Study On The Reactions Of Rosin And Turpentine Catalysized By Acdic Room-Temperature Ionic Liquids

At first, we prepared 1-Emtyl-3-methylimidazolium Bromide ([C₂mim]Br), 1-n-Butyl-3-methylimidazolium Chloride ([C₄mim]Cl), 1-n-octyl-3- methylimidazo -lium Chloride ([C₈mim]Cl). Then, 1-Emtyl-3-methylimidazolium tetrafluoroborate ([C₂mim]BF₄), 1-n-Butyl-3-methy- limidazolium hexafluorophosphate ([C₄mim]BF₄) , 1-n-Octyl-3-methylimidazolium tetrafluoroborate ([C₈mim]BF₄), 1-Emtyl-3-methylimidazolium choroaluminate (III) ([C₂mim]Br-AlCl₃), 1-n-Butyl-3-methylimidazolium choroaluminate (III) ([C₄mim]Cl-AlCl₃) and 1-n-Octyl-3 -methylimidazolium choroaluminate (III) ([C₈mim]Cl-AlCl₃) have been synthesized. [C₂mim]Br, [C₄inim]Cl, [C₈mim]Cl, [C₂mim]BF₄, [C₄mim]BF₄ and [C₈mim]BF₄ have been characterized and analyzed by UV, IR, ¹H-NMR and ¹³C-NMR spectra. As [C₄mim]Cl-AlCl₃ for example, the acidity of such ionic liquids have been determined by using pyridine as IR spectroscopic probe and the method ofHammett.The esterification of terpineol, the polymerization of turpentine and rosin are important processes in chemistry and industry of forest products. These reactions are concerned with using the inorganic acid as catalysts. Such traditional catalysts used in the processes are H₃PO₄, H₂SO₄, and AlCl₃, which are of some drawbacks such as too large amounts of usage, which need to be neutralized after the reaction and may result in pollution to the environment, and no regenerable. Consequently, methods that successfully minimize their use or recycle them are much attention. On the basis of understanding of the drawbacks of these processes and the advantage of ionic liquids, the synthesized composite catalytic systems of ionic liquids were firstly used as...