1. Processing
of Soybeans in Three Stages. A feed of
10000 kg of soybeans is processed in sequence of three stages of steps (E1). The
feed contains 35% wt % protein, 27.1 wt % carbohydrate, 9.4 wt % fiber and ash,
10.5 wt % moisture, and 18.0 wt % oil. In the first stages the beans are
crushed and pressed to remove oil, giving an expressed oil stream and a stream
of pressed beans containing 6% oil. Assume no loss of other contituents with
the oil stream. In the second step the pressed beans are extracted with hexane
to produce an extracted meal stream containing 0.5 wt % oil and a hexane-oil
stream. Assume no hexane in the extracted meal. Finally, in the last step the
extracted meal is dried to give a dried meal of 8 wt % moisture. Calculate :
a.
Kg of pressed
beans from the first stage.
b.
Kg of
extracted meal from stage 2.
c.
Kg of final
dried meal and the wt % protein in the dried meal.
JAWABAN
Soybeans
{100 % - 18 % oil on feed} = 0,82 %
{100 % – 6 % oil on Pressed beans} = 0,94 %
{100 % - 0.5 % oil on extracted meal} = 0,995 %
a. Balance
On Meal
0,82 (10.000 kg) =
0,94 P
8.200 Kg = 0,94 P
P = 8200/0,94
=
8723 Kg
Sehingga dapat diketahui Oil
Stream (L kg)
10.000 Kg = L + P
10.000 Kg = L + 8723 Kg
L =
(10.000 – 8723) Kg
=
1277 Kg Oil Stream
b. Balance
On Meal
0,94 (8723 Kg) = 0,995 M
8199,62 Kg = 0,995 M
M = 8199,62/0,995
=
8241 Kg Extracted Meal
Sehingga dapat diketahui
banyaknya oil (Kg oil)
Kg Oil = 0,005 (8241 Kg)
=
41,025 Kg
c. Composition on Meal
Component
|
Kg
|
Oil
|
41
|
Protein
|
3500
|
Carbohydrate
|
2710
|
Fiber and Ash
|
940
|
H2O
|
1050
|
Total
|
8241 Kg
|
Balance On Meal (Sedikit H2O)
8241 Kg – 1050 Kg = 0,92 D
7191 Kg = 0,92 D
D =
7816 Kg Dried Meal
% Wt = (3500 kg/ 7816 kg) x 100
= 44,85 weight protein
% Wt = (3500 kg/ 7816 kg) x 100
= 44,85 weight protein
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