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• How can I know there is weak acids in crude oil and what's the effect of weak acid on the overhead conditions in the crude distillation unit?

  Jun-2023

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Answers

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• Walter Militello, Nalco Champion Co, wmilitello@nalco.com

  There are several analytical methods to detect the weak acid concentration in overhead water. Nalco has a proprietary analytical method for strong and weak acids concentration detection. Their presence reduces the water pH, with difficulties on neutralisation because those acids form pH buffers with neutralisers.

   

  Sep-2023

• Henk Helle, CorrosionControl.Nu, helle@corrosioncontrol.nu

  Ignore. Weak acids have a negligible effect on the corrosive conditions on  or in the overhead exchanger or condenser tubes, which are dominated by HCl.

  Sep-2023

• Ron van Rijswijk, Dutch stockpiling agency (COVA), vanrijswijk@cova.nl

  Small rectification TAN (total acid number) = SAN+WAN (sum of strong and weak acids)

  Sep-2023

• sam lordo, Becht, salordo@comcast.net

  Weak acids can be present in crude oils form production chemicals, they can also form form the themeral degration of Naph Acids in the furnaces.. the impact on the overhead is one that can increase neutraliser demand . Since the weak acids create a senario wher ethe more you neutralize the more you generate free acid (buffering) , hence one could over treat with neutraliser to the point where the ovhd water becomes corrosive even at pH of 7-7.5... if this is a suspected issue the easiest approach is to add neutraliser to  a pH of 5.5 -6.0 and increase the filming amine 2-3 X normal dosage

  Aug-2023

• Ron van Rijswijk, Dutch stockpiling agency (COVA), vanrijswijk@cova.nl

  Common test for crude oil is test for TAN, i.e. total acid number. This is the sum of weak and strong acids (TAN+SAN+WAN) and can be reported separate. To find strong acids in crude is rare and very alarming, so most of the time TAN equals WAN

  Aug-2023

• SRIDHAR BALAKRISHNAN, NAGARJUNA OIL CORPORATION LIMITED, laksrid@yahoo.com

  Most of the acids present in crude oil are naphthenic acids. They are organic acids, separation of weak acid and strong acids identification, separation etc, is not available in the literature.

   

  Jul-2023