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A methodical selection process for the development of ketones and esters as bio-based replacements for traditional hydrocarbon solvents

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JournalGreen Chemistry
DateAccepted/In press - 26 Jun 2018
DateE-pub ahead of print - 6 Aug 2018
DatePublished (current) - 7 Sep 2018
Issue number17
Volume20
Number of pages9
Pages (from-to)4003-4011
Early online date6/08/18
Original languageEnglish

Abstract

A “top down” approach to the development of sustainable, greener, low-polarity solvents is presented. Methyl butyrate, ethyl isobutyrate, methyl pivalate and pinacolone were identified as potential target solvents from trends in Hansen solubility parameters and known physical properties. Solubility, flammability and physical properties were determined which showed their potential to replace traditional, hazardous, volatile, non-polar solvents such as toluene. Each new candidate then demonstrated their suitability to replace these traditional solvents in solubility tests, despite being esters and ketones, each candidate demonstrated their similarity to traditional volatile non-polar solvents in terms of their solubility properties by their ability to dissolve natural rubber, a particularly low-polarity solute. This was reinforced by their performance in a model Menschutkin reaction and a radical-initiated polymerisation for the production of pressure-sensitive adhesives, where their performance was found to be similar to that of toluene. Importantly, a preliminary toxicity test (Ames test) suggested non-mutagenicity in all candidates. Each of the four candidates can be synthesised via a catalytic route from potentially renewable resources, thus enhancing their green credentials.

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© The Royal Society of Chemistry, 2018.

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