Polyethylene glycol-supported ionic liquid as a highly efficient catalyst for the synthesis of propylene carbonate under mild conditions

doi:10.1007/s11705-012-1297-y

Front Chem Sci Eng

2012, Vol. 6

Issue (3) : 239-245 https://doi.org/10.1007/s11705-012-1297-y

RESEARCH ARTICLE

Polyethylene glycol-supported ionic liquid as a highly efficient catalyst for the synthesis of propylene carbonate under mild conditions

Rui YAO, Hua WANG, Jinyu HAN(

)

Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China

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Abstract

The coupling reaction of propylene and CO₂ to form propylene carbonate (PC) was promoted by an ionic liquid (IL) covalently bound to polyethylene glycol (PEG). The supported ionic liquid, which has both acidic and basic components, proved to be an active catalyst for PC synthesis under mild conditions. The effects of different cations and anions, reaction temperature, CO₂ pressure, and reaction time were investigated. It was demonstrated that the acid group in the catalyst plays an important role in the reaction. With this system, a high PC yield (95%) was achieved under mild conditions (3.0 MPa, 120°C and 4 h) without a co-solvent. In addition, the catalyst was readily recovered and reused. Based on the experimental results, a plausible mechanism for the catalyst was proposed.

Keywords ionic liquid PEG-supported ionic liquid carbon dioxide propylene carbonate

Corresponding Author(s): HAN Jinyu,Email:hanjinyu@tju.edu.cn

Issue Date: 05 September 2012

Cite this article:

Hua WANG,Jinyu HAN,Rui YAO. Polyethylene glycol-supported ionic liquid as a highly efficient catalyst for the synthesis of propylene carbonate under mild conditions[J]. Front Chem Sci Eng, 2012, 6(3): 239-245.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-012-1297-y
https://academic.hep.com.cn/fcse/EN/Y2012/V6/I3/239

Fig.1 Synthesis of propylene carbonate from propylene oxide and CO

Fig.2 Synthesis process of PEG-supported ionic liquids (PEG-MIM-HSO)

Fig.3 FTIR spectra of (a)PEG-MIM-HSO, (b) PEG-MIM-HPO and(c)PEG-MIM-HCO

Tab.1 Effect of different catalysts on the synthesis of PC

Fig.4 The yield of PC at different reaction temperatures. Reaction conditions: propylene oxide, 17.2 mmol; ionic liquid, 6 mmol%; pressure, 3.0 MPa; time, 4 h

Fig.5 The yield of PC at different reaction pressures. Reaction conditions: propylene oxide, 17.2 mmol; ionic liquid, 6 mmol%; temperature, 120°C; time, 4 h

Fig.6 Yield of PC as a function of reaction time. Reaction conditions: propylene oxide, 17.2 mmol; ionic liquid, 6 mmol%; pressure, 3.0 MPa; temperature, 120°C

Fig.7 Catalytic activity of recycled PEG-MIM-HSO. Reaction conditions: propylene oxide, 17.2 mmol; ionic liquid, 6 mmol%; pressure, 3.0 MPa; temperature, 120°C, time, 4 h

Fig.8 Proposed mechanism for the reaction

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