[curiouscat]

I was debottlenecking some Petroleum Refinery Unit Operations (non-aqueous) where to reduce equipment attack by traces (<1%) of dissolved  HCl they dose  2,2',2"-Nitrilotriethanol.

I was wondering what is the operative reaction here that kills the acid; is it just the stoichiometric adduct formation of 2,2′,2′′-Nitrilotriethanol hydrochloride?

That'd be a mol for mol stoichiometry.

Or is there another reaction system at work that I ought to consider? Also, what'd  be a good analytical method for estimating this organic-dissolved-HCl  so as to rationally decide on 2,2',2"-Nitrilotriethanol dosing quantities?

[discodermolide]

I was debottlenecking some Petroleum Refinery Unit Operations (non-aqueous) where to reduce equipment attack by traces (<1%) of dissolved  HCl they dose  2,2',2"-Nitrilotriethanol.

I was wondering what is the operative reaction here that kills the acid; is it just the stoichiometric adduct formation of 2,2′,2′′-Nitrilotriethanol hydrochloride?

That'd be a mol for mol stoichiometry.

Or is there another reaction system at work that I ought to consider? Also, what'd  be a good analytical method for estimating this organic-dissolved-HCl  so as to rationally decide on 2,2',2"-Nitrilotriethanol dosing quantities?

It would seen to be the HCl salt as you say.
I would titrate the organic dissolved HCl, then you will get an accurate value for the dosing.

[curiouscat]

It would seen to be the HCl salt as you say.
I would titrate the organic dissolved HCl, then you will get an accurate value for the dosing.

So just to clarify that'd mean titrating against, say, NaOH or KOH to a pH=7 end point? Or should I be using 2,2',2"-Nitrilotriethanol for the titration?

I was a bit worried if the HCl would actually dissociate fully in the non-aqueous medium. If not would titration against NaOH etc. work as usual?  Sorry if I am making any basic analytical chemistry blunders.

As an aside I am also wondering why the process designers had chosen 2,2',2"-Nitrilotriethanol for removing the HCl. Is this a natural choice? Sounded a bit exotic to me and I'm wondering if there'd be any other reagents I could try.

Any tips?

[discodermolide]

It would seen to be the HCl salt as you say.
I would titrate the organic dissolved HCl, then you will get an accurate value for the dosing.

So just to clarify that'd mean titrating against, say, NaOH or KOH to a pH=7 end point? Or should I be using 2,2',2"-Nitrilotriethanol for the titration?

I was a bit worried if the HCl would actually dissociate fully in the non-aqueous medium. If not would titration against NaOH etc. work as usual?  Sorry if I am making any basic analytical chemistry blunders.

As an aside I am also wondering why the process designers had chosen 2,2',2"-Nitrilotriethanol for removing the HCl. Is this a natural choice? Sounded a bit exotic to me and I'm wondering if there'd be any other reagents I could try.

Any tips?

Just a normal titration against NaOH will give you the HCl concentration.
No idea why they chose such an exotic amine, but there must be a reason for it.