Open AccessDecomposition Kinetics of Maltose in Subcritical Water
Author(s) -
Shabnam Haghighat Khajavi,
Yukitaka Kimura,
Toshinobu Oomori,
Ryuichi Matsuno,
Shuji Adachi
Publication year - 2004
Publication title -
bioscience biotechnology and biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.509
H-Index - 116
eISSN - 1347-6947
pISSN - 0916-8451
DOI - 10.1271/bbb.68.91
Subject(s) - maltose , decomposition , kinetics , chemistry , reaction rate constant , hydroxymethyl , chemical process of decomposition , residence time (fluid dynamics) , effluent , batch reactor , chemical decomposition , inorganic chemistry , chromatography , organic chemistry , environmental engineering , catalysis , physics , geotechnical engineering , enzyme , quantum mechanics , engineering
The decomposition process of maltose in subcritical water was studied using a tubular reactor in the temperature range of 180 to 260 degrees C and at 10 MPa. The formation of glucose and 5-hydroxymethyl-2-furaldehyde during the maltose decomposition was also observed. The decomposition rate of maltose was faster at higher temperatures. The rate was approximated by first-order kinetics during the early stage of the decomposition, but was accelerated and deviated from these kinetics at the later stage. The effluent pH decreased as the residence time in the reactor increased and the decrease of pH affected the maltose decomposition rate and glucose formation. Low pH of a feed solution accelerated maltose decomposition. A good correlation was obtained between the pH of the effluent and the rate constant of the first-order kinetics.
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