Abstract
Isolation and Purification of Alfa Grass Kraft Lignin from Industrial Waste
Highlights
Alfa grass (Stipa Tenacissima) is widely available lignocellulosic biomass in Tunisia, which occupied more than 380 thousand hectares in different regions (Kasserine, Sidi Bouzid, Gafsa and Kairouan) [1,2]
Selective precipitation was achieved by decreasing the pH of the black liquor and the purity of the resulting fraction was carried out by UV spectroscopy and TGA
When the black liquor is neutralized with the acid and its pH value is gradually decreased, the electronic substitution reaction occurs and the alkali lignin colloid is damaged at the same time, which results in generating insoluble lignin [20,21]
Summary
Alfa grass (Stipa Tenacissima) is widely available lignocellulosic biomass in Tunisia, which occupied more than 380 thousand hectares in different regions (Kasserine, Sidi Bouzid, Gafsa and Kairouan) [1,2]. The kraft lignin has been recovered from black liquor, in laboratory or industrial plants, by precipitation with mineral acids like sulphuric or hydrochloric acids. In this study the main focus on the method of lignin purification to obtain material with higher purity.
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