LIGNIN AND SODIUM LIGNOSULFONATE PRODUCTION FROM THE BLACK LIQUOR GENERATED DURING THE PRODUCTION OF BIOETHANOL FROM RICE STRAW

Authors

  • Nghi Huu Do
  • Tan Minh Le
  • Yen Phi Hoang Duong
  • Nga Hoang Nguyen Do
  • Huong Xuan Ly Doan
  • Viet Tan Tran
  • Phung Kim Thi Le Faculty of Chemical Engineering, Ho Chi Minh City University of Technology, VNU-HCM 268 Ly Thuong Kiet Str., Ward 14, Dist. 10, Ho Chi Minh City, Vietnam

DOI:

https://doi.org/10.15625/2525-2518/58/6A/15465

Keywords:

lignosulfonate, lignin, rice straw, sulfomethylation

Abstract

Abstract-HCTN7. Rice straw is considered as an abundant resource to recover hemicellulose, cellulose, and lignin. Lignin, considered as waste from the biomass pretreatment process for bioethanol production, has numerous applications in value-added chemical products such as lignosulfonate, vanillin, guaiacol, quinones, cresol, … Lignosulfonate was used in various industrial processes such as concrete admixtures, oil well dispersants, dyestuff, coal water slurry dispersants, agricultural chemicals, and other industrial binders. However, lignosulfonate production from rice straw is less attractive due to the difficulty of lignin recovery. Therefore, the objective of this study is to recover lignin and optimize the sulfomethylation of lignin originated from rice straw by sodium sulfite for the highest reaction efficiency to produce lignosulfonate. The effects of reactive conditions including reaction time, temperature, and sodium sulfite/lignin ratio on the sulfomethylation are investigated by experiments and analyzed by response surface methodology (RSM). The results demonstrate that quadratic second-order modeling is compatible with experimental data (R-squared value of 99.9%) and all three factors have a great impact on reaction efficiency (p < 0.05). The optimal reaction condition predicted from the empirical modeling is the reaction time of 150 minutes, the temperature of 80oC, and the sodium sulfite/lignin ratio of 1:2 g/g. The verified experiment at the optimal condition produces sodium lignosulfonate with a high reaction efficiency of 96.2% and low surface tension of 48 N/m. 

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Author Biographies

Nghi Huu Do

 

Tan Minh Le

 

Yen Phi Hoang Duong

 

Nga Hoang Nguyen Do

 

Huong Xuan Ly Doan

 

Viet Tan Tran

 

Phung Kim Thi Le, Faculty of Chemical Engineering, Ho Chi Minh City University of Technology, VNU-HCM 268 Ly Thuong Kiet Str., Ward 14, Dist. 10, Ho Chi Minh City, Vietnam

Faculty of Chemical Engineering, Ho Chi Minh City University of Technology, VNU-HCM 

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Published

2021-03-31

Issue

Section

The 7th National Workshop on Research and Development of Natural Products