he water consumption of sugarcane bagasse post-washing after protic ionic liquid pretreatment and its impact on 2G ethanol productio

Author(s)

Nakasu, P. Y. S. ^[1] ; Ienczak, J. L. ^[2] ; Rabelo, S. C. ^[3] ; Costa, A. C. ^[1]

Affiliation

^[1] State Univ Campinas UNICAMP, Sch Chem Engn, Proc & Prod Dev Dept, Campinas, SP - Brazil

^[2] Fed Univ Santa Catarina UFSC, Dept Chem Engn & Food Engn, Florianopolis, SC - Brazil

^[3] Sao Paulo State Univ UNESP, Coll Agr Sci, Dept Bioproc & Biotechnol, Botucatu, SP - Brazil

• Document type: Journal article
• Source: INDUSTRIAL CROPS AND PRODUCTS; v. 169, OCT 1 2021.
• Web of Science Citations: 3

Abstract

Despite the water consumption of the first-generation ethanol (1G) production from sugarcane being widely studied, there are only a few experimental studies on water consumption - especially in the pulp washing - in second generation (2G) ethanol production. A quantitative evaluation of water wash consumption in the pre-treatment with the protic ionic liquid (PIL) monoethanolammonium acetate {[}MEM {[}OAc] has shown that a water consumption between 600-1,000 wt% for two temperatures, 25 and 80 degrees C, decreased overall enzyme performance in saccharification compared to the full wash sample. The best condition in terms of high yield and low water consumption was found to be 800 wt%/80 degrees C, with up to 83 and 61.8 % of glucose and xylose yields against 97.9 and 85 % for the full wash sample. However, despite the full wash still presenting a superior ethanol yield, 87.4 %, the best condition with limited amount of water, 800 wt%/80 degrees C, also had a high ethanol yield of 86.1 %. Mass balance calculations confirmed that optimized {[}MEM {[}OAc] pretreatment with 800 wt%/80 degrees C and full wash conditions provided the highest ethanol yield per ton of biomass amongst several types of PIL and non-PIL pretreatments, 299 and 379 L 2G ethanol per ton of biomass, with an estimated water consumption of 56 and 647 ton, paving the way for an effective and more water-sustainable pretreatment technology for 2G ethanol production. (AU)

• FAPESP's process: 15/20630-4 - Biorefinery development integrated to a bioethanol sugar cane plant with zero CO2 emission: routes to convert renewable resources to bio-products and bio-electricity
• Grantee: Rubens Maciel Filho
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 16/06142-0 - Strategies to improve the performance of the second generation ethanol production process
• Grantee: Aline Carvalho da Costa
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 15/14042-2 - Evaluation of Sugarcane Bagasse Pretreatment Process with Protic Ionic Liquids for Cellulosic Ethanol Production
• Grantee: Pedro Yoritomo Souza Nakasu
• Support Opportunities: Scholarships in Brazil - Doctorate