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Questions and Answers
Describe the purpose of routing the overhead vapor from D-330 through the tube side of E-373 before it reaches T-370. What is it being cooled by on the shell side of E-373?
Describe the purpose of routing the overhead vapor from D-330 through the tube side of E-373 before it reaches T-370. What is it being cooled by on the shell side of E-373?
The overhead vapor from D-330 is cooled in E-373 by the overhead vapor from D-370 (Deethenizer Reflux Drum).
Explain why the stream from D-380 is dried in D-362 A/B before being sent to T-370. What potential issues could arise if this stream wasn't properly dried?
Explain why the stream from D-380 is dried in D-362 A/B before being sent to T-370. What potential issues could arise if this stream wasn't properly dried?
The stream from D-380 is dried to prevent issues such as hydrate formation or corrosion within the Deethenizer (T-370). Moisture can cause operational problems.
Describe the path of the vapor from the top of T-370, including all equipment it encounters, until it returns to T-370 as reflux.
Describe the path of the vapor from the top of T-370, including all equipment it encounters, until it returns to T-370 as reflux.
The overhead vapor from T-370 goes to E-370 (Deethenizer Condenser), then to D-370, and finally back to T-370 as reflux via P-370 A/B (Deethenizer Reflux Pumps).
The bottoms of T-370 are routed to E-375. What heats the bottoms in E-375, and what is done with the overhead vapors from E-375?
The bottoms of T-370 are routed to E-375. What heats the bottoms in E-375, and what is done with the overhead vapors from E-375?
Describe what happens to any liquid that exits the bottom of D-375, and explain why it is routed to the specified location.
Describe what happens to any liquid that exits the bottom of D-375, and explain why it is routed to the specified location.
Flashcards
E-373 Function
E-373 Function
Cools overhead vapor from D-330 using overhead vapor from D-370.
E-370 (Deethenizer Condenser) Function
E-370 (Deethenizer Condenser) Function
Partially condenses the overhead vapor from T-370 (Deethenizer) using propylene refrigerant.
P-370 A/B (Deethenizer Reflux Pumps) Function
P-370 A/B (Deethenizer Reflux Pumps) Function
Provides reflux to the top of T-370 (Deethenizer).
D-375 (Recycle Cylinder Suction Drum) Function
D-375 (Recycle Cylinder Suction Drum) Function
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E-375 (Deethenizer Reboiler) Function
E-375 (Deethenizer Reboiler) Function
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Study Notes
- Overhead vapor from D-330 cools in E-373 via overhead vapor from D-370, then goes to T-370.
- A stream from D-380 recycles through C-360A/B, dries in D-362A/B, filters in F-362, then enters T-370.
- Overhead vapor from T-370 partially condenses in E-370 using propylene refrigerant from D-510.
- The partially condensed vapor goes to D-370.
- Liquid from D-370 returns to T-370 as reflux via P-370A/B.
- Most vapor from D-370 goes to D-375, with a small stream to E-373.
- Liquid from D-375's bottom goes to T-350, vapor from the top goes to C-360A/B.
- Vapor from C-360A/B joins T-370's overhead vapor, both going to E-370.
- T-370 bottoms heat in E-375 using 100 psig steam, and overhead vapors return to T-370.
- Liquid from E-375's bottom goes to T-380.
Equipment Descriptions
- Equipment descriptions provide details on size, shape, internals, and features.
E-373 (Purge Gas Heater)
- A shell and tube, U-tube heat exchanger.
- Cools recycle ethylene vapor (tube side) with overhead vapor from D-370 (shell side).
- It cools ethylene vapor before it goes to T-370.
E-370 (Deethenizer Condenser)
- A shell and tube, U-tube heat exchanger, with a kettle-shaped shell.
- Cools overhead ethylene vapor from T-370 (tube side) with propylene refrigerant from D-510 (shell side).
- Condenses overhead vapor, which is then separated in D-370 for use as reflux on T-370.
D-370 (Deethenizer Reflux Drum)
- Measures 5’D x 12’L.
- Separates liquid for reflux on T-370 from non-condensed vapor.
T-370 (Deethenizer)
- Measures 42”D x 50’5”L.
- Purifies recycled ethylene by removing butene and limits ethane concentration.
- Has perforated trays that only pass vapor (up) and liquid (down).
- Heavier molecules collect as liquid at the bottom, lighter molecules as vapor at the top.
D-362A/B (Deethenizer Feed Dryers)
- Measure 3’D x 44’6”L.
- They remove moisture from T-370's lower feed stream to prevent hydrate formation and catalyst deactivation.
- Gas exiting the drier should contain less than 1 ppm of water.
- One drier works while the other is on standby or regenerates.
F-362 (Deethenizer Feed Filter)
- Measures 8 ½”D x 4’4”L; a cartridge type filter.
- 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 3510 RPM electric motors.
- They circulate reflux to T-370.
- Equipped with chill-down lines for cooling before going online.
- One pump is normally in service, with the other on standby.
E-375 (Deethenizer Reboiler)
- Heats the contents of a fractionation column for separation by boiling points.
- Can be a shell and tube exchanger or a fired heater.
- E-375 is a shell and tube exchanger that heats T-370 bottoms (shell side) with 100 psig steam (tube side).
- It heats T-370 bottoms prior to being routed back to T-370.
D-375 (Recycle Cylinder Suction Drum)
- Measures 3’6”D x 8’L.
- Has an internal demister pad under the top vapor outlet.
- Removes entrained liquid from the vapor.
- Vapor enters on the upper side, liquid exits the bottom, and vapor exits the top.
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