Insight into the evolution of the proton concentration during autohydrolysis and dilute-acid hydrolysis of hemicellulose

Table 2 A summary of the experimental conditions tested

Experiment	Series	L:W (wt / wt)	\({[H{^+}]_o}\) (pH)	T _b (°C)	t (min)
Temp. measurement	1	water only	7.1	120	0 < t <45
	2	water only	7.1	150	0 < t <45
	3	6.5:1	7.1	140	0 < t <45
	4	6.5:1	7.1	150	0 < t <45
	5	6.5:1	7.1	160	0 < t <45
	6	6.5:1	7.1	180	0 < t <45
	7	8:1	7.1	120	0 < t <45
	8	8:1	7.1	150	0 < t <45
	9	10:1	7.1	120	0 < t <45
	10	10:1	7.1	150	0 < t <45
Long-time behavior	11	6.5:1	1.3–6.8	160	t >315
	12	6.5:1	1.5–7.1	180	t >315
Room temperature	13	6.5:1	1.5	23	0 < t < 1155
	14	6.5:1	2.9	23	0 < t <1155
	15	6.5:1	5.0	23	0 < t <1155
	16	6.5:1	6.0	23	0 < t <1155
Elevated temperature	17	6.5:1	1.7	160	0 < t <360
	18	6.5:1	1.5	160	0 < t <390
	19	6.5:1	7.2	160	0 < t <390
	20	6.5:1	7.2	180	0 < t <390
	21	6.5:1	3.5	160	0 < t <360

In series 1 through 10, the temperature was sampled at a frequency of 1 Hz. In series 11–12 a total of 18 samples were measured at times ranging from 315 to 390 min. In series 13–14, four different initial pHs were tested and approximately 11 samples, obtained at different times, were measured. In this case \(T_b\) is defined as the oil bath temperature. L:W and t refer to liquid to wood ratio and time

ISSN: 2731-3654