Aqueous-phase hydrogenation of lactic acid to propylene glycol

Research output: Contribution to journalArticle

  • 76 Citations

Abstract

The metal-catalyzed hydrogenation of lactic acid to propylene glycol (PG) in aqueous solution is investigated in a laboratory-scale stirred batch reactor. Ruthenium on activated carbon is identified as an active catalyst for the reaction, with nearly complete conversion achieved at reaction temperatures of 100-170°C and hydrogen pressures of 7-14MPa. Selectivity to PG in excess of 90% at 95% lactic acid conversion has been obtained at optimal reaction conditions. Potassium and calcium lactate salts cannot be directly converted to PG, but simple addition of sulfuric acid suffices to convert the salt to free acid, which is then hydrogenated. The ready availability of low-cost lactic acid, produced via fermentation of corn-derived carbohydrates, makes this biomass-based route an attractive alternative to the traditional petroleum-based pathways to PG.

LanguageEnglish (US)
Pages89-98
Number of pages10
JournalApplied Catalysis A: General
Volume219
Issue number1-2
DOIs
StatePublished - Oct 5 2001

Profile

Propylene Glycol
Lactic acid
Glycols
Hydrogenation
Propylene
Lactic Acid
Salts
Ruthenium
Petroleum
Batch reactors
Carbohydrates
Sulfuric acid
Activated carbon
Fermentation
Potassium
Hydrogen
Calcium
Biomass
Crude oil
Metals

Keywords

  • Hydrogenation
  • Lactic acid
  • Propylene glycol
  • Ruthenium

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Aqueous-phase hydrogenation of lactic acid to propylene glycol. / Zhang, Zhigang; Jackson, James E.; Miller, Dennis J.

In: Applied Catalysis A: General, Vol. 219, No. 1-2, 05.10.2001, p. 89-98.

Research output: Contribution to journalArticle

@article{128ad8802df043d39ad3f4e6e7247a4c,
title = "Aqueous-phase hydrogenation of lactic acid to propylene glycol",
abstract = "The metal-catalyzed hydrogenation of lactic acid to propylene glycol (PG) in aqueous solution is investigated in a laboratory-scale stirred batch reactor. Ruthenium on activated carbon is identified as an active catalyst for the reaction, with nearly complete conversion achieved at reaction temperatures of 100-170°C and hydrogen pressures of 7-14MPa. Selectivity to PG in excess of 90{\%} at 95{\%} lactic acid conversion has been obtained at optimal reaction conditions. Potassium and calcium lactate salts cannot be directly converted to PG, but simple addition of sulfuric acid suffices to convert the salt to free acid, which is then hydrogenated. The ready availability of low-cost lactic acid, produced via fermentation of corn-derived carbohydrates, makes this biomass-based route an attractive alternative to the traditional petroleum-based pathways to PG.",
keywords = "Hydrogenation, Lactic acid, Propylene glycol, Ruthenium",
author = "Zhigang Zhang and Jackson, {James E.} and Miller, {Dennis J.}",
year = "2001",
month = "10",
day = "5",
doi = "10.1016/S0926-860X(01)00669-X",
language = "English (US)",
volume = "219",
pages = "89--98",
journal = "Applied Catalysis A: General",
issn = "0926-860X",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Aqueous-phase hydrogenation of lactic acid to propylene glycol

AU - Zhang,Zhigang

AU - Jackson,James E.

AU - Miller,Dennis J.

PY - 2001/10/5

Y1 - 2001/10/5

N2 - The metal-catalyzed hydrogenation of lactic acid to propylene glycol (PG) in aqueous solution is investigated in a laboratory-scale stirred batch reactor. Ruthenium on activated carbon is identified as an active catalyst for the reaction, with nearly complete conversion achieved at reaction temperatures of 100-170°C and hydrogen pressures of 7-14MPa. Selectivity to PG in excess of 90% at 95% lactic acid conversion has been obtained at optimal reaction conditions. Potassium and calcium lactate salts cannot be directly converted to PG, but simple addition of sulfuric acid suffices to convert the salt to free acid, which is then hydrogenated. The ready availability of low-cost lactic acid, produced via fermentation of corn-derived carbohydrates, makes this biomass-based route an attractive alternative to the traditional petroleum-based pathways to PG.

AB - The metal-catalyzed hydrogenation of lactic acid to propylene glycol (PG) in aqueous solution is investigated in a laboratory-scale stirred batch reactor. Ruthenium on activated carbon is identified as an active catalyst for the reaction, with nearly complete conversion achieved at reaction temperatures of 100-170°C and hydrogen pressures of 7-14MPa. Selectivity to PG in excess of 90% at 95% lactic acid conversion has been obtained at optimal reaction conditions. Potassium and calcium lactate salts cannot be directly converted to PG, but simple addition of sulfuric acid suffices to convert the salt to free acid, which is then hydrogenated. The ready availability of low-cost lactic acid, produced via fermentation of corn-derived carbohydrates, makes this biomass-based route an attractive alternative to the traditional petroleum-based pathways to PG.

KW - Hydrogenation

KW - Lactic acid

KW - Propylene glycol

KW - Ruthenium

UR - http://www.scopus.com/inward/record.url?scp=0035812986&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035812986&partnerID=8YFLogxK

U2 - 10.1016/S0926-860X(01)00669-X

DO - 10.1016/S0926-860X(01)00669-X

M3 - Article

VL - 219

SP - 89

EP - 98

JO - Applied Catalysis A: General

T2 - Applied Catalysis A: General

JF - Applied Catalysis A: General

SN - 0926-860X

IS - 1-2

ER -