In our chemical process engineering industries, the technology of basic engineering is hindered due to lack of acknowledgement of the importance in the measurement of VLE, VLLE, LLE, physical properties and the development of the thermodynamic database(D/B). IPA azeotropic distillation processes are important for Chemical Engineering in considering separation factors of mixture, recycling the solvent, and the manufacturing the fine chemicals from an industrial standpoint. In azeotropic distillation, a mass separating agent or entrainer, inverts the difference in volatilities between the light and heavy keys, and adds a degree of the freedom to separation process. In this work, LLE data of IPA-Water-Entrainer system are measured. N-hexane, cyclohexane, benzene are used as entrainer for the measurement of LLE. Utilization of these experimental data will be able to develop the thermodynamics D/B and process models. The selection of proper entrainer and optimized the process and operating conditions are also proposed. This work will also provide chemical engineering industries the competitive basis in building the skills and knowledge for basic and detail engineering in our separation processes.