Characterisation of Kraft lignin separated by gradient acid precipitation

Hardwood and softwood kraft lignins fractionation by simple sequential acid precipitation

“…The ash in kraft lignin is probably related to its sodium content [20], which derives from the chemistry of the cooking process. Considering that sodium is the counter ion of soluble lignin, and that during the sequential pH precipitation (mainly for hardwood) richer ash content was detected in the higher pH, this suggests that a partial protonation of lignin occurred with more ash content.…”

“…The main fractionation methods were related to the extraction of lignin with different organic solvents [14,15], ultrafiltration by membrane technology [16,17], and fractionation by acid precipitation [18][19][20][21]. Acid precipitation is a common method that extracts lignin from black liquor, decreasing the pH gradually by the addition of a strong acid [17,22,23].…”

Separation of Cell Wall Components by Kraft Pulping and their Utilization for Oil Absorption

“…After waiting for the full reaction, the mixture was centrifuged for 15 min at 4000 rpm, and the precipitate was collected. The supernatant liquid was further neutralized stepwise with 10% H2SO4 solution until the pH value reached 5, 4, 3, and 2, and the precipitate was collected (Dong and Liu 2012;Wang and Chen 2013;Santos et al 2014). In addition, with the same amount of black liquor, 10% H2SO4 was to neutralize the mixture with stirring until the pH directly fell to 2, the precipitate was collected by centrifugation.…”

Improving the perspective of raw eucalyptus kraft pulp for industrial applications through autochthonous bacterial mediated delignification

“…Pseudomonas genera are the well known phenol degrader (Bandyopadhyay et al, 1998), appeared to utilize KL which itself a complex polyphenolic compound (Santos et al, 2014). Interestingly, the other lesser known Planococcus sp.TRC1 showed comparatively higher tolerance and biodegradation capacity of KL than P. fluorescens NITDPY.…”