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51313-02134-Examination of a Green Corrosion Inhibitor and CRAs for the Overhead of Crude Oil Distillation Unit

Picture for Examination of a Green Corrosion Inhibitor and CRAs for the Overhead of Crude Oil Distillation Unit
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Product Number: 51313-02134-SG
ISBN: 02134 2013 CP
Author: Alec Groysman
Publication Date: 2013
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The aim of this work is to examine new corrosion inhibitors and 9 different alloys for use at the overhead of the crude oil distillation unit. Carbon steel is the main material of pipes air coolers heat exchangers and trays of the overhead of crude oil distillation unit. This situation requires using corrosion neutralizers and inhibitors injected into the overhead. Ammonia organic amines amides and imidazolines are used for this purpose. In order to avoid using environmentally - unfriendly corrosion neutralizers (mainly ammonia) new "green" corrosion inhibitors were examined in a model aggressive solution during distillation procedure under laboratory conditions. This model solution contained aggressive species (Cl- and H2S) in concentrations 30 times more than actually present in the overhead. New "green" corrosion inhibitors containing alcohol organic amine and a polyphenolic compound showed 87-93% efficiency at concentrations of 30-40 ppm under laboratory conditions.
A radical decision in the overhead is changing the metallurgy of pipes air coolers heat exchangers and trays of the crude oil distillation unit. Corrosion resistant alloys (CRA) stainless steels (SS) 304 L 316 LN 904 LN AL-6XN 254 SMO SAF 2507 (duplex stainless steel) Nimofer 6629 (high nickel alloy) Ti Gr. 2 and CDA 443 (Admiralty Brass) were examined in the model aggressive solution (pH=3.25) similar to the examination of the corrosion inhibitors. Their corrosion resistance was compared with that of carbon steel ASTM A179. A high corrosion rate (~ 2.3 mm/year) was found for carbon steel and CDA 443. Other CRA showed very low corrosion rates (max 0.1 mm/year) and were recommended for use as materials of pipes air coolers heat exchangers and trays in the overhead. Air cooler and heat exchanger tubes made from Ti Gr. 2 have been used for 18 years in the refinery with great success. Values of return of investment for each CRA were calculated. They vary from a month (for SS 304 L) to 4 years (for Nimofer 6629).
 

The aim of this work is to examine new corrosion inhibitors and 9 different alloys for use at the overhead of the crude oil distillation unit. Carbon steel is the main material of pipes air coolers heat exchangers and trays of the overhead of crude oil distillation unit. This situation requires using corrosion neutralizers and inhibitors injected into the overhead. Ammonia organic amines amides and imidazolines are used for this purpose. In order to avoid using environmentally - unfriendly corrosion neutralizers (mainly ammonia) new "green" corrosion inhibitors were examined in a model aggressive solution during distillation procedure under laboratory conditions. This model solution contained aggressive species (Cl- and H2S) in concentrations 30 times more than actually present in the overhead. New "green" corrosion inhibitors containing alcohol organic amine and a polyphenolic compound showed 87-93% efficiency at concentrations of 30-40 ppm under laboratory conditions.
A radical decision in the overhead is changing the metallurgy of pipes air coolers heat exchangers and trays of the crude oil distillation unit. Corrosion resistant alloys (CRA) stainless steels (SS) 304 L 316 LN 904 LN AL-6XN 254 SMO SAF 2507 (duplex stainless steel) Nimofer 6629 (high nickel alloy) Ti Gr. 2 and CDA 443 (Admiralty Brass) were examined in the model aggressive solution (pH=3.25) similar to the examination of the corrosion inhibitors. Their corrosion resistance was compared with that of carbon steel ASTM A179. A high corrosion rate (~ 2.3 mm/year) was found for carbon steel and CDA 443. Other CRA showed very low corrosion rates (max 0.1 mm/year) and were recommended for use as materials of pipes air coolers heat exchangers and trays in the overhead. Air cooler and heat exchanger tubes made from Ti Gr. 2 have been used for 18 years in the refinery with great success. Values of return of investment for each CRA were calculated. They vary from a month (for SS 304 L) to 4 years (for Nimofer 6629).
 

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