| With the posing of the conception of green chemistry, the researchers are gradually focused on the studying of new approaches and matters that are non-toxic, no pollution, environmental friendly. Because of its excellent properties, ionic liquids obtain the widespread attention, and with the supercritical CO2 and aqueous two-phase system are called three of the 21 st century green chemical solvents.Our laboratory has focused on researching imidazole salt acetate ionic liquid for a long time. It is found that studying the ionic liquid,s precursor— alkyl imidazole and intermediates is very important but in the process of research, which relates to the synthesis, purification and application of ionic liquids.For various reasons, this thesis mainly studies the following three aspects:a. Researching the density, viscosity, refractive and surface tension of N-alkylimidazole(Mim/Eim/Pim/Bim) at different temperature. According to the datas, we found that under the same temperatures, the density、the refraction, and the surface tension of different alkyl imidazoles decrease with the increaseing of alkyl chains; but the absolute viscosity, increase with the increaseing of alkyl chains. With the increaseing of temperature,the density, viscosity, refractive and surface tension of alkyl imidazoles all showed a lowing trend. The thermal expansion coefficient of alkyl imidazole, kinematic viscosity and surface entropy decrease with the increaseing of temperature.b. Studying the density, viscosity, refractive properties of N-alkylimidazole with different solvents(methanol/ethanol/water/acetic ester) binary system at 308.15 K etc. By measuring the excess volume, viscosity deviation and refractive deviation,which shows that N- methyl/ethyl imidazole with solvents, molecular interactions pecking order for N-methyl/ethyl imidazole- water > N- methyl/ethyl imidazole-methanol / > N- methyl/ethyl imidazole ethanol > N- methyl/ethyl imidazole- ethyl acetate; And between water and alkyl imidazole hydrolysis; Ethyl acetate with alkyl imidazole molecule space between effective rearrangement.c. Synthesis of N- methylimidazole ionic liquid intermediates 1, 3- dimethyl imidazole- 2- carboxylic salt(1, 3- di Mi M- 2- COO). Testing the conductivity of synthetic brine solution, calculating the molar conductivity,which help us speculating thatthe conductive mechanism is the result of salt hydrolysis; Placed the salt different time in air and took microscope photos that shows the salt has strong absorption to water and after about five hours absorbing water no longer change the material; Nitrogen adsorption test showed that different methods of specific surface area values in m2 / g(162 ~ 236), total pore volume of 0.0842 ml/g, the average aperture 2.06 nm directly. Polarity is expected to make its extension to the absorbent material or gas adsorption material direction. |
