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Questions and Answers
What is the purpose of circulating solvent through the NAOU Reactor Coils?
To remove residual buildup caused by polymer fouling.
When is R-201 taken offline for cleaning?
When there are hot spots, increased differential pressure, or high equipment fouling.
What is the role of the P-450 pump in the cleaning process?
It pumps C14 product into R-201 to flush the injection line.
What is done with the solvent after R-201 is cleaned?
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How is the temperature of R-201 maintained during the wash process?
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What is the purpose of E-610 in the solvent recovery process?
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How is the solvent cooled in D-620?
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What initiates the cleanup of spent solvent from D-600?
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What is done to R-201 before feeding ethylene?
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What happens to the clean solvent after it is filled in D-600?
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Study Notes
Cleaning Process of Reactors and Coolers
- R-201, R-202, R-203 (Reactors) and E-201, E-202, E-203 (Reactor Effluent Coolers) require cleaning when fouled with polymer buildup.
- Polymer fouling is identified by hot spots, increased differential pressure, or high equipment fouling levels.
Cleaning Materials and Equipment
- Cleaning is performed using solvents, including C12s, C14s, C16s, or C18s.
- Solvent for Units 1797 and 1798 is stored in TK-54 (Wash Solvent Storage Tank), found in the 1795 Tank Farm.
Process Steps
- Cleaning involves a batch operation; the reactor and cooler are taken offline.
- Catalyst flow to R-201 is halted by closing the flow control valve before initiating the cleaning process.
- An injection line is flushed with C14 product from D-450 (C14 Reflux Drum) and pumped into R-201 using P-450 (T-450 Reflux Pump).
Purging and Pressurization
- R-201 is purged with ethylene to D-310A/B (Reactor Effluent Separator) to clear out residual product.
- The reactor is depressurized and isolated at R-201 inlet and E-201 outlet.
- Pressure is equalized with D-600 (Solvent Surge Drum) before solvent circulation begins.
Solvent Circulation
- P-600A/B (Solvent Circulation Pumps) starts on minimum flow bypass to recirculate solvent back to D-600.
- Solvent flows through R-201, E-201, F-600A/B (Solvent Strainer), and returns to the surge drum.
Temperature Control
- 400 psig sparge steam is utilized to maintain a consistent temperature in R-201 during washing.
Completion of Cleaning
- After circulation, solvent is purged out of R-201 using ethylene from D-330 (Recycle KO Drum) outlet.
- Collected solvent is routed to D-620 (Clean Solvent Drum), with any entrained solvent reclaimed via E-620 (Solvent Vent Condenser).
- Ethylene purge from D-600 is cooled in E-610 (Solvent Condenser), condensing solvent into D-620.
Restoring Operations
- Upon completing the wash cycle, R-201 is prepped for service, heating is initiated using 400 psig steam if necessary.
- Ethylene feed is restored and catalyst injection resumes in R-201.
Handling Spent Solvent
- Spent solvent in D-600 is transferred to D-610 (Solvent Blow Down Drum) after settling.
- Clean up operations permit replenishment of solvent from Unit 1795 TK-54 to D-620.
- Clean solvent in D-620 is pumped to fill D-600, preparing the system for the next operational cycle.
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Description
This quiz covers the cleaning processes for R-201-205 reactors and associated piping using solvents to remove polymer buildups. It explores the periodic cleaning operations, the types of solvents used, and the specifics regarding the Wash Solvent Storage Tank. Participants will test their knowledge on best practices for maintaining reactor efficiency.
