Abstract
Ionic liquids (ILs) have a wide range of applications, owing to their negligible vapor pressure, high electrical conductivity, and low melting point. However, the thermal hazards of ILs and their mixtures are also non-negligible. In this study, the thermal hazards of various binary imidazolium ionic liquids (BIIL) mixtures were investigated. The effects of parent salt components and molar ratios on the thermal decomposition temperature (Td) and flashpoint temperature (Tf) are investigated. It is found that both Td and Tf increase as the proportion of highly thermally stable components in BIIL mixtures increases. Furthermore, the decomposition process of BIIL mixtures can be divided into two stages. For most molar ratios, the Tf of the BIIL mixtures is in the first stage of thermal decomposition. When the proportion of highly thermally stable components is relatively high, Tf is in the second stage of thermal decomposition. The flammability is attributed to the produced combustible gases during the thermal decomposition process. This work would be reasonably expected to provide some guidance for the safety design and application of IL mixtures for engineering.
Highlights
Ionic liquids (ILs) are new green solvents composed of organic cations and organic or inorganic anions which possess excellent physical and chemical properties [1,2,3,4,5]
The 5% onset decomposition temperature (Td5% ) is used as a parameter to characterize the thermal stability of binary imidazole ionic liquids (BIIL) mixtures
Is found that when proportion highly thermally stable componentsis stant. It isItfound that when thethe proportion of of thethe highly thermally stable components islower, lower,the thethermal thermalstability stabilityofofBIIL
Summary
Ionic liquids (ILs) are new green solvents composed of organic cations and organic or inorganic anions which possess excellent physical and chemical properties [1,2,3,4,5]. Many studies have pointed out that the thermal hazard of ILs is inextricably linked to the thermal decomposition properties [24,25,26,27,28,29]. It is of great theoretical and practical significance to study the thermal decomposition properties of IL mixtures for safe design and safety control in industrial processes
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