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==== Sulphite salt ==== | ==== Sulphite salt ==== | ||
Similar to [[Pulping#Sulphite pulping|sulphite pulping]], sulphites can be added to acid hydrolysis to aid in lignin removal. | |||
=== Solvent === | === Solvent === | ||
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==== Ionic Liquids ==== | ==== Ionic Liquids ==== | ||
Ionic liquids are '''solvents''' that can be used for biomass pretreatment, fractionation, and dissolution. During | Ionic liquids are '''solvents''' that can be used for biomass pretreatment, fractionation, and dissolution. During ionic liquid pretreatment, a cellulose-rich fraction can be generated through the degradation and removal of a large portion of lignin and hemicellulose <ref>{{Cite web|Author=Moyer, P., Kim, K., Abdoulmoumine, N. et al.|year=2018|title=Structural changes in lignocellulosic biomass during activation with ionic liquids comprising 3-methylimidazolium cations and carboxylate anions|e-pub date=27/09/2018|date accessed=06/12/2021|url=https://biotechnologyforbiofuels.biomedcentral.com/articles/10.1186/s13068-018-1263-0}}</ref> | ||
=== Subcritical water === | === Subcritical water === |