Drying is an important chapter in pharmaceutical in engeneering plays an important role in medicinal industries. quick overview......

1. ➤Drying ....
Name: Akanksha balasaheb puri
Roll No: 75
Sub: Pharmaceutical engineering

2. ➮Contents….
Introduction
Defination
Application
Classification
Drum dryer

3. Drying :
➢Defination:
Drying is defined as the final removal of liduid from
solids by vapourasation with the aid of heat.
Drying is commonly is the last stage in the
manufacture process .
The liquid medium may be removed from the solids
by the filter press and or thermally by the
vapourisation.

4. ➣Drying is possible when the environment is
unsaturated with the water vapour
➣Drying is important to avoid or eliminate the moisture
content which may lead to corrosion and decrease the
product stability.
To improve or keep the good properties of the materials.
E.g. Flowability or compressibility
➣It is the final step in the evaporation, filtration n
crystallization.

5. ➧Application:
Preparation of bulk drug
Preservation of drug product
Improve the characterstics
Improve the handling

6. Classification of dryers
Tray dryer Drum dryer Fludised bed dryer Spray dryer
Freez dryer Vaccume tumble Vertical dryers Flash dryer
dryer
Dryers
Static bed Moving bed Fludised Pneumatic

7. 1.Drum dryer
Principle:
Heated hollow metal drum rotate on its longitudinal axis ,
which is partialy dipped in the solution to be dried.
The solution is carried out as a film on the surface on the
drum and dried to form a layer , while drum is rotating.
Construction:
It consist of horizontally mounted hollow steel drum
having 0.6 to 3m diameter & 0.6 to 4 m length.

8. ➣Polished surface
➢Feedpan is placed below the drum that partially
dipped into the feed.
➣One side spreader and on another side doctors knife.
Storage bin connnected to the knife.

9. Working:
➛Steam is passed inside drum.
➛Drying capacity~ surface area of drum.
➛1 to 10 revolutions/min
➛Material adhere to pan, form a thin layer on the drum
surface during rotation.
➛Material is dry during rotation.
➛Dry material is scrapped by doctors knife moved in
the bin.

10. Applications:
Use for the drying of slurries, suspentions.
Also use for the dring of starch product , insecticide, DDT and Ferrous salt
etc…
Advantages:
Less time is required
Suitable for heat sensitive material
Disadvantages:
High maintainance cost
Skilled perators are required.

11. Thank you!