Limerick Pulp and Paper Centre and Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
Limerick Pulp and Paper Centre and Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada; Pulp and Paper Research Division, BCSIR Laboratories, Dhaka, Dhaka 1205, Bangladesh.
Bioresour Technol. 2014 Mar;155:111-5. doi: 10.1016/j.biortech.2013.12.096. Epub 2013 Dec 30.
This work investigated the feasibility of recovering and concentrating sugars and acetic acid (HAc) from prehydrolysis liquor (PHL) of the kraft-based dissolving pulp process prior to fermentation of hemicellulosic sugars, by the combination of activated carbon adsorption, nanofiltration (NF) and reverse osmosis (RO) processes. To reduce the fouling PHL was subjected to adsorption on activated carbon, then the treated PHL (TPHL) passed through a nanofiltration (NF DK) membrane to retain the sugars, and the permeate of acetic acid rich solution was passed through a reverse osmosis membrane (RO SG). It was found that for NF process sugars were concentrated from 48 to 227g/L at a volume reduction factor (VRF) of 5 while 80 to 90% of acetic acid was permeated. For the reverse osmosis process, 68% of acetic acid retention was achieved at pH 4.3 and 500 psi pressure and the HAc concentration increased from 10 to 50g/L.
本工作研究了在发酵半纤维素糖之前，通过活性炭吸附、纳滤（NF）和反渗透（RO）组合工艺，从硫酸盐法制浆溶解浆过程的预水解液（PHL）中回收和浓缩糖和乙酸（HAc）的可行性。为了减少污染，对 PHL 进行了活性炭吸附，然后将处理后的 PHL（TPHL）通过纳滤（NF DK）膜，以保留糖，而富含乙酸的渗透液则通过反渗透膜（RO SG）。结果发现，对于 NF 过程，在体积减少因子（VRF）为 5 的情况下，糖的浓度从 48 增加到 227g/L，而 80%到 90%的乙酸被渗透。对于反渗透过程，在 pH 值为 4.3 和 500 psi 压力下，乙酸的保留率为 68%，HAc 浓度从 10 增加到 50g/L。
