There are several types of lignin, defined by their sources (e.g. hardwood, softwood, forestry, agriculture, etc.) and extraction processes (kraft, organosolv, soda, steam explosion, etc.). They are lignosulfonate, kraft lignin, organosolv lignin, hydrolysis lignin and alkali lignin.
Lignin solubility in the solvent will depend on its source, type, size, and extraction processes etc. Probably, the most conventional solvent for lignin would be an alkali solution. Beside alkali solutions, organic solvents, such as DMF, acetone/water mixture would be utilized as lignin solvent. Some lignins may dissolve in water as well.
If you look at the structure, you can see the phenolic groups. So it should be soluble in basic conditions like 10%NaOH solution, ammoia solution etc...
If you're looking to remove lignin without denaturing it, and get a representative amount of it, I strongly suggest you to follow the protocol in this paper "http://www.sciencedirect.com/science/article/pii/S0926669015301679"
But if you're looking to just remove it for the sake of cellulose and hemicellulose, alkali treatment is the best way to remove it.
There are several types of lignin, defined by their sources (e.g. hardwood, softwood, forestry, agriculture, etc.) and extraction processes (kraft, organosolv, soda, steam explosion, etc.). They are lignosulfonate, kraft lignin, organosolv lignin, hydrolysis lignin and alkali lignin.
Lignin solubility in the solvent will depend on its source, type, size, and extraction processes etc. Probably, the most conventional solvent for lignin would be an alkali solution. Beside alkali solutions, organic solvents, such as DMF, acetone/water mixture would be utilized as lignin solvent. Some lignins may dissolve in water as well.
Dear Srimanta,
Solvent choice is dictated by its stability at depolymerization conditions and lignin solubility in the solvent.
We recently published article on 'Depolymerization of Dealkaline Lignin'. We could able to dissolve the dealkaline lignin in methanol+water mixture.
You can check our article for more details.
Article Zirconium Incorporated Mesoporous Silicates Show Remarkable ...
Please let me know, if have more questions.
All the best!
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