Jiang Q.-P.,Baoding Research Institute of Environmental and Protection |
Wang F.-W.,Service Center for Baoding Qingyi Environmental Science and Technology |
Zhang Y.,Baoding Research Institute of Environmental and Protection
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2013
A process using phosphoric acid to precipitate lignin from straw pulping black liquor was investigated, the conditions were optimized, as pH=3, T=60°C, the yield of the precipitated lignin was 87%. The precipitated lignins at different pH were analyzed by infrared spectrum and ultraviolet spectral. The components of acid-precipitated lignin at pH=3 was analyzed, the result indicated that the precipitated lignin has the characteristic of fertilizer.