Diva Envitec

Mira Road, Mumbai, Maharashtra

One of the most common and efficient of all pressure filters is the Candle Filter. These operate on a batch or a semi-continuous mode. The loads in the liquid streams can be in the 2-10% range solids. Very efficient to filter fine solids and use both surface and cake filtration. Diva Envitec Pvt Ltd makes Candle filters in cloth, SS membrane, SS Mesh, Wedge screens, SS Laminate material of constructions.   Applications   TiO2 Filtration Brine Clarification Catalyst Filtration Activated Carbon filtration Mineral slurry concentration Thickening of slurry Hot flue gas filtration Refined Oil Filtration   Feature and Advantages   Good chemical resistance High temperature resistance High radiation resistance Precisely defined removal rating/efficiency High void volume High permeability Lower pressure drop High dirt-holding capacity   Process Operation Candle Filters  give dry cakes by separating solids from liquids, additionally these  can also be used for thickening to produce a concentrated slurry by removal of the liquid phase as filtrate. Semi-continuous mode is possible when Candle Filters operate on very short cycle times taking advantage of the high filtration rates whilst the cakes are still thin. The flow of liquids can be from either inside-to- out or outside-to-in depending on the type of configuration chosen.   Technical Specification   Micron Ratings : 0.2, 0.4, 0.5, 1, 2, 5, 10, 20, 40 Microns Size : 250, 500, 750, 1000 mm, 1500 mm seamless designs End Connection : Double ‘O’ Ring, Flat Gasket, Threaded, or as per design Outer Diameters : 25 – 300  mm – or suitable as per requirement – specials also possible on quantity orders Material Of Constructions: SS, Polymers,  Alloy Steels, Special alloys Inconel, Hastealloy etc. Any dimension made available on specific order Grades Available :   IS   – Iso-Static compressed  sinter Powder filters,   AS -Asymmetric Membrane two layers sintered powder filter element,   Fabric Media,   Wedge Wire,   Ceramic,   Polymeric etc.    Candle Filter Continuous Filtration General Filtration Metallic Filters Modular Spin Disk Filter MSDF NanO-Cavitation Precision Sintered Process Membrane Systems Spargers – Gas Liquid Inteface Applications Precious Metal Catalyst Recovery Activated Carbon Filtration  

General Filtration covers all utility filters, online filters required in a process plant. The down-times and repair costs are reduced drastically if filtration of all fluid stream is made an important part of the process. Diva Envitec Pvt Ltd supplies the complete range of filters to cover the general filtration requirements of a plant.   Applications Filters on Solvent lines Steam utility filters Process feed to reactors Compressed Air / Nitrogen Instrumentation air Pre-treatment RO Process water Feature and Advantages Plant efficiency is improved by employing the right type of filters in the plant.  The effectiveness and the benefit of these filters is only realised after a filter audit is done to see how much downtime is associated with a poor quality filtration. Available in Stainless Steel,  PP/PTFE Lined, Carbon Steel, specialty alloys like Inconel, Monel, 904L etc. Pressure ratings up to 15-20 Kg/cm 2 or more Generally designed in accordance to  ASME  Low-pressure drop Range of temperature from minus up to 200ºC operating Inlet outlet connections – Threaded, flanged Easy to open – Rothman clamps or Davit arm assembly for top dome opening (Hydraulic closing and opening available as an option) Epoxy finish on carbon vessels Process Operation The liquid to be filtered enters the housing and the flow is normally from out to in the element. The filtered liquid passes the filter cartridge and the candles are replaced of cleaned depending on the type of media used.   Technical Specification Cartridges – PP, PES, Nylon, PTFE Bag Filters – PP, PES, SS Self Cleaning Filters Coalescing Filters for compressed gases/Instrumentation air Sintered Powder -SS, Hastealloy, Monel, 904L, Duplex etc Sintered Fiber mesh -SS, Hastealloy, Monel, 904L, Duplex etc Sintered mesh plate  -SS, Hastealloy, Monel, 904L, Duplex etc Wedge Wire Screens  -SS, Hastealloy, Monel, 904L, Duplex etc  

