T-470 Distillation Process Overview

Study Notes

C18 feed from T-460 bottom goes to F-473, then T-470, separating into C18 overhead and C20-C24 bottom streams.
T-470 overhead vapor flows to E-470, which cools it with boiler feed water, producing steam condensate directed to the 60 psig Steam Header.
Condensed vapor from E-470 goes to D-470; non-condensable vapor goes to E-471, cooled by cooling water, with a cooled condensate slip stream returning to D-470 and the rest to D-433.
Cooled overhead gas from D-470, combined with noncondensables from E-480, flows to Z-470, a 1st stage ejector using 100 psig steam.
Gas from Z-470 is cooled in E-479 with cooling water, condensate from which is routed to D-433.
Gases then proceed to Z-471, a 2nd stage ejector using 100 psig steam, before going to E-480.
Liquid from D-470 is pumped by P-470A/B through F-470 back to T-470 as reflux and through E-472, cooled by cooling water, to C18 product tanks (TK-1818/TK-38/TK-19).
T-470 bottom liquid heats in E-475 with Dowtherm, vapor returns to T-470.
Liquid from E-475 is pumped by P-475A/B through E-476, cooled by boiler feed water, producing steam condensate to the 15 psig Steam Header.
Cooled liquid then goes to E-477, cooled by cooling water, before being stored in TK-1820 or TK-822A.
Off-spec C18 and C20-C24 are routed to TK-800 or Slop.

F-473 removes particulate matter from the T-470 feed.
T-470 (4’6”D x 81’4”L) separates C18-C24 into C18 overhead and C20-C24 bottoms.
T-470 process control objectives: Maintain C20 concentration in overhead and C18 in bottoms within specifications.
E-470 cools and condenses T-470 overhead vapor using boiler feed water.
D-470 (3’6”D x 8’L) separates liquid for reflux and C18 product from non-condensable vapor.
E-471 cools and condenses overhead vapor from D-470 using cooling water.
Z-470 is the 1st stage ejector, lowering the pressure of the T-470 overhead.
E-479 cools and condenses steam from Z-470 using cooling water.
Z-471 is the 2nd stage ejector, further lowering the pressure of T-470 overhead.
F-470 removes particulate matter from the T-470 reflux.
P-470A/B pumps circulate reflux to T-470 and route C18 product; powered by 15 HP motors at 3500 RPM.
E-472 cools the C18 product using cooling water before storage.
E-475 is a kettle-type reboiler heating T-470 bottoms using Dowtherm to boil the bottoms into a vapor.
P-475A/B pumps route C20-C24 product; powered by 20 HP motors at 3550 RPM.
E-476 cools C20-C24 product with boiler feed water, generating 15 psig steam.
E-477 cools C20-C24 product using cooling water before storage.