Analysis of lignin content in alkaline treated hemp fibers: thermogravimetric studies and determination of kinetics of different decomposition steps

Hemp (Cannabis sativa L.) is a plant of which, its ease cultivation, structure and properties, provide it great potential for industrial applications; nevertheless, the unfavorable content lignin complicates processing, especially in textile area. Thus, an appropriate knowledge delignification process would lead to treating hemp fibers as cotton fibers. In this work, has been treated with alkaline liquor [NaOH 1 M] at 110 °C during different times afterwards, substrates were chemically characterized order determine their also analyzed by thermogravimetry (TGA). Through correlation analysis, relationship between content, onset temperature cellulose decomposition loss mass steps established. A hyperbolic kinetic model explain influence treatment time on four samples TGA up 600 developed. Although found that degradation occurred across entire range, results have shown become clearly relevant Step2 (180.5 °C-273.5 °C) where fraction 10 16% was degraded, Step3 273.5 °C-396.5 mainly decomposed 20% degraded.