Paddle mixer PPD

horizontalbatchsolid/liquid

Overview
The PPD Series vacuum paddle mixer-dryer is a jacketed, vacuum-rated horizontal vessel with a slow-turning paddle agitator designed to dry filter cakes, sludges, wet granules and battery materials. Hollow heated paddles and a hollow heated shaft increase effective heated surface, improving drying rate versus jacket-only designs. Typical applications include heat-sensitive products and processes requiring solvent recovery.

How it works — The Mixing Action

• Gentle bed turnover: wide, low-speed paddles lift and fold the full cross-section without crushing; suitable for free-flowing powders to sticky cakes across the drying curve.
• Heated shaft & paddles: thermal fluid circulates through the hollow shaft and paddle faces and the jacket, increasing heated area per litre (up to +90%) and reducing cycle time.
• Phase-change tolerance: paddle geometry maintains torque and renews wall contact during the sticky transition where tray and thin-film dryers may stall.

Fit — Where the PPD Series Earns Its Place
Strengths

• Highest heated-surface-to-volume ratio of any horizontal vacuum dryer (hollow shaft & paddles).
• Handles wet-to-dry phase change without stalling.
• Robust drive sized for sticky-transition torque reserve.
• Full-opening doors or bomb-bay discharge options for cleaning access.
• CIP spray bars and ATEX/inert-loop execution available.

Typical Duties

• Filter cake and centrifuge cake drying.
• Battery precursor and cathode material drying with NMP recovery.
• Chemical intermediates, pigments and catalysts.
• Sludge conditioning and solvent stripping.
• API and fine-chemical final drying.

Industries

• Specialty chemicals.
• Battery & energy materials.
• Pharmaceuticals & APIs.
• Food ingredients.
• Environmental / recycling.

Vacuum Advantage — Mix, Dry, React — One Vessel, Under Vacuum
Operation under reduced pressure (typical range below) lowers boiling points of water and solvents, enabling drying of heat-sensitive materials and efficient solvent recovery. Standard engineering includes ASME jackets, vacuum-rated bodies, closed-loop solvent recovery (condenser, receiver, cold trap), nitrogen back-fill for oxygen-free processing, product-temperature control and full batch data logging. Machines are validated on customer material prior to order and FAT-tested against agreed cycle criteria.

Additional Product Notes

• Solvent recovery: condenser, receiver and cold trap recover solvents as liquids; NMP recovery is standard for battery duties.
• Atmospheric (non-vacuum) configurations available with same geometry and jacket options.
• Quotations based on heated area per litre, jacket and shaft fluid temperatures, evaporation rate at required vacuum, and torque reserve through sticky phase; pilot trials validate cycles.

Technical data / specifications

• Series: PPD Series (vacuum paddle mixers / dryers).
• Heated area increase vs jacket only: up to +90% (hollow shaft & paddles).
• Operating vacuum: 10 – 200 mbar (typical).
• Final moisture achievable: < 0.1% w/w (typical).
• Typical product temperature during drying: 30 – 50 °C (typical).
• Heat transfer: jacket + hollow shaft + heated paddle faces (thermal fluid circulation).
• Solvent recovery components: condenser, receiver, cold trap (liquid recovery).
• Options: CIP spray bars, ATEX / inert-loop execution, full-opening doors, bomb-bay discharge.
• Construction standards: ASME jackets; vacuum-rated bodies.
• Controls & validation: product-temperature control, full batch data logging, validated drying curve on trial, FAT tested.
• Drive: robust drive engineered to supply torque reserve through sticky transition phase.