Diva Envitec  introduces   NanO-Cavitation Reaction Engineering  Technology for the process Industry. The  flow reactor design represents  a unique innovation in the process engineering space, enabling low-cost, highly tune-able, continuous-flow, physical and chemical, liquid mediated nanO-Cavitation processes.   Applications Multiphase Reaction Precious Metal Catalyst Surface renewal/washing Enhancement of liquid-liquid extraction processes Biodigestate disintegration for increased Biogas generation Foam reduction in Fermenters Chemical / Biocide Reduction in Cooling towers Mixing of Liquid Streams Degassing of viscous fluids Herbal and Aroma extraction Biodiesel Trasnesterification Waste water treatment, including sludge disintegration Catalyst manufacture via nanoparticle generation Nano-milling of pigments in paint manufacturing     Feature and Advantages Nano-Cavitation has a  salient features in  its  design  that it overcomes the  challenge of scaling up cavitation processes from pilot plant scale to industrial scale, retaining energy efficiency Highly energy-efficient nano-cavitation in a continuous flow reactor Ability to scale outward to industrial processing rate with minimal design complexity Facility for multiple thermal zones, enabling unique new reaction processes Process Operation The concept evolves from a conventional single-channel flow reactor, such as emulsification processors or cavitation cell disruptors, providing high fluid volume throughput, with balanced exposure to the entire reaction medium, via multiple controlled nanO-Cavitation zones. Reaction mixture is pumped into a lower holding chamber where it gets evenly exposed to high energy  nanO-Cavitation in the multitude of parallel channels. The processed reactants flow up to the upper holding chamber through the outlet nozzle, all this operation can be done in  totally  gas-tight sealed environment. Technical Specification Electric supply : 230 volts, 50 Hz A.C., 1 Phase or 3 Phase Cavitation  power : 120 watt. (lab ). upto few  KW Amplitude/Power control : A variac control is provided to vary amplitude/power from 40% to 100% Frequency : 30 + 3 kHz. Probe Tips : Titanium tips. 15mm & 5 mm dia. Cavitation  horn : S.S. horn fitted with Piezo electric crystals. Cavitation horn is mounted on a vertical stand with flat bed at the bottom. A separate mechanism is mounted on flat bed to move vessel base up/down. Cavitation generator : Solid state design with auto – tuning. It has one module delivering 120 watts of ultrasonic power. Cavitation generator is housed in separate powder coated cabinet.Since the transducer and horn are precisely synchronized with the Piezo element, there is very little noise hence no noise proof enclosure is required.

The  precision  sintered family of filter elements are manufactured by co-axial pressing.  A wide range of different geometries can be obtained by means of this pressing process. The pore size is made to measure from 0.5 µm to 200 µm. Sintering turns elements into dimensionally stable, metallurgically  strong components which can be used as self-supporting constructional elements. The pores are fixed in terms of size and position. A special production technique allows the joining between porous and solid materials in a compacting process, resulting in so-called filter modules.   Applications Flow Restrictors Flame arrestors Sensor Protection Automotive Components Pneumatic Silencers Oil Burners Feature and Advantages Chemical Resistance and Thermal Stability : The chemical and thermal characteristics of sinter metals are the same as those of the solid materials used. However, the size of the specific surface area should be taken into account when assessing the chemical properties of any high-porosity component (sinter metal). Process Operation The pore size and structure determines the flow pattern desired by different applications. The gas / liquid flows through the porous matrix and based on the functionality the media takes active part in the process. Technical Specification AXIAL sintered products are  manufactured from the following materials: Stainless steels 1.4404 (AISI 316 L / B), 1.4306 (AISI 304 L), 1.4539 Titanium Monel Inconel 600 / 625 Hastelloy C 22, C 276 and X Special materials

