Quiz on Super Critical Fluid Dyeing

What is the primary solvent used in traditional textile dyeing processes?

• Ethanol

• Water

• Acetone

• Hexane

What is a significant environmental benefit of using supercritical carbon dioxide (CO2) in dyeing?

• Increased chemical waste

• Higher energy consumption

• Reduction of wastewater

• Increased water usage

What is the critical temperature of carbon dioxide?

• 50.0 °C

• 25.0 °C

• 40.0 °C

• 31.1 °C

Which of the following is NOT a characteristic of supercritical fluids?

• Solvent power similar to light hydrocarbons

• High diffusivity

• Intermediate properties between gas and liquid

• High viscosity

What is one of the main drawbacks of using supercritical CO2 for dyeing?

• Non-toxic nature

• High pressure and temperature requirements

• Easy handling

• Low cost

What is the primary advantage of supercritical CO2 in textile dyeing compared to conventional methods?

• Longer dyeing times

• No need for water

• Higher dyeing temperatures

• Increased dyeing waste

Which of the following fibers is NOT effectively dyed using supercritical CO2?

• Elastane

• Cotton

• Nylon

• Polyester

What is the pressure range that a high-pressure laboratory apparatus can handle for supercritical dyeing?

• 200-500 bars

• 500-1000 bars

• 0-100 bars

• 100-200 bars

What is the main reason for the textile industry's high water consumption?

• Limited dyeing options

• Water as a universal solvent

• High dyeing efficiency

• Low cost of water

What is the effect of increasing pressure on the solubility of solutes in supercritical CO2?

• Decreases solubility

• Increases solubility

• No effect on solubility

• Makes solutes insoluble