Catalytic Conversion of Glucose to Levulinate Ester Derivative in Ethylene Glycol

Catalytic Conversion of Glucose to Levulinate Ester Derivative in Ethylene Glycol

Blog Article

A comprehensive, kinetic experiment on the conversion of glucose to 2-hydroxyethyl levulinate ethylene ketal (HLEK), in a cascade of reactions in ethylene glycol, here catalyzed by low-concentration sulfuric acid, was conducted.The ethylene glycol/sulfuric acid system was found to be tolerant of a high glucose concentration, and no solid humins were created.At a high initial glucose concentration (30 wt %), an HLEK yield of 27.6% was achieved at a moderate temperature (433 K) after a 330-min reaction with dilute sulfuric acid (0.

15 mol/L).In ethylene glycol, more than half of the initial glucose was converted into glucosides within 5 min, and a dynamic equilibrium between these species was achieved; thus, it is reasonable to assume that the ratio of glucosides to glucose was constant (1.35:1) during the entire reaction process.The production of HLEK from glucose via glucosides as a function of the process variables was well-represented by a simplified first-order kinetic abc material model, and the rate expressions were applied to determine the optimum conditions for batch processing.