03: A wet solid is to be dried in a tray dryerunder steady state conditions from a freemoisture content of X₁ =0.4 kgH₂O/kg drysolid to X2 0.02 kgH₂O/kg dry solid. Thedry solid weight is 99.8kg dry solid and thetop surface area for drying is 4.645m². thedrying rate curve can be represented byFigure below.a- Calculate the time for drying usinggraphical integration in the falling rateperiod.b- Repeat but use a straight line throughthe organic for the drying rate in thefalling rate period.Drying rate200.80.4FallingrateConstantrate0.1 0,2 0.3 0.4 0.5 0.6Free moisture X (kg H, O/kg dry solid)

Step 1:Here's how to solve it:Define the variables:X1: Initial free moisture content (kg H2O/kg dry…

Answered: 03: A wet solid is to be dried in a…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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1. During a carburization process for the surface treatment of steel, how much processing time in minutes is needed to increase the carbon content at 0.4% up to 0.85% at (a) 0.5 mm and (b) 1 mm below the surface? Assume carbon content at the surface is 0.95 % and steel inside has background carbon of 0.1% and diffusivity is 1.1 x 10-13 m²/s.
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.
Heat transfer through a composite wall is calculated as a series of ________ (use plural form)
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?
Calculate using the data below the % ash of the sample (dry basis). Weight of sample before drying: 12.6758 g Weight of the sample after drying: 9.5672 g Weight of the sample after ashing: 1.9875 g Round off to 4 decimal places and do not include units.
Kneading kneads 50 kg of dough 25 C with a mixing motor at 0.75 KW for 20 minutes. At this distance, heat equal to 300 j is expelled from the dough container. If the heat capacity of the dough is 0.8.C, calculate the final kj jg temperature of the dough.
Deterioration must be strictly avoided when drying pharmaceutical products. Furthermore, such products are often produced from a nonaqueous solvent such as ethanol, methanol, acetone, etc. Explain why a closed-cycle spray dryer using nitrogen is frequently a good choice of dryer

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