Pharmaceutical Technology I (PT709) Fall 2023-2024 Dr.Radwa Mahrous Filtration Quiz

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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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