Lysine is an essential amino acid used in many applications, including animal and human foods and pharmaceuticals.
Question:
Lysine is an essential amino acid used in many applications, including animal and human foods and pharmaceuticals. A sulfonated poly(styrene-divinylbenzene) cation-exchange resin with an 8% degree of cross-linking is used to bind lysine at pH 6 from an aqueous solution at 25°C. At this pH, lysine diffuses in the resin in monovalent cationic form.
The resin particle diameter is 600 μm.
(a) Estimate the diffusivity of lysine in water, , and the ion diffusivity of monovalent lysine cations, ,in this resin.
(b) Estimate the time required to convert the resin particle to80% monovalent lysine form if the resin starts 100% saturated in NH4+ form and is immersed in a large volume of a lysine solution.
(c) Estimate the time required to convert the resin particle to 80% NH4+ form if the resin starts 100% saturated in monovalent lysine in and is immersed in a large volume of a NH4Cl solution.
(d) Repeat the calculation in
(b) and (c)
neglecting electrostatic coupling of diffusion fluxes and assuming that the effective diffusivity is a constant equal to . The ion diffusivity of NH4+
in this resin has been reported to be = 0.18 × 10-7 cm2/s.
Step by Step Answer:
Heat And Mass Transfer For Chemical Engineers Principles And Applications
ISBN: 9781264266678
1st Edition
Authors: Giorgio Carta