CORROSION INHIBITOR (OIL SOLUBLE WATER DISBERSABLE) 1

[mustaffa]

SUBJECT: RESIDUAL AMINE TEST.
WOULD YOU PLEASE TO INFORM ME HOW TO MEASURE THE RESIDUAL AMINE FROM OIL SAMPLE WHICH TAKEN FROM THE END OF SHIPPING OIL LINE.
THE SHIPPING LINE TREATED BY CORROSION INHIBITOR (OIL SOLUBLE) CONTIANUES TREATMENT.

THANKS FOR ALL.
MUSTAFFA/CHEMICAL ENGINEER

 

[RogerH]

Mustafa
ask the vendor of the inhibitor for which test he used to determine the concentration(s). Inhibitors can be a mix of amines but if not consumed, one, the most easy one, should be OK to give residual concentration of inhibitor.

 

[orenda1168]

In view of the very low usage rate of amine-based pipeline corrosion inhibitors, in the part per million range, I would doubt that a residual amine test exists as the inhibitor concentration will be overshadowed by the hydrocarbon composition. To my experience, the performance of these inhibitors is measured indirectly by corrosion coupons/spindles inserted in the pipeline at various locations.

Why are you concerned with the residual concentration?

Orenda

 

[mustaffa]

Thank you very much for your reply ,I am agree with you the best method for monitorng corrosion inhibitor corrosion coupons but the claint requested from us to measure the residual corrosion inhibitor or l amine in the end of shipping line .
that is why i want to know procedure for measure residual from oil sample which taken from the last point of the shipping line.
N.B
(I HAVE SPECTROPHOMETER )
another question do you have any idea how to calculate the stabilaty of the filming amine by using equesion.
Thanks alot for help.
MUSTAFFA

 

[orenda1168]

I would suggest that you now contact one or more of the major corrosion inhibitor manufacturers for the petroleum industry, including Nalco, GE Betz, Baker-Hughes to name a few, for their input. As I indicated earlier, and unless the science of residual amine analysis in a hydrocarbon system has greatly changed, I don't believe that there is a practical answer to this qiestion.

Out of curiosity, why does your client need to know the residual amine concentration?

While there may be a formula to calculate the stability of an amine corrosion inhibitor in use, I'm not familiar with such, and am not sure that this can be formulized because of the very difficult-to-quantify variables involved. Again, one or more of the suppliers above may be able to help you with this.

Orenda

 

[orenda1168]

I would also add that filming amines function on an absorption-deabsorption mechanism, whereby a very thin film of the inhibitor, probably monomolecular, is absorbed onto the surface of the carrier pipe (in the case of hydrocarbon pipelines). Because of the "wiping" action of the hydrocarbon stream velocity removing, or deabsorbing, the amine layer, a continuous feed of the amine must be done to replenish the surface layer and maintain protection.

The absorption-deabsorption mechanism generally reaches near equilibrium conditions, so that some amount of amine will be always present in the transported product at the end of the pipeline. I am not aware of any concern for the amount of the residual amine present.

If your client's concern is related to knowing that corrosion inhibitor is present throughout the pipeline, he would be better advised to utilize corrosion coupons/spindles to monitor corrosion protection, rather than rely on guessing the appropriate inhibitor concentration required.

Orenda