Downstream processing of an oxidized industrial kraft liquor by membrane fractionation for vanillin and syringaldehyde recovery

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Inês Ferreira Mota (Author) FEUP; Paula Rodrigues Pinto (Author) Other; Ana Mafalda Ribeiro (Author) FEUP; José Miguel Loureiro (Author) FEUP; Alírio Egídio Rodrigues (Author) FEUP

Journal

Title: Separation and Purification Technology

Vol. 197

Pages: 360-371

ISSN: 1383-5866

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 8 Citations

INSPEC

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering

FOS: Engineering and technology > Chemical engineering

Associated Projects

LSRE-LCM - Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais

AIProcMat@N2020 - Advanced Industrial Processes and Materials for a Sustainable North Region of Portugal2020

Other information

Authenticus ID: P-00N-K4Z

DOI: 10.1016/j.seppur.2018.01.001

Abstract (EN): A membrane fractionation study of an oxidized industrial kraft liquor was performed with 50, 5 and 1 kDa molecular weight cut-off membranes to study the productivity of each membrane and the respective apparent rejection coefficients (R-i) to total solids (TS), ashes and low molecular weight phenolates (TP). Cleaning efficiency of each membrane was evaluated and the contribution of fouling for flux decline was analyzed by applying the resistances-in-series approach. During membrane fractionation sequence, TS content in the permeate stream gradually decreased from 86.5 g L-1 to 75.3 g L-1 (50 kDa), 64 g L-1 (5 kDa) and 58.6 g L-1 (1 kDa). The R-i values observed for TS were 25.3%, 29.1% and 15.1% for 50, 5 and 1 kDa membrane processing, respectively. TP were not retained by the 50 kDa membrane while, for the 5 and 1 kDa membranes, R-i of 11.5% and 9.0% were observed, respectively. The initial TP concentration (2.4 g L-1) was maintained in the first membrane stage, while for the other stages decreased slightly for 2.22 g L-1 (5 kDa) and 2.15 g L-1 (1 kDa). Nevertheless, in terms of composition (%w/w(Ts)), an enrichment in TP was observed in all three stages from 2.8% (feed) to 3.2% (50 kDa), 3.5% (5 kDa) and 3.7% (1 kDa). The initial water fluxes were recovered within 2-3 cycles of chemical cleaning and fouling evaluation indicated that reversible fouling was very relevant component for the 50 and 1 kDa membrane processing while irreversible fouling component was more pronounced for the 5 kDa membrane processing.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12