Information Technology Reference
In-Depth Information
ETAZL
ETAZH
B1
B2
CRUDETOH
ETH
TOLSTILL
ETAQ
TOL
SOLVNTS
DECANT
CRUDTOL
AQTOL
CRUDSTL
FD1
FD2
RSLVNT
STMSTRIP
FD3
CRSOLIDS
AQSLVNT
WATER
FILTER
SOLIDS
Figure 4.6
Distillation train.
composition is to be 99% water. All of the toluene fed ends up in the stream ETAQ.
The stream ETAZH feeds the column ESTILLLO. This column produces the relatively
pure product ETH, which is to contain 99 mol % ethanol, and the product ETAZL,
which is to contain 82 mol % ethanol. The stream ETAZL is recycled to column
ESTILLHI.
A steam stripper (STMSTRIP) is provided to remove solvents from the aqueous
products of the process, ETAQ and AQSLVNT. The stream FD3 consists of 50 lb/hr
of 30-psig steam that is used as the energy source for the stripping the solvents. The
stripper produces the stream RSLVNT, which contains the stripped solvents and is
recycled to the column CRUDSTL. The stream WATER is discharged to the envi-
ronment. The performance characteristics of the stripper are as follows: 0.5% of the
ethanol fed, 90% of the water fed, and 0.01% of the toluene fed end up in the stream
WATER.
a. There is no component SOLIDS. Devise a method that will permit this component
to be used in the simulation.
b. To calculate the material balance for the complete process flow sheet, it may
be advisable to break up the process into manageable segments that are to be
combined when the complete material balance is solved. Select the segments and
solve each using an estimate for the required feeds when necessary.
