US 12,510,313 B1Granted

Method of cleaning a cold box

AssigneeKuwait National Petroleum Company

InventorsKanagasabai Sabapathi, Saleh N.S.E. Aljateli, Abdulrahman Al Sumaie

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Abstract

A method of cleaning a cold box of an exchanger includes performing a methanol pre-flush of the system and inspecting filters in a filtration unit. The method includes adding toluene reformate to circulation tank and circulating the toluene reformate. The method includes analyzing the circulating toluene reformate for sulfur content. The method includes starting a circulating pump and resuming circulation in a bottom to top flow. The method includes reversing circulation flow path to a top to bottom flow. The method includes returning the circulation flow path to the bottom to top flow and circulating the toluene reformate. The method includes starting the circulation pump and resuming circulation of the toluene reformate in the bottom to top flow path until sulfur levels are stable. The method includes emptying the toluene reformate from the system and flushing the system. The method includes performing a methanol post wash and dedusting the system.

Claims18

Dependent claims

A method of cleaning a cold box of an exchanger, the method comprising:

performing a methanol pre-flush of a cold box system including
filters in a first filtration unit;
adding toluene reformate to a first circulation tank;
circulating the toluene reformate through the cold box system, including:
measuring sulfur levels in the circulating toluene reformate;
and
starting a circulating pump and resuming the circulation in a bottom to top flow path;
reversing a circulation flow path of the toluene reformate to a top to bottom flow path, including:
returning the circulation flow path of the toluene reformate to the bottom to top flow path and circulating the toluene reformate in the bottom to top flow path;
starting the circulation pump and resuming the circulation of the toluene reformate in the bottom to top flow path until the sulfur levels are below a predetermined threshold for at least 2 hours;
emptying the toluene reformate from the system;
flushing the system;
performing a methanol post wash;
and
dedusting the system.

12 more elements

Dependencies are inferred from the claim text.