Page 118 - Gas Purification 5E
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108 Gas Pz4niJication
90
80
70
60
50
40
30
20
10
0
-1 0
-20
-30
-40
-50
0 20 40 60 80
Amine weight percent
Figure 2-78, . Freezing points of aqueous solutions of MEA, DEA, DGA, DIPA, MDE 3, and
TEA. (GPa, 1994
(text contirzuedfronz page 103)
design approaches are employed depending on the type of gas treating application and the
precision desired. Approaches used for predicting the required solution flow rate and estab-
lishing basic equipment design parameters can be categorized as follows:
1. Rule of Thumb Designs: This approach works surprisingly well for applications similar to
existing operating systems. A typical MEA plant, for example, can be designed on the
basis of an assumed net solution loading (e.g., 0.33 moles of acid gas per mole of amine),
and an assumed steam consumption (e.g., 1 lb of steam per gallon of solution circulated)
based entirely on experience correlations. Another rule of thumb is that about 20 sieve trays
