Читать книгу Introduction to Desalination - Louis Theodore - Страница 56

Consider the manufacture of ammonia from natural gas, which can be considered to be pure methane. In the first stage of the process, natural gas is partially oxidized in the presence of steam to produce a synthesis gas containing hydrogen, nitrogen, and carbon dioxide. The carbon dioxide is removed. The remaining mixture of hydrogen and nitrogen is reacted over a catalyst at high pressure to form ammonia. The two reactions for the process, neglecting side reactions and impurities, are as follows:

Sketch a flow diagram for this process.

Solution. See Figure 3.3 for a simplified process flow diagram for this ammonia manufacturing process.

Figure 3.3 Simplified process flow diagram for Illustrative Example 4.