Acrolein (or propenal) is the simplest unsaturated aldehyde. It is a colorless liquid and is mainly used as a biocide or as a building block to other chemical compounds. It is produced industrially from propylene. In the end step of processing, acrolein is separated from water and other residual components by distillation. A simpli? ed process diagram is shown in Figure1. Measurement of both the water and acetaldehyde concentra- tion in th

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