Chap 2: corn wet milling Flashcards
1
Q
3 possible main product
A
- ethanol
- starch
- sweeteners
2
Q
3 coproducts
A
- corn oil
- gluten feed (ruminant)
- gluten meal (poultry food)
3
Q
7 steps
A
- reception and cleaning
- steeping
- germ recovery
- fiber recovery
- gluten (protein) recovery
- starch washing
- coproduct manufacture
4
Q
aim of reception and cleaning
A
REMOVE BROKEN CORN AND FOREIGN MATERIAL
5
Q
aim of steeping
A
mix corn in hot water with dilute SO2 to remove glutelins mainly
6
Q
3 steeping step
A
- lactic acid dominated stage
- SO2 diffusion
- SO2 dominated
7
Q
what happen to sucrose during steeping
A
sucrose is eaten by bacteries to form lactic acid
8
Q
equipment for germ separation and principle
A
hydro cyclone using density difference
9
Q
equipment for fiber washing
A
pressure feed screen
10
Q
equipment for starch-gluten separation
A
primary centrifuge separates starch from gluten (density difference-protein on the top and starch on the bottom)
11
Q
water path through the process
A
water comes in the end, moves through the process and finishes in the steep tank, then it is evaporated and mix to obtain gluten feed
