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| Optimal Conditions of Lignin Precipitation from Straw Pulping Black Liquor by Using Phosphoric Acid |
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| DOI：10.11980/j.issn.0254-508X.2013.02.017 |
| Key Words:phosphoric acid straw pulping black liquor precipitate lignin |
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| Abstract:A process using phosphoric acid to precipitate lignin from straw pulping black liquor was investigated, the conditions were optimized, as pH=3, T=60℃, 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. |
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