Year: 2025
Type: article
Abstract: The aim of this work is to optimize the alkaline hydrolysis of rice straw lignocellulose using kanwa, with the goal of producing bioethanol. The alkaline pretreatment was carried out using a saline rock from North Cameroon (kanwa) under the following experimental conditions: temperature between 170 and 200°C, and duration between 20 and 60 minutes. Characterization revealed that the local material contained 91.75 ± 0.48% dry matter, 8.25 ± 0.48% water, 31.22 ± 2.04% cellulose, 9.92 ± 2.46% lignin, and 17.72 ± 0.51% hemicellulose. The optimization design (central composite design) used to validate the reducing sugar models was based on the following indicators: Adjusted R² (99.36), AADM (12%), Bf (1.004), and Af (1.049). The optimal pretreatment conditions were 1.681, -1, and 0.808 in terms of temperature, time, and kanwa concentration, resulting in the maximum extraction of 49% cellulose, 2.4% hemicellulose, and 19.3% lignin. A concentration of 4.50 ± 0.02 mg/mL of reducing sugars was obtained under the conditions of 55°C for 72 hours, followed by centrifugation at 4000 rpm for 15 minutes. This resulted in an ethanol yield of 32% and a lower calorific value of 9184 ± 0.01 J/g.
DOI: 10.63156/mjes01
Institution: University of Douala
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W4409543126