Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Inhibition of Side Reactions Forming Dimers of Diols in the Selective Hydrogenation of Methacryl Aldehyde

메타아크릴 알데히드의 선택적 수소화에서 2가 알코올의 이합체 형성 부반응 억제효과

  • Kook-Seung Shin (Lotte Chemical R&D Center) ;
  • Mi-Sun Cha (Lotte Chemical R&D Center) ;
  • Kyoung-Ku Kang (Department of Chemical Engineering, Dong-Eui University) ;
  • Chang-Soo Lee (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
  • 신국승 (롯데케미칼 연구소) ;
  • 차미선 (롯데케미칼 연구소) ;
  • 강경구 (동의대학교 공과대학 화학공학과) ;
  • 이창수 (충남대학교 공과대학 응용화학공학과)
  • Received : 2023.05.14
  • Accepted : 2023.06.06
  • Published : 2023.06.30
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Abstract

The homogeneous catalyst, Ru-MACHO-BH, selectively performs hydrogenation reactions only on the carbonyl group of α, β-unsaturated aldehyde compounds with extremely high reactivity and selectivity. However, the hydrogenation of α, β-unsaturated aldehydes involves a heterogeneous Diels-Alder reaction, resulting in the formation of significant amounts of byproducts, such as dimers. In this study, we used the Ru-MACHO-BH catalyst (Carbonyl hydrido (tetrahydroborato) [bis (2-diphenyl phosphino ethyl) amino] ruthenium(II)) to selectively hydrogenate the carbonyl group of a specific type of α, β-unsaturated aldehyde called methacryl aldehyde, leading to the synthesis of methallyl alcohol. Simultaneously, we applied diols to inhibit the formation of byproducts. The results demonstrate that monoethylene glycol can significantly reduce the formation of diols. Based on these results, we effectively suppressed the formation of dimers containing vinyl groups in methacryl aldehyde by using hydroquinone, which can efficiently inhibit the chemical interaction of vinyl groups. Consequently, the conversion rate of methacryl aldehyde was increased. Ultimately, by reducing the amount of the expensive homogeneous catalyst Ru-MACHO-BH to 1/10, we achieved a selectivity of over 90% and a yield of over 80% for the desired product, methallyl alcohol. These results provide a method to minimize yield reduction while reducing the usage of expensive catalysts, thereby improving cost-effectiveness. We expect that the reaction could be applied to various kinds of selective hydrogenation and has been successfully run on an industrial scale.

Ru-MACHO-BH 촉매는 α, β-불포화 알데히드 화합물들의 카르보닐기(carbonyl group)만을 선택적으로 수소화 반응을 수행할 수 있다. 그러나 α, β-불포화 알데히드의 수소화 반응은 불균일 딜즈-앨더 반응을 수반하여 부산물인 이합체를 다량 생성한다. 본 연구에서는 Ru-MACHO-BH (Carbonyl hydrido (tetrahydroborato) [bis (2-diphenyl phosphino ethyl) amino] ruthenium(II)) 촉매를 이용하여, α, β-불포화 알데히드의 한 종류인 메타아크릴 알데히드(methacryl aldehyde) 화합물의 카르보닐기만 선택적으로 수소화 반응을 시켜 메타아릴 알코올(methallyl alcohol)을 합성하며, 동시에 2가 알코올을 부반응 억제제로 적용하였다. 이 결과는 모노 에틸렌 글리콜(mono ethylene glycol)이 이합체의 생성을 현저히 저감 시킬 수 있음을 보여주고 있다. 이러한 결과를 바탕으로 비닐기의 화학적 상호작용을 효과적으로 억제할 수 있는 하이드로퀴논을 사용하여 메타아크릴 알데히드에 존재하는 비닐기의 이합체 형성을 효과적으로 억제할 수 있었으며, 결국 메타아크릴 알데히드의 전환율을 상승시킬 수 있었다. 최종적으로, 고가의 귀금속 균일촉매인 Ru-MACHO-BH의 투입량을 1/10로 줄인 상태에서 원하는 생성물인 메타아릴 알코올의 선택도는 약 90% 이상, 수율은 약 80% 이상을 확보할 수 있었다. 이 결과는 수율 감소를 최소화하는 동시에 고가의 촉매 사용량을 저감하여 경제성을 향상시킬 수 있는 방법을 찾을 수 있게 하였다.

Keywords

Acknowledgement

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2021R1A2C3004936).

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