알칼리 수용액에서 PEG 및 Urea 함량에 따른 유기용매 펄프의 용해 특성 평가 (Dissolution of Lignin-Rich Organosolv Pulps by PEG and Urea Contents in Aqueous Alkaline Solution)

서지정보

· 발행기관 : 한국펄프·종이공학회
· 수록지 정보 : 펄프종이기술 / 52권 / 4호 / 63 ~ 72페이지
· 저자명 : 류지애, 조연수, 이중명

초록

In this study, we investigated the use of the contents of polyethylene glycol (PEG) and urea in sodium hydroxide (NaOH) aqueous solutions to dissolve lignin-rich organosolv pulps by evaluating dissolution yields and quality of dissolved organosolv pulp solutions towards further valorization. Unbleached pine organosolv pulp (UBOP) containing 26.8% residual lignin was prepared and then subsequently delignified with sodium chlorite to produce a delignified organosolv pulp (DOP) with 14.2% residual lignin content. It was found that lignin content of the organosolv pulps significantly impacted dissolution yield.
Further, as PEG content increased in NaOH aqueous solutions, the dissolution yields of UBOP and DOP gradually decreased by an average of 18% and 20%, respectively. In contrast, the effect of urea on dissolution yield was dependent on lignin content of the feed and NaOH content in solution. The dissolution yield of UBOP increased by an average of 6% as urea, but in DOP, the dissolution yield did not change with increasing amounts of urea. In addition, residual lignin content of regenerated cellulose film fabricated from DOP dope in PEG/NaOH was higher than that found in urea/NaOH, indicating that a PEG/NaOH aqueous solution may be an effective dissolution solvent for cellulose, hemicellulose, and lignin.

영어초록

In this study, we investigated the use of the contents of polyethylene glycol (PEG) and urea in sodium hydroxide (NaOH) aqueous solutions to dissolve lignin-rich organosolv pulps by evaluating dissolution yields and quality of dissolved organosolv pulp solutions towards further valorization. Unbleached pine organosolv pulp (UBOP) containing 26.8% residual lignin was prepared and then subsequently delignified with sodium chlorite to produce a delignified organosolv pulp (DOP) with 14.2% residual lignin content. It was found that lignin content of the organosolv pulps significantly impacted dissolution yield.
Further, as PEG content increased in NaOH aqueous solutions, the dissolution yields of UBOP and DOP gradually decreased by an average of 18% and 20%, respectively. In contrast, the effect of urea on dissolution yield was dependent on lignin content of the feed and NaOH content in solution. The dissolution yield of UBOP increased by an average of 6% as urea, but in DOP, the dissolution yield did not change with increasing amounts of urea. In addition, residual lignin content of regenerated cellulose film fabricated from DOP dope in PEG/NaOH was higher than that found in urea/NaOH, indicating that a PEG/NaOH aqueous solution may be an effective dissolution solvent for cellulose, hemicellulose, and lignin.

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