Using metrics and sustainability considerations to evaluate the use of bio-based and non-renewable Brønsted acidic ionic liquids to catalyse Fischer esterification reactions

Sustainable Chemical Processes

James H Clark¹  Thomas J Farmer¹  Duncan J Macquarrie¹  James Sherwood¹ 

[1] Green Chemistry Centre of Excellence, University of York, Heslington, York YO10 5DD, UK

关键词: Metrics;    Ionic liquids;    Green chemistry;    Esterification;    p-Cymenesulphonic acid;    Brønsted acidic ionic liquid;    Bio-based products;   

Others  :  789170
DOI  :  10.1186/2043-7129-1-23

 received in 2013-09-22, accepted in 2013-11-19,  发布年份 2013

【 摘 要 】

Background

Ionic liquids have found uses in many applications, one of which is the joint solvation and catalysis of chemical transformations. Suitable Brønsted acidic ionic liquids can be formed by combining lactams with sulphonic acids. This work weighs up the relative benefits and disadvantages of applying these Brønsted acidic ionic liquid catalysts in esterifications through a series of comparisons using green chemistry metrics.

Results

A new bio-based ionic liquid was synthesised from N-methyl pyrrolidinone and p-cymenesulphonic acid, and tested as a catalyst in three Fischer esterifications under different conditions. An evaluation of the performance of this Brønsted acidic ionic liquid was made through the comparison to other ionic liquid catalysts as well as conventional homogeneous Brønsted acids.

Conclusion

Extending the argument to feedstock security as well as mass utilisation, ultimately in most instances traditional mineral acids appear to be the most sensible option for Brønsted acid esterification catalysts. Ester yields obtained from Brønsted acidic ionic liquid catalysed procedures were modest. This calls into question the diversity of research exploring esterification catalysis and the role of ionic liquids in esterifications.

【 授权许可】

   
2013 Clark et al.; licensee Chemistry Central Ltd.

【 图 表 】

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