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Questions and Answers
What is the primary purpose of the D-310A/B separators?
To separate the cooled reactor effluent into a liquid product stream and a recycle ethylene vapor stream.
How does the T-330 scrubber help prevent issues in downstream equipment?
It removes aluminum alkyls that could cause plugging due to ethylene polymerization.
What does the E-330A/B coolers do with the ethylene vapor stream?
They cool the ethylene vapor stream using cooling water on the shell side.
What is the role of the D-330 H.P. Recycle K.O. Pot's internal demister pad?
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What action is taken if the T-330 scrubber experiences fouling?
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Where do the liquid product stream and recycle ethylene vapor stream exit in the D-310A/B separators?
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What materials are the inlet, outlet, and bypass valves of the T-330 scrubber impregnated with, and why?
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What is the purpose of the D-345 Continuous Skim Drum?
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How does the T-344 Degassing Tower manage the spent caustic?
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What is the function of the P-344 Spent Caustic Transfer Pump?
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Why is the D-350 Water Wash Settler important in the process?
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What happens if the rag layer is allowed to accumulate in the D-350 Water Wash Settler?
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What is the primary function of the hairpin heat exchanger E-320?
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Describe the design of the static mixer M-320.
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What type of heat exchanger is E-321 and what does it do?
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What function does the D-321 Catalyst Blend Drum serve?
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What is the purpose of the P-321A/B pumps?
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How does M-340 contribute to the caustic wash process?
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What does T-340 do in the caustic wash system?
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What role does D-340 play in the caustic wash system?
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What is the function of the E-340 heater?
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What is the significance of the skim system in the D-340 Settler?
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Study Notes
Reactor Effluent Separators (D-310A/B)
- Dimensions: 8' diameter x 28' 8 5/16" length.
- Function: Separate cooled reactor effluent into liquid product and recycle ethylene vapor streams.
- Configuration: Liquid exits from the bottom; vapor exits from the top.
- Operation: Only one separator in service, the standby separator remains under nitrogen pressure to prevent air ingress.
TEA Scrubber (T-330)
- Dimensions: 3' diameter x 23' 6" length.
- Purpose: Remove aluminum alkyls to prevent downstream plugging due to ethylene polymerization.
- Cleaning: Periodic cleaning necessary due to fouling; equipped with Teflon-impregnated valves for minimized fouling.
- Inlet configuration: Recycle ethylene vapor stream enters from the side bottom, C10-12 stream enters from the side top.
Ethylene Recycle Coolers (E-330A/B)
- Type: Multi-tube U-type heat exchangers.
- Function: Cool ethylene vapor using cooling water; both coolers typically in service.
- Maintenance: Fouling indicated by rising effluent temperatures, necessitating cleaning of the affected exchanger.
H.P. Recycle K.O. Pot (D-330)
- Dimensions: 3' 6" diameter x 7' 9" length.
- Feature: Internal demister pad to remove entrained liquid from cooled ethylene.
- Flow: Ethylene enters from the side; liquid exits from the bottom, vapor from the top.
Catalyzed Product Heater (E-320)
- Design: Hairpin heat exchanger with a unique U-shaped pipe design.
- Function: Heats product stream with 60 psig steam; suitable for limited space and high thermal shock risk.
Static Mixer (M-320)
- Dimensions: 28" long and 6" diameter.
- Use: Mixes 0.2% nickel catalyst into the process without moving parts.
- Spare available featuring an internal baffle design.
Catalyzed Mixing Vessel (D-320)
- Dimensions: 5' diameter x 24' length.
- Purpose: Provides residence time for the nickel-based catalytic reaction; mixed product exits from the top.
Catalyzed Product Cooler (E-321)
- Type: Double-pipe heat exchanger.
- Function: Cools converted product stream using cooling water for heat exchange.
Catalyst Blend Drum (D-321)
- Dimensions: 5' diameter x 6' length.
- Purpose: Dilutes 2% nickel catalyst with C14 to achieve a 0.2% dilution for storage.
Catalyst Solution Injection Pumps (P-321A/B)
- Type: Positive displacement pumps driven by 0.25 HP electric motors.
- Function: Route 0.2% nickel catalyst from blend drum to mixer.
Caustic Wash System
- Consists of static mixers, scrubbers, separators, and circulation pumps to facilitate caustic wash processes.
Spent Caustic System
- Treats spent caustic, separating phases and routing vapors safely to flare systems or sewer lines.
Water Wash System
- Provides a wash process with circulation pumps and heaters to treat hydrocarbon streams and recycle water efficiently.
Maintenance and Safety
- Systems include periodic checks for fouling, operational redundancy, and precautions for vapor control to prevent atmospheric release.
- Skim systems included to manage rag layer accumulation and maintain separation clarity.
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Description
This quiz covers the function and operation of D-310A/B Reactor Effluent Separators, which are designed to separate cooled reactor effluent into liquid and vapor streams. You'll learn about the design specifications, including dimensions and the operational methods of these critical components in a reactor system.
