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Questions and Answers
What is the primary function of the M-340 Caustic Wash Static Mixer?
To mix heated circulating caustic into the process.
How does the T-340 Caustic Wash Vapor Scrubber operate?
It separates vapor from two liquid phases, with fresh process water entering from the top and overhead vapor exiting from the top.
What is the purpose of the D-340 Caustic Wash Settler?
To separate the two liquid phases into a caustic stream and a hydrocarbon stream.
What issue can arise if the rag layer in the D-340 settler is allowed to accumulate?
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What type of fluid does the M-341 Caustic Makeup Static Mixer blend?
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Describe the functionality of the P-340A/B Caustic Wash Circulation Pumps.
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What mechanical principle does a centrifugal pump, like P-340A/B, operate on?
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What is the horsepower rating of the motors driving the P-340A/B pumps?
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In what configuration do the P-340A/B pumps typically operate?
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What role does the skim system play in the D-340 settler?
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Study Notes
Caustic Wash System Components
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M-340 (Caustic Wash Static Mixer): Integrates heated circulating caustic into the process using two fixed carbon steel elements for effective mixing.
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T-340 (Caustic Wash Vapor Scrubber): Measures 2’ diameter by 26’ length; separates vapor from liquid phases through a three-phase stream entry at the bottom and fresh process water entry at the top, with vapor exiting from the top and liquid phases from the bottom.
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D-340 (Caustic Wash Settler): Measures 7’ diameter by 28’ length; separates two liquid phases into caustic and hydrocarbon streams. Equipped with a skim system to continuously remove rag layers at the interface, preventing hydrocarbon/caustic separation interference and minimizing caustic entrainment.
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Skim System: Features a skim pan spanning across the drum at 50% of the interface float column, channeling removed rag layers to D-345 (Continuous Skim Drum) for further handling.
Caustic Makeup and Pumping
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M-341 (Caustic Makeup Static Mixer): Blends 50% makeup caustic with process water to create a 25% dilution, utilizing six fixed carbon steel elements for thorough mixing.
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P-340A/B (Caustic Wash Circulation Pumps): Single-stage centrifugal pumps driven by 15 HP, 1750 RPM induction electric motors; primarily circulates recycled caustic and fresh caustic make-up injected by P-342A/B (Caustic Make-Up Pumps). One pump typically operates while the other remains on standby.
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Centrifugal Pump Operation: Converts mechanical energy into hydraulic pressure using an impeller; increases fluid velocity and pressure as liquid moves from the suction center to the discharge.
Heating and Skimming Processes
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E-340 (Caustic Wash Heater): A multi-tube U-type exchanger that heats circulating caustic via 100 psig steam on the tube side, working to maintain optimal temperature during the washing process.
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D-345 (Continuous Skim Drum): Measures 3’ diameter by 9’ length; designed for the continuous removal of the rag layer gathered in D-340 (Caustic Settling Drum), ensuring effective phase separation.
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Description
Test your knowledge on the operation and design of M-340 Caustic Wash Static Mixer and T-340 Caustic Wash Vapor Scrubber. This quiz covers essential information about mixing and separation processes used in chemical engineering. Perfect for students and professionals in the field!
