Nutsche Filters-Dryers

Nutsche filter

Pope Nutsche Filter-Dryers are known and used world-wide for critical high purity separations of liquids and solids. Products include pharmaceuticals, bio-materials, electronics grade materials, fine specialty chemicals, and many others. Pope Nutsches are preferred for this separation, a critical operation because it is often the final step in an entire manufacturing process, prior to packaging.  In most applications, the solids are the product, often being highly pure crystals from reaction and precipitation, suspended in a solvent slurry.  After liquid from the slurry passes through the filter, the solids may be further dried and then harvested.  In other less common applications, the filtered liquid discharge is the valued product, with the solids being removed and remaining in the nutsche filter.  Pope’s designs accommodate both modes.  Highest quality design, materials, manufacturing, welding, finishes, components and functionality are assured.

These units provide capabilities for solids filtering, washing, reslurrying and drying in a single vessel, reducing process time and worker and environmental exposure.  Pressure capability facilitates filtering rate and vacuum capability facilitates filter cake drying rate which can be additionally aided by heat and cake agitation.

 

Nutsche Filter Dryer

Nutsches are available in lab bench through pilot plant and production scale, in volumes from 0.2 through 1000 liters. While there are several variations and many options offered, features in common throughout the line include:

  • 316L stainless steel fabrication or other alloys including Hastelloy C-276/C-22 optionally available.
  • ASME stamped and certified for full vacuum and pressures up to 200 psi, at -80°C to 250°C temperature. Other certifications, including CE/PED, CRN, SELO and NR-13 available.
  • High purity design, various pharmaceutical grade finishes including electropolishing; sanitary type ports are standard.
  • Optional jacketing for heating/cooling or electric heaters.
  • Optional coatings including Teflon.
  • Full range of optional agitation, including raising/lowering agitators and conventional mixers.
  • Safety pressure relief valves or rupture disks.
  • Spray assemblies for admitting filter cake washing/reslurrying liquid and for CIP use.
  • Valves for pressurization, vacuum, venting, slurry addition, draining, etc.
  • Pressure/vacuum gauges, optional transmitters.
  • Sight glasses and sampling ports.
  • Other instrumentation such as thermometers temperature transmitters, level, pH, controllers, etc. available.
  • Wide variety of filter pore sizes and types, 0.1 to 200 micron pore sizes, stainless steel, Hastelloy, polypropylene, special membrane and other filter materials available.

 

filter dryer

Pope’s smaller lab scale Nutsche units provide chemists and researchers with a very powerful tool for testing, piloting and small scale processing. These are a logical leap forward from common Buchner funnel apparatus, providing important advantages including: pressurization for faster filtering than vacuum draining alone, vessel vacuum and heating capability for efficient drying of filter cake, built-in spray heads for filter cake washing, complete material containment for increased safety and purity plus gas blanketing capability, optional mixers or cake agitators for churning/re-smoothing filter cake for greater drying efficiency. These lab units are also ideal for pilot work in simulation of larger production scale Nutsches.

Standard Benchtop Nutsches are available in 6” diameter, with choice of 3, 4 or 5 liter volumes and are kept in stock for short delivery times. ASME stamped, (other certifications available), and pre-fitted with useful components including valves, sightglasses, pressure relief, spray assembly and pressure/vacuum gauge, the user can select optional jacketing or electric heating and optional choices of either motorized mixer or else up/down cake agitator in manual or motorized versions. Further information is available in our Benchtop Flyer.

Custom Benchtop Nutsches are also offered in sizes as small as 3” diameter, volumes as small as 0.2 liters. Extent of componentry depends on size and other considerations. Larger units than the Standard Benchtop Nutsche are also available, though these 8” and larger diameters and weight of these brings them more into the domain of floor standing pilot category rather than Benchtop category. See next section.

In addition, Custom Benchtop Nutsches can be designed for various requirements, including such features as custom stands, funnel heads, instrumentation, heating/cooling circulators, alternate alloys and coatings, pumps, or other customization.

 

Larger Nutsches are available in volumes including 10, 20, 30, 40, 50, 100, 200, and up to 1000 liters, plus any special volumes in between. “Typical” type units are offered providing a similar feature set as the Pope Benchtop series, but in addition, several design choices plus a very broad range of unique customization are available. 316L stainless steel construction is standard, other alloys, coatings and special finishes are available. ASME certification is standard, CE/PED and others also available.

There are many different types of customer’s applications, process requirements and preferences. Pope’s Nutsche applications professionals are on hand to assist clients with specification and quotation of optimized equipment. The starting point for this is our Nutsche Application Questionnaire. Sizing of units depends on the total slurry volume, the quantity of expected filter cake to be collected and other issues; Pope’s Cake Depth – Volume Chart is utilized in this determination. Other design considerations include:

Vessel flanges

Sanitary clamp type flanges can be utilized in even sizes up to 12” diameter vessels. The lower flange is a special variation which allows for holding and sealing a variety of filter screens and fabrics. Upper removable lids and flanges are available also. Beyond 12” diameters, heavy duty flanges and C-clamps are utilized.

