Consecutively Preparing D-Xylose, Organosolv Lignin, and Amorphous Ultrafine Silica from Rice Husk

Table 5

Contents of metal oxide in silica obtained from the rice husk and residue 2 under the optimum conditions of ethanediol pulping.

Metal oxide (wt.%)	K2O	Na2O	CaO	MgO	Al2O3	Fe2O3	CuO	MnO2	ZnO	Sum
From RH	0.9808	0.3689	7.9216	1.7877	0.4530	0.3158	0.0047	0.1121	0.1145	12.0616
From residue 2	0.0113	0.0145	0.0235	0.0011	0.0124	0.0035	0.0017	0.0000	0.0036	0.0716