TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Imidazole Compound: The imidazole compound is dissolved in a non-aqueous solvent.Preferred Solvent: The non-aqueous solvent is at least one type chosen from propylene carbonate, ethylene carbonate, sulfolane, methyl sulfolane, acetonitrile, dimethyl carbonate, ethylmethyl carbonate, and diethyl carbonate.Preferred Process: The components (a1-a4) are reacted at 0-150 degrees C in the aqueous medium. Preferred Definitions:    X- = PF6-, BF4-, F-.2.3HF, AsF6-, SbF6-, N(RfSO3)2-, C(RfSO3)3- and RfSO3-; and    Rf = 1-12C fluoroalkyl.    SPECIFIC COMPOUNDS - The imidazole compound of formula (1) is 1-methyl imidazole, 1-ethyl imidazole, 1-ethyl-2-methyl imidazole, 1,2-dimethyl imidazole, 1-methyl-2-ethyl imidazole, 1,4-dimethyl imidazole, 1,5-dimethyl imidazole, 1-methyl-2-propyl imidazole, 1-ethyl-2-propyl imidazole, 1-methyl-2-butyl imidazole, 1-ethyl-2-butyl imidazole 1-propyl-2-butyl imidazole and 1-butyl-2-propyl imidazole. The dicarbonyl compound (a1) is at least one of glyoxal and methyl glyoxal. The aldehyde (a3) is at least one of formaldehyde, acetaldehyde, propionaldehyde and butyraldehyde. The primary amine (a4) is methylamine, ethylamine, propylamine and butylamine.    EXAMPLE - 40 % aqueous solution of glyoxal (in wt.pts) (18) and 37 % aqueous solution of formalin (10) were stir-mixed to form a homogenous solution. The temperature of the content was raised to 40 degrees C. Nitrogen gas was passed. A liquid mixture comprising 70 % aqueous solution of ethyl amine (64) and 28 % aqueous solution of ammonia (61) was added, and reacted at 35-45 degrees C for 35 minutes. A liquid mixture of 40 % aqueous solution of glyoxal (127) and 37% aqueous solution of formalin (71) was added for 4 hours. The liquid mixture of ethylamine and ammonia was dropped for 4 hours and 35 minutes. The content was reacted at 40 degrees C for 1 hour. The reacted product was dehydrated at 80 degrees C under pressure of 5.3 kPa to form crude 1-ethyl imidazole. The obtained crude imidazole was distilled at 100 degrees C to form 82 wt.% of 1-imidazole with purity of 97.9 %. Obtained imidazole (96), dimethyl carbonic acid (135) and methanol (192) were taken in an autoclave, and mixed. Temperature of the contents was raised to 130 degrees C. The content were reacted under pressure of 0.5 MPa for 70 hours to form 1-ethyl-3-methyl imidazolium monomethyl carbonate with conversion ratio of 99.5 %. Obtained reaction mixture (423) and fluoroboric acid aqueous solution (209) were stir-mixed for 30 minutes. The foam of carbon dioxide was generated.    The foam was subsided, and obtained reaction solution was passed to a rotating evaporator. The distillation of the solvent was performed. Colorless and transparent liquid comprising 1-ethyl-3-methyl imidazolium tetrafluoroborate (198 g) was obtained. The obtained product was dissolved uniformly in propylene carbonate. An electrolytic liquid having excellent electrochemical stability and voltage with stand property was obtained. The electrolytic liquid comprised 1 ppm or less of chloride ion and potassium ion. The electric double layer capacitor was created using activated carbon electrode cell, separator and the electrolytic liquid. The capacitor had excellent discharge property, and voltage withstand property.