Extraction of lignin with lignoboost process and production of water-soluble sulfonated derivatives from lignin of bagasse soda black liquor

Document Type : Research Paper

Authors

1 Ph.D., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

2 Associate Prof., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

3 Prof., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

4 Assistant prof., Department of analytical chemistry, University of Isfahan, Isfahan, Iran

Abstract

An important source of lignin is the spent pulping liquor, known as black liquor, due to high volume produced of black liquor the treatment of it is very important for economic and environmental reasons. Alkali lignin can be extracted from black liquor in pulping process to produce value-added chemicals, but its limited water solubility hampers its end-use applications. In this work, at first bagasse soda lignin extracted form black liquor with lignoboost process and was modified with sodium sulfite under three different treatment conditions (75°C , 6 h and 90 °C , 6 h and 90 °C , 4 h) . The structure changes by using FTIR method and molecular weight by SEC, thermal behavior by TGA and elemental analysis of the product by CHNS were assessed. The results showed the sulfonated lignins are different from unmodified lignin in the amount of sulfonate group and have more sulfonate groups. Also the molecular weight, Solubility and thermal behavior in sulfonated lignins increased due to sulfonate group compared to unmodified lignin.

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References

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Iranian Journal of Wood and Paper Industries
Volume 10, Issue 2
August 2019
Pages 237-247

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