Reaction and Spectroscopic Studies of Sodium Salt Catalysts for Lactic Acid Conversion

Man S. Tam, Garry C. Gunter, Radu Craciun, Dennis J. Miller, James E. Jackson

Research output: Contribution to journalArticle

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Abstract

Catalytic conversion of lactic acid to 2,3-pentanedione over sodium salts and base on low surface area silica support has been studied. Yield and selectivity toward 2,3-pentanedione are optimal at around 300°C, 3-4 s residence time, and 0.5 MPa total pressure. Anions of initial salt catalysts used do not participate in lactic acid condensation to 2,3-pentanedione once steady-state conditions have been achieved; instead, sodium lactate has been identified by postreaction FTIR spectroscopy as the primary, stable species on the support during reaction. Sodium lactate is believed to be an intermediate in 2,3-pentanedione formation. Conversion of a sodium salt to sodium lactate is greatest when the salt used has a low melting point and a volatile conjugate acid; the extent of conversion depends weakly on reaction time and temperature within experimental conditions. At high temperature (∼350°C), sodium lactate decomposes to sodium propanoate and sodium acetate, which may explain reduced 2,3-pentanedione yields at higher temperatures.

LanguageEnglish (US)
Pages3505-3512
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume36
Issue number9
StatePublished - Sep 1997

Profile

Sodium Lactate
Lactic acid
Lactic Acid
Salts
Sodium
catalyst
sodium
salt
Catalysts
acid
Sodium Acetate
Propionates
Silicon Dioxide
Temperature
Anions
Melting point
Condensation
2,3-pentanedione
Spectroscopy
FTIR spectroscopy

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics

Cite this

Reaction and Spectroscopic Studies of Sodium Salt Catalysts for Lactic Acid Conversion. / Tam, Man S.; Gunter, Garry C.; Craciun, Radu; Miller, Dennis J.; Jackson, James E.

In: Industrial and Engineering Chemistry Research, Vol. 36, No. 9, 09.1997, p. 3505-3512.

Research output: Contribution to journalArticle

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