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首页> 外文期刊>Journal of polymers and the environment >Functionalized Polyethylene Glycol as a Catalyst for Esterification of Salicylic Acid
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Functionalized Polyethylene Glycol as a Catalyst for Esterification of Salicylic Acid

机译：Functionalized Polyethylene Glycol as a Catalyst for Esterification of Salicylic Acid

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In this work, two catalysts based on polyethylene glycol (PEG) containing sulfonic acid group and the -COOH group of citric acid (CA) were synthesized. Characterization of the -SO_3H functionalized PEG and citric acid functionalized PEG has been carried out using FT-IR. The acidity of PEG-SO_3H and PEG-CA has been explored to investigate their catalytic efficiency towards eco-friendly production of methyl salicylate via esterification of salicylic acid using methanol as a reactant as well as solvent. Methanol to acid molar ratios of 4:1, 6:1, 8:1, and 10:1 was applied. The sulfonated PEG is found to be a very active solid acid catalyst giving high yields (82) under the optimized reaction conditions (10:1 M ratio of methanol to acid; reaction temperature, 65 ℃; reaction time, 150 min with catalyst loading of 1.5. In comparison with the catalytic activity of H_2SO_4 PEG-SO_3H, and PEG-CA; the PEG-SO_3H surpassed the catalytic activity of both H_2SO_4 and PEG-CA. The IEC of PEG-SO_3H was 4 meq/g. And the maximum water uptake of PEG-SO_3H was 8.25.

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