Deethenizer System Overview

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Questions and Answers

What is the purpose of the drain holes in the baffle?

To prevent liquid from becoming trapped on the baffle surface.

How are the P-361A/B-1 pumps powered?

They are gear-type pumps driven by the crankshafts.

What type of pumps are P-361A/B-2 and how do they differ from P-361A/B-1?

P-361A/B-2 are single stage centrifugal pumps used as backups for P-361A/B-1.

What is the function of the E-361A/B-1/2 lube oil coolers?

To cool the lube oil on the shell side with cooling water on the tube side. Signup and view all the answers

What contaminants do the F-361A/B-1/2 lube oil filters remove?

They remove contaminants from the lube oil. Signup and view all the answers

What is the primary function of the deethenizer reboiler?

To heat the contents of a fractionation column to facilitate boiling and vaporization. Signup and view all the answers

How does a kettle-type reboiler operate?

It has liquid from the tower fed by gravity, and heat is introduced to boil the liquid, producing vapor. Signup and view all the answers

What is the role of the internal demister pad in the recycle cylinder suction drum?

To knock out any entrained liquid from the vapor that may develop when the vapor is cooled. Signup and view all the answers

What type of compressors are C-360A/B?

They are single stage, double acting compressors. Signup and view all the answers

What is the design purpose of the tangential entry nozzle in the booster cylinder suction drum?

To aid in droplet disengagement and reduce liquid entrainment by creating cyclone action. Signup and view all the answers

What is the main function of the D-375 recycle cylinder suction drum?

To separate entrained liquid from the vapor during the cooling process. Signup and view all the answers

How is heat supplied to the deethenizer reboiler?

Heat is supplied by steam or a hot hydrocarbon stream circulating through the tube side. Signup and view all the answers

Why is a vortex breaker used at the bottom outlet of the booster cylinder suction drum?

To minimize the formation of vortexes that can lead to improper liquid flow and entrainment. Signup and view all the answers

What is the significance of the weir in the kettle-type reboiler?

It allows for controlled overflow of liquid as a product from the reboiler. Signup and view all the answers

What is the cooling method used in the deethenizer feed cooler?

It cools vapor on the shell side using cooling water on the tube side. Signup and view all the answers

What is the primary function of E-373 (Purge Gas Heater)?

To cool the ethylene vapor on the tube side using overhead vapor from D-370 (Deethenizer Reflux Drum) on the shell side. Signup and view all the answers

How does the E-370 (Deethenizer Condenser) function?

It cools and condenses overhead vapor from T-370 using propylene refrigerant from D-510. Signup and view all the answers

What is the purpose of D-370 (Deethenizer Reflux Drum)?

To separate liquid for reflux on T-370 from the non-condensed vapor. Signup and view all the answers

What is the significance of T-370 (Deethenizer) in the system?

It purifies recycled ethylene by removing butene and limiting ethane concentration. Signup and view all the answers

What is the role of D-362A/B (Deethenizer Feed Dryers)?

To remove moisture from T-370's lower feed stream to prevent hydrate formation. Signup and view all the answers

How does F-362 (Deethenizer Feed Filter) contribute to the deethenization process?

It removes molecular sieve fines from the feed stream to T-370. Signup and view all the answers

What type of pumps are P-370A/B (Deethenizer Reflux Pumps) and their operating characteristics?

They are single-stage centrifugal pumps driven by 7.5 HP induction electric motors. Signup and view all the answers

Study Notes

Deethenizer System Overview

The Deethenizer System is a crucial part of an ethylene plant, designed to purify recycled ethylene by removing butene (C4) and limit ethane concentration in the ethylene feed to the reactors.
T-370 (Deethenizer) is the main component of the system, a 42”D x 50’5”L tower equipped with full cross flow valve trays.
The numbering system for the tower trays starts at tray 1 at the bottom and progresses up to tray 22 near the top.
D-370 (Deethenizer Reflux Drum) is a 5’D x 12’L drum installed to separate liquid used as reflux for T-370 from non-condensed vapor.

Deethenizer System Components

E-373 (Purge Gas Heater): A shell and tube exchanger that cools ethylene vapor on the tube side using overhead vapor from D-370 on the shell side.
E-370 (Deethenizer Condenser): Another shell and tube exchanger that condenses overhead vapor from T-370 on the tube side using propylene refrigerant from D-510 on the shell side.
D-362A/B (Deethenizer Feed Dryers): Two dryers remove moisture from T-370’s lower feed stream to prevent hydrate formation and deactivate the catalyst.
F-362 (Deethenizer Feed Filter): A cartridge type filter that removes molecular sieve fines from the feed stream to T-370.
P-370A/B (Deethenizer Reflux Pumps): Single stage centrifugal pumps driven by 7.5 HP motors that circulate reflux to T-370.
E-375 (Deethenizer Reboiler): A shell and tube exchanger that heats T-370 bottoms using 100 psig steam.
D-375 (Recycle Cylinder Suction Drum): A 3’6”D x 8’L drum equipped with an internal demister pad to separate entrained liquid from vapor.

Deethenizer System Auxiliary Components

D-360 (Booster Cylinder Suction Drum): A 2’6”D x 7’8”L drum with a demister pad to separate entrained liquid from the two-phase stream entering from E-351 and the vapor recycle stream from the Debutenizer System.
P-360A (D-360 Condensate Pump): A positive displacement pump routing condensate from D-360 to T-350.
C-360A/B (Booster/Recycle Compressors): Single stage, double acting compressors that compress vapor from D-360 to a pressure suitable for feeding T-370.
D-363A/B-1 to D-363A/B-8 (Booster/Recycle Suction & Discharge Bottles): A series of bottles used to manage the flow and separation of vapor in the compressor system.
E-360 (Deethenizer Feed Cooler): A shell and tube exchanger that cools vapor on the shell side using cooling water on the tube side.
D-361 (Deethenizer Drier K.O. Drum): A 2’6”D x 8’L drum with a demister pad to remove entrained liquid from the vapor stream.

Compressor System Auxiliary Components

P-361A/B-1 (C-360A/B Main Lube Oil Pumps): Gear-type pumps driven by the crankshafts to provide lubrication for C-360A/B.
P-361A/B-2 (C-360A/B Auxiliary Lube Oil Pumps): Single stage centrifugal pumps used as backup for P-361A/B-1.
E-361A/B-1/2 (C-360A/B Lube Oil Coolers): Shell and tube exchangers to cool lube oil using cooling water.
P-362A/B (Lubricator Pumps for C-360A/B): Camshaft driven pumps that route lubricating oil to the piston packing, tail rod packing, and cylinders of C-360A/B.
F-361A/B-1/2 (C-360A/B Lube Oil Filters): Filters designed to remove contaminants from the lube oil.

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Description

Explore the essential components and functionalities of the Deethenizer System used in ethylene plants. This quiz covers the main unit T-370, the Deethenizer Reflux Drum, and the associated heat exchangers. Test your knowledge on how these elements work together to purify recycled ethylene and enhance reactor efficiency.