Concentration Pot
Evaporation
1. Product Overview
The vacuum concentration pot (also known as a vacuum concentrator) concentrates liquid feed under reduced pressure at low temperature. The unit consists of a concentration tank body, condenser, vapor-liquid separator and receiver, and is widely used in the pharmaceutical, food and chemical industries for concentration, distillation and organic solvent recovery.
2. Working Principle
Feed liquid is charged into the concentration tank, where vacuum lowers the boiling point. Steam or thermal oil circulates through the jacket to heat the liquid. The evaporated solvent is condensed in the condenser and collected in the receiver, while non-condensable gases are drawn off by the vacuum pump. Once the target specific gravity is reached, the concentrate is discharged from the bottom.
3. System Classification
Table
| Type | Features | Application |
|---|---|---|
| Single-effect vacuum pot | Simple structure, batch operation | Small batch, multi-product |
| Double-effect concentrator | Energy-saving, continuous/semi-continuous | Medium-to-large scale |
| Spherical concentration pot | Uniform heating, good agitation | High viscosity, foaming materials |
| Heat-reflux extraction-concentration tank | Integrated extraction and concentration | Traditional medicine, natural products |
4. Detailed Technical Parameters —
4.1 Common Materials
Table
| Material | Application | Remarks |
|---|---|---|
| SUS304 / SUS316L | Product-contact parts | GMP compliant |
| Carbon steel | Support, shell | Anti-corrosion coated |
| Glass-lined | Strongly corrosive materials | Acid and alkali resistant |
4.2 Typical Specifications (QN series, subject to design)
Table
| Model | QN-300 | QN-500 | QN-700 | QN-1000 |
|---|---|---|---|---|
| Evaporation rate (kg/h) | 70 | 120 | 145 | 195 |
| Nominal volume (L) | 300 | 500 | 700 | 1000 |
| Heating area (m²) | 1.1 | 1.6 | 2.0 | 2.5 |
| Condensing area (m²) | 2.4 | 3.2 | 3.5 | 4.5 |
| Steam pressure (MPa) | 0.3 | 0.3 | 0.3 | 0.3 |
| Vacuum (mmHg) | 500~620 | 500~620 | 500~620 | 500~620 |
| Weight (kg) | 380 | 450 | 630 | 950 |
4.3 Design Conditions & Performance (double-effect reference)
Table
| Parameter | Specification |
|---|---|
| Design pressure (tank/jacket) | -0.1 MPa / 0.03 MPa |
| Operating pressure (tank/jacket) | -0.08 ~ -0.09 MPa / 0.3 ~ 0.4 MPa |
| Design temperature (tank/jacket) | 95 °C / 100 °C |
| Operating temperature (tank/jacket) | 65 ~ 85 °C / 95 °C |
| Heat exchange area (jacket) | 3.8 m² (reference) |
| Condenser heat exchange area | 12 m² (reference) |
| Surface roughness | Internal Ra ≤ 0.4 μm; external Ra ≤ 0.8 μm |
5. Electrical Parameters
(same as the MVR evaporator table)
6. Key Component Selection
Table
| Component | Common Brand / Material | Features |
|---|---|---|
| Concentration tank body | SUS304 / SUS316L | Jacket heating, elliptical or spherical heads |
| Condenser | SUS304 / Carbon steel | Shell-and-tube or coil type |
| Vapor-liquid separator | SUS304 | Prevents entrainment |
| Receiver | SUS304 | Collects condensate |
| Vacuum pump | Liquid-ring / rotary vane | Maintains system vacuum |
| Agitator (optional) | Anchor / paddle agitator | Prevents wall sticking, improves heat transfer |
7. Typical Applications
Pharmaceutical: Traditional medicine extracts, oral liquids, extract concentration
Food: Bone broth, sauce, syrup concentration
Chemical: Dye intermediates, organic solvent recovery
Cosmetics: Plant extract concentration
8. Design Standards & Certifications
Table
| Standard | Description |
|---|---|
| JB 20037-2004 (Vacuum Concentration Tank) | Pharmaceutical machinery industry standard |
| GB 150 (Pressure Vessels) | Pressure vessel design and fabrication |
| GB 5226.1 | Electrical safety of machinery |
| GMP | Good Manufacturing Practice |
| ISO 9001:2015 | Quality management system |
9. Optional Custom Configurations
Table
| Option | Details |
|---|---|
| Agitator type | Anchor, paddle, frame type; VFD speed control |
| Discharge mode | Bottom valve / side outlet |
| Filtration | Increased filtration area, quick-opening filter |
| CIP/SIP | Clean-in-place / steam-in-place |
| Insulation jacket | Aluminum silicate wool + SS cladding |
10. Warranty Terms
(same as for the MVR evaporator)
11. Packaging and Delivery
Table
| Item | Packaging |
|---|---|
| Concentration tank body | Tarpaulin wrap, naked or wooden skid |
| Condenser / receiver | Tarpaulin or wooden cases |
| Vacuum pump / valves / instruments | Wooden cases or waterproof packing |
| Container estimate | QN-1000 and below: approx. 1×20'GP; double-effect units approx. 1~2×40'HC |
12. Information Required for Inquiry
12. Information Required for Quotation: material name and properties, throughput (L/batch or kg/h), inlet concentration and target specific gravity, organic solvent content, maximum temperature for heat-sensitive products, agitation and CIP/SIP requirements, available steam parameters, power supply, delivery terms and destination port.