Aspen Plus blocks separator

Note that the Calculate text box must be in the strict FORTRAN format, which for our purposes means that we must insert six spaces before each line. When finished (and the blue checkbox appears in the Calculate tab to indicate that there were no syntax errors), verify that the Sequence tab will execute the calculator block use (ing) import/export variables. This means that Aspen Plus will call this calculator block at some point in the SM sequence when all of the import variables are available, but the export variables still need to be calculated. For this example, this occurs precisely after MIXl and before MIX2. A savvy user could control this manually by specifying that it should execute before MIX2, but the default setting is usually adequate. When finished, run the simulation and verify that the makeup content has changed (it should be about 7.6 kmol/h H2O and about 0.001 kmol/h MDEA). At this point, saving a backup copy of the simulation in a separate file is recommended. 

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