Study On Liquid-Liquid Equilibrium And Engineering Application For Mesityl Oxide Removing Phenol System

Clean coal utilization for China’s economic development and energy security has an important role, gasification is one of the main ways of clean coal utilization. In the production process of gasification, there are a large number of phenolic wastewater generated which will cause greater harm to the environment. Phenol extraction can reduce the pollution load of waste water, and phenolic pollutants in the wastewater can be recycled. The development of efficient, low-cost extractant, for both economic and environment will be of great significance. In this study, the equilibrium relationship and engineering applications of mesityl oxide used as the dephenol extractant has been studied.First of all, in this paper taking mesityl oxide as extractant to handle liquid-liquid equilibrium of wastewater containing phenol were studied. Liquid-liquid equilibrium data of mesityl oxide-water-phenol ternary system under 25,40 and 50℃ and mesityl oxide-water-phenol-m-cresol quaternary system phase equilibrium data under 40 ℃ was measured with GC-MS, taking Agilent 6890n/5973MSD as workstations and Agilent HP—INNOWax as chromatographic column, and plotted the phase diagram mesityl oxide-water-phenol-m-cresol quaternary system were tested and drawed diagrams to study its distribution coefficient and selectivity coefficient. And then we make regression analysis to the calculation using the NRTL activity coefficient model for ternary and quaternary systems LLE data, and by selecting the appropriate value aij,we got ternary binary interaction parameters, the quaternary system between each substance. Using the relative root mean square error the fitting results were evaluated between the experimental and calculated values, in the experimental results show that the temperature range of the ternary system relative root mean square error (RMSE) less than 2%, the quaternary system relative root mean square error (RMSE) less than 3%, indicating NRTL model can well describe the ternary, quaternary system liquid-liquid equilibrium relationship. Binary interaction parameters obtained can be used to predict the behavior of multi-phase systems, but also for the plant design process simulation provides a basis for calculation, laid the foundation for the further application of mesityl oxide as an extractant from the analysis of the theory and practice foundation.Finally, with the use of Aspen Plus simulation software and the equilibrium relationship, the phenol extraction process that mesityl oxide used as phenol extraction solvent is conceptually designed. After sensitivity analysis, the process parameters were optimized to determine the optimum process parameters, which provide the basis data for phenol extractant industrial applications that mesityl oxide used as phenol extraction solvent.