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- W3147185583 abstract "approved: Murray L. Laver A study of the complexation reaction of two organic compounds known to be present in kraft black liquor with four metal ions (Al, Ca, Fe, Mg) has been carried out by pH measurements. Results indicate that a degraded carbohydrate acid [2-hydroxybutanoic acid (L)] forms complexes with aluminum, ferric, calcium and magnesium ions under acidic conditions ( pH: 2 5 ). The logarithm of the apparent formation constants (log Ki) of complexes under 1.5 M ionic strength for AlLi, AlL2 and AlL3 are 3.03, 2.51 and 1.49 respectively. The log K3 of FeL3 is 2.69. Formation constants of CaL and MgL were not determined from this study. Indulin AT, a lignin material isolated from kraft pulp black liquor, was investigated in complexation reactions. Titration results showed that only calcium and magnesium formed complexes with Indulin AT under basic conditions Signature redacted for privacy. (pH: 9 11). Their average formation constants (logo) under 1.5 M ionic strength are 2.31 for CaL and 2.20 for MgL. The formation of hydroxide complexes of aluminum, and ferric ions were probably much stronger than those with Indulin AT in basic medium. Therefore, no complexes were found under the conditions used in this work. The results suggests that lignin and related materials can form complexes under the conditions of kraft pulp black liquor production, and therefore they may enhance the formation of scale in kraft pulp mills. THE USE OF pH MEASUREMENTS FOR THE DETERMINATION OF FORMATION CONSTANTS OF METAL-ORGANIC COMPLEXES IN KRAFT PULP BLACK LIQUOR" @default.
- W3147185583 created "2021-04-13" @default.
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- W3147185583 date "2010-01-01" @default.
- W3147185583 modified "2023-09-27" @default.
- W3147185583 title "THE USE OF pH MEASUREMENTS FOR THE DETERMINATION OF FORMATION CONSTANTS OF METAL-ORGANIC COMPLEXES IN KRAFT PULP BLACK LIQUOR" @default.
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