By David Johns
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Extra resources for A beginner's guide to Forth
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.