Diluted skim milk with a protein concentration of 4.3 g/L is to undergoDEF microfiltration. Experiments have been performed using a cellulose-acetate membrane with an average pore diameter of 0.45 µm and AM = 17.3 cm2. For Stage 1 operation at a constant-permeate rate of 15 mL/minute, pressure drop across the cake and membrane increases from 0.3 psi to an upper limit of 20 psi in 400 seconds. The permeate viscosity is 1 cP. If continued in a second stage at constant ∆P at the upper limit until the permeate rate drops to 5 mL/minute, estimate the additional time of operation.Prepare plots of permeate volume in mL and permeate flux in mL/cm2-minute as functions of time.

Diluted skim milk with a protein concentration of 4.3 g/L is to undergoDEF microfiltration. Experiments have been performed using a cellulose-acetate membrane with an average pore diameter of 0.45 µm and AM = 17.3 cm2. For Stage 1 operation at a constant-permeate rate of 15 mL/minute, pressure drop across the cake and membrane increases from 0.3 psi to an upper limit of 20 psi in 400 seconds. The permeate viscosity is 1 cP. If continued in a second stage at constant ∆P at the upper limit until the permeate rate drops to 5 mL/minute, estimate the additional time of operation.Prepare plots of permeate volume in mL and permeate flux in mL/cm2-minute as functions of time.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter7: Statistical Data Treatment And Evaluation

Section: Chapter Questions

Problem 7.18QAP

See similar textbooks

Similar questions

7. Determine the effective diffusivity for a substrate passing through each of the following membranes: The substrate has a free solution diffusivity (D.,.) of 8.13 * 106 cm²/s and has a molecular radius of 7.54 Å (Angstroms). Membrane Type Mean pore diameter (nm) Porosity (%) Tortuosity Cellulose-1 12.16 67.9 2.97 Cellulose-2 9.65 78.7 1.76 Which membrane would you recommend using to avoid diffusion-limited reactions? Acrylic Fiber 8.72 85.9 3.83
An open tubular column with a diameter of 215 um and a stationary phase thickness on the inner wall of 0.51 um passes unretained solute through in 79 s. A particular solute has a retetion time of 467 s. What is the distribution constant for this solute? Kp = What fraction of time does this solute spend in the stationary phase? ts !! ttotal
What is the strength of the ionic interactions between an ion with 1 positive charges and an ion with 2 negative charges, when the distance between them is 32.5 nanometers and the solvent is water, at 25 oC with a dielectric constant of 78.5? Calculate answer to 7 decimal places.specify units in the answer. Thank you very much for your assistance.
Osmotic pressure of the gold sol withconcentration of 4 g/l at 293 K is 8 Pa.Calculate the particles diffusion coefficient if gold density is 19.3 g/cm3, medium viscosity 10-3 Pa•s.
In an experiment to deposit ZnO doped thin films, 3.2mg of dihydrated zinc acetate was dissolved in 45g of methanol along with 3mg of bismuth nitrate as bismuth source. The experiment was conducted at 400 degree and well adhered thin films were obtained. Calculate the mole fraction of each species present in deposited doped ZnO thin films
12.6 Results from a soil-vapor study showed a soil-vapor concentration for vinyl chloride of 1500 ppmv. Use Henry's law to estimate the surrounding liquid- phase VC concentration.
Prepare 1500mL of 0.5N H2SO4 solution with specific gravity of 1.84g/mL and assay of 97%. Write complete solution using padpaper.
The sedimentation coefficient for a protein in solution is determined to be 4.3 S, and the diffusion coefficient to be 5.5x10-11 m2s-1 (vb = 0.74 mLg-1; density = 1.0 gmL-1; and viscosity = 1.0x10-3 Pas-1). Use this information to calculate the molar mass (kgmol-1) of the protein. Assume temperature of 298 K.
Human saliva contains the enzyme α-amylase which hydrolyzes polysaccharide acetal linkages. A soda cracker (containing starch) was carefully ground; the crumbs were distributed evenly between two test tubes. The first test tube contained only water, while the second contained a 1% solution of α-amylase. Both mixtures were heated to 35°C for 10 minutes and filtered. The filtrates were tested with iodine solution and Benedict’s solution. Use the following results to answer the questions below. Mixture Iodine test Benedict’s Test cracker in water dark blue blue cracker in water and α-amylase red red-orange precipitate a. Was the starch from the cracker/water mixture hydrolyzed? Was the starch from the cracker in the 1% α-amylase solution hydrolyzed? b. Which cracker contained reducing sugars?
T Normal II Aralik Yok Baglik 2 Ronu Bagl.* x x GE A-D-A- ASeç Paragraf Stiller Düzenleme Ses Duzenley Yazı Tipi STEP1 Put some FeS particles into a big tube. Add 1 or 2 mL of 18% HCl solution onto FeS particles. Immediately close the tube with Pb(NO3)2 or Pb(CH:COO)2 immersed filtration sheet. STEP2 Follow the same steps up to closing tube by filtration sheet. Fix the glass funnel to the tube after adding HCl solution. Close the outlet of funnel with Pb(NO3)2 or Pb(CH3COO)2 immersed filtration sheet. Reaction between FeS and HCl: FeS+2HC1 FeCl2+H2S Reaction on filtration sheet: H2S+Pb(CH3COO)2 PbS+2CH:COOH 1. Why filtration sheet turned black in step1? 2. What happened filtration sheet in step2?
5) A very thick slab has a uniform concentratio of solute A of C0-1x10^-2 mol /m^3 suddenly, the front face of the slab is exposed to a fluid having a concentration of solute A of C1=0.10 mol/m^3 a) Assuming that the slab is a semi-infinite solid,write down the equation that is cto be solved to determine the concentration profile of solute A, with the boundary and initial conditions. DO NOT solve. b) Calculate the flux in the solid at the surface (x=0) after t-300 s. The diffusion coefficient in the solid is DAB =4x 10^-9 m^2/s
The molar conductivity of NH4Cl at infinite dilution is 149. 7 02-1 cm² mol-¹ and the ionic conductivities of OH and Clare 198.0 and 76.3 -1 cm² mol-1, respectively. What is the molar conductivity of NH4OH (in 2-1 cm² mol-¹) at infinite dilution? Express your answer in four significant figures