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Conversion and its related terms yield and selectivity are important terms in chemical reaction engineering. They are described as ratios of how much of a reactant has reacted (''X'' — conversion, normally between zero and one), how much of a desired product was formed (''Y'' — yield, normally also between zero and one) and how much desired product was formed in ratio to the undesired product(s) (''S'' — selectivity). There are conflicting definitions in the literature for selectivity and yield, so each author's intended definition should be verified. Conversion can be defined for (semi-)batch and continuous reactors and as instantaneous and overall conversion. == Assumptions == The following assumptions are made: * The following chemical reaction takes place: :, where and are the stoichiometric coefficients. For multiple parallel reactions, the definitions can also be applied, either per reaction or using the limiting reaction. * Batch reaction assumes all reactants are added at the beginning. * Semi-Batch reaction assumes some reactants are added at the beginning, the rest is fed during the batch. * Continuous reaction assumes reactants are fed and products leave the reactor continuously and in steady state. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Conversion (chemistry)」の詳細全文を読む スポンサード リンク
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