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Isomerization of d-glucose by disodium pentasilicate (Na2Si5O11.xCH3OH.yH2O) in methanol-water solutions

1985; Elsevier BV; Volume: 137; Linguagem: Inglês

10.1016/0008-6215(85)85152-1

1873-426X

Hisatoshi Asaoka,

Chemical Synthesis and Characterization

Abstract Disodium pentasilicate (Na 2 Si 5 O 11 . x CH 3 OH. y H 2 O, DPS), prepared from sodium metasilicate, was found effective for the isomerization of d -glucose in methanol-water. The isomerization was accelerated markedly as a function of methanol concentration; in 80% (v/v) methanol, the production of d -fructose was 1.7 times that in water alone. A 67.7% conversion of d -glucose into d -fructose was achieved by a batch reaction operated for 18 h at 40°. The disappearance of d -glucose in the isomerization reaction follows second-order kinetics, and the activation energy of the forward reaction is 129 kJ.mol −1 .