Studies On Volumetric Properties Of Ionic Liquids [C_nmim] [Ac]?n=3,4,5,6??[C_nPy][NO₃]?n=3,6? Aqueous Solution

Ionic liquid is also called the room temperature ionic liquids or room temperature molten salts, is completely made up of ionic substances at room temperature or near room temperature. Due to ionic liquids with low steam, low melting point, wide electrochemical window, less volatile, no pollution, easy synthesis, adjustable performance and so on the unique physical and chemical properties,so the research and application has been wide concerned of the researchers in the world. Ionic liquids have many the application in green catalysis, green solvents, green synthesis, extraction. The chemical and physical properties of ionic liquids research can provide an important basis for its application, is the important foundation of related industrial development and exploit. Now, an important development direction of ionic liquids is based on physical properties and chemical properties of database, In order to better understand the performance of the ionic liquid and its improvement, To better make use of the function of the ionic liquid, With the deepening applied research of the ionic liquids, Has carried out the corresponding basic physical property research, including its density, phase equilibrium,the infinite dilution activity coefficients, the apparent molar volume,viscosity,conductivity,refractive index etc,But for the physical and chemical properties ionic liquids and the solvent mixture binary solution research report also is less,so the article takes [C_nmim][Ac]?n23,4,5,6??[C_nPy][NO₃]?n=3,6? six ionic liquids aqueous solution as research object. On the volumetric properties of physicochemical properties as the research subject, completed the following work:[C_nmim][Ac]?n=3,4,5,6??[C_nPy][NO₃]?n=3,6? six ionic liquids were prepared by the neutralization method and characterized by 'H NMR spectroscopy and differential scanning calorimetry ?DSC?.Because ionic liquid's purity has great influence for its physicochemical properties,so before the experiment measured the water content of ionic liquid, and the result is less than 0.5%. then make the concentration range from 0.05000 to 3.0000 mol · kg-1[C_nmim][Ac]?n=3,4,5,6??[C_nPy][NO₃]?n=3,6? six kinds of ionic liquids aqueous solution , the densities of ionic liquids aqueous solution were measured in the concentration from 0.05000 to 3.0000 mol·kg-1 over the temperatures range from 283.15 to 323.15 K. The coefficient of thermal expansion of the solution, ?, apparent molar volume,?VB, the apparent molar expansibility of the solute,?E, were calculated,comparing the result ?E?cal.? by Harned-Owen equation, the calculated results agree well.And the corresponding parameters ?MX?0?V ,?MX?1?V and CMXV were obtained by pitzer equation. Comparing the values of VB0 obtained by Pitzer's equation with those values of V?0 calculated by Redlich and Meyer's equation shows the calculated results agree well.