791. 遠心薄膜乾燥機の粉末化性能,(II)

懸濁液の乾燥粉末化

抄録

Powdering characteristics of a thin film dryer are studied experimentally and theoretically for dryer application to solutions and suspensions. In a previous paper a powdering model for solutions was proposed and fairly good agreement was obtained between calculated and experimental results with Na₂SO₄ solution. In this paper, the powdering model is improved to apply to suspensions and mixtures of solution and suspension. Ion exchange resin and filter aid are selected as examples of suspensions, and Na₂SO₄ of solution. The critical condition for the powdering process is expressed by a theoretical equation derieved from experiments. The calculated results of the improved model agree well With experimental values. It is found that kinematic viscosity is the most important physical property in the powdering Process and the kinematic viscosity of the mixture can be evaluated as the weighted average of its component kinematic viscosities. An automatic oontrol system, which was applied to the results of the powdering model, was designed and successfully demonstrated.