKP, 25.1 Wh/g for SwBKP, and 37.4 Wh/g for white ledger, respectively. The specific energy consumption of the white ledger was reduced to 18.1 Wh/g when it is pretreated with 3-5% alkali solution.

Keywords

White ledger

alkali pre-treatment

nanofibrillated cellulose

FTIR

degree of polymerization

FESEM

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Information

Publisher :Korea Technical Association of The Pulp and Paper Industry
Publisher(Ko) :한국펄프종이공학회
Journal Title :Journal of Korea TAPPI
Journal Title(Ko) :펄프종이기술
Volume : 49
No :5
Pages :86-96
Received Date : 2017-10-11
Revised Date : 2017-10-23
Accepted Date : 2017-10-24
DOI :https://doi.org/10.7584/JKTAPPI.2017.10.49.5.86

Journal of Korea TAPPI ISSN:0253-3200(Print) 펄프종이기술

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Literature Cited