Products Low Temperature Rotary Vacuum Drying Systems


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.


Features
Batch operations mainly for crystalline free flowing powders
Quick opening charging and discharge valves
Effective Dust collector system
Mechanical Seal for high vaccum applications
Easy to clean and maintain
Applications are bulk drugs, pharmaceuticals industries, for nylon chips, polymers & resins and other special applications
Used where particle size maintenance is desired


Options
Mechanical chopper arrangement for deagglomeration of lumps formed while drying
Arrangement for inert gas purging into dryer
Variable speed drive
Solvent recovery systems including condenser, receivers and vacuum systems
Instrumentation for control room operation/DCS systems
Clean room configuration available


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 pulveriser 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.

Dryers for sterile / clean room applications

Materials of Construction
Can be manufactured in all weldable materials, including carbon steel, all weldable qualities of stainless steels, nickel, hastelloy etc..
Rotocone Dryer - Technical Data
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 - Technical Data
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
Rotocone Dryer (V - Type Dryer) - Technical Data
Nominal Volume Charging Capacity RPM Power H.P. Space Requirement Dia.
A B C D
100 40 3 - 12 0.5 2400 1200 1600 420
300 120 3 - 12 0.5 2600 1500 2200 635
500 200 1.5 - 6 1.0 3200 1600 2400 760
1000 400 1.5 - 6 3.0 4200 2200 2800 1000
1500 600 1.5 - 6 5.0 4700 2300 3200 1100
2500 1000 1 - 4 5.0 5400 2700 3700 1400
5400 2160 1 - 3 7.5 6400 3200 5200 1600
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