| Author | Acda, Reynaldo I. |
| Call Number | AIT Diss. no. ET-90-2 |
| Subject(s) | Alcohol
Distillation
|
| Note | A Dissertation submitted to the Di vision of Energy Technology,
Asian Institute of Technology in partial fulfillment of the
requirements for the degree of Doctor in Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The first part of t h is study introduced the concept of
potentiality as a criterion for assessing the performance of the
cuprophan hollow fiber membrane module for ethanol - water
pervaporation. Potentiality was developed thru the congruous
adaptation of a n analogy with availability (or exergy ) from
thermodynamics. This parameter is the combination of quantity a nd
quality, specifically global flux density a nd selectivity factor.
Since generally the global flux density is inversely related to
the selectivity, the potentiality is a useful tool in finding the
compromise condition where the flux and the selectivity are both
acceptable.
An equation was developed to describe the relation ship of
potentiality with liquid phase composition. The equation in
conjunction with the material balance for a flow recycle
pervaporation process was utilized to define the operating
condition s of the process. At fixed values of liquid feed rate
a nd composition, t h e most suitable liquid product composition and
membrane area requirement can be obtained from the established
model.
The u se of potentiality thru its maximum value permits us
to determine a theoretical minimum membrane surface area for a
given separation. This estimation technique appears to be
appropriate and convenient in a prefeasibility study for coupling
pervaporation with distillation . The determination of the
capital and energy requirements of the distillation-pervaporation
process can begin with the base figure of the membrane area
provided by the maximum potentiality criterion.
Air perstripping sing the cuprophan ho low fiber module
was a l so studied to determine the behavior an d mass transport
characteristics of the process. The effects of the liquid phase
composition, temperature and the relative humidity of the sweep
air stream on the selectivity and the fluxes of ethanol a nd water
were evaluated . The behavior of the process was also analyzed in
relation to the conventional vacuum operated pervaporation
process. Pervaporation of ethanol - water solutions through
cuprophan hollow fibers using air perstripping is feasible but
limited to some compositions of the liquid feed. The limitation
is dictated by the water content of the inlet air.
Air perstripping is referred to an equilibrium stage
operation different from that of vacuum operated pervaporation
which is highly kinetic. The mass transport model developed to
describe the process was based on the partial pressure departure
from equilibrium of t h e liquid and gas phases. Th e formulated
model can be used as t h e simulation equation for the design of
this kind of pervaporator. |
| Year | 1990 |
| Type | Dissertation |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Mora, Jean-Claude
|
| Examination Committee(s) | Prida Wibulswas ;Bhattacharya, Sribas C. ;Tabucanon, Mario T. ;Vigneswaran, Saravanamuthu
|
| Scholarship Donor(s) | Government of Australia |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 1990 |
