A chemical plant installs a new granulator to produce granular for pharmaceutical a. purposes. The process is called granulation, in which the powder particles are made to adhere to each other, resulting in larger and multi-particle entities. In this process, the fresh feed (wet solid) contains 60 wt% water is mixed with recycled dry solid to reduce the water content to 40 wt% before being admitted into the granulator. The solids are then fed to a drier where they are contacted with dry air initially containing 0.25% water by mass. In the dryer, the air absorbs moisture and leaves with a moisture content of 8 wt%. The solids leaving the dryer contain 15 wt% water before being partially recycled to the fresh feed. As a process engineer, sketch a process flowchart/diagram with complete labelling and perform a degree of freedom analysis for the overall, individual units, mixing and splitting points. Then, determine the amount of recycled solids prior to mixing with fresh feed and circulation rate of dry air in the dryer.
A chemical plant installs a new granulator to produce granular for pharmaceutical a. purposes. The process is called granulation, in which the powder particles are made to adhere to each other, resulting in larger and multi-particle entities. In this process, the fresh feed (wet solid) contains 60 wt% water is mixed with recycled dry solid to reduce the water content to 40 wt% before being admitted into the granulator. The solids are then fed to a drier where they are contacted with dry air initially containing 0.25% water by mass. In the dryer, the air absorbs moisture and leaves with a moisture content of 8 wt%. The solids leaving the dryer contain 15 wt% water before being partially recycled to the fresh feed. As a process engineer, sketch a process flowchart/diagram with complete labelling and perform a degree of freedom analysis for the overall, individual units, mixing and splitting points. Then, determine the amount of recycled solids prior to mixing with fresh feed and circulation rate of dry air in the dryer.
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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Transcribed Image Text:A chemical plant installs a new granulator to produce granular for pharmaceutical
a.
purposes. The process is called granulation, in which the powder particles are made
to adhere to each other, resulting in larger and multi-particle entities. In this process,
the fresh feed (wet solid) contains 60 wt% water is mixed with recycled dry solid to
reduce the water content to 40 wt% before being admitted into the granulator. The
solids are then fed to a drier where they are contacted with dry air initially containing
0.25% water by mass. In the dryer, the air absorbs moisture and leaves with a
moisture content of 8 wt%. The solids leaving the dryer contain 15 wt% water before
being partially recycled to the fresh feed.
As a process engineer, sketch a process flowchart/diagram with complete labelling
and perform a degree of freedom analysis for the overall, individual units, mixing and
splitting points. Then, determine the amount of recycled solids prior to mixing with
fresh feed and circulation rate of dry air in the dryer.
Expert Solution
Step 1
The degree of freedom is obtained from number of variable and its independent equation. The DOF must be zero for any chemical process. The component balance and overall balance are the independent equations. If DOF is greater than zero we fix few variables to reduce the DOF to zero.
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