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ժҪ �о��ͼ��ʹ��ݽ��Һ�� ,��ľ�� ,��ҺŨ��1 0 0g L�� 1 1 0g L ,��H2 SO4 �ﵽ 1 5g L�� 30min ,30��ȡ�� ,��ˮ��ȡ�� ,�پ�Ũ��䶳��ᾧ��øߴ��

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Abstract�� Alkaline straw-pulp black liquor is leavened by alkaliproof bacterium.The lignin is precipitated by acidulation.The solution is concentrated into [C\-6H\- 12 O\-6]=100g/L-110g/L.Then [H\-2SO\-4]=15g/L is added,and boiled 30min.Then levulinic acid is extracted by 2-octanol at 30��,counterextracted by water.The soltuion of levulinic acid is concentrated,rectified,crystallized by cold method.The pure levulinic acid is obtained.

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Received 2002-03-15; published 2002-03-15

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��.��ֽ��Һ��ȡ��о�[J]. ��ѧ��ҵ�빤��, 2002,19(2): 163-166

HE Zhu-sheng .Extraction of Levulinic Acid from Paper-making Black Liquor[J]. Chemcial Industry and Engineering, 2002,19(2): 163-166