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Fouling of a plate heat exchanger used in ultra high temperature sterilization of milk


Fouling of a plate heat exchanger used in ultra high temperature sterilization of milk



Journal of Dairy Research 51(4): 557-568



ISSN/ISBN: 0022-0299

DOI: 10.1017/s0022029900032878

The composition and weight of deposit formed in all sections of an ultra-high-temperature milk sterilization plant were determined. Deposits formed in the preheating, heating and cooling sections during sterilization of pasteurized whole milk were analyzed for dry matter, protein, fat and mineral contents. The weight and composition of components of the deposit varied in different sections of the plant and with the heating temperature. Two categories of deposit could be distinguished: one in the preheating section consisting of (wt/wt) protein 50%, minerals 40% and fat 1% and another in the heating section consisting of minerals 75%, protein 15% and fat 3%. Concerning the rate of formation of these deposits, a comparison of the results with those obtained for pasteurization shows that fouling was more rapid during pasteurization of raw milk than during sterilization of previously pasteurized milk. Hypotheses concerning mechanisms of formation of protein deposition are discussed.

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Accession: 005482719

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