Table 1.
Element composition of HTC lignin with different solid-liquid ratios

Temp. (℃) / Time (h)	Solid-liquid ratio	Elemental content (wt%)			O/C	H/C
		C	O1)	H
Control 1	-	62.86	30.84	5.94	0.37	1.13
Control 2	-	61.97	31.69	5.98	0.38	1.16
Control 3	-	60.67	33.50	5.83	0.41	1.15
200 ℃ / 3h	1/50	64.81	29.73	5.45	0.34	1.01
	2/50	65.61	28.79	5.59	0.33	1.02
	3/50	64.74	29.77	5.49	0.34	1.02
200 ℃ / 5h	1/50	64.73	29.85	5.41	0.35	1.00
	2/50	64.39	30.10	5.51	0.35	1.03
	3/50	65.90	28.52	5.58	0.32	1.02
200 ℃ / 10h	1/50	65.09	29.53	5.37	0.34	0.99
	2/50	65.46	28.97	5.56	0.33	1.02
	3/50	65.59	28.87	5.53	0.33	1.01
1) O (wt%) = 100 – (C + H + N wt%)