| Abstract: Within the framework of a project, extending over several years, it was possible to reduce the consumption of antifoaming agents at the Agrana plants to less than 50 %. With the employment of special foam probes, on which bridging was avoided by rinsing with vapor condensate, the addition of antifoaming agents in juice purification was adapted to the real demand. In vessels with little turbulences, foam layers were destroyed by juice circulation through hollow-cone nozzles and additional probe dependent dosing of foaming agent. To control the extraction process, raw juice was aerated in a flow through vessel and antifoam agent was added, dependent on foam development in the vessel, for trial purposes. For the assessment of different defoaming formulations, beet juice, obtained by continuous pressing of heated sliced beet and such virtually free of defoamers, was frothed up under controlled conditions and titrated with thinned defoamer to a constand residual foam level.
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