Valorisation of sodium lignosulfonate by ultrafiltration of spent sulphite liquor using commercial polyethersulfone membrane

IF 0.9 Q4 ENGINEERING, CHEMICAL
K. Nath, V. B. Patel, H. Dave, S. Panchani
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引用次数: 0

Abstract

ABSTRACT Ultrafiltration of spent sulphite liquor, generated from a laboratory sulphite pulping using chopped stems of Prosopis juliflora, was carried out to recover sodium lignosulfonate (SLS). A commercial hydrophilised polyethersulfone flat-sheet membrane with a molecular weight cut-off of 5 kD was used for the experiments. Effects of the feed dilution factor on the permeate flux were observed, and actual solute rejection coefficients were investigated due to the formation of the concentration polarised layer on the membrane surface. In addition, flux decline and the fouling index of the membrane were determined under the present experimental conditions. SLS obtained in the reject stream was characterised following UV–VIS and nuclear magnetic resonance spectroscopy. The spectroscopic analysis confirmed the reduction of the lignin and hemicelluloses component of wood sample effectively into SLS during sulphite pulping with a considerable degree of similarity with the control sample. The results could be useful as guidelines for the scale-up of SLS production and simultaneous treatment of sulphite liquor from the paper and pulp industry. GRAPHICAL ABSTRACT
工业聚醚砜膜超滤亚硫酸废液对木质素磺酸钠的Valorization
摘要对实验室用切碎的胡枝子进行亚硫酸盐制浆产生的亚硫酸盐废液进行超滤,以回收木质素磺酸钠(SLS)。将分子量截止值为5kD的市售亲水化聚醚砜平板膜用于实验。观察了进料稀释因子对渗透通量的影响,并研究了由于在膜表面形成浓度极化层而导致的实际溶质截留系数。此外,在现有的实验条件下,测定了膜的通量下降和结垢指数。根据UV–VIS和核磁共振光谱对在废弃物流中获得的SLS进行表征。光谱分析证实,在亚硫酸盐制浆过程中,木材样品的木质素和半纤维素成分有效地还原为SLS,与对照样品具有相当程度的相似性。研究结果可作为扩大SLS生产和同时处理造纸和纸浆工业亚硫酸盐液的指南。图形摘要
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来源期刊
Indian Chemical Engineer
Indian Chemical Engineer ENGINEERING, CHEMICAL-
CiteScore
3.00
自引率
6.70%
发文量
33
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