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QUESTION 3 The effluent gas from a refinery of composition is fed into an absorber to reduce the n-C4H10 content of the effluent before recycling. The absorber is operated at 323K and 750 kPa. The entering oil and gas with its composition is shown in the following table. The absorber has 7 theoretical stages. It can be assumed that: i) A and S values can be based on the entering values of L and V. ii) K-values are constant and estimated at an average of the entering and exiting temperatures as provided in Table 1 below.. Table 1: The entering oil and gas with its composition Lo, kmol/h V7, kmol/h K CH4 345 5.35 C2H6 206 2.30 C3H8 234 1.25 n-C4H10 0,65 65 0.0812 OIL 164,5 0.0001 3.1. Calculate the compositions and flowrates of the vapour (V1) and liquid (L8) streams leaving the absorber. Tabulate your answers in an appropriate table. (16)

          QUESTION 3
The effluent gas from a refinery of composition is fed into an absorber to reduce the
n-C4H10 content of the effluent before recycling. The absorber is operated at 323K and
750 kPa. The entering oil and gas with its composition is shown in the following table.
The absorber has 7 theoretical stages. It can be assumed that:
i) A and S values can be based on the entering values of L and V.
ii) K-values are constant and estimated at an average of the entering and
exiting temperatures as provided in Table 1 below..
Table 1: The entering oil and gas with its composition
Lo, kmol/h V7, kmol/h K
CH4 345 5.35
C2H6 206 2.30
C3H8 234 1.25
n-C4H10 0,65 65 0.0812
OIL 164,5 0.0001
3.1. Calculate the compositions and flowrates of the vapour (V1) and liquid (L8)
streams leaving the absorber. Tabulate your answers in an appropriate
table.
(16)

QUESTION 3
The effluent gas from a refinery of composition is fed into an absorber to reduce the
n-C4H10 content of the effluent before recycling. The absorber is operated at 323K and
750 kPa. The entering oil and gas with its composition is shown in the following table.
The absorber has 7 theoretical stages. It can be assumed that:
i) A and S values can be based on the entering values of L and V.
ii) K-values are constant and estimated at an average of the entering and
exiting temperatures as provided in Table 1 below..
Table 1: The entering oil and gas with its composition
Lo, kmol/h V7, kmol/h K
CH4 345 5.35
C2H6 206 2.30
C3H8 234 1.25
n-C4H10 0,65 65 0.0812
OIL 164,5 0.0001
3.1. Calculate the compositions and flowrates of the vapour (V1) and liquid (L8)
streams leaving the absorber. Tabulate your answers in an appropriate
table.
(16)

Added by Pamela A.

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