Lignin and Cellulose Extraction from Vietnam’s Rice Straw Using Ultrasound-Assisted Alkaline Treatment Method

Table 2

The yield of lignin obtained by alkaline and ultrasonic-assisted alkaline extraction of rice straw with 2 M NaOH at 90°C for 1.5 h.

	Ultrasonic time, min
Yields, %	0	10	20	30	40
Lignin	72.8	72.9	78.6	84.7	84.9