The acetification process needs an overall study of the variables influencing it in order to establish theiroptimum values. Based on industrial experience and available literature, including a recently proposed model by the authors,among the variables most strongly influencing the acetification process are the ethanol concentration at the time the reactor isunloaded, the unloaded volume and the loading rate. To ensure economically efficient industrial production of vinegar, and tocheck the predictions of the aforementioned model, the influence of the final ethanol concentration at unloading time on themean acetification rate and on productivity has been studied in this work.