Recovery of vanillin from lignin/vanillin mixture by using tubular ceramic ultrafiltration membranes

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Zabkova, M (Author) Other; da Silva, EAB (Author) Other; Alírio Rodrigues (Author) FEUP

Journal

Title: Journal of Membrane Science

Vol. 301

Pages: 221-237

ISSN: 0376-7388

Publisher: Elsevier

Indexing

ISI Proceedings

ISI Web of Knowledge - 30 Citations

Scopus - 25 Citations

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-004-7XZ

DOI: 10.1016/j-memsci.2007.06.025

Resumo (PT): KRAFT BLACK LIQUOR; CROSS-FLOW ULTRAFILTRATION; FLUX DECLINE ANALYSIS; CONCENTRATION POLARIZATION; STRUCTURAL-CHANGES; COLLOIDAL BEHAVIOR; AQUEOUS-SOLUTIONS; TRANSPORT MODEL; WATER-TREATMENT; LIMITING FLUX

Abstract (EN): The aim of this work is to evaluate the membrane ultrafiltration process for the recovery of vanillin from Kraft lignin oxidation media. Tubular ceramic membranes with molecular weight (M,,) cut-off of 1, 5 and 15 kDa are investigated. The influence of lignin and vanillin concentration and pH of the mixture on the performance of ultrafiltration is studied in batch mode. Permeate flux, lignin and vanillin content in retentate and permeate streams were measured. A theoretical model is used to calculate the variation of the concentration profile within the polarization concentration layer and to estimate the membrane surface concentration during the ultrafiltration operation. The values obtained for the lignin concentration at membrane surface suggests that there is a growth of a gel layer in the ceramic membranes of higher M, cut-off for the operating conditions used. By filtrating the lignin/vanillin mixture at the concentration 60/6 g L-1 and pH 12.5 using I kDa cut-off membrane, the observed rejection of lignin was 0.972. On the other hand, using the membranes with small cut-off leads to significant decline of permeate flux compared with the membranes with larger cut-off. It was observed that very high cleaning efficiency can be obtained using sodium hydroxide solution.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17