Large particle spherical poly-ionic liquid–solid base catalyst for high-efficiency transesterification of ethylene carbonate to prepare dimethyl carbonate

et al. 2023

React. Chem. Eng.

Section: Resultsmentioning

confidence: 99%

One-step embedding method for immobilized bifunctional and alkaline ionic liquids as effective catalysts applied in transesterification

Zhao

et al. 2023

React. Chem. Eng.

“…However, the carrier must have a hydroxyl group on its surface, which limits its selection. Free radical polymerization is a kind of polyionic liquid prepared by polymerizing an ionic liquid monomer with an alkenyl group (or alkenyl group with a different functional structure) under the action of an initiator. , This method can control the physical parameters (such as specific surface area and pore size) of the polyionic liquid according to the different polymerization methods and the amount of cross-linking agents. Although free radical polymerization is highly designable, the addition of an initiator, cross-linking agent, and other components in the polymerization process will reduce the proportion of active substances in the finished catalyst.…”

Section: Introductionmentioning

confidence: 99%

An Efficient and Super Stable Immobilized Ionic Liquid Catalyst Application in the Catalytic Synthesis of Carbonates

Gao

Zhao

et al. 2023

Ind. Eng. Chem. Res.

Homogeneous catalysts suffer from difficulty in product separation and recycling. To solve these problems, a strong basicity immobilized ionic liquid catalyst (PS-IMC4IM) was constructed. Various characterizations were applied to identify the differences in the structure and active components of the catalyst during the preparation process and with the spent catalyst. The results indicated that a bis-imidazole ionic liquid (IMC4IM) was successfully immobilized on the polystyrene resin (PS) by covalent bonding. The basic amount of PS-IMC4IM was 0.84 mmol/g, and its basic strength was 9.8 < H_ < 12.8. Its structure and the number of active components remained unchanged after 2000 h of reaction. PS-IMC4IM displayed an admirable catalytic performance in the transesterification of ethylene carbonate (EC) and methanol (MeOH) to synthesize dimethyl carbonate (DMC) at a mild reaction condition. The EC conversion was 76.9%, and the turnover frequency (TOF) was 12.5 h–1 in a fixed-bed reactor. What is more, the TOF value was raised to 76.7 h–1 in the slurry phase reactor. Compared with other reported catalysts, PS-IMC4IM exhibited excellent catalytic ability and stability. Besides, PS-IMC4IM has the capability to synthesize a series of carbonates via transesterification, including diethyl carbonate (DEC), methyl ethyl carbonate (EMC), and glycerol carbonate (GLC). PS-IMC4IM provides a new method to develop highly efficient and stable heterogeneous catalysts for transesterification reactions.

“…4,5 DMC is an electrolyte for Li-ion batteries because of its high dielectric constant. [5][6][7][8][9] Therefore, the synthesis of DMC and its applications have attracted more and more attention from researchers. There are various synthetic methods for DMC, including methanol oxidative carbonylation, methyl nitrite carbonylation, and trans-esterication.…”

Section: Introductionmentioning

confidence: 99%

Homogeneous base catalyst with high activity and stability for synthesis of dimethyl carbonate by transesterification

Bao

et al. 2023

RSC Adv.