Plant Processing of Crops:
Plant proteins, oil, starch and fibres are an important source of ingredients
for both non-food and food applications. Processing yields, product portfolio
and product characteristics are the key issues in the development of isolation
processes for crops. For instants, seed-specific constituents, like phytic
acid in rapeseed, have to be evaluated regarding their impacts during
protein isolation and byproduct separation (fibre).
Figure 1 shows a processing scheme for rapeseed protein that have been
evaluated regarding processing yields and product characteristics.
Figure 1: Rapeseed process
Pilot Plant Equipment (Figure 2)
The Fraunhofer Pilot Plant is designed as a modular concept to cover all
aqueous and aqueous-alcoholic processing steps in protein isolation, protein
concentration and protein modification. The processing includes separation
steps and various possibilities to dry proteins, starch and fibres.
The processes can be operated in both continuous operation mode (max.
50 kg/h seed) and batchwise operation mode (up to 200 kg per batch). The
plant is controlled and operated by a SPS system.
- 4-stage counter-current
- centrifugal decanters
and separators (throughput up to 10 m³/h)
- 2-stage extraction
cross-flow and protein precipitation
- cross flow ultrafiltration
plant (separation area 10 m², throughput up to 10 m³/h) (Figure
- ring drying plant
(up to 100 kg/h water evaporation) for dietary fibre und starch (Figure
- spray drying plant
with internal and external fluid bed (up to 40 kg/h water evaporation)
for protein isolates (Figure 5)
Figure 2: Pilot plant for protein isolation
Figure 3: Cross flow ultrafiltration plant
Figure 4: Pilot plant, ring dryer
Figure 5: Pilot plant, 3-stage spray dryer
Evaluation of the Processes and Products
Process trials in pilot plant scale in conjunction with our analytical possibilities
are the basis for the calculation of mass balances.
For example, the processing characteristics for the protein isolation of
rapeseed, lupins and soybeans are compared in Table 1.
Table 1: Protein
yields in protein isolation
| Yield of Protein1)
|| Rapeseed Process
|| Lupin Process
|| Soybean Process2)
| Dietary Fibre
|| Fraction 1:
Fraction 2: 40 %
1) On percentage
of raw protein
2) Literature: E. Bernardini: Oilseeds, Oils and Fats, Volume 1, Publishing
Our analytical and
product laboratories are equipped to determine compositions, functional
and properties of physical products.
This wide range of pilot plants and laboratory equipment makes it possible
to assess the processes and to characterise, compare and evaluate the
The results of such
a evaluation can serve as a basis for process development and can be also
used in the market preparation phase.