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Facile Utilization of Carbon Dioxide for the Esterification of Potassium Lactate to Butyl Lactate

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Abstract

The utilization of CO2 is crucial for the sustainable growth of human society. Herein, we present the direct esterification of potassium lactate (KL) with butanol under CO2 pressurization, resulting in the synthesis of butyl lactate (BL). The pressurized CO2 reacts with water to generate carbonic acid, thereby facilitating esterification. A single batch reaction yielded 17% of BL, which could be augmented to 36% via two successive operations. Ultimately, through the utilization of a minimal quantity of H2SO4 in the final step, the complete conversion of KL to BL was achieved with a selectivity exceeding 99%. The proposed integrated process necessitates approximately 63% less mineral acid compared to conventional lactate separation. An exploration of the effect of various reaction parameters, including reaction temperature, duration, CO2 pressure, and H2O content in the KL, was also conducted.

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Data availability

All data presented in this study is available from the corresponding authors upon request.

Abbreviations

BL:

Butyl lactate

CaO:

Calcium oxide

CO2 :

Carbon dioxide

LA:

Lactic acid

N2 :

Nitrogen

KL:

Potassium lactate

KHCO3 :

Potassium bicarbonate

H2SO4 :

Sulfuric acid

K2SO4 :

Potassium sulfate

KOH:

Potassium hydroxide

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Acknowledgements

This study was supported by Carbon Upcycling Project for Platform Chemicals (Grant number: 2022M3J3A1085580) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT, Republic of Korea and the Ministry of Trade, Industry, and Energy of the Republic of Korea (No. 20202020800330).

Funding

The National Research Foundation of Korea, 2022M3J3A1085580, Young Kyu Hwang.

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Authors and Affiliations

  1. Green Carbon Research Center, Korean Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Republic of Korea

    Ali Awad, Anil H. Valekar, Kyung-Ryul Oh, Ajay S. Nimbalkar, Ji Hoon Kim, Changho Yoo & Young Kyu Hwang

  2. Department of Advanced Materials and Chemical Engineering, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea

    Ali Awad, Ajay S. Nimbalkar & Young Kyu Hwang

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  1. Ali Awad
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  2. Anil H. Valekar
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  3. Kyung-Ryul Oh
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  4. Ajay S. Nimbalkar
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Correspondence to Changho Yoo or Young Kyu Hwang.

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Awad, A., Valekar, A.H., Oh, KR. et al. Facile Utilization of Carbon Dioxide for the Esterification of Potassium Lactate to Butyl Lactate. Korean J. Chem. Eng. (2024). https://doi.org/10.1007/s11814-024-00017-4

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