Fractionation of organic and inorganic compounds from black liquor by combining membrane separation and crystallization

H. Niemi*, Jussi Lahti, H. Hatakka, S. Kärki, S. Rovio, M. Kallioinen, M. Mänttäri, M. Louhi-Kultanen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)

Abstract

Separation of organic and inorganic compounds from black liquor was investigated. Black liquor from the pulp and paper industry contains hundreds of different compounds and several high-value organic chemicals are formed during alkaline pulping. These organic compounds can be used in the fine chemicals, pharmaceutical and food industries. The main aim of this study was to recover and purify high value-added organic compounds (organic acids) from lignin and inorganic compounds by combining membrane filtration, acid precipitation and cooling crystallization. The effect of membrane filtration on the efficiency of precipitation and crystallization was also studied. A number of separation methods were studied under a variety of operating conditions. The results showed that a combination of membrane separation and crystallization is an efficient method for recovering and purifying valuable organic compounds in black liquor. The amount of major impurities in black liquor could be reduced significantly. Separation of organic and inorganic compounds from black liquor of alkaline digesting of wood by combining membrane filtration and crystallization was studied. The combination of membrane filtration and crystallization is an efficient method to recover and purify high value-added organic compounds (organic acids) from lignin and inorganic compounds.

Original languageEnglish
Pages (from-to)593-598
Number of pages6
JournalChemical Engineering and Technology
Volume34
Issue number4
DOIs
Publication statusPublished - Apr 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • Black liquor
  • Crystallization
  • Membrane processes
  • Organic acids
  • Separation

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