The invention discloses a portable sterilizer for use when filling containers for transporting goods under aseptic conditions, which provides increased transport capacity. For washing, it uses chemicals, circulation waters and the hot water (or any other liquid poured into said boiler) produced from the liquid phase inside said portable boiler. The device may include a pump for pressure washing with other types of cleaners, cold water, chemicals, etc. For sterilizing, it uses the vapour phase of water or other liquids in said portable boiler, ultraviolet rays and/or another means of sterilization, and it is connected between the outlet of the pasteurization system of a production plant and the return lines of said pasteurizer. Said system is connected by means of flexible hoses.
