C8-C10 Processing in T-420 Overview

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Questions and Answers

What three streams does T-420 (C8 Tower) separate into from C8-C10 feed?

Overhead vapor stream (octane), side-draw stream (decene product), and bottom liquid stream (C10-C12).

How is the overhead vapor from T-420 (C8 Tower) cooled?

It is cooled by cooling water on the tube side of E-420 (C8 Tower Condenser).

What happens to the non-condensable vapor from T-420?

It is vented to D-531 (Vent Header K.O.Drum).

What is the purpose of P-420A/B pumps in the C8 processing system?

They route the liquid from D-420 either back to T-420 as reflux or to E-422 for cooling. Signup and view all the answers

Where is the C8 product stored after passing through the processing system?

The C8 product is stored in TK-808 (C8 Product Tank). Signup and view all the answers

What type of column is T-430 (C12-C24 Tower)?

It is a packed vacuum column. Signup and view all the answers

How is the vacuum in the T-430 tower maintained?

The vacuum is maintained by a two-stage ejector system. Signup and view all the answers

What streams are separated in T-430 (C12-C24 Tower)?

Overhead vapor stream (C12-C24), side-draw liquid stream (C24-C28 product), and bottom liquid stream (C30+ product). Signup and view all the answers

What is done with the liquid collected from the packed beds in T-430?

It is redistributed between each packed bed to ensure good distribution. Signup and view all the answers

What happens to the condensed vapor from E-430 (C12-C24 Tower Condenser)?

It is routed to the top of D-430 (C12-C24 Tower Reflux Drum). Signup and view all the answers

What is the purpose of routing non-condensable vapor to the shell side of E-431?

To cool the vapor using cooling water on the tube side. Signup and view all the answers

How is the condensed vapor from E-431 returned to D-430?

A slip stream of condensed vapor is routed back to D-430. Signup and view all the answers

What role does 100 psig steam play in the system?

It is used to pull a vacuum for routing gases through various condensers and ejectors. Signup and view all the answers

What happens to condensate collected at the bottom of D-430?

It is routed to D-433, the Process Water Surge Drum. Signup and view all the answers

Where does the overhead vapor from D-443 get routed after passing through the coalescer?

It is routed to the shell side of E-434 for heating. Signup and view all the answers

What is the purpose of the superheated steam in E-435?

It depresses the boiling point of hydrocarbons, minimizing degradation. Signup and view all the answers

What is the function of Z-435A/B in the processing line?

It is a high-speed centrifuge designed to remove heavy polymers. Signup and view all the answers

How is off-spec product managed within the system?

It can be routed to TK-800 or Slop for proper disposal. Signup and view all the answers

What process occurs in T-431 with the C24-C28 feed?

The feed is separated into overhead vapor and bottom liquid streams. Signup and view all the answers

What is the final destination for the cooled liquid from E-432?

It is routed to F-431 for filtration and then to storage in Unit 1791. Signup and view all the answers

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Study Notes

C8-C10 Processing in T-420 (C8 Tower)

C8-C10 feed from T-410 (C6 Tower) bottom is split into three streams in T-420 (C8 Tower): overhead vapor (octane), side-draw (decene product), and bottom liquid (C10-C12).
Overhead vapor from T-420 is sent to E-420 (C8 Tower Condenser) for cooling, where it is condensed and routed to D-420 (C8 Tower Reflux Drum).
Non-condensable vapors are vented to D-531 (Vent Header K.O. Drum).
P-420A/B (C8 Tower Reflux & Product Pumps) manage liquid routing from D-420 either back as reflux to T-420 or to E-422 (C8 Product Cooler) for further cooling.
C8 product is stored in TK-808 (C8 Product Tank).
The side-draw stream is sent to E-421 (C10 Product Cooler) for cooling before being stored outside battery limits at Unit 1791.
The bottom liquid stream is directed to E-425 (C8 Tower Reboiler), heated with 400 psig steam, and re-routed to T-420 for temperature control.

C12-C30+ Processing in T-430 (C12-C24 Tower)

C12-C30+ feed from T-400 enters T-430 (C12-C24 Tower) as a two-phase liquid and separates into overhead vapor (C12-C24), side-draw liquid (C24-C28), and bottom liquid (C30+).
T-430 operates under vacuum with a two-stage ejector system and has three packed beds for liquid distribution.
Overhead vapor is cooled in E-430 (C12-C24 Tower Condenser) and sent to the top of D-430 (Reflux Drum), while non-condensables pass through E-431 (Vent Condenser).
Maintained pressure control is established by routing overhead gases through Z-430 (1st Stage Ejector) and Z-431 (2nd Stage Ejector) before common ejector processing.
Liquid bottoms from D-430 are routed back to T-430 as reflux via P-430A/B.

Additional Processing in T-431 (C24-C28 Stripper)

C24-C28 feed from T-430 enters T-431 and is separated into an overhead vapor stream (nitrogen and steam condensate) and a bottom liquid stream (C24-C28 product).
Nitrogen is used to strip the product in T-431, with excessive water returning to T-430.
Bottom liquid stream flows to D-431 (C24-C28 Product Accumulator) where nitrogen further strips residual water.
The cooled liquid from D-431 enters E-432 (C24-C28 Product Cooler) and is then filtered in F-431 before being stored.

Final Notes on Product Handling

Condensate from the process is routed to D-433 (Process Water Surge Drum).
The overhead vapor from various units is strategically routed for cooling or further processing to ensure efficiency.
Off-spec products can be redirected to TK-800 (C6+ Storage Tank) or designated slop handling pathways.