The influence of solid/liquid separation techniques on the sugar yield in two-step dilute acid hydrolysis of softwood followed by enzymatic hydrolysis

Table 2 Composition of the pretreated material after the first and second acid hydrolysis steps, expressed as % of dry matter

Pretreatment¹	Glucan	Xylan	Galactan	Arabinan	Mannan	Lignin (acid-soluble)	Lignin (insoluble)
First step, +W	52.7	2.1	1.0	0.7	2.0	0.3	37.8
First step, -W	58.7	0.0	1.9	0.0	1.5	0.7	38.3
Second step, P+W	56.6	0.0	0.9	0.7	1.6	0.3	40.9
Second step, F+W	57.8	0.0	0.9	0.8	1.5	0.3	39.8
Second step, P-W	54.8	0.0	1.8	0.0	1.3	0.6	42.5
Second step, F-W	53.9	0.0	1.6	0.0	1.3	0.6	43.8

¹ Experimental designs: with washing (+W) and without washing (-W) of pressed (P) and vacuum-filtered (F) material.

ISSN: 2731-3654