Calculate the total solution per day charged to the whole unit and the barrels of solvent lost per day (in bottoms from last column of each bank).
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A solvent dewaxing unit in an oil refinery is separating 5000 bbl/day of a lubricating distillate into 23 vol percent of slack wax and 77 vol percent of dewaxed oil. The charge is mixed with solvent, chilled, and filtered into wax and oil solution streams. The solvent is then removed from the two streams by two banks of stripping columns, the bottoms from each column in a bank being charged to the next column in the bank. The oil bank consists of four columns, and the wax bank of three. A test on the charge and bottoms from each column gave the following results:
percent solvent by volume
to 1st column
no. 1 bottoms
no. 2 bottoms
no. 3 bottoms
no. 4 bottoms
Pressed Oil
83
70
27
4.0
0.8
Wax
83
71
23
0.5
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Calculate the total solution per day charged to the whole unit and the barrels of solvent lost per day (in bottoms from last column of each bank).
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