Polyvinylpyrrolidone (PVP) is a polymer product used as a binding agent in pharmaceutical applications as well as in personal-care items such as hairspray. In the manufacture of PVP, a spray-drying process is used to collect solid PVP from an aqueous suspension, as shown in the flowchart on the next page. A liquid solution containing 65 wt% PVP and the balance water at 25°C is pumped through an atomizing nozzle at a rate of 1500 kg/h into a stream of preheated air flowing at a rate of 1.57 × 104 SCMH. The water evaporates into the stream of hot air and the solid PVP particles are suspended in the humidified air. Downstream, the particles are separated from the air with a filter and collected. The process is designed so that the exiting solid product and humid air are in thermal
equilibrium with each other at 110°C. For convenience, the spray-drying and solid-separation processes are shown as one unit that may be considered adiabatic.
Polymer solution25°C | |||
Humid Air | |||
1IO°C | |||
SPRAY | |||
Air, | DRYER and | Dry solid polymer | |
SOLID | |||
SEPARATOR | 110°C | ||
- Draw and completely label the process flow diagram and perform a degree-of-freedom analysis.
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