Page 39 - Plant design and economics for chemical engineers

22 PLANT DESIGN AND ECONOMICS FOR CHEMICAL ENGINEERS

Basis: One operatrng day
Unit designed to produce 153,500 kilograms of
61 weight percent nitric acid per day
Row moteriols Processing Products

Converter
Yields
45,000 kg NO
43,000 kg Hz0
26,500 kg O2
2 9 2 , 5 0 0 k g N,
L 1
.
Air
40,000 kg Cooler condensers

To vent or
power recovery

t I
Stack gases
5500 kg O2
Water - 338.000 kg N2
31,000 kg 4 A b s o r p t i o n t o w e r 2~ 1000 kg NO2
25,000 kg HNO,
- 51,000 kg NO2 -
70,000 k g H,O
Air 338.000 kg N2
20,000 k g 14.000 k g 0 , 9 3 , 5 0 0 k g HNO,
60,000 k g H,O
+
To storoge

FIGURE 2-2
Quantitative flow diagram for the manufacture of nitric acid by the ammonia-oxidation process.

ing tables give essential information, such as specifications for purchasing,
specifications for construction, type of fabrication, quantities and types of
chemicals involved, and sample calculations.
Equipment symbols and flow-sheet symbols, particularly for detailed
equipment flow sheets, are given in the Appendix.

THE PRELIMINARY DESIGN
In order to amplify the remarks made earlier in this chapter concerning the
design-project procedure, it is appropriate at this time to lookmore closely at a I
specific preliminary design. Because of space limitations, only a brief presenta-