Liquid -Gas interphase reactions use sintered  spargers with tiny pores producing millions of tiny droplets  increasing the mass transfer surface area of reactions. Sintered spargers increase the mass transfer surface area almost 8-10 times then a drilled pipe sparger..   Diva Envitec designs spargers with vacuum fused sintered metal tubes/plates. Static and Dynamic spargers are configured for effective sparging applications without having ant moving parts. The designs could be from a single element to manifolded multiple element system, Easy to install and very effective and  efficient gas/liquid contacting solutions are designed by Diva Envitec Pvt Ltd.   Pore sizes of 0.5 – 200 μm availbale Recommended pore size 3 – 10 μm with  no seams on porous body Customized flow rates and design Long life time High flow rates Ring sparger available (min dia. 200mm) Broad range of alloys available Customized fittings Standard available   Operation The gas is dispersed as a fine mist increasing the mass transfer area – so reactions when liquid-gas interphase reactions are carried out, the increased surface area enhances the reactions. Technical Specifications Sintered metallurgy which is vacuum fused bringing in ductility and strength for these applications. A wide range of metallurgy  spargers are constructed entirely of metal, to provide long-lasting operation even in  temperature range  as high as 450 Deg C under oxidizing conditions and 550 Deg C in reducing conditions. Wide range of materials including 316L , 304, stainless steel (standard), Nickel, Titanium,   Monel® 400, Inconel® 600, Hastelloy® C-22/C-276/X, 321  904L etc. Applications and Uses Aeration – Air sparging to meet BOD (Biological Oxygen Demand) on waste stream. Agitation – Air injection for mixing liquids in a vessel. Bioremediation – Air sparging to stimulate growth of bacteria for hazardous waste treatment. Carbonation – CO2 sparging for carbonated  beverages and . Chlorine bleaching – Chlorine sparging for bleaching pulp in manufacture of paper. Column flotation – Air sparging for coal flotation,  and other separations of solids. Dewatering – Nitrogen sparging to remove entrained water from motor oil. Fermentation – Oxygen or air sparging to enhance cell growth in fermentation reactions. Gas/liquid reactions – Sparging air, oxygen, or other gases into reactors for improved performance. Hydrogenation – Hydrogen sparging for a broad spectrum of chemical hydrogenation reactions. Oil flotation – Air or natural gas sparging for oil removal from produced water from oil wells. Oxygen bleaching – Oxygen sparging for bleaching pulp in manufacture of paper. Oxygen stripping – Nitrogen sparging to remove oxygen from edible oils, and juices. Blanketing in Storage tanks Oxygenation – Oxygen sparging in fish farming for significant stimulation of fish growth. Ozonation – Ozone sparging to sanitize ultrapure water systems in pharmaceutical plants. pH control – CO2 or NH3 sparging to adjust pH in waste or process streams. Steam injection – Direct steam injection for efficient heating, and to eliminate “steam hammer.” Volatiles stripping – Air sparging for removal of VOC (Volatile Organic Compounds) from waste streams

