%0 Conference Proceedings
%A Natthatida Kunwong
%A Navadol Laosiripojana
%A Verawat Champreda
%T Optimization of Lignin Separation Process from Black Liquor Using Strong Acids and Supercritical CO₂
%B The First NZAAR International Event Series on Natural and Built Environment, Cities, Sustainability and Advanced Engineering
%C Putrajaya, Malaysia
%D 2016
%8 26 June 2016
%P 106-107
%I New Zealand Academy of Applied Research
%@ 2463-5979
%K Lignin
%K Black liquor
%K Acidification process
%K supercritical CO 2
%K lignin Precipitation
%U https://gdiacademy.org/nzaar/EERE-16-45.html
%X Black liquor is the major waste from pulp and paper industry. Generally, it contains the amount of lignin fraction around 10-20% depending on the pulping process. The extracted lignin can be efficiently converted to several value-added products. In this work, lignin was comparatively extracted from black liquor by acidification and suband super-critical CO 2 . For the first method, lignin precipitation was achieved by decreasing alkali black liquor pH from 10 to 2 with strong acid (H 2 SO 4 and HCl) then filtrate with Glass fiber filter to separated solid and liquid phase. In the second technique, the acidification using CO 2 under sub and supercritical conditions which obtain pH 5 then use membrane to separated liquid and solid phase. The lignin precipitated percentages from each technique were measured and optimized for enhancing the highest yields of precipitated lignin.