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( 2 0 % ) A gaseous waste stream is generated within a plastic film processing operation from a drying step. The stream ( 1
A gaseous waste stream is generated within a plastic film
processing operation from a drying step. The stream
is currently being vented to the atmosphere and it contains vol.
of total VOCs of equal amount of toluene and ethyl acetate. An
absorption column and a distillation column are proposed to recover
the toluene and ethyl acetate. In the absorption tower, tetradecane is
used as the absorption oil. and are emitted
from reboilers burning # heating oil. The recovery efficiency can
be improved by increasing the flow rate of absorption oil flow rate
ie ntetradeane flow rate which however, will increase the
energy requirement, leading to higher combustion emissions. A
waste audit based on process flowsheet estimates all pollutant
emission rates from the process as shown in Table for the base
case without solvent recovery, the case with toluene recovery,
and the case with reduction of both toluene and ethyl acetate.
a Calculate the percentage reduction in overall global
warming impacts of the waste streams from this process for the
proposed options over one year period days in operation
Assuming all hydrocarbons are oxidized to after their
releases, using IPCCear
b Calculate the percentage reductions in noncarcinogenic
risks for both proposed options based on CHEMINFO web.
Assuming an intake fraction iF of ie and
the workers exposed to the polluted air over their hour work
shift each day.
Table Air emission rates of chemicals from a solvent recovery
process.
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