The implementation of GHS (Globally Harmonized System of Classification and Labeling of Chemicals) is the international trend, and Taiwan has implemented GHS since 2008. In the implementation of GHS, the flash point of mixtures is the critical property to classify flammable liquids. The flash point value of liquids is the primary parameter in hazard classification for the flammable liquids. If a flash point prediction model for mixtures is developed, the flash point of mixtures can be estimated rapidly and economically, and it is helpful in the promotion of GHS.
The problem of classification of flammable liquids was faced in 2008 in Taiwan, and it is urgently and immediately necessary to be resolved. This study is to give a solution for the estimation of flash point for mixtures, the necessity for classification of flammable liquids. The traditional models for predicting flash point of mixtures usually by the activity coefficient approach. However, the parameters of activity coefficient were regressed from phase equilibrium data in the literatures. If there is no such parameter in literatures for the desired mixture, the model cannot predict the flash point oft hat mixture. Thus, this research aims at the improvement of deficiency of the flash point prediction models in the literatures by useing UNIFAC (Universal Quasi-chemical Functional Group Activity Coefficient) equation, Dortmund-UNIFAC equation and Lyngby-UNIFAC equation. In this study, we were aim at the prediction model for miscible mixtures.
From the result, it is suggested to use different type of UNIFAC equation to estimast activivity coefficient in the predition of flash point for different mixture type.
In addition to the academic value, the result can be applied to help the government and industries to promote the implementation of GHS. Potential application for the model concerns the assessment of fire and explosion hazards, and the development of inherently safer designs for chemical processes.
