Isomerisation of c4-c6 aldoses with zeolites

Anders Riisager (Inventor), Saravanamurugan Shunmugavel (Inventor)

Research output: Patent


The present invention relates to isomerization of C4-C6 aldoses to their corresponding C4-C6 ketoses. In particular, the invention concerns isomerization of C4-C6 aldoses over solid zeolite catalysts free of any metals other than aluminum, in the presence of suitable solvent(s) at suitable elevated temperatures. C6 and C5 aldose sugars such as glucose and xylose, which are available in large amounts from biomass precursors, are isomerized to fructose and xylulose respectively, in a one or two-step process over inexpensive commercially available zeolite catalysts, containing aluminum as the only metal in the catalyst. The ketoses obtained are used as sweeteners in the food and/or brewery industry, or treated to obtain downstream platform chemicals such as lactic acid, HMF, levulinic acid, furfural, MMHB, and the like.
Original languageEnglish
Patent numberWO2014033311
Filing date06/03/2014
Country/TerritoryInternational Bureau of the World Intellectual Property Organization (WIPO)
Priority date21/12/2012
Priority numberEP20120199009
Publication statusPublished - 2014


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