Influence of Ethanol Organosolv Pulping Conditions on Physicochemical Lignin Properties of European Larch

Table 2

Process parameters, mass flows of the organosolv extraction experiments, and lignin content of the solid substrate.

	Process parameters^a			Mass flows (% w/w)			KL of substrate
	T^b (K)	C (wt%.)	CSF	S	EOL	ASL	(% w/w)
OS-A	440	1.10	1.65	47.49	16.36	4.62	18.16
OS-B	445	1.10	1.80	44.52	17.61	4.77	16.54
OS-C	450	1.10	1.95	38.56	19.12	5.40	14.16
OS-D	455	0.75	1.93	38.68	19.06	5.45	14.14
OS-E	455	1.10	2.10	34.14	20.01	5.64	16.05
OS-F	460	1.10	2.24	29.74	20.83	5.85	19.76
OS-G	460	1.65	2.42	22.42	21.82	6.14	29.24
AC-OS	460	0.00	—	80.11	6.47	3.05	24.59

^a36 g of feedstock (on dry basis), 250 mL of 75% aq. ethanol, and 30 min residence time. ^bT, temperature; C, catalyst loading on dry wood basis; CSF, combined severity factor; S, solid substrate; EOL, ethanol organosolv lignin; ASL, acid-soluble lignin in the aqueous phase; KL, Klason lignin; AC-OS, autocatalyzed organosolv.