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?

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

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

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

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

It is routed to the 15 psig Steam Header. Signup and view all the answers

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

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

What is done with off-spec C14 product?

It is routed to Unit 1791. Signup and view all the answers

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

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

What happens to the liquid bottom from E-455?

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

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

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

How is the feed heated in E-443?

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

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

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

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

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

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

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

How is pressure control maintained in the system?

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

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

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. Signup and view all the answers

What happens to the off-spec C12 product?

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

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

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

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

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

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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Description

This quiz covers the process flow of the C12-C24 feed system, detailing the routing from T-430 to various components including F-444, E-443, and T-440. Understand how the feed is preheated and the role of steam condensate in the process.