Syntheses of novel halogen-free Brønsted–Lewis acidic ionic liquid catalysts and their applications for synthesis of methyl caprylate

Abstract

Eco-friendly [HSO3-pmim]+(1/2Zn2+)SO42− ionic liquid catalysts facilitates synergistic Brønsted and Lewis acidity for esterification of n-caprylic acid to methyl caprylate.

Novel Keggin-type H 4 PVMo 11 O 40 -based ionic liquid catalysts for n -caprylic acid esterification

“…Upon withdrawing the products in the upper layer, the precipitated catalyst could then be recycled after simple filtering and washing treatments. Similar behaviors were also found in other HPA-IL systems [29,37,43].…”

“…S1a of the Supplementary materials, the parent MIM-PS IL showed only a weight-loss peak centering at ca. 642 K[36,37]. Since the [MIM-PSH] x H 4−x PVMo 11 O 40 (x = 1.0−4.0) catalysts exhibit similar thermal properties, hence, similar TGA-DTG profiles were observed.…”

“…Clearly, the parent sulfonated MIM-PS ionic liquid indeed possessed some acidity, which was capable of catalyzing the esterification reaction [37,42]. In comparison, the pristine H 4 PVMo 11 O 40 catalyst, which possessed an ultra-strong acidity, showed an improved product yield (86.4%).…”

Ionic Liquid–Silicotungstic Acid Composites as Efficient and Recyclable Catalysts for the Selective Esterification of Glycerol with Lauric Acid to Monolaurin

“…Conventionally,h omogeneousc atalysts, such as H 2 SO 4 ,H Cl, H 3 PO 4 , p-toluenesulfonic acid, or acidic ionicl iquids, are commonly exploited for esterification reactions. [8,9] However,t he applicationsoft hese mineral acids are hampered by severe environmental and recovery cost issues. Their inherents hortcomings include their highly corrosive, toxic, non-dissociable, intricate separation and purification, making recovery/reuse rather impractical.…”

Efficient Hydrolysis of Lignocellulose by Acidic Ionic Liquids under Low-Toxic Condition to Microorganisms

“…Because of their remarkable capacity to delignify and solubilize cellulose, the ILs are often used for pretreating lignocellulosic biomass before hydrolysis [10][11][12][13][14][15]. On the other hand, Davis et al reported acidic ILs having an acidic group such as a sulfo group in their cationic and/or anionic structures [16][17][18][19][20], and the acidic ILs exhibit higher catalytic activity in cellulose hydrolysis compared to sulfuric acid [21].…”