Table 2.

Glucan and xylan recovery of the dry pretreatment in the helically agitated reactor

Pretreatment conditions	Cellulose content before pretreatment (%)	Xylan content before pretreatment (%)	Glucan recovery (%)	Xylan recovery (%)
Raw corn stover	37.15 ± 0.22	19.86 ± 0.56	-	-
Changing temperature
165°C , 2.5%, 3 minutes	38.04 ± 2.04	8.57 ± 2.26	100.09	94.24
175°C , 2.5%, 3 minutes	37.23 ± 0.75	5.28 ± 0.02	96.69	79.32
185°C , 2.5%, 3 minutes	40.93 ± 0.06	2.93 ± 0.16	96.50	62.00
Changing acid usage
185°C, 1.5%, 3 minutes	37.71 ± 1.07	6.48 ± 0.18	92.05	78.89
185°C, 2.0%, 3 minutes	37.41 ± 0.06	4.16 ± 0.08	96.63	74.91
185°C, 2.5%, 3 minutes	40.93 ± 0.06	2.93 ± 0.16	96.50	62.00
185°C, 3.0%, 3 minutes	38.48 ± 0.40	2.52 ± 0.17	73.97	43.18
185°C, 3.5%, 3 minutes	36.85 ± 1.25	1.79 ± 0.21	75.12	36.37
185°C, 4.0%, 3 minutes	35.98 ± 1.10	1.05 ± 0.10	65.53	29.75
Changing residue time
185°C, 2.5%, 1 minute	41.52 ± 5.88	4.06 ± 0.41	92.71	64.08
185°C, 2.5%, 3 minutes	40.93 ± 0.06	2.93 ± 0.16	96.50	62.00
185°C, 2.5%, 5 minutes	38.54 ± 1.88	2.93 ± 0.08	82.78	57.29
185°C, 2.5%, 10 minutes	39.29 ± 0.75	2.21 ± 0.22	76.44	42.96
Changing agitation rate
185°C, 2.5%, 3 minutes, 10 rpm	40.23 ± 2.59	3.00 ± 0.19	84.81	54.03
185°C, 2.5%, 3 minutes, 30 rpm	38.41 ± 0.58	2.86 ± 0.87	93.20	64.19
185°C, 2.5%, 3 minutes, 50 rpm	40.93 ± 0.06	2.93 ± 0.16	96.50	62.00