Desolventizer and Toaster - DT

TECNAL´s DTs or DTDCs have the latest design and the most modern operating technology that provide very efficient desolventization at low steam consumption.

The feeding is performed by a rotary valve with rotor made of stainless steel. In the pre-desolventizing stage the passage of material from one floor to another occurs through open fixed spouts; in the desolventizing stage the passage of material if done by fix spouts with hinged covers or by rotary valves. The final discharge is done by a rotary valve.

Pre-desolventizing stage is comprised of floors where the gases pass through the side wall of the DT. Meats are constantly mixed by knives and blades. The floors are specially perforated and promote an efficient solvent evaporation. Solvent vapors get down through such holes and avoid the formation of an isolating gas-type layer in the bottom. This way, the contact meat/bottom is constant, with excellent results.

The pre-desolventizing stage helps to improves the desolventization with less steam consumption. This reduction is quite expressive in the total installation consumption when comparing with the values of a plant with a conventional DT without pre-desolventizing floors. Therefore, it is easier to control the quality of the meat, mainly the urease activity and the protein solubility. This way, the treatment of proteins in the meat becomes more careful and keeps the maximum percentage of albuminous substances soluble in water.

Desolventizing/Toasting stage is comprised of floors with mixer knives and blades. Direct steam is injected in the double-effect floor and the gases arise through the grates of the floors, which are specially perforated for this purpose. This way, the fluidity of the material becomes very much expressive, which results in an efficient desolventization process with low steam consumption and low required power per ton of material.

The last floor of the DT is called "flash floor" which has the purpose to remove all remaining traces of solvent from the meal. Solvent and steam are aspirated with sjectors and sent to the scrubber, this way you assure a very low solvent content in the meal.

Final discharge is done by a rotary valve. A level transmitter and a PLC control the speed of this valve in order to keep the right level of material at each floor.

At the end you will have a low steam consumption, less solvent in the meal and less solvent loss

  • Electronic automation (PLC) to control:
    - Flow and meal levels;
    - Steam injection;
    - Gases temperature;
    - Electric current of the main motor (amperage)
  • Flow controllers and discharge valve with special design in order to make the residence time uniform.


Capacities: up to 6,000 t/24h.