Extraction and Characterization of Fiber and Cellulose from Ethiopian Linseed Straw: Determination of Retting Period and Optimization of Multi-Step Alkaline Peroxide Process

Flax is a commercial crop grown in many parts of the world both for its seeds and for its fibers. The seed-based flax variety (linseed) is considered less for its fiber after the seed is extracted. In this study, linseed straw was utilized and processed to extract fiber and cellulose through optimization of retting time and a multi-step alkaline peroxide extraction process using the Taguchi design of experiment (DOE). Effects of retting duration on fiber properties as well as effects of solvent concentration, reaction temperature, and time on removal of non-cellulosic fiber components were studied using the gravimetric technique, Fourier transform infrared (FTIR) spectroscopy and thermal studies. Based on these findings, retting for 216 h at room temperature should offer adequate retting efficiency and fiber characteristics; 70% cellulose yield was extracted successfully from linseed straw fiber using 75% ethanol-toluene at 98 degrees C for 4 h, 6% NaOH at 75 degrees C for 30 min, and 6% H2O2 at 90 degrees C for 120 min.

Automated summary

This study focused on extracting fiber and cellulose from linseed straw through optimization of retting time and a multi-step alkaline peroxide extraction process. The results showed that retting for 216 hours at room temperature offered adequate retting efficiency and fiber characteristics. The cellulose yield of 70% was successfully extracted using specific conditions of solvent concentration, reaction temperature, and time.