Comparative study of acid- and alkali-catalyzed 1,4-butanediol pretreatment for co-production of fermentable sugars and value-added lignin compounds

Table 2 Effect of organosolv pretreatment on carbohydrate retention and lignin removal

	Cellulose retention in WIF (%)	Hemicellulose retention in WIF (%)	Hemicellulose removal (%)	Lignin removal (%)	Delignification selectivity	Cellulose accessibility (mg/g)
HCl-Ethanol 30 mM	96.63	62.89	37.11	39.30	1.10	134.76
HCl-Ethanol 40 mM	92.90	36.17	63.83	59.66	1.01	181.33
HCl-Ethanol 50 mM	90.54	27.23	72.77	66.51	0.95	197.58
BDO-No catalyst	98.77	87.57	12.43	22.20	2.07	92.39
HCl-BDO 10 mM	99.43	81.15	18.85	41.95	2.95	103.01
HCl-BDO 20 mM	96.63	49.06	50.94	63.92	1.55	198.41
HCl-BDO 30 mM	96.58	33.69	66.31	72.34	1.39	256.47
HCl-BDO 40 mM	92.30	30.35	69.65	82.04	1.34	305.51
HCl-BDO 50 mM	90.25	11.51	88.49	90.00	1.15	326.16
NaOH-BDO 250 mM	96.65	58.68	41.32	50.20	1.54	173.27
NaOH-BDO 300 mM	96.16	52.28	47.72	58.99	1.48	186.84
NaOH-BDO 350 mM	95.35	46.54	53.46	63.72	1.41	201.46
NaOH-BDO 400 mM	93.14	39.09	60.91	70.60	1.31	223.76
NaOH-BDO 450 mM	89.79	31.91	68.09	72.69	1.13	247.90

ISSN: 2731-3654