Plastic-Derived Solid Acid Catalysts for the Production of Methyl 2-Hydroxyisobutyrate via Esterification
- Authors
- Yun, Jimin; Kim, Sangwon; Jung, Wonjong; Jung, Ji Chul
- Issue Date
- Aug-2024
- Publisher
- KOREAN INSTITUTE CHEMICAL ENGINEERS
- Keywords
- Methyl 2-hydroxyisobutyrate; 2-Hydroxyisobutyric acid; Esterification; Sulfonation; Plastic-derived catalyst
- Citation
- KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.41, no.8, pp 2297 - 2306
- Pages
- 10
- Journal Title
- KOREAN JOURNAL OF CHEMICAL ENGINEERING
- Volume
- 41
- Number
- 8
- Start Page
- 2297
- End Page
- 2306
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/92084
- DOI
- 10.1007/s11814-024-00154-w
- ISSN
- 0256-1115
1975-7220
- Abstract
- In this study, we successfully prepare solid acid catalysts using plastic as the starting material for the production of methyl 2-hydroxyisobutyrate (HBM) through the esterification of 2-hydroxyisobutyric acid (HBA) and methanol. Polyethylene (PE) and polyvinyl chloride (PVC) are sulfonated at different temperatures (X) to obtain sulfonated polymer catalysts (SPE_X and SPVC_X). Various characterizations clearly confirm the introduction of sulfonic acid groups (-SO3H groups), which serve as active sites in this reaction, on the PE and PVC surfaces via sulfonation. For the SPVC_X catalysts, an excessively high sulfonation temperature facilitate the loss of chlorine groups (-Cl groups) via dehydrochlorination, resulting in a decrease in catalytic activity. In particular, the -Cl groups improve the acidic properties and accessibility of reactants to the -SO3H groups of the SPVC_X catalysts, leading to a high HBM yield. Therefore, the SPVC_120 catalyst show the highest HBM yield (ca. 75%) because of the abundant -SO3H and -Cl groups on the catalyst surface. Furthermore, the catalytic performance of the SPVC_120 catalyst surpassed those of commercial ion-exchange resins such as Amberlyst-15 and Nafion NR50, which are representative solid acid catalysts for esterification.
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