A biorefinery scheme to fractionate bamboo into high-grade dissolving pulp and ethanol

Table 4 Yield, hemicellulose content, α-cellulose, ash content, brightness, reactivity, and viscosity of bleached (D-E-D) bamboo dissolving pulp

Sample	Yield^a (%)	Hemicellulose^b (%)	α-cellulose^b (%)	Ash^b (%)	Brightness (% ISO)	Viscosity (mPa s)	Fock reactivity (%)
Control	36.2	7.49 ± 0.12	92.06 ± 0.03	0.09 ± 0.01	85.6 ± 0.1	6.94 ± 0.04	22.3 ± 0.78
Xylanase^c and 4% CCE	33.8	3.87 ± 0.11	95.72 ± 0.06	0.08 ± 0.02	86.2 ± 0.1	6.45 ± 0.02	32.6 ± 0.24
Xylanase^c and 6% CCE	32.6	2.45 ± 0.06	97.18 ± 0.13	0.06 ± 0.01	86.7 ± 0.1	6.39 ± 0.02	43.4 ± 0.45
Xylanase^c and 8% CCE	31.4	1.58 ± 0.10	97.82 ± 0.10	0.07 ± 0.02	87.6 ± 0.1	6.24 ± 0.01	23.4 ± 0.58
Xylanase^d and 4% CCE	32.0	2.67 ± 0.08	96.98 ± 0.15	0.05 ± 0.01	86.9 ± 0.1	6.38 ± 0.02	34.6 ± 0.62
Xylanase^d and 6% CCE	31.8	1.36 ± 0.05	97.84 ± 0.11	0.08 ± 0.02	87.8 ± 0.1	6.25 ± 0.01	44.7 ± 0.25
Xylanase^d and 8% CCE	30.2	1.14 ± 0.07	98.06 ± 0.05	0.06 ± 0.01	88.3 ± 0.1	6.12 ± 0.02	22.1 ± 0.93

4–8% CCE means the NaOH concentration used for cold caustic extraction
Control the pulp was treated as the same operations used for xylanase treatment without using xylanase and NaOH
^aCalculations were based on original oven-dried chip mass
^bCalculations were based on oven-dried corresponding pulp mass
^cPulp was treated with xylanase 4 U/g o.d. pulp at 60 °C and pH 6 for 6 h
^dPulp was treated with xylanase 8 U/g o.d. pulp at 60 °C and pH 6 for 6 h

ISSN: 2731-3654