Experimental Study Of CO2into Aromatic Carboxylic Acid Compounds

Ionic liquid has advantages of non-volatilization, non-corrosion, and great solubility of CO2.2,3-dimethyl benzoic acid was synthesized by the carboxylation of o-xylene and CO2, with chloroaluminate ionic liquid as the catalyst. Process conditions, such as catalyst type, reaction temperature, CO2pressure, the amount of catalyst, as well as activation pretreatment have been studied in this article. The study indicated that the yield of2,3-dimethyl benzoic acid can reach75%under the condition of12g [BMIM]Cl·2AlCl3,60℃, and3.0MPa. Lewis acidity strength of ionic liquids with different molar fractions of aluminum chloride, which was characterized by infrared spectroscopy probed by acetonitrile molecule, was correlated with the performance in carboxylation reaction. The result showed when molar fraction of aluminum chloride increased, the Lewis acidity became stronger, and the catalytic effect got better. By comparing chloroaluminate ionic liquid against AICl3, the study found out the advantages of the former. This article also examines AICl3amount, effect of catalytic carboxylation, and recycling performance of the supported ionic liquid.Electrochemical synthesis uses clean and efficient electricity as catalyst to realize the organic synthesis through electron gain and loss. It avoids catalyst waste and pollution from AICl3powder or chloroaluminate ionic liquid. This article uses the method of electrolytic reduction of CO2, electrolytic reduction of O2/CO2and sacrificial anode for carboxylation reactions of aromatic compounds. In the sacrificial anode method, with ionic liquids as electrolyte, Cu as the anode and Al as cathode, we investigate reduction potential and carboxylation reaction yield of different aromatic compounds, and analyze its reasons from the angle of the electronic structure. Sacrificial anode method is used to synthese of2,3-dimethyl benzoic acid, the yield can reach37.8%, and ionic liquid electrolyte can be repeated...