The tank consists of four parts---can body, condenser, gas-liquid seperator and liquid receiving barrel. It is available to concentrate and distil the material liquid in such industries as pharmacy, food, chemistry and recycle the organic menstruum. The adoption of reduced pressure concentration shortens the time for concentration, avoiding destruction to effective components inside the thermal sensitive material. The contact part of the concentrator is made of stainless steel, resistant to corrosion and high durable, meeting the standard of GMP.