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Questions and Answers
What is the main purpose of D-310A/B reactors?
To separate cooled reactor effluent into a liquid product stream and a recycle ethylene vapor stream.
Where does the recycle ethylene vapor stream exit in D-310A/B separators?
It exits from the top of the separators.
What is the role of T-330 (TEA Scrubber) in the process?
To remove aluminum alkyls that could cause plugging in downstream equipment.
How does the C10-12 stream function in relation to the TEA Scrubber?
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What maintenance might be required for T-330 (TEA Scrubber)?
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What type of heat exchangers are E-330A/B, and what is their primary function?
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When would E-330A/B coolers be taken out of service?
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What feature of D-330 (H.P. Recycle K.O. Pot) helps separate liquid from vapor?
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From where does the ethylene enter the D-330 K.O. Pot?
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What exits from the bottom of the D-330 K.O. Pot?
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Study Notes
Reactor Effluent Separators (D-310A/B)
- Dimensions: 8 feet diameter, 28 feet 8.3125 inches length.
- Separates cooled reactor effluent into two streams: liquid product and recycle ethylene vapor.
- Liquid product exits from the bottom; recycle ethylene vapor exits from the top of the separators.
- One separator operates while the other remains in standby, held under nitrogen pressure for air removal.
TEA Scrubber (T-330)
- Dimensions: 3 feet diameter, 23 feet 6 inches length.
- Removes aluminum alkyls to prevent downstream equipment plugging due to ethylene polymerization.
- C10-12 stream from the recycle ethylene vapor stream inhibits aluminum alkyl reactions.
- Recycle ethylene vapor enters from the side bottom and C10-12 enters from the side top; vapor exits from the top, liquid from the bottom.
- Periodic cleaning may be required due to potential fouling; equipped with Teflon impregnated valves to reduce fouling.
- Bypass capability for clean-up; each tray has a manway for easier access during cleaning.
Ethylene Recycle Coolers (E-330A/B)
- Multi-tube U-type heat exchangers for cooling ethylene vapor using cooling water.
- Typically, both coolers operate simultaneously.
- When efficiency declines (indicated by increasing effluent temperatures), the fouled cooler is taken offline for cleaning.
High-Pressure Recycle Knock-Out Pot (D-330)
- Dimensions: 3 feet 6 inches diameter, 7 feet 9 inches length.
- Features an internal demister pad to remove entrained liquid from ethylene during cooling.
- Ethylene enters the pot from the side, with liquid exiting from the bottom and vapor from the top.
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Description
This quiz covers the operation and design of D-310A/B Reactor Effluent Separators. You'll learn about the separation process of cooled reactor effluent into liquid and vapor streams. Test your knowledge on the functionality and configuration of these critical systems.
