Fundermental Engineering Research Of Composite Ionic Liquid Catalyzing Isobutane Alkylation

To be compared with commercial H2SO4 or anhydrous HF alkylation process, composite ionic liquid (CIL) catalyzing isobutane alkylation process produces higher quality alkylate gasoline and is a more environmental friendly process. CIL alkylation process has been proven by a pilot plant, and developing and scaling-up CIL alkylation processes to industrial scale require fundamental engineering research of CIL alkylation process.The research need to measure physical properties of CIL including density, viscosity, melting point and vapor pressure. Investigate the effect of temperature, AICI3 contents and CuC1 addition on the density and voscisoty of CIL. Apply standard curve of density and online infared method determine the solubility of toluene/tetrachloroethylene, and use online infared method to measure the solubility of isomery and normal alkane from C5 to C8 in CIL separately. Further study the effect of solid contents and main alkylates component TMP contents on the density and viscosity of CIL respectively.According to results of the above research, it found that density of CIL decreases linearly with temperature increasing. Viscosities of CIL reach two to three orders of magnitude higher than water or common organic solvent. Relation between viscosity of CIL and temperature is better fitted with Vogel-Tammann-Fulcher (VTF) equation than Arrhenius equation. Dichloromethane (DCM) is miscible with fresh and spent CIL. Solubility of toluene in fresh and spent CIL is 124.43 and 64.32 g/100 g separately. Addition of small amount of DCM or toluene apparently results in steep decrease of viscosity of CIL. Compared with addition of toluene, viscosity of spent CIL decreases more quickly with addition of DCM. Hence DCM is more suitable as a solvent to decrease the high viscosity of spent CIL, and is helpful to the separation of solid from spent CIL. Densities of CIL decrease linearly with increasing of solid contents, whereas viscosities of CIL increase approximately linearly with the solid contents increasing. Solubility of isomery and normal alkanes from C5 to C8 in CIL is small and range between 1.37 g/100 g for 2,2,4-trimethylpentane and 3.54 g/100 g for 2-methylbutane. Equation of ideal mixed solution can be practiced to predict the density and viscosity of TMP and CIL solution, and the mean relative error are 0.04% and 0.27% respectively. All obtained reliable data will be made as reference for the engineering design and advanced research on the physical and chemical properties of CIL.