API , Chemical, Sugar and Pharmaceutical manufacturing use Activated carbon. Specific activated carbons provide superior removal of colour compounds, odour compounds, proteins and other contaminants that could be present in the raw materials, or that form during production.  Removal of these carbon particles from final product is a daily chore at these facilities.  Contufilt – M is an outside-in candle filtration process  for polishing and removing activated carbon  from slurries. The systems are back washable and easy to use and maintain.   Applications API and Pharmaceutical solutions Slurry Oil Filtration  Sugar Syrup Filtration Refined Oil Filtration Feature and Advantages Totally Closed System No manual Handling Defined Micron Retention with Cake Easily Backwashable No Bypass Zero Product Holdup Small System sizing Low Downtime Process Operation The system consists of a number of equally sized pressure vessels each containing an equal area of Sintered fused filter tubes  or Laminates, which  are arranged in triangular pitch or distance suitable for applications. The vessel performs the specific functions of filtration, in-situ reverse flow, gas assisted or filtered liquid backwash discharge of collected dirty cakes. You could also backwash  to re-slurry the  solid cakes for washing and product recovery. The mechanism of filtration is a direct interception of  particles in  solutions  on the surface of the Sintered Fused laminates or tubes. This initial capture starts and enhances the capture of all other particles building a coarse and porous  cake, which enhances the filtration efficiency.  Sometimes to assist the filtration in difficult to filter masses a body feed with the necessary grades of keisulguhr, perlites, Filter-cel are used and then the  ongoing formation of a surface cake continues to build- up to a depth of 10 – 15 mm or greater depending on the cake resistance and characteristic. Complete recovery of liquids is achieved and the particles are purged out of the system without having to open the system. These candle systems are far superior to Plate and frame filter presses, Leaf filters both horizontal and vertical type due to effective cake release, closed system for washing and ability to take high feed pressures. The Fused sintered Tubes  or Laminates  have a open profile and are easy to be backwashed. The backwash filter system is used in slurry de-colorisation using activated carbon polishing filtration in syrups and solutions for improved product quality and reduced operating costs. Technical Specifications 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 m 2 , withstands differential pressure as high as 10-15 Kg/cm 2 . Designed generally in accordance with ASME section VIII. The housing are  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    

Metallic Filters – Sintered metal filter powder or fibre media , wedge screens or mesh laminates  are being used in industry and are making inroads into many applications as there is increasing concern about environmental issues. The Polymeric conventional filtration systems based on disposable filters are losing grounds, particularly as disposal costs are increasing and its becoming mandatory to keep pollution under control.     Applications   Catalyst Recovery – Caprolactam, H2O2 Catalyst Bed Protection Coal Gasification Ammonia Hot Gas Mixture Flue gas Filtration Hot  Gases – Process Polysilicon manufacturing Cryogenic Applications Gas filters for chemical processing Semiconductor manufacturing applications FCC Slurry Oil Filtration PTA/CTA slurry filtration FCC Vent filters Solvent filters for chromatography systems   Feature and Advantages   100% seamless construction– no welding seams on porous body Excellent back pulse performance Long life time High flow rates Extremely high collapse pressure Submicron pore sizes available Broad range of alloys available Customized fittings Standard filter design   Process Operation Cleanable metallic filters offer varied solutions. New developments by companies worldwide in this area are ensuring that increased quality level through a finer filter rating, and an extended on-stream lifetime is no longer a constraint. The system consists of a number of equally sized pressure vessels each containing an equal area of Porous sintered powder or multi-layered mesh metal cartridges  arranged in triangular pitch or distance suitable for applications. The vessel performs the specific functions of filtration, in-situ reverse flow, gas assisted discharge of collected dirty pre-coats  and when required, an in-situ soak to re-slurry the pre-coat / solid cakes if required. For gas applications the metallic filters work similar to Bag filters but for more harsh conditions.   Technical Specification 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 housing is  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. The filter element integrity test can be performed on all filter elements  using a nondestructive “Bubble Point Test”  which correlates to its micron retention.   Grades Available IS – Iso-Static vacuum sintered Powder filters SS Fiber sintered mesh Poromesh – 5 layered Sintered mesh   We get our media from  world leaders in metallic filters  who associate with us to find solutions for exacting industrial problems. The USP of these filters is a high porous structure, which is characteristic of a sintered metal media. This gives an edge over other filters in terms of high permeability and hence low pressure drops. In comparison to its competitive range of Ceramic filters, the filter wins hands down due to its excellent thermal-mechanical characteristics.   Candle Filter Continuous Filtration General Filtration Metallic Filters Modular Spin Disk Filter MSDF NanO-Cavitation Precision Sintered Process Membrane Systems Spargers – Gas Liquid Inteface Applications Precious Metal Catalyst Recovery Activated Carbon Filtration Hot Gas Filtration  

