## 3 Results and Discussion
### EHS Analysis  
In general, type 5 DES are considered as comprising \"green\" components that are environmentally benign. The four HBA and four HBD selected from Section 3.2 are evaluated for this merit through a search of the available safety data sheet (SDS) data from Fischer Scientific [31; 39]. The values that were unable to be determined were run through the VEGA KNN-based environmental health and safety (EHS) software, for which a further description can be found in Section 2.2. Table 5 contains the results of this study where the green (g) indicates a lower than moderate score of NFPA and/or OSHA rating, blue (b) indicates unreliable predictions due to missing data in VEGA and no available data found in the SDS database. Red (r) indicates moderate or higher NFPA and/or OSCHA rating for the property. The solvent components were studied rather than their combination, as DES readily dissociates in the presence of water in the environment. Of the values in the study, only one is red, being from MTOA as it possesses moderately acute toxicity. MTOA also contains two unavailable/unpredictable properties in regard to BCF and carcinogenicity. N4 Br is indicated as safe in all areas except for soil persistence, BCF, and carcinogenicity for which there was no available data and thus it was unable to be reliably predicted. N8 Br contained the least amount of information with all properties being unavailable, except mutagenicity and acute toxicity which were benign. Camphor and eucalypt both show the absence of negative properties except for air persistence, for which no data were available and unreliable predictions were made. PEG contained none of the adverse properties. BTACI contained none of the studied properties with the exception of BCF and carcinogenicity, which were undetermined. Due to the lack of significant harmful properties, the components studied have strong potential for use as environmentally safe alternatives to conventional systems. Thus, MTOA is not recommended as an HBA but the other 12 DES are candidates for this application. Diffuoromethane is considered extremely flammable with an NFPA rating of 4, but is relatively non-toxic [32; 40]. The inclusion of diffuoromethane into the working fluid may attribute this characteristic to the solution, and precautions should be undertaken accordingly.  
\begin{table}
\begin{tabular}{l c c c c c} \hline \hline \multirow{2}{*}{**HBD**} & **Pressure** & \multirow{2}{*}{**N4 Br**} & **BTACI** & **N8 Br** & **MTOA** \\  & **(Bar)** & & & & \\ \hline Camphor & 1 & 24.2 & 22.3 & 24.2 & 19.2 \\ Camphor & 3 & 49.8 & 48.3 & 49.8 & 43.9 \\ Camphor & 6 & 70.7 & 70.3 & 70.7 & 66.4 \\ Camphor & 9 & 85.8 & 85.6 & 84.7 & 86.2 \\ Eucalyptus1 & 1 & 22.9 & 20.9 & 22.9 & 18.0 \\ Eucalyptus1 & 3 & 47.8 & 46.2 & 47.8 & 41.8 \\ Eucalyptus1 & 6 & 68.9 & 68.6 & 68.9 & 64.2 \\ Eucalyptus1 & 9 & 86.0 & 85.6 & 84.5 & 86.2 \\ Lidocaine & 1 & 23.8 & 22.2 & 23.8 & 19.4 \\ Lidocaine & 3 & 50.2 & 48.8 & 50.2 & 44.8 \\ Lidocaine & 6 & 71.6 & 71.2 & 71.6 & 67.7 \\ Lidocaine & 9 & 83.7 & 83.1 & 81.4 & 84.0 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Pressure study of the top 16 performingsolvents. The solubility of diffusuoromethane in DES is represented as mol/mol%. The system pressure is in bar.