Optimization of flax fiber separation by leaching

The abilities of four chelators to separate bast fibers of non-retted oilse ed flax from each other and the core and cuticle have been investigated at different pH level. EDTAand DTPA separate fibers efficiency at pH 10. Addit ion of a strong detergent (Sodium dodecyl sulphate, SDS) or sodium chloride further increased the fiber separation and so delignifying compounds hydro gen peroxide and sodium sulfite. A mixture of EDTA, SDS and hydrogen peroxi de gave a complete fiber separation within 2 h at 70 degrees and pH 10. The fibers in the woody core of the flax straw did not separate under these co nditions. The mechanistic background to fiber separation is discussed.