Nalco Chemical Company

Veronica K Majestic

Russell C Strong

Manian Ramesh

Corrosion cracking and blistering of steels in contact with refinery streams containing cyanide is inhibited or prevented by treating said stream with a reaction product or products obtained by reacting morpholine and formaldehyde. The preferred corrosion cracking and blistering inhibiting treatment product is bis--morpholinyl-- methane.

Prevention of cracking and blistering of refinery steels by cyanide

A method of inhibiting carbonate stress corrosion cracking is determined to involve the addition of certain treatment chemicals to refinery process streams containing at least 1 of the volatile chemicals, ammonia, carbon dioxide, hydrogen sulfide, hydrogen cyanide, and water. The treatment chemical is preferably a fatty imidazoline compound or fatty amides or fatty esters or mixtures thereof. The imidazoline compounds and the amide/esters are formed by reacting tall oil fatty acids, naphthenic acids, or mixtures thereof with essentially linear heterochemicals containing amine or alcohol functionality.

Chemical abatement of carbonate cracking

Carbohydrazide is an effective material for preventing hydrogen blistering and corrosion in the refinery overhead condensate systems of Fluid Catalytic Cracking Units.

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Stafford, TX, United States of America

Veronica K Majestic