Wheat is grown all over the world for its highly nutritious and useful grain. Wheat is one of the top three most produced crops in the world, along with corn and rice.
Vital Wheat Gluten
Gluten is particularly important in the manufacture of starch from wheat; gluten is a very valuable by-product representing half the turnover. In fact the starch is by some manufacturers considered the by-product and gluten the main product.
If gluten is extracted and gently dried in hot air at moderate temperatures it maintains its vitality. “Vital wheat gluten” may be added as a dry powder to flour otherwise low in protein and thereby improve the baking qualities of the flour.
Dedert's Ring Dryers with their gentle drying and short residence time are ideal for drying gluten.
A and B Starch
The difference between A and B starch is not only the size of the granules but their water content.
A starch is made up of mostly large granules, 25-35 um, with low protein content.
B Starch has smaller particles, 2-8 um, with a higher protein content. The smaller granules have more surface area and therefore bind more water to them than the larger A granules.
C Starch or Wheat Effluent
After the A and B Starch is separated from the wheat slurry, C Starch remains. This is a mixture of starch and proteins.
A and B Starch Drying
A and B Starch derived from wheat processing can be dried on Dedert's specially designed Flash Dryers.
A Starch is usually dried on a single pass Flash Dryer with specifically designed feed components. Bag-house collection is preferred due to the particle size distribution, however progress has been made with cyclone collection combined with pneumatic discharge.
B Starch is usually dried on Ring Dryers. Slurry is fed at 35% moisture content and the final product is dried to 10-12% final moisture. Bag-filter collection is preferred to cyclone collection due to the particle size distribution.
C Starch or Effluent Evaporation
C Starch is normally concentrated in an evaporator using Dryer Gas or Electricity (Mechanical Vapor Recompression) as a heating source. Typically the product is concentrated to 30% DS.
With the High Shear Dedert Spray Distribution System, it is feasible to concentrate to 30% DS with Falling Film at lower temperatures. Falling Film is a more economical option requiring a lower CAPEX and significantly less power.
For more detail on Dedert Dryers and Evaporators for the wheat industry, please see our Technologies pages.