Kinetics Study for Ion-Exchange-Resin Catalyzed Hydrolysis of Methyl Glycolate

Abstract

The hydrolysis of methyl glycolate catalyzed by commercial cation-exchange resin was studied in a stirred tank batch reactor. It was found that 001×7 resin was an effective catalyst for the hydrolysis of methyl glycolate. The effects of catalyst loading, initial reactant ratio and temperature have been examined in detail. The kinetics of glycolate hydrolysis was evaluated by the use of the pseudohomogeneous model, which was found to represent the kinetics fairly well, due to the total dissociation of the active sulfonic acid group in swollen polymer resin in the presence of water. The kinetics was expressed in terms of activities and the activity coefficients were estimated by using the group contribution method UNIFAC. The activation energy was found to be 59.26 kJ/mol for 001×7 resin, indicating surface reaction is the rate-controlling step.

Kinetics of Transesterification of 1,4‐Butanediol With Methyl Acetate by the Ion‐exchange Resin

“…All remaining experiments are performed with 10% catalyst loading for saving the catalyst. It can be observed from Figure that the initial reaction rate r 0 rises in proportion with increase of catalyst loading, indicating that the surface reaction is the rate‐determining step …”

“…Compared with the processes catalyzed by homogeneous catalysts, the solid ion‐exchange resins have the following inherent advantages. Firstly, the particulate nature of the resin allows mechanical separation of the catalyst from the reaction mixture with lower capital and processing costs . Secondly, it is a green catalyst, and the equipment is not subject to corrosion.…”

“…Firstly, the particulate nature of the resin allows mechanical separation of the catalyst from the reaction mixture with lower capital and processing costs. 7 Secondly, it is a green catalyst, and the equipment is not subject to corrosion. Thirdly, the side reaction can be eliminated and the product purity is high.…”

Kinetics study and process simulation of transesterification of ethylene glycol with methyl acetate for ethylene glycol diacetate

“…Heterogeneous catalysts, especially acid ion‐exchange resins, have been widely used as catalysts for transesterification . Compared to the processes catalyzed by homogeneous catalysts, the granular nature of the resin allows mechanical separation of the catalyst from the reaction system with lower capital and processing costs . Furthermore, the reaction distillation column, packed with resin, shows a huge advantage in promoting reaction and separation …”

“…[11] Compared to the processes catalyzed by homogeneous catalysts, the granular nature of the resin allows mechanical separation of the catalyst from the reaction system with lower capital and processing costs. [12] Furthermore, the reaction distillation column, packed with resin, shows a huge advantage in promoting reaction and separation. [13] The reaction of converting EG into EGDA is a typical reversible, consecutive reaction with ethylene glycol monoacetate (EGMA) as an intermediate, the yield of EGDA is limited by the chemical equilibrium.…”