Totally chlorine-free bleaching of prehydrolysis soda pulp from plantation hardwoods consisting of various lignin structures

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Carbohydrate composition of PHLs with various prehydrolysis conditions

Prehydrolysis time (h)	Prehydrolysis temperature (°C)	pH	Freeze-dried solid (%)^a	Glucan (%)^a	Xylan (%)^a	Others (%)^a
1.5	150	3.3	6.0	0.03	2.0	4.0
2.0	150	3.1	7.3	0.05	2.9	3.0
2.5	150	3.0	8.4	0.07	7.2	1.2
3.0	150	2.8	10.4	0.12	7.8	2.5
2.5	155	2.9	9.7	0.28	7.9	1.5
2.5	160	2.8	11.0	0.36	8.2	2.2
2.5	165	2.8	11.5	0.43	7.8	2.8
2.5	170	2.7	12.1	0.61	7.6	3.1

^aBased on raw material (acid-insoluble lignin content: 22.2%, acid-soluble lignin content: 5.4%, glucan content: 49.4%, xylan content: 15.3%)