Vacuum evaporator consists of a crystallizer 2 heater, 2 separators, a vapor-liquid separator, condenser, vacuum pump, forced circulation pump, discharge pump, cockpit pump, electric cabinet, and a working platform. All pipe fittings, valves, equipment are supplied with the system. Salt-water mixture in the laminar pans crystallizes with steam under pressure, and because of the high pressure, the vapor from each pan is enough to crystallize the other pan.