7.0 RESULTS
7.0 RESULTS
TIME (min)R1 (mS)R2 (mS)R3 (mS)
00.1640.1700.172
312.1508.9203.280
67.8009.2505.290
95.1106.9806.670
123.4505.6307.040
152.3504.0806.880
181.4293.1606.060
211.0002.3805.290
240.7201.7874.490
270.5261.3003.700
300.4000.9712.910
330.3100.7412.310
360.2580.5731.817
390.2270.4581.427
420.2060.3701.138
450.1930.3060.902
480.1830.2590.704
510.1770.2290.555
540.1730.2070.438
570.1690.1980.363
600.1690.1870.310
630.1680.1870.264
660.1660.1810.235
690.1660.1770.212
Figure 7.1: Graph of conductivity of fluid versus time
8.0 DISCUSSION
The objective in this experiment is to determine the effect of
pulse input to the concentration in CSTR reactor. Based on the
Figure 7.1, the graph of conductivity versus time was plotted. The
value of conductivity was recorded in each 3 minutes time
intervals.
In each reactor in series in pulse input, the concentration was
increased by function of time. Then, it achieved peak concentration
at certain time interval before dropped to concentration=0. It can
be seen through the graph in Figure 7.1 which first reactor
achieved steeper concentration curve rather than the second and
third reactor. This is because the diluted sodium chloride enters
the reactor 1 first and then reactor 2, 3 bypass with deionised
water containing deionised water flow into the reactors. Thus, lead
the concentration of sodium chloride decreased as the deionised
water was not fully removed during the flow.
Residence time-distribution function is used to describe on how
much feed have spent in the reactor (Fogler, 2006). Yet in this
experiment, it only used to describe how much degree of
concentration response to pulse input CSTRs in series. As time
increased, concentration of three reactors almost same which is
0.166 (mS/cm), 0.177 (mS/cm) and 0.212 (mS/cm) respectively for
reactor 1, 2 and 3 after 69 minutes.
Due to graph, the inlet concentration of three reactors may
different because of the flow rate that not constant at 150mL/min.
The reading of conductivity at the final minutes cannot be same as
the entering sodium chloride due to the fixed volume used in tank
which is 20L. If the volume used is more than 20L, the final value
of conductivity for all three reactors may get as same as the
initial one which is 0.164 (mS/cm) for reactor 1, 0.170 (mS/cm) for
reactor 2 and 0.172 (mS/cm) for reactor 3.
REFERENCE
- H. Scott Fogler (2006), Chemical Reaction Engineering, Fourth
Edition Pearson International Edition, Pearson Education Inc.
- Solteq Engineering (2013), Equipment for Education and
Research, Continuous Stirred Tanks Reactor
