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Using ultrafiltration to analyze the molar mass distribution of kraft lignin at ph 13
Author(s) -
Li J.,
O'Hagan T.,
MacLeod J. M.
Publication year - 1996
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450740114
Subject(s) - lignin , molar mass , ultrafiltration (renal) , kraft paper , gel permeation chromatography , chemistry , membrane , molar mass distribution , chromatography , permeation , polymer , materials science , organic chemistry , composite material , biochemistry
We used deliberately calibrated ultrafiltration membranes to analyze the molar mass distribution (MMD) of kraft lignin in alkaline solution. The membranes were first tested with probe macromolecules to obtain sieving curves at the same conditions as the lignin analysis. Using a restricted transport model, we calculated the average effective membrane pore sizes. The results were different from the nominal cut‐off values. The MMD of a lignin sample at pH 13 was analyzed by separating the lignin solution into five fractions; the MMD using the calibrated cut‐off values was confirmed by gel permeation chromatography.