Geometry

The most basic vessel geometry is a single lower flange only. With this design, the entire body is raised up, or the bottom end is lowered from the body to harvest the filter cake. Another option is to also have a removable top head. This provides the user with two means of access and harvesting, removing either the top or the bottom head, or both. Some users prefer to have an additional flange for vessel break-apart a short distance or midway up from the bottom filter flange. This provides for containing of the filter cake when the upper section of the vessel is removed, and convenient cake harvesting without spillage. There are other variations including “removable basket” design. See photos for examples.

Support

Nutsche vessels normally come with legs with locking castors. Depending on geometry, (see above) the number and location of legs may vary. With vessels larger than 8” diameter, the vessel sections can become heavy and inconvenient for manual movement and lifts are typically provided for safe raising/lowering and movement across rooms. Variations can include self contained lifts, platforms, and specialized frame for manual or automated rotation of vessel. See photos for examples.

Agitation

In many cases, though not all, some means of agitation is required or preferred. Pope’s Series 700, 800 or 900 mixers are offered for conventional type stirring of slurry before or during filtration or after reslurrying. Raising/Lowering cake churning and smoothing agitators are also offered. These provide grater efficiency in braking up clumps and shortening drying time.

Heating

Vessel jacket heating is offered to help in drying the filter cake.  Heated dry air or nitrogen can also be admitted at a fixed rate. These, in conjunction with vacuum and cake agitators optimize drying efficiency.  Electric heaters are available as an alternate to liquid jackets

Filters

Multi layers stainless steel filter screens are available from 1 to 200 micron pore size.  50 micron filter are “standard”, covering a wide range of applications. In addition, polypropylene cloth and other special type membrane filters can be used. Pope’s designs provide customers with a choice and changing from one type to another without any further nutsche unit modification.

Other Features

Many options are offered including sight glasses, valving, pressure and temperature indication/control, other sensors, sampling ports, spray head, and side discharge harvesting ports.  Special skid mounted systems combining liquid and vacuum pumps, reactors, control systems and other turnkey features are also available

 

55 gallon, 24” with non-removable top head, jacket, 800 mixer, showing lift truck lowering bottom filter plate head

Nutsche Filter-Dryer Examples

Benchtop Nutsche with manual up/down cake agitator Jacketed Benchtop Nutsche with motorized up/down cake agitator 3-liter 6” Benchtop Nutsche Rotating nutsche  with Funnel, Container & Electric Agitator
1-liter 4” Special Benchtop Nutsche with manual up/down cake agitator 4-liter, 6” jacketed Benchtop Nutsche with motorized up/down cake agitator (& special upside-down hanging arms) 3-liter 6” Benchtop Nutsche, jacketed, showing harvesting of dried filter cake 4 Liter Rotating nutsche  with Funnel, Container & Electric Agitator

Nutsche - 5 gallon 9” 3-piece “basket” style with removable filter holder, jacket, 800 Mixer, cart, disassembled Nutsche - 5 gallon 9” 3-piece “basket” style Nutsche - 10 gallon 12” 2-piece cake retention sanitary flange Nutsche - 40-liter, 12” 2-piece cake retention sanitary flange type
5 gallon 9” 3-piece “basket” style with removable filter holder, jacket, 800 Mixer, cart, disassembled 5 gallon 9” 3-piece “basket” style with removable filter holder, jacket, 800 Mixer, cart, assembled 10 gallon 12” 2-piece cake retention sanitary flange type, jacket, motorized up/down cake agitator 40-liter, 12” 2-piece cake retention sanitary flange type, Hastelloy C-276, (unjacketed unit ), & SS, (jacketed unit)

800 Mixer 800 Mixer 800 Mixer 800 Mixer with air motor
10 gallon, 12”, with jacket, 800 Mixer, side access port, Teflon coating, 360° rotation support frame 20 gallon 18”, with side & bottom jacket, 800 Mixer, side access port, 360° rotation support frame 12 gallon, 12”, with sanitary heads, 800 Mixer, 90° rotation support frame, (motorized rotation option available) 120-liter, 18” 3-Piece with removable top head, jacket, 800 Mixer with air motor

800 Mixer with air motor, side access port 800 Mixer with XP motor 37 gallon, 18”, basic unit, no removable head or jacket, 800 Mixer, with lift truck 55 gallon, 24” with non-removable top head, jacket, 800 mixer
37 gallon, 18” 3-piece cake retention type, with jacket, 800 Mixer with air motor, side access port, 8 legs 37 gallon, 18” unit with non-removable top head, jacket, 800 Mixer with XP motor, recirculation pump system 37 gallon, 18”, basic unit, no removable head or jacket, 800 Mixer, with lift truck 55 gallon, 24” with non-removable top head, jacket, 800 mixer, showing lift truck lowering bottom filter plate head

Jacketed Nutsche Sanitary Flange Style 40 Liter Nutsche with pneumatic bottom head lift and cart 20 Liter Nutsche + Reactor System with Detachable Hoppers  
20-liter, 8” jacketed nutsche, sanitary flange style, 3-piece cake retention type, electric 800 mixer, Teflon coating 40 Liter Nutsche with pneumatic bottom head lift and cart 120 Liter Nutsche + Reactor System with Detachable Hoppers  

 

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