These three batch type of Vacuum Dryers work on exactly the same principle and belong to the same family. They are, however, suitable for only free flowing materials, which are readily converted from slurry or wet cake to free flowing powder without exhibiting sticking or lump forming properties during the course of drying operations.
All the three Dryers are of the Rotary type, having inclined indirectly heated surfaces. The rotary action permits gentle folding and mixing of the material thereby enabling it to come in contact with the indirectly heated surfaces resulting in vapourisation of the moisture in the wet particles. The vapour is sucked out by vacuum inside the dryer. Operating in a vacuum reduces the boiling point of the solvent.
Consequently the evaporation is faster and takes place at a much lower temperature than would be applicable at atmospheric temperature. Vapour from the Dryer passes under vacuum through a Cyclone Separator into a condenser, where it is condensed and is eventually collected in a Receiver. Recovery of the solvent is almost 100 per cent.
Standard Features
- Double wall construction, suitable for use with steam, hot water / hot oil as heating media. Loading wet cake / slurry is through a cover, with a quick opening device. Discharge opening consists of a vacuum tight valve. Provision of an internal filter to ensure minimum entrainment of dry product under vacuum.
- Where required an external in-line filter or Cyclone is provided to prevent entry of dry powder into the Condenser and Receiver. A Rotary Joint is provided at the Dryer End for inlet of heating medium into the Dryer jacket and for a return line for the same. Also provided in the bottom section is a nozzle connected to the Feeder Unit, and the wet cake entering the Drying Chamber is flash dried to a great extent, and most of the particles immediately get air-borne and move with the hot air, spinning upwards. Agglomerates, while going down are broken up by the shearing action of the agitator and become air borne. Larger particles fall into the pulverizer and the particle size is reduced.
- They also are then picked up by the rising stream of hot air. Design permits complete discharge of the dry product without any residue being retained. Vapour outlet end is provided with a specially designed external mechanical seal precluding the necessity of providing gland packing in the Dryer body.
Optional Features
- If dictated by process conditions, highly polished internal surfaces can be provided
- Variable speeds can be provided, if required
- Provision for measurement of product temperature can be provided, if required
- Choppers for breaking agglomerates into powder in final stages of drying can be provided
Application Data
- These Dryers are used for free flowing, temperature sensitive materials
- These Dryers are also used for drying expensive pharma materials where high degree of purity is required.
- Nitrogen blanketing can be provided in way of seals at charging and discharging points, for drying of highly explosive materials.
Materials of Construction: Can be manufactured in all weldable materials, including carbon steel, all weldable qualities of stainless steels, nickel, hastelloy etc.. Technical Data Rotocone Dryer
|
Nominal
Volume
|
Charging
Capacity
|
RPM
|
Power
H.P.
|
Space
Requirement
|
Dia.
|
|
A
|
B
|
C
|
D
|
|
1000
|
400
|
1.5 - 6
|
3.0
|
3650
|
2000
|
2000
|
1300
|
|
1500
|
600
|
1.5 - 6
|
3.0
|
3880
|
2400
|
2600
|
1500
|
|
2500
|
1000
|
1 - 4
|
5.0
|
4300
|
2700
|
2800
|
1650
|
|
4000
|
1600
|
1 - 4
|
5.0
|
4650
|
3100
|
3100
|
2000
|
|
6000
|
2400
|
1 - 3
|
7.5
|
5000
|
3700
|
3700
|
2250
|
|
8000
|
3200
|
1 - 2
|
10.0
|
5600
|
4200
|
4200
|
2500
|
Tumbling Dryer
|
Nominal
Volume
|
Charging
Capacity
|
RPM
|
Power
H. P.
|
Space requirement
|
Dia.
|
|
A
|
B
|
C
|
D
|
|
100
|
40
|
3 - 12
|
0.5
|
2450
|
1000
|
1600
|
500
|
|
300
|
120
|
3 - 12
|
0.5
|
2680
|
1250
|
1900
|
750
|
|
500
|
200
|
1.5 - 6
|
1.0
|
3100
|
1500
|
2200
|
900
|
|
1000
|
400
|
1.5 - 6
|
3.0
|
3700
|
1900
|
2350
|
1100
|
|
1500
|
600
|
1.5 - 6
|
5.0
|
3900
|
2100
|
2500
|
1200
|
|
2500
|
1000
|
1 - 4
|
5.0
|
4300
|
2600
|
3000
|
1500
|
|
4000
|
1600
|
1 - 4
|
5.0
|
5100
|
3100
|
3200
|
1700
|
|
6000
|
2400
|
0.75 - 3
|
7.5
|
5300
|
3500
|
3700
|
1900
|
|
8000
|
3200
|
0.75 - 3
|
10.0
|
5700
|
3700
|
3900
|
2100
|
V - Type Dryer
|
Nominal
Volume
|
Charging
Capacity
|
RPM
|
Power
H. P.
|
Space Requirement
|
Dia.
|
|
A
|
B
|
C
|
D
|
|
100
|
40
|
-
|
|
