Since acetate and formate have a dissociation constant (pKa) of 4.756 and
3.751, respectively (Weng et al., 2010), our low separation factors
over glucose of acetate and formate would be due to the high pH
4.9 used. pH 4.9 was specifically choosen to aid fermentation by
S. cerevisiae. In addition, a lower pressure (1.5–2.0 MPa) was used
in this study to minimize usage of pressurizing energy. Furfural
and HMF [molecular weight: 96.08 and 126.11 (g mol–1), respectively]
were poorly concentrated from the feed by NTR-729HF,
NTR-7250, and ESNA3, compared with glucose and xylose