Defoantit

Defoantit is a generic term used to describe a class of defoaming and antifoaming additives designed to control foam in liquid-processing systems. It encompasses silicone- and hydrocarbon-based blends, often sold as proprietary formulations by chemical suppliers. Defoantits function by migrating to the air-liquid interface of bubbles, reducing surface tension and destabilizing thin liquid films, which accelerates bubble coalescence and breakage.

Common forms include silicone oil emulsions, fluorinated compounds, and mineral oil–based blends; they are typically added in small amounts through metering pumps or batch dosing, and are selected based on process temperature, pH, and the presence of particulates or surfactants.

Applications span fermentation and bioprocessing, wastewater and sludge treatment, pulp and paper, paint and coatings, food and beverage processing, and petrochemical operations. In brewing and dairy, defoantits help manage foaming during fermentation and filtration; in industrial settings they reduce overflow, improve sensor readings, and aid in downstream separation.

Handling considerations include following the product SDS, avoiding contamination of food-contact surfaces where not approved, and preventing environmental release. Defoantits are typically designed to be low-foam and low-odor, and many are compatible with stainless steel equipment and standard cleaning-in-place routines.

Development of defoantits dates to mid-20th century with silicone-based products gaining prominence; today many suppliers offer a range of formulations tailored to specific industries, with performance data provided in technical sheets and test methods such as fouling resistance and foam height reduction.