What are the key factors that influence the drying rate of solid particles in a rotary dryer, and how do they impact the overall efficiency of the drying process?

b) A complete drying experiment for two different materials (sand and minced meat) was conducted in the laboratory. The results of drying rate for both materials are as shown in Figure 3. Compare and explain the drying rate behavior for sand and minced meat. Drying rate Sand Minced meat Drying time Figure 3 Relation between drying rate and drying time

Styrene is manufactured by catalytic dehydrogenation of ethylbenzene followed by vacuum distillation to separate styrene from unreacted ethylbenzene. Typical feed conditions for an industrial distillation unit are 77°C (350.6 K) and 100 torr (13.33 kPa). Based on the properties of these substances, and assuming that the hypothesis of ideal gas and ideal liquid solution are suitable for this system at low pressure, estimate the values of the equilibrium ratios K for each component and the relative volatilit

During flour milling, wheat grains are taken at a rate of 4 t/h and goes to the cleaning system. As a result of cleaning, 2% is removed in the form of foreign material and chaff. The cleaned grain is then tempered (moisture adjusted from initial to higher moisture to make the bran layer rubbery) before they pass through roller breaks. If the initial moisture content of of the grain is 13.2%, determine the weight of tempered grains if the tempering moisture is 14.5%. Determine the amount of water adsorbed during tempering per tonne of tempered grain. (Moistures are given in wet basis). Also, determine the amount of foreign material/chaff generated per tonne of tempered grain.

17.5. Identify the following polymer processing techniques as either: (i) Continuous (able to operate for very long periods of time as long as enough polymer is supplied), (ii) Batch or semi-continuous (able to make one material at a time, or possibly operate in a cyclic or fashion for a long time with small breaks between processing) THERMAL EXTRUSION CASTING TO FORM A THERMOSET POLYMER BLOW MOLDING MELT SPINNING OF FIBERS THERMOFORMING - INJECTION MOLDING - BLOW EXTRUSION - CALENDERING - COMPOUNDING - ROTATIONAL MOLDING 17.6. You work at a plant that makes poly(ethylene terephthalate), PET, bottles using blow molding, but the production line is having a problem with lots of rejected bottles, which must be ground up and recycled. The rejected bottles sometimes have holes in the threaded part at the top of the bottle (where the screw-cap goes), or this part is often too thin and not rigid enough for the screw cap to fit snugly. A. Give a likely explanation of what is causing the…

In the dryer models for a belt dryer with throughcirculation and a direct-heat rotary dryer, is the rate of drying based on heat transfer or mass transfer? Why?

Under what drying conditions is the moisture-evaporation temperature equal to the wet-bulb temperature?

8. draw a diagram of the simple distillation system used to purify chloride and label each piece

5. What materials can be used to pack a bed?6. What is the stirring process?7. Mention some equipment used for mixing

Which of the following processing methods would you use for compounding a polymer with colorants and stabilizers a) injection moulding b) thermoforming c) single-screw extrusion d) twin-screw extrusion e) transfer moulding.