20 Questions
What is the definition of filtration?
The separation of solid from a fluid or gas by means of a porous medium
When is the term 'clarification' applied in the context of filtration?
When the solids do not exceed 1% and filtrate is the primary product
What is the term used for the suspension of solid and liquid to be filtered?
Slurry
What are some characteristics of the slurry that can affect filtration according to Dr. Radwa Mahrous?
Density, viscosity, and corrosiveness
What is the filter medium used to retain the solid called?
Filter medium
What is the primary principle of surface filtration?
Pores or holes in the medium prevent the passage of solids
What is the equation for the rate of flow in filtration, based on Darcy's law?
Rate = permeability coefficient * surface area / pressure differential
How does the area of filter medium impact the volume of filtrate flowing from the filter?
Increasing area of filter medium increases the volume of filtrate
How does the permeability coefficient affect the rate of filtration?
Increasing permeability coefficient increases the rate of filtration
What factor is proportional to the rate of filtration in relation to pressure?
Rate of filtration is proportional to the pressure drop
Filtration is the process of separating gas from solid by means of a porous medium.
False
Filtration may also be defined as a unit operation in which feed or slurry is forced through a porous medium on which solids are dissolved.
False
The term 'filtrate' refers to the accumulation of solids on the filter.
False
Cake formation is the process known as cake formation when the aim of the filtration process is to obtain the liquid filtrate.
False
Filtration is not typically used for sterilization of solutions that are chemically or physically unstable under heating conditions.
False
Increasing the thickness of the cake will increase the rate of filtration.
False
The permeability coefficient is affected by the surface area of the particles and the porosity of the cake.
True
The total volume of filtrate flowing from the filter will not be affected by the area of the filter medium.
False
In cake filtration, the filtration is carried out by solids deposited as a clear filtrate.
False
The rate of filtration is not proportional to the pressure drop.
False
Study Notes
Filtration Definition and Process
- Filtration is the process of separating solid from liquid or gas using a porous medium.
- Filtration is a unit operation where a feed or slurry is forced through a porous medium, separating solids from liquids.
Clarification and Filtration
- The term "clarification" is applied when the goal of filtration is to obtain a clear liquid.
Slurry Characteristics
- The characteristics of the slurry (suspension of solid and liquid to be filtered) that affect filtration include factors identified by Dr. Radwa Mahrous.
Filter Medium
- The filter medium used to retain solids is called the filter cake.
Surface Filtration
- The primary principle of surface filtration is the retention of solids on the filter medium surface.
Darcy's Law and Filtration Rate
- The rate of flow in filtration is based on Darcy's law, which can be expressed as an equation.
- The rate of filtration is proportional to the pressure drop and inversely proportional to the viscosity of the fluid.
Filter Medium Area and Filtration Rate
- An increase in the area of the filter medium will increase the volume of filtrate flowing from the filter.
Permeability Coefficient
- The permeability coefficient affects the rate of filtration and is influenced by the surface area of particles and the porosity of the cake.
Cake Formation and Filtration
- Cake formation is the process of solids accumulating on the filter medium during filtration.
- Increasing the thickness of the cake will decrease the rate of filtration.
Sterilization and Filtration
- Filtration is not typically used for sterilizing solutions that are chemically or physically unstable under heating conditions.
Test your knowledge on filtration in pharmaceutical technology with this quiz. Learn about the separation of solid from a fluid or gas by means of a porous medium, important terms, and unit operations involved in filtration.
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