Reversible reaction-assisted intensification process for separating ethanediol and 1, 2-butanediol: Competitive kinetics study and conceptual design

Application of Dimethyl Carbonate Assisted Chemical Looping Technology in the Separation of the Ethylene Glycol and 1,2-Butanediol Mixture and Coproduction of 1,2-Butene Carbonate

“…The absence of external mass-transfer resistance was ensured by a stirring speed sufficient enough to accomplish the complete catalyst suspension and pseudo-homogeneous solution. ,, A variety of stirring speeds (from 300 to 900 rpm) were tested for the reactions of EG-DMC and 1,2-BDO-DMC. As shown in Figure a, the external mass-transfer resistance could be eliminated when the stirring speed was over 600 rpm for the EG-DMC system.…”

“…In addition, the yield of EG is limited as it is distilled out along with the removal of 1,2-BDO . Thus, physical methods cannot achieve a clear separation of the 1,2-BDO and EG mixture, increase the yield of the EG product, and obtain the 1,2-BDO product. ,, …”

“…A chemical method proposed by Ai et al investigated the removal of 1,2-PDO and 1,2-BDO via selective catalytic hydration in the presence of H-Beta 26. However, the reaction network of this hydration process was complicated, and its feasibility to obtain a qualified EG product has not been verified yet. , Li et al proposed an aldehyde-assisted chemical looping technology in the separation of the EG and 1,2-BDO mixture via reactive distillation, which showed excellent economic advantages. − This inspired us to explore the possibility of achieving the separation of EG and 1,2-BDO as well as coproducing the high-value-added 1,2-BC by employing a suitable reactant agent in the reversible transesterification-assisted chemical looping separation technology.…”

“…42 Thus, physical methods cannot achieve a clear separation of the 1,2-BDO and EG mixture, increase the yield of the EG product, and obtain the 1,2-BDO product. 36,40,43 A chemical method proposed by Ai et al investigated the removal of 1,2-PDO and 1,2-BDO via selective catalytic hydration in the presence of H-Beta 26. However, the reaction network of this hydration process was complicated, and its feasibility to obtain a qualified EG product has not been verified yet.…”

The transesterification of ethylene glycol and 1,2-butanediol with dimethyl carbonate: reaction network and kinetic modeling

“…33 At present, transesterification reactions involving cyclic carbonates, MeOH or ethanol-forming diols, and DMC have already been broadly investigated in the literature, however, the reaction kinetics and chemical equilibrium of diols reacting with DMC to produce cyclic carbonates have not yet been fully explored. [35][36][37][38][39] However, the chemical equilibrium constants of transesterification reactions are known to be low. Removing one product from the reaction in situ is one way to overcome chemical equilibrium limitations.…”