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Question 9:

Why is it impossible to produce a 100% pure product using fractional distillation?

A - Because the process uses heat repeatedly on each tray, diminishing the purity of the overhead product B - Because the vaporization and condensing actions on the trays are not 100% effective. C - Because each time the vapours rise in the tower, the purity is decreased through condensation D - The more trays the fractionator contains, the lower the purity of the overhead product Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 10:

Bottom product is defined as:

A - The lighter hydrocarbon component(s) distilled from the feed B - The original feed mixture with the distillate removed C - The condensed product that is returned to the still as reflux D - The stream of hydrocarbons that enters the fractionation tower Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct

Question 1:

In a fractionating system used in a large sour gas plant, when a mixture of propane and butane is split in the depropanizer, the overhead product is:

A - Butane B - Propane C - Pentane D - Ethane Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 2:

When a system is designed to separate the components of a four-component mixture:

A - Two towers are required B - Four towers are required C - Three towers are required D - One tower is required Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 3:

In a gas plant, when discussing fractionation components, the common abbreviation used for octane is:

A - C8 B - C4 C - C3 D - C1 Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 4:

The de- isobutanizer tower is controlled by maintaining a temperature differential from the top to the bottom of the tower of:

A - 1 to 3 degrees C B - 5 to 9 degrees C C - 4 to 6 degrees C D - 4 to 7 degrees C Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 5:

When a system is designed to separate the components of a three-component mixture:

A - One tower is required B - Four towers are required C - Three towers are required D - Two towers are required Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 6:

In a gas plant, when discussing fractionation components, the common abbreviation for ethane is:

A - C4 B - C1 C - C2 D - C3 Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 7:

The de-isobutanizer is similar to other fractionators, however it is typically much:

A - Higher B - More densely packed C - Smaller D - More common Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 8:

With a mixture of C3, C4, and C5 in a two tower fractionation system, the bottom product off the depropanizer (first tower) is:

A - C4 B - C3 C - C4 and C5 D - C5 Correct Answer(s): C Marked as: Incorrect _______________________________________________

Question 9:

The de-isobutanizer is employed in a few installations to split isobutane (i-C4) from normal butane (n-C4) and requires very close pressure and temperature control. The tower is controlled by maintaining a temperature differential of _________ from the top to the bottom of the tower.

A - 2 to 4 degrees C B - 4 to 6 degrees C C - 6 to 8 degrees C D - 8 to 10 degrees C Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 10:

What happens when the de-ethanizer in a fractionation system is driven too hard?

A - The propane and butane are driven overhead B - Tthe propane becomes bottom product C - The propane and butane are contaminated with sulphur D - The mole sieve beds become fouled Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Question 1:

The de- isobutanizer tower is controlled by maintaining a temperature differential from the top to the bottom of the tower of:

A - 5 to 9 degrees C B - 1 to 3 degrees C C - 4 to 7 degrees C D - 4 to 6 degrees C Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

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