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CATALYST FILTRATION IN THE PROCESS INDUSTRY

Diva Envitec CONTUFILT-M   offers  an  outside-in filtration for polishing and removing solids, catalysts in hydrogenation slurry filtration. The systems are back washable and easy to use and maintain. The mechanism is either to remove the catalyst from fluid streams or re-slurry and send them back to the reactor.
 

FEATURES

• Closed system: Helps reduce operator exposure to hazardous materials
• Accessibility: Easy access to elements from top
• Compact Design: Element bundle is removable as an assembly
• Coded Vessels: Filter areas up to 200 m2, withstands differential pressure as high as 300 Kg/cm2. Designed generally in accordance with ASME section VIII.
  

The Ideal for polishing filter applications, Metal catalysts, inorganic bromide salts, copper chromite catalyst recovery, and ion exchange filtration applications

 

OPERATION:

The system consists of a number of equally sized pressure vessels each containing an equal area of Porous metal cartridges  arranged in multi-cylindrical form. The vessels performs the specific functions of filtration, in-situ reverse flow, gas assisted discharge of collected catalyst and when required, an in-situ soak to re-slurry the catalyst if required.
The mechanism of filtration is a direct interception of catalyst particles on the surface of the Porous metal filter. This initial capture starts and enhances the capture of all other particles 2 micrometer and larger. This ongoing formation of a surface cake continues to build- up to a depth of 3 mm or greater depending on the cake resistance and characteristic.

At the end of each filter cycle, solids are backwashed off the inside of the elements and discharged as a concentrated slurry or wet cake.

• Offers ultimate particle retention, back-washability, solids capacity and strength
• Can be used in conjunction with filter aids for difficult filtration applications

 The porous metal backwash filter system is used in slurry Hydrogenation chemical reactions  to remove catalyst solids for improved product quality and reduced operating costs.

BACKWASH:

 The backwash system should provide efficient separation of fine particles from a fluid stream by collecting the particles on the surface of a composite stainless steel, sintered metal filter. The filters are then cleaned, in-situ, by backwashing in the reverse direction, dislodging the solids from the filter and flushing the filter vessel. The filter system should function with no loss in collection efficiency or suffer from physical degradation due to chemical attack.

 Since powdered sintered metal and felt metal have depth to them, these small catalyst particles will pass through the surface pores and become lodged within the depth of the sintered powder metal where they cannot be dislodged by simply reversing the flow of liquid. Only powdered metal or felt metal filters are not acceptable for this application. Therefore membrane sintered SS medias are  used and not simple isostatic filters.

HOUSING DESIGN:

The housing has been  designed for:

• the specified pressure at the temperature given in the technical specifications
• even flow distribution,
• specified element spacing for cake build up, and
• easy access for change-out (i.e., a solids sump area for catalyst capture).
  
  

The filter housing is made of SS 316 with  Nozzles for inlet, outlet, drain, backwash fluid, vent, and pressure taps with suitable  connection size and type for proper operation as per the flow parameters specified.  The initial clean pressure drop across the filter elements and housing is around : 300 mBar ( not possible with Rolled Sintered sheet with In to Out flow pattern for trapping the catalysts)

The housing has been designed and  fabricated, generally  in accordance with the ASME Boiler Pressure Vessel Code, Section VIII, Division 1.

Testing if required: Special requirements for non-destructive testing like radiography, liquid penetrant inspection, magnetic particle inspection, leak testing, etc. should be specified as required, and is charged extra.

TESTING:

The entire filter system is hydrostatically tested in accordance with ASME Code, Section VIII, Division 1.

A filter element integrity test should be performed on all filter elements prior to shipment using a nondestructive "Bubble Point Test" that has been correlated to a destructive challenge with test contaminant to certify it meets the rated efficiency.

AUTOMATION:

We have considered a manual system, but if automation is desired we can also provide this as an option.

The control system will provide  both automatic and manual modes of operation for the filter system. In automatic mode, all valve sequencing and operations are handled by the control system based on a minimum of operator inputs. To accommodate unusual operational or maintenance requirements, a manual mode of operation is provided. When operating the system in manual mode, the operator has full control of all valve sequencing and operation from the main control panel. All filter system process variables are available to the operator on the control panel. The control system is designed around a programmable controller. The controller is equipped with sufficient 240 volt and analog I/O to monitor and control the entire filter system. The controller supports the Allen Bradley or equivalent , plus an automation network which allows peer to peer communications to other PLCs.Mostly the customers have chosen the option of manual operation as these customers belong to the API and Pharmaceutical sector.

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