FILTER PRESS Specification Sheet

List of Assumptions:

1. 2. 3. 4.

The resistance of the filter medium is zero. The volume of wash water is 10% of the total volume of filtrate. Filtration is carried out in batch operation [1 batch per day]. The time of filtration, will be four [4] hours.



5. The dumping, cleaning and reassembling time, thirty [30] minutes. 6. The operating pressure is 625 kPa.



of the filter press will be

Design Equations: 

Filtrate Density,

 



       



Where:

                  



k Value Assume: Rm = Resistance of the filter medium = 0 Ve = fictitious volume of filtrate per unit of filtering area = 0 t

= time of filtration = 4 hrs



Rate of Filtration,





Rate of Washing,





Time of Washing,



                

       

Where:





    

Total Filtration Time

      

Calculation for the Area of Filtration (Ref: Plant Design and Economics for Chemical Engineers by Peters and  Timmerhaus pages 543-545)

         



         



Cake Resistance, (Ref: Plant Design and Economics for Chemical Engineers by Peters and  Timmerhaus pages 543-545)

                 

= constant with value dependent on the property of solid material

Design Calculations:

From Material Balance: Filtrate Composition: Components Xylose Soluble Lignin Water Sulfuric Acid Total

Mass, kgs Density, kg/m 13565.80 1525.00 68.88 1300.00 38639.87 995.70 774.65 1825.00 53049.20

Filter Cake Composition: Filter Cake : 28,308.10 kgs

Volume, m 8.90 0.05 38.81 0.42 48.18

Components Unhydrolyzed Pentosan Cellulose Insoluble Lignin Ash Aqueous Solution Total

Mass, kgs 1048.67 12587.71 13847.22 283.18 541.32 28308.10

                    

Filtrate Density,

:



Calculation for k value:

Rate of Filtration:

Rate of Washing:

Since

                                                     

          

Therefore,

Time of Washing:

                        

Since the dumping, cleaning and reassembling time, minutes,

of the filter press is 30

           For Filtration Area:

For viscosity:

Cake Resistance:

         

                     ()              