Ash thermochemical behaviors of bamboo lignin from kraft pulping: Influence of washing process

To improve the efficiency and safety of the thermochemical conversion process of lignin residues from the bamboo paper factory, the residual lignin of black liquor was precipitated by concentrated hydrochloric acid. It was further washed using a hydrochloric acid solution with a pH of 2 and deionized water to obtain lignin samples. The ash of lignin samples with different washing processes was prepared using a muffle furnace according to...