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Extra resources for A beginner's guide to Forth

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Figure 2 Reaction process mass balance problem final contents after combustion) and the species involved. The key is E for ethanol, O for oxygen, N for nitrogen, C for carbon dioxide and W for water. (ii) As in the first example, the boxed question marks highlight the variables that need to be determined. As there are five highlighted variables, we will require at least five equations. As there are five species involved, five mass balance equations can be defined. In this case, we should use Equation (1) but with accumulation set to zero to indicate that the tank is empty to start with and also empty at the end.

First of all they can be classified according to their operation, either batch or continuous, with semibatch or semicontinuous being a category between them. A batch reactor has no stream continuously flowing into or out of it and is charged with the reactants in a pure form or in a solution, heated to the reaction temperature and left for the reaction to occur for a specific time. At the end of the reaction the reactor is emptied, cleaned, maintained (if necessary) and then filled with reactants again.

K and KP have no units. The reason for this is that the more rigorous definition for ideal gases is KP ¼  N  Y Pi ni i¼1 P0 ð19Þ where P0 is a standard pressure. Normally P0 ¼ 1 bar so that arithmetically the first equation is valid. It is widely used because of its simplicity. For the gaseous reversible reaction of the example above, Equation (19) can be rewritten as KP ¼ PcC PdD PaA PbB ð20Þ 28 Chapter 2 K or KP can be calculated from the Gibbs free energy of the reaction, DG1R DGRT ¼ ÀRT ln K ð21Þ where R is the universal gas constant.

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