C12-C24 Feed System Process

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Questions and Answers

What is the purpose of routing the overhead vapor from E-445 back to T-440?

It is for temperature control.

How is the liquid bottom from E-445 processed further?

It is routed by P-445A/B to T-450 as feed.

What happens to the feed after passing through F-453?

It is routed to T-450 between the top and bottom beds.

What is produced from the separation of the feed in T-450?

<p>An overhead vapor stream (C14 Product) and a bottom liquid stream (C16-C24).</p> Signup and view all the answers

Where is the overhead vapor from T-450 routed for cooling?

<p>It is routed to the shell side of E-450.</p> Signup and view all the answers

How is the steam condensate managed after cooling in E-450?

<p>It is routed to the 15 psig Steam Header.</p> Signup and view all the answers

What role do P-450A/B pumps play in the process?

<p>They route the liquid bottom from D-450 as reflux to T-450.</p> Signup and view all the answers

What is done with off-spec C14 product?

<p>It is routed to Unit 1791.</p> Signup and view all the answers

How is the overhead vapor from E-455 used in the system?

<p>It is routed back to T-450 for temperature control.</p> Signup and view all the answers

What happens to the liquid bottom from E-455?

<p>It is routed by P-455A/B to T-460 as feed.</p> Signup and view all the answers

What is the primary purpose of F-444 in the process described?

<p>F-444 serves as the C12 Tower Feed Strainer, filtering the feed before it enters the feed preheater.</p> Signup and view all the answers

How is the feed heated in E-443?

<p>The feed is heated by 400 psig steam on the tube side of E-443.</p> Signup and view all the answers

What are the two streams that the feed is separated into in T-440?

<p>The feed is separated into an overhead vapor stream (C12 Product) and a bottom liquid stream (C14-C24).</p> Signup and view all the answers

What is done with the condensed vapor from T-440 after it reaches D-440?

<p>The condensed vapor is routed to the top of D-440 (C12 Tower Reflux Drum).</p> Signup and view all the answers

What role does E-440 serve in the distillation process?

<p>E-440 functions as the C12 Tower Condenser, cooling the overhead vapor stream.</p> Signup and view all the answers

How is pressure control maintained in the system?

<p>Pressure control is maintained by joining cooled overhead gas from D-440 with noncondensables from E-480 before routing them to Z-440.</p> Signup and view all the answers

What is the function of P-440A/B in the process?

<p>P-440A/B routes the liquid bottom from D-440 back to T-440 as reflux and also sends it to the shell side of E-442.</p> Signup and view all the answers

What happens to the off-spec C12 product?

<p>Off-spec C12 is routed to Unit 1791 Heavy Rerun.</p> Signup and view all the answers

Which component is used to pull a vacuum in the system?

<p>100 psig steam is used to pull a vacuum in multiple ejector stages.</p> Signup and view all the answers

What is heated in E-445 and by what medium?

<p>The bottom liquid from T-440 is heated in E-445 by Dowtherm on the tube side.</p> Signup and view all the answers

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Study Notes

Feed System Overview

  • C12-C24 feed enters T-430 (C12-C24 Tower) and is directed to F-444 (C12 Tower Feed Strainer).
  • The feed is preheated in E-443 (C12 Tower Feed Preheater) using 400 psig steam, with condensate directed to the Steam Condensate Header.

C12 Tower Operation

  • Heated feed flows to T-440 (C12 Tower), entering on a chimney tray for effective vapor-liquid interaction.
  • Feed splits into overhead vapor (C12 Product) and bottom liquid (C14-C24).
  • Overhead vapor travels to E-440 (C12 Tower Condenser) where it's cooled by boiler feed water; condensed vapor goes to D-440 (C12 Tower Reflux Drum).

Vapor Management

  • Non-condensable vapor moves to E-441 (C12 Tower Vent Condenser) for cooling with water.
  • A portion of condensed vapor recirculates into D-440 to maintain pressure and system efficiency.
  • Cooled overhead gas from D-440 combines with non-condensables from E-480 for pressure control, then moves to Z-440 (C12 Tower 2nd Stage Ejector).

Ejector and Condensate Handling

  • 100 psig steam pulls a vacuum for the cooled overhead gas routing to E-449 (C12 Tower Ejector Interstage Condenser).
  • Condensate exits E-449 to D-433 (Process Water Surge Drum).
  • Gaseous product is sent to Z-441 (C12 Tower 2nd Stage Ejector) and further processes via E-480.

Reflux and Product Management

  • Liquid bottoms from D-440 are pumped by P-440A/B back to T-440 as reflux and also to E-442 (C12 Product Cooler).
  • Cooled C12 product is directed to TK-812; off-spec goes to Unit 1791.

C14 Tower Operation

  • Bottom liquid from T-440 feeds into E-445 (C12 Tower Reboiler), heated by Dowtherm.
  • Overhead vapor returns to T-440 for temperature regulation.

C14 Tower Process

  • T-450 (C14 Tower) receives C14-C24 feed, separated into overhead vapor (C14 Product) and bottom liquid (C16-C24).
  • Overhead vapor is condensed in E-450, and the condensate is sent to D-450 (C14 Tower Reflux Drum).
  • Non-condensables from E-451 are similarly handled, with some vapor returning to D-450.

C14 Product Handling

  • Cooled gases from D-450 and non-condensables are sent to Z-450 (C14 Tower 2nd Stage Ejector) for pressure management via E-459.
  • Liquid bottoms from D-450 are sent back to T-450 as reflux and to E-452 (C14 Product Cooler).

Product Outcomes

  • C14 product is cooled and stored in TK-814; off-spec product routed to Unit 1791.
  • T-450 bottom liquid is heated in E-455 (C14 Tower Reboiler) before being sent to T-460 (C16 Tower).

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