Development of a Laboratory-Scale Reciprocating Plate Extraction Column

Abstract

ConclusionsDesign equations which are similar t o those for Newtonian fluids have been developed for low Reynolds number heat transfer for pseudoplastic and Bingham plastic fluids. The correlation method is based on methods used for correlating rates of viscous dissipation of energy in non-Newtonian fluids. The variation in heat transfer coefficient with impellervessel wall clearance was investigated. The data obtained show a minimum in the heat transfer coefficient with wall clearance and indicate a n optimum clearance to tank diameter ratio to be greater than 0.06. Scale-up relationships for heat transfer to both pseudoplastic and Bingham plastic fluids have been derived for two common design criteria. AcknowledgmentThe statistical analysis of the data was facilitated by the provision of computer time by the Nomenclature a = exponent on Reynolds number, Equation 3 A = area for heat transfer, ft2 A , = proportionality constant defined by Equation 5 c = exponent on viscosity ratio number, Equation 3 C = constant defined by Equation 3 C l = clearance between impeller and wall, ft C, = heat capacity a t constant pressure, Btu/lb OF 1 = full-scale model 2 = prototype literature Cited effective viscosity, defined by Equation 4, lb, see ft Calderbank, P. H., Moo-Young, M. B., Trans. Inst. Chem. Eng.,

Amplification of the scale‐up procedure for the reciprocating plate extraction column

“…The scale-up procedure for the reciprocating plate extraction column is based on performance data obtained in 25,76,305 and 914 mm dia. columns by Lo and Karr (1972), Karr (1959), and- Lo (1971, 1976), respectively.…”

“…Data on the mass transfer performance characteristics of the reciprocating plate extraction column have been reported by Karr (1959Karr ( ,1980, Lo (1971,1976), Lo and Karr (1972), and Sharma and Baird (1978). These papers show that in small diameter columns, 50 to 150 mm, the lowest value of HETS occurs close to the flood point for low interfacial tension systems.…”

Computer control of holdup in a reciprocating plate extraction column

“…The advantages of the Karr column, now in industrial use in diameters up to I m., are its high capacity/volume ratio, ease of scaleup and the relatively large free area of the plates. Mass transfer studies of the Karr column (Lo and Karr, 1972) have shown that the H.E.T.S. generally decreases monotonically with agitation level until the flooding point is reached; although certain organic systems give a minimum H.E.T.S.…”

A Novel Open Ended Liquid Liquid Extraction Module For The Chemical Engineering Laboratory

“…The equipment that is primarily used in this new module consists of a pilot scale reciprocating liquid-liquid extraction column (Karr Column). [19] The column had been previously used to perform extraction experiments involving solutes in organic and aqueous phases. The original module was a good representation of a real unit operation in a pilot scale.…”