MATEC Web Conf.
Volume 268, 2019The 25th Regional Symposium on Chemical Engineering (RSCE 2018)
|Number of page(s)||4|
|Section||Fundamentals of Chemical Engineering|
|Published online||20 February 2019|
Ultimate pretreatment of lignocellulose in bioethanol production by combining both acidic and alkaline pretreatment
Laboratory of Biofuel and Biomass Research, Vietnam National University of Ho Chi Minh City, University of Technology, 268 Ly Thuong Kiet st. ward 14, district 10, Ho Chi Minh City, S. R. Vietnam
Corresponding author: email@example.com
Alkaline pretreatment has been known as the most popular method to process lignocellulosic materials for bioethanol production due to its simplicity and high efficiency. However, the waste water of the process has a very high basicity, which requires neutralization with acids upon further disposal. In this study, rubber wood saw dust (Hevea brasiliensis) was employed as lignocellulosic material and its pretreatment was inspected with both diluted H2SO4 and NaOH in different combination ways. Hereby, acid was used not only for waste water neutralization but also to contribute to lignin removal. Analysis results showed that an aqueous solution of 2.0 - 2.5 wt.% H2SO4 can be used to treat the biomass followed by alkaline pretreatment. By this so-called combo-pretreatment technique, cellulose was well preserved without significant hydrolysis while the final pretreatment efficiency was up to 63.0%, compared to 48.2% of using only the alkaline solution and 13.7% of using only the acidic solution. Finally, alkaline waste water can be mixed to be neutralized with acidic waste water from the two previous steps. This innovated technique improved the pretreatment efficiency almost without increasing in chemical cost.
© The Authors, published by EDP Sciences, 2019
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