fluidized bed drayer ppt

fuidized bed drayer ,priciple function .advantaged disadvantages

1. DEPARTMENT OF PHARMACEUTICAL SCIENCES Fluidized bed drayer Presentation on Presented by: Deepak Thakur B. Pharm III Sem Y17150114 Submitted to: Mr. Vikash pandey Sir Research scholar, DOPS Dr. Hari Singh Gour Vishwavidyalaya , Sagar (MP) Session 2018-19 (A Central University)

2. content INTRODUCTION PRINCIPLE CLASSIFICATION OF FLUIDIZED BED DRAYER CONSTRUCTION WORKING PARAMETER THAT CAN BE CONTROLLED ADVANTAGES DISADVANTAGES PHARMACEUTICAL APPLICATIONS

3. Fluidized bed drayer INTRODUCTION Fluidized bed drayer Fluid bed drying is most widely used technique for drying. and in pharmaceutical field mainly for powders and granules. The direct contact between particles and air/gas is possible in fluid bed system. Here any type of inert gas or air is used. They can be designed in either batch or continuous type fluid bed dryer

4. The equipment works on a principle of fluidization. In fluidization process, hot air is introduced at high pressure through a perforated bed of moist solid particulate.   The wet solids are lifted from the bottom and suspended in a stream of air (fluidized state). To attain this state the requirement is that the velocity of the air/gas should be grater than the velocity of settling particles . Heat transfer is accomplished by direct contact between the wet solid and hot gases. Princile of fluidized bed drayer

5. The vaporized liquid is carried away by the drying gasses. .  The hot gas surrounding every granule to completely dry them. Thus, material or granules are uniformly dried.

6. Classification of fluidized bed drayer On the basis of processing batch processing fluidized bed drayer

7. continous processing fluidized bed drayer

8. CONSTRUCTION of fluidized bed drayer The dryer is made of stainless steel or plastic. A detachable bowl is placed at the bottom of the dryer, which is used for charging and discharging. The bowl has a perforated bottom with a wire mesh support for placing materials to be dried.

9. A fan is mounted in the upper part for circulating hot air. Fresh air inlet, prefilter and heat exchanger are connected serially to heat the air to the required temperatures. The temperature of hot air and exit are monitored. Bag filters are placed above the drying bowl for recovery of fines.

10. WORKING of fluidized bed drayer The main principle involved in fluidized bed dryer is “Fluidization”. In this state the granules are completely suspended in a stream of hot air which is being supplied from the bottom of the container.

11. WORKING…………..

12. Fluidization produces full agitation of solid particles and since each particle gets surrounded by hot air, heat transfer is extremely high and uniform. The product is dried fast without appreciable loss of heat. Filter bags prevent particles escaping from the dryer. The material is left for some time in the dryer for reaching ambient temperature. The end product is free flowing. WORKING………..

13. Parameter that can be controlled in fluidized bed drayer In order to improve operation, efficiency, and reproducibility of a fluidized bed dryer, some parameters need to be controlled. Temperature Humidity Moisture content of the feed material. Feed rate/batch size. Product moisture content. Particle size and diameter.

14.  Fluidized bed dryer requires less time to complete drying. i.e., 20 to 40 min. Hot spots are not observed in the dryer, because of its excellent mixing and drying capacities. The thermal efficiency is 2 to 6 times greater than tray dryer. It facilitates the drying of thermolabile substances , since the contact time for drying is short. Handling is Easy and Less Labor Intensive Advantages of fluidized bed drayer

15. disAdvantages of fluidized bed drayer Many organic powders develop electrostatic charges during drying which can be avoided by efficient electrical earthing of the dryer. The turbulence of the fluidized state of granules may cause attrition of some materials resulting in production of fines which can be avoided by using suitable binding agent. high energy consumption. Requires gas handling Poor fluidization and low flexibility especially if the feed is too wet. Drying Sticky Material is Quite Difficult

16. It is used for the popularly drying of the granules in the production of the tablets. It is used for the three operation such as mixing, granulation and drying. It is modified for coating of granules. pharmaceutical applications