the prediction of the flash point for aqueous-organic solutions

• Main Author: 邱益裕
• Other Authors: 廖宏章
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/27968442054698482826

碩士 === 中國醫藥學院 === 環境醫學研究所 === 91 === A mathematical model for predicting a binary aqueous-organic solutions and an analogous model for predicting the flash point of multiple components aqueous-organic solutions has been proposed, in order to predict the flash point for multi-component solutions. The binary aqueous-organic solutions, water + methanol, water + ethanol, water + n-propanol, and water +2-propanol were used as an example to valid this proposed model for a binary aqueous-organic solutions. The results were plotted against the predictive curves from the flash point prediction model and those simulated by the model described by Crowl & Louvar. The method described by Crowl & Louvar can only be used to estimate the flash point of a binary aqueous-organic solution for the composition range of water composition close to zero, and can not be applied to the composition range of water composition apart from unity. The results reveal that this model is able to precisely predict the flash point over the entire composition range of binary aqueous-organic solutions by way of utilizing the flash-point data pertaining to the flammable component. The ternary aqueous-organic solutions, water + methanol + ethanol, and water + methanol +2-propanol were used as an example to valid this proposed model for a termary aqueous-organic solutions. The results reveal that the model is able to precisely predict the flash point over the entire composition range of multiple components aqueous-organic solutions by way of utilizing the flash point of the individual components. If the binary parameters for a ternary solution are not accessible, such a model based upon the binary parameters of binary solutions may provide a very acceptable means of predicting flash point for a ternary solution as revealed by a comparison between predicted and experimental data. The composition effect on flash point derived in this manuscript can be used in the analysis of the sensitivity of flash point variation for dilution with water, and such a result can be applied in the process safety design/operation to decide if the dilution of a flammable liquid with water is effective at specified composition.