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?

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

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

<p>They remove contaminants from the lube oil.</p> Signup and view all the answers

What is the primary function of the deethenizer reboiler?

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

How does a kettle-type reboiler operate?

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

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

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

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

<p>They are single stage, double acting compressors.</p> Signup and view all the answers

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

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

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

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

How is heat supplied to the deethenizer reboiler?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

<p>They are single-stage centrifugal pumps driven by 7.5 HP induction electric motors.</p> 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.

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