ENA, fuel and medical ethanol: specify the difference

For ENA, we align fermentation and refining with methanol, aldehyde, ester and higher-alcohol limits, together with odor and taste requirements. Hydroselection and impurity withdrawal perform different duties from simple concentration.

For anhydrous fuel ethanol, molecular sieves remove water after distillation; they do not replace upstream impurity separation. Medical ethanol also needs an agreed pharmacopoeial or purchaser specification, traceable sampling and appropriate product-contact materials. A dehydration unit alone does not establish medical quality.

For a flexible plant, define the hydrous product take-off, dehydration allocation, storage segregation and changeover procedure. Acceptance should state concentration basis, temperature, analytical method and sample location. The same headline purity can conceal different product specifications.