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Pope Scientific Inc. Upgraded Series 700 Compact Sanitary Mixers

Pope Scientific Inc. Upgraded Series 700 Compact Sanitary Mixers

Pope Scientific Continues to Improve and Upgrade their Line of Stainless Steel Process Mixers

The line consists of Pope’s Series 600, 700, 800, 900 mixers, covering vessels between 0.1 and 1000 liters in size. The focus of the product line is high purity and sanitary use and where pressure and vacuum operation are required. Applications include blending liquids, dissolving or suspending solids, reactions, fermentation, crystallization, high shear mixing with size reduction, or stirring. All are rated for high vacuum and pressure at a wide range of high and low temperatures, with excellent chemical compatibilities as standard. They are designed for critical use in fine high purity chemical, pharmaceutical and food applications, are CIP and SIP capable, and cGMP validatable.

The most recent upgrades have been to the Series 700 Mixer. This is a more compact version of the long-established Pope Series 800 models, sharing all of the high-performance features of the larger sibling, but used for smaller vessels and reactors from 0.1 to 30 liters in volume and where space is limited. It is ideal for laboratory through mid-pilot size operation where compactness, robustness and high performance are key. Experimentation, process scaleup and small-lever production are all possible.

Versatility is built into the design, with options including interchangeability of AC or DC electric motors or air motors of different power, gearing, speed and classification, all quickly removable for mixer autoclaving or storage. Additional choices include impeller types, sizes, quantities and changeable positions. Pope’s default is a 3-lobed marine style impeller; several additional choices include turbine, pitched, radial, anchor, paddle, Rushton, Cowles, and others. Shaft diameter is 0.5”. A “pool cue” type interchangeable shaft option is available to accommodate simple changes in shaft lengths for different vessels, and to allow for impellers to be welded to shafts and polished, without seams, for maximum sanitary requirements. All mixers are equipped with speed controllers. AC motor powered mixers are supplied with VFD speed controllers with calculated RPM indication; optional tachometer sensors also available for exact shaft RPM indication for any AC or DC motors and air motors. Electric motors and/or controllers are available for general, washdown, Div 1, Div 2, ATEX and other classifications.



316-L stainless steel is standard, Hastelloy or other alloys or coatings optional. Elastomers are Kalrez for greatest possible ranges of chemical solvent compatibility, pH and temperature extremes. Standard wetted metal finish is better than 32 Ra, with optional mechanical and electropolishing to better than 8 Ra. Application-dependent operating ranges are from: 0.01 torr vacuum to 150 psi pressure, -40 to 250° C temperature, maximum speed choices of 1000, 500, 250, 125, 60, 30 RPM.

A Teflon lip seal protects the space between the mechanical seal and the two sets of permanently lubricated and shielded ball bearings. Side ports enable unpressurized cooling or inert blanketing above the mechanical seal. Standard main seal is a single mechanical, dry running, specially pressure balanced type with 316L, Kalrez, carbon, and tungsten carbide materials. Options include double mechanical type for greater speed and pressure use, or internal steam sterilization. The standard mounting is 1-1/2 sanitary clamp type, alternates also available.

Pope’s knowledgeable staff offers application assistance to clients seeking application-specific optimization and/or maximum versatility. In addition to mixers, Pope provides pressure vessels ranging from simple portable containers to blenders, reactors, homogenizers, crystallizers, fermenters, Nutsches, distillation/evaporators, to skid-mounted, fully turnkey PLC operated multistage processing systems.

Pictured: Pope 700 series mixers on a vessel, and the 700 & 800 series mixers.