rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Recovery of carboxylic acids from fermentation broth via acid springing
  name:
    name part: Dong, Jipeng.
    role:
      role term: creator
  name:
    name part: Holtzapple, Mark T.
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2010
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: electronic
    form: remote
    extent: 1 online resource.
  abstract: A proprietary technology owned by Texas A&M University, named the MixAlco Process, can process biodegradable wastes (e.g., paper fines, municipal solid waste, sewage sludge, and industrial biosludge) to obtain carboxylic acids and mixed alcohol fuels as downstream products. The process uses a mixed culture of naturally occurring microorganisms, found in natural habitats such as the rumen of cattle and marine and terrestrial swamps, to convert biomass wastes into a mixture of carboxylic acids. As the microorganisms digest the biomass and convert it into a mixture of carboxylic acids, the pH must be controlled. This is done by adding a buffering agent (e.g., calcium carbonate), thus a mixture of carboxylate salts is produced. Carboxylic acids can be recovered from the carboxylate salts directly through a process known as 'acid springing.' This process mixes carboxylate salts (e.g., Ca(Ac)2) with carbon dioxide (CO2) and a low-molecular-weight tertiary amine (R3N) to precipitate calcium carbonate (CaCO3). The low-molecular-weight tertiary amine carboxylate (R3NHAc) remains in the liquid. Then, this liquid is mixed with tri-nivoctylamine (R3N) and distilled. During distillation, tertiary amine carboxylate can be thermally decomposed into the amine itself, which is recycled, and carboxylic acids. Theoretically, no chemicals are consumed or wastes produced during this process. Essentially, the 'acid springing' process consists of precipitation and thermal conversion. The research described in this thesis focuses on choosing a proper lowmolecular-weight tertiary amine suitable for the process and determining the optimal temperature for thermal conversion. Because the fermentation broth mainly contains calcium acetate (more than 80% by weight), an aqueous solution of reagent-grade calcium acetate is used for research purposes instead of fermentation broth. Then, the actual fermentation broth is used to verify the conclusions. A 0.3-L pressure vessel reactor was designed and…
  note: by Jipeng Dong.
  note: "Major Subject: Chemical Engineering"
  note: Title from author supplied metadata (automated record created 2010-03-12 12:08:51).
  note: Electronic resource.
  note: Master of Science Texas A&M University 2008 http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-153
  note: Includes bibliographical references.
  note: Text (Thesis)
  subject:
    topic: Major chemical engineering
  subject:
    topic: tertiary amine
  subject:
    topic: fermentation broth
  subject:
    topic: carboxylic acids
  subject:
    topic: biomass
  subject:
    topic: carboxylate salts
  identifier: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-153
  record info:
    record content source: TXA
    record creation date: 100426
    record change date: 20151201120058.0
    record identifier: in00002595123