Study on the Green Nitration of Toluene in a Microglass Reactor

2011 ◽  
Vol 396-398 ◽  
pp. 2018-2022
Author(s):  
Bin Dong Li ◽  
Jian Wu ◽  
Xiao Ming Ma
Keyword(s):  
Ionic Liquids ◽  
Nitric Acid ◽  
Continuous Processing ◽  
Efficient Process ◽  
Controlled Conditions ◽  
Recyclable Catalysts

Continuous processing in the microreactor represents a novel way for the safe and expedient conduct of high energetic nitration. Apart from handling benefits,nitration in microreactors proceed under precisely controlled conditions providing improved yields and selectivity. This paper studied the nitration of toluene in the microglass reactor using concentrated nitric acid as the nitrating agent and SO3H-functional ionic liquids, Lanthanide(iii) trifluoroacetate as recyclable catalysts. We described a mild, efficient process for the nitration of toluene.

Nmp-based ionic liquids: Recyclable catalysts for both hetero-Michael addition and Knoevenagel condensation in water

2018 ◽  
Vol 48 (9) ◽  
pp. 1060-1067 ◽  
Author(s):  
Pengkun Yang ◽  
Yawei Liu ◽  
Ling Chai ◽  
Zhenzhen Lai ◽  
Xiaomin Fang ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Michael Addition ◽  
Knoevenagel Condensation ◽  
Recyclable Catalysts

scholarly journals Highly Active Trifloaluminate Ionic Liquids as Recyclable Catalysts for Green Oxidation of 2,3,6-Trimethylphenol to Trimethyl-1,4-Benzoquinone

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1469
Author(s):  
Piotr Latos ◽  
Agnieszka Siewniak ◽  
Natalia Barteczko ◽  
Sebastian Jurczyk ◽  
Sławomir Boncel ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquids ◽  
High Selectivity ◽  
Active Phase ◽  
Catalytic Performance ◽  
Reaction Parameters ◽  
Multiwalled Carbon ◽  
Highly Active ◽  
Recyclable Catalysts ◽  
Fold Excess

An effective method for the synthesis of 2,3,6-trimethyl-1,4-benzoquinone via the oxidation of 2,3,6-trimethylphenol as the key step in the in the preparation of vitamin E was presented. An aqueous solution of H2O2 was used as the oxidant and Lewis acidic trifloaluminate ionic liquids [emim][OTf]-Al(OTf)3, χAl(OTf)3 = 0.25 or 0.15 as catalysts. Trifloaluminate ionic liquids were synthesised by the simple reaction between 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (triflate) [emim][OTf] and aluminium triflate used in sub-stoichiometric quantities. The influence of the reaction parameters on the reaction course, such as the amount and concentration of the oxidant, the amount of catalyst, the amount and the type of organic solvent, temperature, and the reaction time was investigated. Finally, 2,3,6-trimethyl-1,4-benzoquinone was obtained in high selectivity (99%) and high 2,3,6-trimethylphenol conversion (84%) at 70 °C after 2 h of oxidation using a 4-fold excess of 60% aqueous H2O2 and acetic acid as the solvent. The catalytic performance of trifloaluminate ionic liquids supported on multiwalled carbon nanotubes (loading of active phase: 9.1 wt.%) was also demonstrated. The heterogeneous ionic liquids not only retained their activity compared to the homogenous counterparts, but also proved to be a highly recyclable catalysts.

Functional Ionic Liquids as Efficient and Recyclable Catalysts for the Methylation of Formaldehyde with Aromatics

2016 ◽  
Vol 146 (7) ◽  
pp. 1264-1272 ◽  
Author(s):  
Heyuan Song ◽  
Fuxiang Jin ◽  
Ronghua Jin ◽  
Meirong Kang ◽  
Zhen Li ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Recyclable Catalysts
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