Reusable and efficient polystyrene-supported acidic ionic liquid catalyst for esterifications

Study on the esterification for ethylene glycol diacetate using supported ionic liquids as catalyst: Catalysts preparation, characterization, and reaction kinetics, process

“…4(c). The difference between these two figures is that, however, a typical peak at 1264 cm -1 for stretching frequency of the functional group -CH 2 Cl disappeared in the spectrum of [MR-Ps-im]HSO 4 [32]. All of the above show that the ionic liquid [Ps-mim]HSO 4 has been immobilized on the three supports through covalent bond successfully.…”

Uniform acid poly ionic liquid-based large particle and its catalytic application in esterification reaction

“…The characteristic peaks 1185 cm -1 and 1620 cm -1 was attributed to symmetric stretching vibrations of the SO 3 H group and C=N stretching vibrations of the pyridine ring, respectively [39]. The peaks that appeared at 1730cm -1 was attributed to the C=O stretching vibrations of EGDMA [40] . FT-IR spectrum confirmed that IL-A , St and EGDMA were copolymerized successfully, and acid group CF 3 SO 3 was retained.…”

“…In 2004, Kim and Chi [24] developed polystyrene (PS)-supported IL catalysts for a series of nucleophilic substitution reactions. Afterwards, many researcher investigated PS-supported ILs and examined their catalytic activities in different reactions [25][26][27][28], All the reported PS-supported ILs catalysts mentioned above could catalyze the organic reactions efficiently, and give high yield, high selectivity and good reusability.…”

The synthesis of polysubstituted pyridines using nano Fe3O4 supported hydrogensulfate ionic liquid

“…However, when the reaction conducted in the presence of imidazolium hydrogensulfate ([Hmim]HSO 4 ) and methyl imidazolium hydrogen chloride ([Hmim]Cl) as two non-supported ILs the desired product was obtained in 40 and 30 % yields, respectively (Table 1, entries 4, 5). (Table 1, entries [6][7][8]. This could be because of insolubility of the reactants in H 2 O and the low boiling points of MeOH and EtOH.…”

“…Moreover, use of relatively large amounts of ionic liquids, and their homogeneity, cause environmental problems [4][5][6]. These problems and the priority of the chemical industry to use heterogeneous catalysts has resulted in immobilization of ILs on to solid supports [7][8][9]. Among methods reported for preparation of supported ionic liquids, in recent years magnetic nanoparticles (MNPs) have recently appeared as a new type of catalyst support, because of their high stability and facile separation [10,11].…”