Effect of Parenchymal Cell Content on Soda-AQ Cooking and ECF Bleaching of Bamboo Dissolving Pulp
With 2-year-old Phyllostachys pubescens as the material,the study uses prehydrolytic sulfate process and defibrination treatment to separate parenchyma cells(PCs)and fiber cells(FCs)and analyze the effect of PC content on SAQ cooking and elemental chlorine-free(ECF)bleaching of bamboo dissolving pulp(BDP)by controlling the different mass rates between PCs and FCs.The results show that,after the Soda-AQ cooking,the yield,α-cellulose,Kappa number,residual alkali and intrinsic viscosity of bamboo pulp decrease significantly with the increase of PC content,while the ash,iron content and whiteness of bamboo pulp increase with the increase of PC content.During ECF bleaching,the BDP's yield,alkali resistance and intrinsic viscosity decrease significantly with the increase of PC content,while its iron content,S10 and S18 increase significantly.No significant changes happen in whiteness,ash and dichloromethane-extracted of the pulp,which indicates that the BDP basically meets the industry standard requirements.To sum up,PCs have greater influence on the process of SAQ than on ECF bleaching process,and the lower the PC content is,the better uniformity and the higher cellulose content the BDP will have.The BDP with less than 10%PC content is suitable for the production of viscose fibers.However,the removal of iron ions and low molecular weight alkali-soluble matters is still the key to the production of BDP for Lyocell fibers.
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