A model black liquor formulation for use in development and evaluation of membranes for concentrating  weak black liquor, TAPPI Journal February 2022



Application: A recipe for a model black liquor is presented for use in developing and testing robust membranes for concentrating black liquor. The use of a common reference liquor allows developers to directly compare proto-type membrane performance to that of other commercial or prototype membranes.

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Author: Scott Sinquefield
A model black liquor formulation for use in development and
ABSTRACT: As part of a larger program to develop robust membranes for concentrating weak black liquor prior to the evaporation step, several commercially available membranes were tested for suitability in this application. Given the variation in kraft black liquor for various wood species, the mill-to-mill variations, and the challenges of obtaining fresh samples, the need became apparent for a synthetic reference black liquor that would allow any membrane developer to test a new prototype membrane and compare the results with others. We present a formulation for a model black liquor (MBL) similar to real kraft black liquor in the composition of the major species that can be formulated from readily available reagents. The MBL was tested with two commercial membranes and resulted in similar levels of lignin retention as the real black liquor. It also showed similar viscosity behavior to real black liquor as a function of solids content.
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