TY - JOUR
T1 - Dehydration of lactic acid to acrylic acid in high temperature water at high pressures
AU - Aida, Taku Michael
AU - Ikarashi, Akira
AU - Saito, Yuki
AU - Watanabe, Masaru
AU - Smith, Richard Lee
AU - Arai, Kunio
N1 - Funding Information:
Dr. Xinhua Qi from Nankai University, China is gratefully acknowledged for his constructive comments during the preparation of this manuscript. The authors gratefully acknowledge financial support from the Japan Society for the Promotion of Science with Grant-in-Aid for Scientific Research (B) 18360379.
PY - 2009/10
Y1 - 2009/10
N2 - Reaction of lactic acid was investigated with a flow apparatus in water at high temperatures (450 °C) and high pressures (40-100 MPa). The major products obtained from the reaction of lactic acid were acrylic acid, acetaldehyde, and the minor products were acetic acid and propionic acid. The maximum selectivity of acrylic acid was 44% at 23% lactic acid conversion that was obtained at 450 °C, 100 MPa and a residence time of 0.8 s. The reaction kinetics could be modeled by considering two pathways defined as a dehydration pathway to acrylic acid and a combined reaction pathway that consisted of decarboxylation and decarbonylation to acetaldehyde. The data and the kinetic analysis consistently show that both dehydration and the combined decarboxylation and decarbonylation reactions continue to be promoted in supercritical water as pressure (water density) increases. However, high water densities increase the selectivity of the dehydration reaction.
AB - Reaction of lactic acid was investigated with a flow apparatus in water at high temperatures (450 °C) and high pressures (40-100 MPa). The major products obtained from the reaction of lactic acid were acrylic acid, acetaldehyde, and the minor products were acetic acid and propionic acid. The maximum selectivity of acrylic acid was 44% at 23% lactic acid conversion that was obtained at 450 °C, 100 MPa and a residence time of 0.8 s. The reaction kinetics could be modeled by considering two pathways defined as a dehydration pathway to acrylic acid and a combined reaction pathway that consisted of decarboxylation and decarbonylation to acetaldehyde. The data and the kinetic analysis consistently show that both dehydration and the combined decarboxylation and decarbonylation reactions continue to be promoted in supercritical water as pressure (water density) increases. However, high water densities increase the selectivity of the dehydration reaction.
KW - Acrylic acid
KW - High temperature water
KW - Lactic acid
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U2 - 10.1016/j.supflu.2009.06.006
DO - 10.1016/j.supflu.2009.06.006
M3 - Article
AN - SCOPUS:67749120010
SN - 0896-8446
VL - 50
SP - 257
EP - 264
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
IS - 3
ER -