New Design MSDF is a development moving away from conventional cross flow filtration towards spin filtration. The advantages of spin disk  filtration lies  in the improved cleaning  effect on the filter surface at a reduced energy cost.     Applications  Chemical Pharmaceutical Industry Organic solvents colour removal Activated Carbon filtration Biotechnology Enzyme concentration, diafiltration Yeast recovery and concentration Cell separation Protein concentration Bioethanol Microfiltration of cellulose Food Technology , clarification Tomato puree Haze Removal Sparging Paper Industry Resource recycling Closed loop techniques Sieve water paper mills Paints, pigments , adhesives Pigments desalting Solvent recycle Lacquer de-watering Water soluble glue concentration Metal-Working Industry Cooling lubricants Cleaning units Emulsions, suspensions Aluminum swarf water Waste Water Treatment Digested sludge Water recycling MBR / aeration Sparging Features and Benefits High temperature resistance (0-130 ºC) with varied range of membranes starting from Polymers to Ceramic to SS membranes Broad pH range (0-14) Resistance to aggressive solvents, oxidants and most chemicals Steam Sterilization (autoclave, oxidant, etc.) Extremely high cross flow velocities – with no filter blocking Reduced energy costs compared to conventional cross flow systems Modular design with large scalability options Repeatability in fluxes Excellent mechanical resistance (High Solid loading) Process Operation Prerequisite for a continuous filtration method is how to avoid filter media blocking by  preventing the formation of a secondary resistive  layer on the filter media surface (filter cake). This always requires continuous cleaning of the filter surface during the process. Conventionally this is being done with tangential or cross flow technologies with high velocity flows. The shear forces that occurred this way prevented the formation of a filter cake. In order to achieve this cross flow effect, it used to be necessary to move high liquid volumes with powerful pumps. The excellent filtration capacities were offset by high energy costs. Dynamic cross flow methods work with much less energy consumption. The relative motion between the medium to be filtered and the filter is not generated by pumps but instead by the rotation of the filter elements  or a rotation of flow disrupters. MSDF membrane systems  operate using  membrane disks of different  MOC  that are configured  in modular stack mode on a rotating shaft.  That separation technology purely relies on the differences in physical sizes in the MF range and in the molecular weight (size) of the individual components when processing in the MF and UF range.  The membrane pore is a safe barrier for any insoluble matter (i.e. protein complexes if any,   triglycerides, fats, oils, bacteria, colloidal matter, fibres etc) irrespective of the incoming concentrations. The selection of the right membrane or filter media is more from experience of working in similar applications. Technical Specifications Membrane types available suitable for a wide range of applications and process conditions. Modular Design : Area – 1 sq.mts to 100 sq.mts UF/MF  MEMBRANES: PP, SS, Ceramic – MW Cut-Off or Micron : 1, 000 MW, 5, 000 MW,   10, 000 MW,   20, 000 MW, 25, 000 MW, 30, 000 MW, 50, 000 MW,   100, 000 MW,   120, 000 MW, 0.05 Microns,   0.1 Microns, 0.2 Microns,   0.45 Microns, 0.65 Microns, 0.8 microns, 1.2 microns, 3.0 microns.

• Automation GradeAutomatic
• Temperature (deg. Celsius)80

Sugar and distillery industries complement each other. India mainly has Mollasses based distilleries which are mostly integrated with Sugar Mills. The grain based distilleries are stand alone and both these industries have their unique problems. Diva Envitec Pvt Ltd has been associated with the Sugar Technologist Association of India (STAI) and All India Distillers Association of India (AIDA) for many years and have been finding solutions for these industries. Most essential in this industrial are meeting high purity standards and our filters and solutions can help achieve this. We have suitable products and solutions in the following areas:

Metallic Filters – Sintered metal filter powder or fibre media , wedge screens or mesh laminates are being used in industry and are making inroads into many applications as there is increasing concern about environmental issues. The Polymeric conventional filtration systems based on disposable filters are losing grounds, particularly as disposal costs are increasing and its becoming mandatory to keep pollution under control.