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Acetic Acid Removal from Pre-Pulping Wood Extract with Recovery and Recycling of Extraction Solvents.

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  • معلومة اضافية
    • المصدر:
      Publisher: Humana Press Country of Publication: United States NLM ID: 8208561 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1559-0291 (Electronic) Linking ISSN: 02732289 NLM ISO Abbreviation: Appl Biochem Biotechnol Subsets: MEDLINE
    • بيانات النشر:
      Original Publication: Clifton, N.J. : Humana Press, c1981-
    • الموضوع:
      Recycling*; Acetic Acid/*isolation & purification ; Alkanes/*chemistry ; Octanols/*chemistry ; Polysaccharides/*isolation & purification ; Solvents/*chemistry ; Wood/*chemistry; Amines/chemistry ; Centrifugation ; Fermentation ; Hot Temperature ; Hydrogen-Ion Concentration ; Organophosphorus Compounds/chemistry ; Solutions ; Water
    • نبذة مختصرة :
      Pre-pulping extraction is a means of deriving a hemicellulose-rich process stream from the front end of a kraft pulp mill. When the extraction is carried out using green liquor, pulp quality and quantity can be retained while still releasing hemicelluloses and acetic acid (HAc) for recovery as bioprocessing feedstock or chemical products. The HAc that is present in the wood extraction is inhibitory to microorganisms and can hinder fermentation. HAc is also a commodity chemical that may provide sufficient value to justify recovery and purification. In this study, a liquid-liquid extraction (LLE) method is applied to extract HAc from a green liquor pre-pulping hardwood extract (GLE). The HAc removal is carried out after acid hydrolysis and prior to fermentation. Two organic solutions: trioctylphosphine oxide (TOPO) diluted in undecane and trioctylamine (TOA) diluted in octanol were tested for their abilities to extract HAc from GLE and to be recycled back through the process. GLE was contacted with the organic solvents, phase separated by centrifugation, and the organic phase was then distilled to recover the acetic acid. The solvent was then recycled back for a subsequent extraction of fresh GLE. It was found that TOA was a superior extractant, but failed to easily release its HAc through distillation. It also quickly became contaminated with other compounds in the wood extracts and lost its extraction efficiency after only a few recycles. The TOPO solvent did release its HAc through distillation but also lost extraction capacity with recycling. Back extraction of the TOPO solvent with sodium hydroxide solution restored the performance of the TOPO solvent.
    • Grant Information:
      DE-FG36-08GO18165 USDoE
    • Contributed Indexing:
      Keywords: Acetic acid; Kraft pulping; Liquid–liquid extraction; Pre-pulping extraction; Solvent recycle; Trioctylamine; Trioctylphosphine oxide
    • الرقم المعرف:
      0 (Alkanes)
      0 (Amines)
      0 (Octanols)
      0 (Organophosphorus Compounds)
      0 (Polysaccharides)
      0 (Solutions)
      0 (Solvents)
      059QF0KO0R (Water)
      78-50-2 (trioctyl phosphine oxide)
      8024-50-8 (hemicellulose)
      I40965UY86 (tri-N-octylamine)
      JV0QT00NUE (undecane)
      Q40Q9N063P (Acetic Acid)
    • الموضوع:
      Date Created: 20180703 Date Completed: 20190403 Latest Revision: 20220408
    • الموضوع:
      20250114
    • الرقم المعرف:
      10.1007/s12010-018-2826-z
    • الرقم المعرف:
      29961903