Abstract: A device for the evaporative cooling of a viscous fluid, the device including a vacuum chamber wherein the viscous fluid is cooled. The vacuum chamber includes a lower part wherein the viscous fluid is collected by gravitational force, and an outlet pipe, located at the bottom of a lower part, through which the cooled down fluid is extracted. The device also includes an extraction device that itself includes a primary pump, fed with the cooled fluid from the lower part through the outlet pipe, and a feeding device, located inside the lower part, which pushes the cooled down fluid from the lower part towards the primary pump, through the outlet pipe. Also, an apparatus and method for the sterilization, degassing or water concentration of a viscous fluid including the evaporative cooling device.