Page 174 - Elements of Chemical Reaction Engineering 3rd Edition

1 46 Isothermal Reactor Design Chap. 4

vo = 15.34 rt3mn I
Conversion in the (7.67
series arrangement
is greater than in
parallel for CSTRs.
From our discus-
sion of reactor stag-
ing in Chapter 2, we
could have predicted
that the series x2=o.90
arrangement would XI ~0.68
have given the
higher conversion.
Figure E4-2.3 CSTRs in series.

Two equal-sized CSTRs in series will give a higher conversion than two
CSTRs in parallel of the same size when the reaction order is greater than zero.
We can find information about the safety of ethylene glycol and other
chemicals from the World Wide Web (WWW) (Table 4-4). One source is the
Vermont Safety information on the Internet (Vermont SIRI). For example, we
can learn from the Control Measures that we should use neoprene gloves when
handling the material, and that we should avoid breathing the vapors. If we

TABLE 4-4. ACCESSING SAFETY IWFORMATION
1. Type in
http:llwww.siii.orgl
2. When the first screen appears, click on “Material Safety Data Sheets.” (“MSDS”)
3. When the next page appears, type in the chemical you want to find.
Safety Information Example: Find
MSDS Then click on Enter.
4. The next page will show a list of a number of companies that provide the data on ethylene
glycol.
EXCITON CHEMICAL
KALAMA INTERNATIONAL.
DOW CHEMICAL USA
etc.
Let’s click on “EXCITON.” The materials safety data sheet provided by EXCITON will
appear.
5. Scroll “ethylene glycol” for information you desire.
General Information
Ingredients Information
PhysicalKhemical Characteristics
Fire and Explosion Hazard Data
Reactivity Data
Health Hazard Dpta
Control Measures
Transporration Data
Disposal Data
Label Data