cross flow filtration

cross flow filtation

1. CROSS FLOW FILTRATION A Seminar On Presented By : ROHINI KUMAR LAD Roll No:20150465 Department of Chemical Engineering Dr. Babasaheb Ambedkar Technological University , Lonere

2. Contents INTRODUCTION WHY CROSS FLOW FILTRATION ? CROSS FLOW FILTERS APPLICATIONS OVERVIEW REFERENCE S

3. FILTRATION Filtration is the process in which solids are separated from a fluid by passing the suspension through a membrane

4. Why Cross flow filtration? A higher overall liquid removal rate is achieved by the prevention of filter cake formation Maintains constant filtration rates. Process feed remains in the form of a mobile slurry, suitable for further processing Relatively high solids loads can be operated continuously without blinding.

5. Dead end vs Cross Flow

6. Characteristics of cross flow filters Pore dimensions Pore size distributions Porosity Surface properties such as zeta potential Hydrophobic/ Hydrophilic character Membrane thickness Features of cross flow filters:-

7. Techniques to improve cross flow filtration Backwashing Clean-in-place (CIP) Concentration Diafiltration Process flow disruption (PFD)

8. PRINCIPLES OF CROSS FILTRATION ARE USED IN

9. 1.Reverse Osmosis This is a water purification technology that uses a semipermeable membrane Applications Separating low molecular weight substances in solutions Concentrating and Cleaning wastewater Demineralization 2.Nano filtration Used for the particles up to 1nm Applications Fine chemistry and Pharmaceuticals Oil and Petroleum chemistry Bulk Chemistry Natural Essential Oils and similar products Medicine

10. 3.Ultra filtration Used for the particles in the size range from 10 3 to 10 6 Daltons Applications Whey protein concentration Drinking water filtration 4.Micro Filtration Used for the particles in the size range of 0.1-5 μ m Applications Water Treatment Sterilisation Petroleum Refining Dairy Processing

11. Filtration Unit for industrial cross flow filtration Here the recycle pipework is considerably larger than either the feed pipework or the permeate pipework A dedicated pump is used to recycle the feed several times around the unit These pipe sizes are directly related to the proportion of liquid flows through the unit

12. CONCLUSIONS Cross flow filtrations has been proved useful while handling viscous streams and fluids with large feeds containing a high proportion of small particle size solids (where the permeate is of most value) because solid material can quickly block (blind) the filter surface with dead-end filtration. Also the process feed remains in the form of a mobile slurry, suitable for further processing Solids content of the product slurry may be varied over a wide range

13. References Smith J.C. McCabe W.L. Harriott P. Unit Operations of Chemical Engineering . McGraw Hill (Fifth Edition) 2. Ramesh Bhave , Fermentation and Biochemical E ngineering Handbook , Chapter 7 3. J F Richardson, JM Coulson , JH Harker , JR Backhurst (2002) Coulson and Richardson chemical engineering (Volume2) (fifth edition) 4.Millipore tangential flow filtration 5.Sahan Ranamukhaarachchi, Lena Meissner, Christine Moresoli,Ultrafiltration and nanofiltration, October 2012. 6.Microfiltration in Dairy Processing ,U Merin,G Daufin, May 1990. 7.Nanofiltration technology in water treatment and reuse, Article in Water Science & Technology,February 2015.

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