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Questions and Answers
What is the purpose of routing spent caustic to T-344 (Degassing Tower)?
The purpose is to degas the spent caustic before further processing.
What happens when there is a high level in D-360 (Booster Cylinder Suction Drum)?
An intermittent process stream is routed to D-344 (Spent Caustic Settling Drum) to prevent a shutdown.
Which pump is responsible for moving spent caustic from D-344 to the spent caustic coolers E-344A/B?
P-344 (Spent Caustic Transfer Pump) is responsible for this movement.
How is the spent caustic cooled in the spent caustic coolers E-344A/B?
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What role does D-344 (Spent Caustic Settling Drum) play in this process?
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What is done with the hydrocarbon that exits the bottom of D-344?
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What is the destination of the spent caustic after leaving D-344?
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Study Notes
Spent Caustic Management Process
- Spent caustic from the bottoms of D-340 (Caustic Wash Settler) and D-345 (Continuous Skim Drum) is directed to T-344 (Degassing Tower), integrating additional spent caustic from Unit 1798.
- Overhead gases from T-344 are sent to the Purge Gas Header for further handling.
- In D-344 (Spent Caustic Settling Drum), spent caustic is introduced on the water side, ensuring proper separation and settling.
High-Level Management
- An intermittent process stream is diverted to D-344 from D-360 (Booster Cylinder Suction Drum) to mitigate potential system shutdowns of C-360A/B (Booster/Recycle Compressors) during high-level conditions.
Hydrocarbon and Slop Oil Routing
- The Slop Oil Header contributes its flow to D-344, facilitating the recovery of hydrocarbon materials.
- The bottom outlet of D-344 routes spent caustic through P-344 (Spent Caustic Transfer Pump) to the tube side of E-344A/B (Spent Caustic Coolers) for temperature regulation using cooling water on the shell side.
Recovery and Storage
- After cooling, the spent caustic is sent to storage in Unit 1791 TK-60 for future use or processing.
- Hydrocarbon, also exiting from the bottom of D-344, is transferred via P-345A/B (Hydrocarbon Recovery Pump) and/or P-346 (Hi Volume Hydrocarbon Recovery Pump) back to D-340 (Caustic Wash Settler) for further treatment.
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Description
This quiz covers the routing processes involved in handling spent caustic in chemical engineering systems, specifically focusing on equipment such as the D-340 Caustic Wash Settler, D-345 Continuous Skim Drum, and T-344 Degassing Tower. Understand the significance of these processes and their impact on operational efficiency.
