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Degradation of Carboxylic Acids and the Impact on Refinery Feed Preparation and Overhead Corrosion

Thermal and/or hydrolytic stability behavior of solutions of carboxylic acids. This work thermally stressed aqueous solutions of carboxylic acids and analyzed the resulting solution and headspace. Expected corrosion impact on distillation overheads and brine rundown systems.

Product Number: 51317--9289-SG
ISBN: 9289 2017 CP
Author: Karl Kuklenz
Publication Date: 2017
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This paper reviews the thermal and hydrolytic stability behavior of carboxylic acid solutions commonly used in refinery feed preparation units and if possible will characterize their associated daughter molecules. Crude oils are often treated with carboxylic acids to help accomplish some of the goals of feed preparation such as pH adjustment amine removal and metals removal. These acids like the crude oil itself are subjected to the extreme temperatures of the crude furnace when they pass through the desalter dissolved in the crude oil or as unresolved water carryover. Often the thermal decomposition values for a pure acid are used to indicate the level of risk to the crude unit. The hidden assumption is that the behavior observed with an aqueous solution is the same as it would be for the neat acid. This paper documents the solution and headspace chemistry of aqueous solutions of carboxylic acids that have been thermally stressed in a laboratory setting. The paper will then discuss the expected corrosion impact on distillation overhead environments and related brine treatment systems.

Key words: amine, acid, crude unit, decomposition

This paper reviews the thermal and hydrolytic stability behavior of carboxylic acid solutions commonly used in refinery feed preparation units and if possible will characterize their associated daughter molecules. Crude oils are often treated with carboxylic acids to help accomplish some of the goals of feed preparation such as pH adjustment amine removal and metals removal. These acids like the crude oil itself are subjected to the extreme temperatures of the crude furnace when they pass through the desalter dissolved in the crude oil or as unresolved water carryover. Often the thermal decomposition values for a pure acid are used to indicate the level of risk to the crude unit. The hidden assumption is that the behavior observed with an aqueous solution is the same as it would be for the neat acid. This paper documents the solution and headspace chemistry of aqueous solutions of carboxylic acids that have been thermally stressed in a laboratory setting. The paper will then discuss the expected corrosion impact on distillation overhead environments and related brine treatment systems.

Key words: amine, acid, crude unit, decomposition

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