UFC 3-240-13FN
25 May 2005
Table 3-4. Physical and Chemical Properties of Neutralizing Amines
Property
Morpholine
DEAE
Cyclohexylamine
Boiling point
129 oC
163 oC
134 oC
(100% amine)
(264 oF)
(325 oF)
(273 oF)
Boiling point (amines/water
99 oC
96 oC
--
azeotrope)
(210 oF)
(205 oF)
Decomposition temperature
340 oC
423 oC
330 oC
(644 oF)
(794 oF)
(626 oF)
Vapor-liquid distribution ratio
0.4
1.7
4.7
Specific gravity
1.002
0.88
0.86
(100% amine)
pH, 100 ppm solution
9.7
10.3
10.7
Amount of amine required to
maintain pH of 8.0 in water
37 ppm
22 ppm
15 ppm
containing 10 ppm CO2
Amines have different vapor-liquid distribution ratios and will not work equally
well in all systems. Depending on the particular amine, it can be effective in short-,
medium-, or long-distance condensate lines. In complex condensate return systems,
optimum results are obtained by choosing the appropriate amine or combination of
amines on a system-by-system basis. A neutralizing amine selection chart is provided in
Table 3-5. Often blends of different amines are used.
Table 3-5. Neutralizing Amine Selection Chart
High-Pressure Systems
Low
(above 103 KPa [15 psig])
Pressure
Short
Medium
Long
Amine
(below 103
System
System
System
KPa
< 243 m
< 1.61 km
> 1.61 km
[15 psig])
(< 800 ft)(2)
(< 1 mile)(2)
(> 1 mile)(2)
Morpholine
X
DEAE
X
X
X
Cyclohexylamine (1)
X
Cyclohexylamine/
X
X
morpholine mixture
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