Recovery of sodium organic salts from partially wet oxidized black liquor

Karhan Özdenkci*, Jukka Koskinen, Golam Sarwar

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)


Partial wet oxidation is a recently proposed biorefinery concept for black liquor, generating carboxylic acids and their sodium salts. The aim of this study is to investigate the recovery of sodium organic salts and carboxylic acids from partial wet oxidation downstream by using a preliminary thermodynamic model. The paper illustrates the speciation of sodium formate-sodium acetate-water system together with formic and acetic acids in aqueous solution with respect to pH and temperature. The speciation results indicate that salt recovery requires water evaporation and high pH, whereas acid recovery requires low pH. Temperature slightly influences the salt recovery but has no major impact on acid recovery. Hence, the alternatives for the recovery process can be evaporator-crystallizer-pH reduction with acid or evaporative crystallizer-cooling crystallizer-pH reduction with acid addition.

Original languageEnglish
Pages (from-to)825-833
Number of pages9
JournalCellulose Chemistry and Technology
Issue number9-10
Publication statusPublished - 1 Oct 2014
MoE publication typeA1 Journal article-refereed


  • Acid recovery
  • Activity coefficient
  • Aqueous thermodynamics
  • Biorefinery
  • Black liquor
  • Bromley's method
  • Carboxylic acids
  • Crystallization
  • Electrolyte thermodynamics
  • Partial wet oxidation
  • Salt recovery
  • Sodium organic salts
  • Speciation


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