A thin solution tank is used for concentrated/dilute solution preparation in the pharmaceutical industry. The tank body is equipped with a jacket for heating, cooling, and temperature maintenance. Compared with a concentrated solution tank, the stirring power of the same model of thin solution tank is relatively lower. Generally, it is a fully sealed, vertical, sanitary, and clean container with functions of heating, cooling, heat preservation, and stirring.
For thin solution tanks with heating or cooling functions, the tank body is provided with a jacket, through which heating or cooling media can be introduced for heating or cooling, so that the liquid medicine can be fully dissolved and mixed with the operation of the stirrer. The system configuration of the thin solution tank mainly includes a transmission device, mechanical seal device, temperature control device, spotlight, sight glass, stirring device, manhole feeding port, steam inlet, condensate outlet, material outlet, drain port, sampling port, 360° universal cleaning ball, and some also have orifice plate filtration device, weighing and metering device, liquid level metering device, circulation device, etc. According to the requirements of process characteristics, thin solution tanks include single-layer thin solution tanks, double-layer insulated thin solution tanks, and three-layer heat exchange insulated thin solution tanks.
The volume of thin solution tanks can be customized from as small as 10L to as large as 10m³, generally in a vertical, three-layer insulated structure. Most equipment adopts the form of upper and lower elliptical heads, which has good pressure resistance, no material accumulation, and sanitary dead-angle-free characteristics. Stirring is mostly upper mechanical stirring, and some use lower magnetic stirring. Upper mechanical stirring generally includes paddle stirring, anchor stirring, frame stirring, screw stirring, etc., with relatively low rotation speeds, mostly 10 to 243 r/min. Of course, the rotation speed of upper emulsifying stirring can reach 960 r/min, 1440 r/min, 2900 r/min, which can be fixed-speed or adjustable-speed.
The jacket generally adopts a universal standard hollow jacket, which has a large heat exchange area, is simple to manufacture, and is suitable for normal pressure or medium-low pressure containers. Compared with honeycomb plate jackets, it saves time, but honeycomb jackets have good pressure resistance. The half-pipe jacket thin solution tank can withstand pressure, and although slightly more difficult to process, it is not a pressure vessel and can bear pressure. For small and medium-sized enterprises that want to manufacture pressure-resistant tanks, honeycomb jackets or half-pipe jackets can be used. Of course, if enterprises must manufacture according to standard pressure vessels, standard hollow jackets are mostly used.
The pressure inside the thin solution tank and the pressure of the jacket determine the wall thickness of the tank. The greater the pressure, the thicker the tank wall and the higher the cost. Generally, pharmaceutical factories mostly use steam heating, which mostly belongs to pressure vessels. However, using half-pipe jackets or honeycomb plate jackets does not belong to pressure vessels.
