Ethyl chloride is a colorless, flammable gas or refrigerated liquid with a faintly sweet odor. Its chemical formula is C2H5Cl. It should be stored in a cool place below 120°F and away from fire or flames. Ethyl chloride is produced through the hydrochlorination of ethylene and was formerly used as a refrigerant, aerosol propellant, and anesthetic. Its only major current use is in treating cellulose to make ethylcellulose.