Material Science and Engineering Research Group, Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Jl.Ganesha 10, Bandung 40132, Indonesia.
Energy Conversion Research Group, Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Jl.Ganesha 10, Bandung 40132, Indonesia.
Molecules. 2021 Jan 27;26(3):650. doi: 10.3390/molecules26030650.
Lignin isolated from black liquor waste was studied in this research to be utilized as binderless, all-lignin briquette, with a calorific value in the range of 5670-5876 kcal/kg. Isolation of lignin from black liquor was conducted using the acid precipitation method. Sulfuric acid, citric acid, and acetic acid were used to maintain the pH level, which varied from 5 to 2 for the precipitation process. The influence of these isolation conditions on the characteristic of lignin and the properties of the resulted briquette was evaluated through the Klasson method, proximate analysis, ultimate analysis, Fourier Transform Infrared (FTIR), adiabatic bomb calorimeter, density measurement, and Drop Shatter Index (DSI) testing. The finding showed that the lignin isolated using citric acid maintained to pH 3 resulted in briquette with 72% fixed carbon content, excellent 99.7% DSI, and a calorific value equivalent to coal-based briquette.
本研究以黑液废水中提取的木质素为原料，制备无黏结剂全木质素型煤，其热值范围为 5670-5876 千卡/千克。采用酸沉淀法从黑液中分离木质素，使用硫酸、柠檬酸和乙酸来维持 pH 值，沉淀过程的 pH 值范围为 5-2。通过 Klasson 法、工业分析、元素分析、傅里叶变换红外光谱（FTIR）、绝热弹式量热计、密度测量和落球冲击指数（DSI）测试评估了这些分离条件对木质素特性和型煤性能的影响。结果表明，使用柠檬酸将 pH 值保持在 3 时，分离得到的木质素制备的型煤固定碳含量为 72%，DSI 高达 99.7%，热值与煤基型煤相当。
