Question

The appearance, size, shape, density, and solubility of the final spray dried particle can be affected by % List

[A.] Nozzle pressure
[B.] Liquid viscosity
[C.] Surface tension
[D.] Nature of the solids
Choose the most appropriate answer from the options given below:

• A. A, B, and D only
• B. A, B, and C only
• C. A, B, C, and D
• D. B, C, and D only

Hint:

In spray drying, everything matters. The process variables (\textbf{nozzle pressure}), the feed properties (\textbf{viscosity, surface tension}), and the composition (\textbf{nature of solids}) all interact to determine the final powder's characteristics.

Answer 1

The Correct Option is C

Step 1: Examine the influence of each factor on the spray drying procedure.
A. Nozzle pressure: This directly influences atomization energy, thereby regulating initial droplet size. Reduced droplet size accelerates drying and yields smaller final particles.
B. Liquid viscosity & C. Surface tension: These liquid feed characteristics impede atomization. Increased viscosity and surface tension hinder the formation of small droplets, resulting in larger final particles.
D. Nature of the solids: The solid's composition (e.g., crystalline or amorphous), concentration, and characteristics determine particle formation during drying, affecting the final particle's density, morphology (e.g., hollow or solid), and solubility.Because these four elements substantially affect the resulting particle attributes, the encompassing response encompasses them all.