CONTINUOUS GRAVITY DECANTER By: DIMPLE PATEL (130990105031) Faculty: Krunal J. Suthar Department of Chemical Engineering Shroff S. R. Rotary Institute of Chemical Technology Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO CONTENTS Principle of decanter Immiscible liquids Continuous gravity decanter Derivation of equation Use of decanter in industry 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO PRINCIPLE OF DECANTER Decanters used for the separation of two immiscible liquids of differing densities from one another. The working principle of decanters is based on sedimentation or settling process. Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO IMMISCIBLE LIQUIDS Immiscible is the property where two substances are not capable of combining to from mixture. Example.. Oil and water Water and alcohol 5/16/2018 Active Learning Assignment SRICT/CE/FFO

CONTINUOUS GRAVITY DECANTER A continuous gravity decanter is used for the continuous separation of two immiscible liquids when the difference between densities of the two liquids is large. 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO Continue… The feed mixture enters at one end of the separator, the two liquids flow slowly through the vessel separate into two layers, and discharge through overflow lines at the other end of the separator. 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO Continue… Provided the overflow lines are so large that frictional resistance to the flow of the liquids is negligible. The performance of the decanter can be analyzed by principle of fluid statics. 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO Continue… Let the other densities of the heavy and light liquids be and respectively. Let the interface between two liquids is at a height . from the bottom of the vessel. The total depth of the liquid of the vessel is and the depth of the layer of the light liquid is . 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO Continue… The overflow of the light liquid is at a height . and the heavy liquid is at a height from the bottom of the vessel. Assume that the overflow lines and the vessel itself are open to the atmosphere through a vent line. 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO Derivation of equation A hydrostatic balance gives, Where, =depth of the light liquid =interface between two liquids =height of the overflow light liquid =total depth of the liquid 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO Continue… -----(1) -----(2) -----(3) -----(4) 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO Continue… Substituting for from equation (4) into (2), Collecting the terms, we get 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO Continue… The above equation shows that the position of the interface between the layers in the separator depends on the elevation of the 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO USE OF DECANTER IN INDUSTRY Sugar industry Wine industry Pharmaceutical industry Food industry 5/16/2018 Active Learning Assignment SRICT/CE/FFO

Active Learning Assignment SRICT/CE/FFO Thank you Active Learning Assignment SRICT/CE/FFO