Study On Ionic Liquids For Intensified CO Absorption And Alcoholysis Reaction Processes

Ionic liquids（IL_S）are salts consisting of cations and anions.In the past two decades,ionic liquids have emerged rapidly as non-traditional media or catalysts.Because they have incomparable solubility for various organic and inorganic compounds,and other advantages,such as non-volatile,high thermal stability,strong adaptability,excellent physical and chemical properties.In this paper,two kinds of ionic liquids were designed for gas absorption and catalytic alcoholysis,and their absorption and catalytic properties were studied in depth.The main research contents include:（1）One kind of cuprous-based protic ionic liquid（PIL）,1-ethylimidazolium chlorocuprate（[EimH][CuCl₂]）was synthesized and investigated as a potential absorbent for CO capture.The CO absorption isotherms of[EimH][CuCl₂]was also measured and discussed based on thermodynamic analysis.The results indicated that the capacity of CO absorption in the protic IL[EimH][CuCl₂]was significantly enhanced to 0.118 mol mol^-1 under ambient conditions,about 3 times more than that in the aprotic IL[Emim][CuCl₂].The results of IR and Raman spectroscopic investigations further showed that the proton in the PIL[EmiH][CuCl₂]could weaken the bonding strength of Cu-Cl along with an obvious redshift,making Cu⁺to interact with CO efficiently and resulting in the superior CO capacity.Furthermore,[EimH][CuCl₂]exhibited high ideal selectivity of CO and excellent reversibility for the absorption of CO.（2）three tetrabutylammonium carboxylate ILs([N₄₄₄₄][CA])were designed.Then,the combination of microchannel reactor with[N₄₄₄₄][CA]IL catalysts was studied for highly efficient synthesis of 1-methoxy-2-propanol via the alcoholysis of PO with methanol.Compared with the efficiency of stirred reactor,the rate of alcoholysis reaction in the T-microreactor was found to be significantly improved as well as the reaction time was remarkably shortened from 180 to 20 minutes with a 92%yield of1-methoxy-2-propanol.In addition,the kinetic parameters of propylene oxide alcoholysis were investigated in detail in this paper,which provided basic data and industrial design basis for the catalytic synthesis of 1-methoxy-2-propanol by ionic liquids in a microchannel reactor.