PAMANTASAN NG LUNGSOD NG MAYNILA (University of the City of Manila) College of Engineering and Technology Department of Chemical Engineering PLATEAND FRAME FILTER PRESS DESIGN DESCRIPTION A filter press may be square or circular, vertical or horizontal. This type of equipment is consists of series of compartments arranged alternately and supported on a pair of rails with a filter cloth over each side of the plates. The slurry is fed to each compartment under pressure. The slurry passes through the filter medium and out a discharge pipe leaving solids behind. They are simple to operate, very versatile and flexible in operation. DESIGN SELECTION Plate and frame filter press was selected among the other types because the process requires high recovery of filtrate after extraction. Basically plate and frame filter press is used in batch processes. It is easy to operate and very useful whether the filtrate or the cake is the product. DATA AND ASSUMPTIONS 1. Mass flow rate of the slurry = 2,534.84 kg/batch (based from material balance) 2. Mass flow rate of the cake = 356.74 kg/batch (based from material balance) 3. Mass flow rate of the filtrate = 2,176.83 kg /batch (based from material balance) 4. Density of the filtrate = 1040.175 kg/m3 (average density composition of the filtrate) 5. Density of Cake = 3,304.01 kg/ m3(average density composition of the cake) 1 | Phosphatization of Calcined Tahong (Perna Viridis) Shells for the Production of Calcium Phosphate The time of washing (tw) is 10minutes (Brown.0 in thick plates and 3. 7th ed. Filter rate 2. Feed Temperature = 90OC DESIGN CONSIDERATIONS 1. of Chem.0 in thick frames are assumed since thickness of plates ranges from ¼ to 2 in. 7.1008) 2. 7th ed. 229) DESIGN REQUIREMENTS 1.PAMANTASAN NG LUNGSOD NG MAYNILA (University of the City of Manila) College of Engineering and Technology Department of Chemical Engineering 6. pg. The time of filtration (tf) is 30 minutes (based on experimental). The most commonly used medium for plate frames filter press is polypropylene fabric for filtering and is usually diatomaceous silica (Perry’s Chemical Eng’g Handbook.. The filter resistance (RC) is much less than the cake resistance (RM). pg.1008) 3. 19-65) 4. pg. Unit Operations p. Number of frames 5.82-83) 6. 8. 7th ed. Power requirement 2 | Phosphatization of Calcined Tahong (Perna Viridis) Shells for the Production of Calcium Phosphate . Safety factor is 20% (Plant Design and Economics for Chemical Engineers by Timmerhaus. Plate size is assumed to be 24 by 24 inches since the square plates range from 6 to 78 in. Plate area 3. Frame dimension 4. 5th Ed. 1008) 5.0 atm since pressure ranges from 3 to 10 atm in a plate and frame media (Unit Operations and Chemical Engineering by McCabe. Operating pressure is assumed to be 5. (Unit Operations by McCabe 7th ed. The 1. pg.. and thickness of frame ranges from ¼ to 8in (Unit Ops. pg. Table 3-1. Eng’g by McCabe. Mass of wash water 6. Filter Rate Using 20% safety factor (from Plant Design and Economics by Timmerhaus p.0762m Height = H = plate size + 2Lf = 24 in + 2(3 in) = 26 in = 0.7620 m x 0. Mass of Wash Water 3 | Phosphatization of Calcined Tahong (Perna Viridis) Shells for the Production of Calcium Phosphate .7620 m Dimension = 0. table 3-1) ( ) 2.8 m x 0.0762 m Use: 0. Number of Frames ( ) 5.0 in = 0.08 m 4.7620 m Width = W = H (since the frame is a square) = 0. Plate Area Since the plate is square. Frame Dimension Thickness = Lf = 3. 82-83. the area can be solved by: A= ( ) 3.7620 m x 0.8 m x 0.PAMANTASAN NG LUNGSOD NG MAYNILA (University of the City of Manila) College of Engineering and Technology Department of Chemical Engineering 1. 4 | Phosphatization of Calcined Tahong (Perna Viridis) Shells for the Production of Calcium Phosphate .PAMANTASAN NG LUNGSOD NG MAYNILA (University of the City of Manila) College of Engineering and Technology Department of Chemical Engineering ( ( ) ) ( ) ( ) .7 kg/batch 6. Power Requirement Using mechanical energy balance: Thus. Use 41. PAMANTASAN NG LUNGSOD NG MAYNILA (University of the City of Manila) College of Engineering and Technology Department of Chemical Engineering ( ( )( )( )( )( ) ) ( )( ( ) )( )( ) Use: 1.0 hp 5 | Phosphatization of Calcined Tahong (Perna Viridis) Shells for the Production of Calcium Phosphate . 1 m 34 Soruce: Pacific Processing Equipment 6 | Phosphatization of Calcined Tahong (Perna Viridis) Shells for the Production of Calcium Phosphate .7 kg 5 atm 0.82 atm 1.8 m x 0.3716 m2 0.9x 0.9 hp 6.0 hp Existing Design 3 m3 Polypropylene Fabric 0.3716 m2 0.08 m 13 41.8 m x 0.PAMANTASAN NG LUNGSOD NG MAYNILA (University of the City of Manila) College of Engineering and Technology Department of Chemical Engineering DESIGN SPECIFICATIONS PLATE AND FRAME FILTER PRESS Identification Item: Plate and Frame filter press Number of Required Units: 1 Materials Handled: Calcium Oxide together with Calcium Chloride Functions: Filters the slurry to recover the filtrate after extraction Design Data PARAMETERS Filter Rate Filter Media Plate Area Frame Dimension Number of Frames Mass of Wash Water Pressure Head Power Requirement Accessories Hydraulic Pump Feed Tank Product Collecting Vessel Flexible Hose Proposed Design 2.9 x 0.6 m3 Polypropylene Fabric 0. PAMANTASAN NG LUNGSOD NG MAYNILA (University of the City of Manila) College of Engineering and Technology Department of Chemical Engineering DESIGN CONFIGURATIONS Capacity: 2.9 hP 24 in 24 in Plate Area: 0.37161 m2 Filter Media: Polypropylene Fabric Plate Thickness: 1 in.0 atm Power Requirements: 0. 7 | Phosphatization of Calcined Tahong (Perna Viridis) Shells for the Production of Calcium Phosphate .6 m3/batch Pressure: 5.