Atmosferik basınçta imidazolyum tuzları ile CO2’nin halkalı karbonatlara dönüşümü

Year 2022, Volume: 12 Issue: 3, 923 - 935, 15.07.2022

Emine Aytar

https://doi.org/10.17714/gumusfenbil.1108451

Abstract

Küresel ısınmaya neden olan CO2 doğal olarak bol bulunan, ucuz, genellikle sentez reaksiyonları için yapı taşı olarak kullanılabilen, toksik olmayan karbon (C1) kaynağı ve katma değerli kimyasal olarak bilinen inert bir maddedir. Kinetik eylemsizliği ve termodinamik kararlılığı nedeniyle verimli kullanımı zor olan CO2'nin bir katalizör yardımı ile halkalı karbonatlara dönüşümü en umut verici olan çalışmalardır. Bu nedenle bu çalışmada, 1-bütil-3-metilimidazolyum iyodür ([Bmim]I) ve 1-bütil-3-metilimidazolyum hekzaflorofosfat ([Bmim]PF6) imidazolyum tuzları CO2'nin epoksitler ile halkalı karbonatlara dönüşümünde katalizör olarak kullanılmıştır. Hem yüksek basınç ve yüksek sıcaklık altında hem de atmosferik basınç altında halkalı karbonatlara dönüşüm çalışmaları gerçekleştirilmiştir. Otoklavda yüksek verim sağlayan iyonik sıvılar atmosferik ortamda da oldukça iyi sonuçlar vermiştir. Atmosferik ortamda sürenin (2 saat ve 24 saat) ve sıcaklığın (60 °C ve 100 °C) etkisi ile optimizasyon çalışmaları gerçekleştirilmiştir. İyonik sıvılar ile katalize edilen bu sürecin, CO2'nin atmosferik ortamda kimyasal dönüşümü için de umut verici olduğu belirlenmiştir.

Keywords

Epoksit, Halkalı karbonat, Ilımlı koşullar, İyonik sıvılar, Karbon dioksit

Conversion of CO2 to cyclic carbonates by imidazolium salts at atmospheric pressure

Abstract

CO2, which causes global warming, is a naturally abundant, inexpensive, inert substance known as a non-toxic carbon (C1) source and value-added chemical, which can often be used as a building block for synthesis reactions. The conversion of CO2, which is difficult to use efficiently due to its kinetic inertia and thermodynamic stability, to cyclic carbonates with the help of a catalyst are the most promising studies. Therefore, in this study, 1-bütyl-3-methylimidazolium iodide ([Bmim]I) and 1-bütyl-3-methylimidazolium hexafluorophosphate ([Bmim]PF6) imidazolium salts were used as catalysts in the conversion of CO2 into cyclic carbonates with epoxides. Conversion studies to cyclic carbonates were carried out under both high pressure and high temperature and atmospheric pressure. Ionic liquids, which provide high efficiency in the autoclave, also gave very good results in the atmospheric ambient. Optimization studies were carried out with the effect of time (2 hours and 24 hours) and temperature (60 °C and 100 °C) in the atmospheric ambient. It has been determined that this process, catalyzed by ionic liquids, is also promising for the chemical conversion of CO2 in the atmospheric ambient.

Keywords

Epoxide, Cyclic carbonate, Mild conditions, Ionic liquids, Carbon dioxide

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