In industries where product purity, solvent recovery, and low‑temperature processing are mission‑critical, the Double Cone Rotary Vacuum Dryer has emerged as the preferred drying solution. Combining mixing and drying within a single closed system, this advanced equipment is widely adopted in pharmaceutical, chemical, food, and battery material processing.
This article provides an in‑depth look at its working principle and the core technical advantages that make it an indispensable asset for modern manufacturing.
A Double Cone Rotary Vacuum Dryer is a new‑generation drying device that operates under vacuum conditions while the double‑cone vessel rotates continuously. This design ensures gentle tumbling of materials and uniform heating, achieving rapid, consistent drying without thermal degradation.
The equipment uses indirect heating through a jacketed vessel. Heat is transferred from the jacket to the inner shell, and the vacuum system lowers the boiling point of solvents, enabling efficient drying at low temperatures—typically between 20°C and 160°C.
The drying process follows three simultaneous and continuous stages:
Heat Transfer
A heating medium (hot water, low‑pressure steam, or thermal oil) circulates through the sealed jacket, transferring heat to the material via the inner shell. The jacket design pressure is typically ≤0.3 MPa, ensuring safe and efficient heat transfer.
Continuous Mixing
The vessel rotates slowly (typically 4–6 RPM), causing the material to tumble and constantly renew contact with the heated wall surface. This continuous motion maximizes heat exchange efficiency and ensures every particle is evenly exposed to heat. The tumbling action also prevents material caking and promotes uniform drying.
Vacuum Evaporation
Under vacuum (design pressure ‑0.1 to 0.15 MPa), the vapor pressure drops significantly, allowing surface moisture to evaporate at much lower temperatures. The evaporated solvent is drawn out by a vacuum pump and can be recovered through a condensing system.
These three processes occur simultaneously and continuously, achieving drying in significantly shorter time compared to conventional dryers.
Low‑Temperature Drying Capability
Because the system operates under vacuum, drying occurs at temperatures as low as 20°C to 85°C inside the tank (jacket up to 140°C). This makes it ideal for heat‑sensitive biochemical products, active pharmaceutical ingredients (APIs), and materials that cannot withstand high temperatures.
Superior Thermal Efficiency
Thermal efficiency is more than twice that of ordinary dryers. The combination of indirect heating and continuous tumbling ensures maximum heat utilization, reducing energy consumption and operating costs.
No Product Contamination
Indirect heating means the material never comes into direct contact with the heating medium. Additionally, the closed system protects sensitive materials from oxidation and contamination. All internal and external surfaces are polished (SUS304/316L stainless steel) to eliminate dead corners, making cleaning easy and meeting strict GMP requirements.
Solvent Recovery System
The vacuum system, combined with a low‑temperature condenser, allows efficient recovery of organic solvents. This saves production costs, reduces environmental pollution, and is particularly valuable when processing volatile or toxic materials.
Reliable Drive & Sealing
The equipment uses belt‑chain dual elastic coupling, ensuring stable operation and excellent concentricity between the two shafts. Rotary joints from U.S. technology ensure reliable sealing for both heat medium and vacuum systems, minimizing leakage risks and maintenance needs.
Customizable for Sticky Materials
For adhesive or sticky raw materials, manufacturers can specially design a "copy board" mechanism or install balls inside the tank to prevent material agglomeration. This ensures smooth processing even for challenging products.
GMP‑Compliant Design
The equipment is designed to comply with GMP requirements for pharmaceutical and food applications. Highly polished surfaces, easy cleaning, and closed operation prevent cross‑contamination—essential for multi‑product facilities.
| Model | Total Volume (L) | Working Volume (L) | Heating Area (m²) | Speed (rpm) | Power (kW) | Rotary Height (mm) |
| SZG‑100 | 100 | ≤50 | 1.16 | 4–6 | 0.75 | 1750 |
| SZG‑350 | 350 | ≤175 | 2.00 | 4–6 | 1.1 | 2100 |
| SZG‑500 | 500 | ≤250 | 2.63 | 4–6 | 1.5 | 2250 |
| SZG‑750 | 750 | ≤375 | 3.50 | 4–6 | 2.0 | 2490 |
| SZG‑1000 | 1000 | ≤500 | 4.61 | 4–6 | 3.0 | 2800 |
| SZG‑1500 | 1500 | ≤750 | 5.58 | 4–6 | 3.0 | 2940 |
| SZG‑2000 | 2000 | ≤1000 | 7.50 | 4–6 | 4.0 | 2990 |
| SZG‑3500 | 3500 | ≤1750 | 9.60 | 4–6 | 5.5 | 3490 |
Key Parameters: Vessel design pressure: ‑0.1 to 0.15 MPa | Jacket design pressure: ≤0.3 MPa | Tank operating temperature: ≤85°C | Jacket temperature: ≤140°C
The Double Cone Rotary Vacuum Dryer is widely used for drying, mixing, and concentrating powder, granular, and fibrous materials in:
Pharmaceutical Industry – Drying of biochemical products, active pharmaceutical ingredients (APIs), and heat‑sensitive compounds
Chemical Industry – Drying of catalysts, pigments, dyes, and intermediates—especially those prone to oxidation or with strong irritancy
Food Industry – Low‑temperature drying of food additives, flavorings, and nutritional ingredients
Battery Materials – Drying of lithium iron phosphate, lithium titanate, and other cathode/anode materials where moisture control is critical
Solvent Recovery Applications – Processes requiring recovery of volatile organic solvents
For heat‑sensitive and high‑value products, the Double Cone Rotary Vacuum Dryer offers unparalleled advantages:
Preserves product quality – Low‑temperature drying prevents degradation of sensitive compounds
Reduces processing time – Simultaneous mixing and drying significantly shortens batch cycles
Enables solvent recovery – Closed‑loop system captures valuable solvents for reuse
Ensures batch‑to‑batch consistency – Uniform heat distribution and gentle tumbling guarantee reproducibility
Every process has unique requirements. Manufacturers offer flexible customization to meet specific needs:
Material of Construction – SUS304, SUS316L, Titanium, or Carbon Steel
Heating Source – Steam, hot water, thermal oil, or electric heating
Control System – Stepless speed regulation and constant temperature control (SZG‑A series)
Capacity – From 100L to 6000L total volume
Special Features – Anti‑stick design, enhanced mixing blades, or automatic data recording
The Double Cone Rotary Vacuum Dryer represents a proven, efficient solution for drying heat‑sensitive and high‑value materials across multiple industries. Its unique combination of vacuum operation, continuous mixing, and indirect heating delivers superior drying results while protecting product integrity.
Whether you are processing APIs in pharmaceuticals, catalysts in chemicals, or advanced materials in battery production, this equipment offers the reliability, efficiency, and quality assurance that modern manufacturing demands.
Address:China,Yanjin county forest park gate to the west 1000 meters north road.
Online Chat 
Email