Help with reaction between MEA and phosphorus acid
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hoangnga0896
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Help with reaction between MEA and phosphorus acid


I have done an experiment with 2 substances monoethanolamine (MEA) and phosphorus acid (H3PO3) but I do not know exact products of this reaction. Could anyone give an idea about this problem?
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ChenBeier
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Itis a normal neutralisation.

2 HOCH2CH2NH2 + H3PO3 => [HOCH2CH2NH3]2HPO3
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hoangnga0896
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Actually, MEA is taken into a mixture of CuSO4 and H3PO3. I saw a white cloud after reaction. I wonder if it is CO2 or NOx smoke...
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ChenBeier
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The white cloud is the ammoniumsalt nebula.
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hoangnga0896
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You mean [HOCH2CH2NH3]2HPO3 is in nebular form?
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ChenBeier
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Correct. The same if you use ammonia gas and HCl gas.
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hoangnga0896
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So there is no amoniumsalt in the solution?
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ChenBeier
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Its in the solution as well. The cloud appers because it gets hot during neutralisation.
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hoangnga0896
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Could you send me documentaries related to this reaction via my email: hoangnga.0896@gmail.com please. I need to prove the equation to my boss.
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ChenBeier
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This is basic chemistry. Amines react with acids. There is nothing to approve. Look in a chemist book.

Last edited by ChenBeier on Fri Jul 20, 2018 6:56 am; edited 1 time in total
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hoangnga0896
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Okay. I got it. Thank you very much.
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hoangnga0896
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I've been looking for the name of the product you did type but there was no result. Are there any other reactions?
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hoangnga0896
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There is only reaction between MEA and phosphoric acid (H3PO4) either.
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ChenBeier
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Do we talk about phosphoric acid H3PO4 or phosphorous acid H3PO3 .

The product is Bis(Hydroxyethyl)-ammoniumphosphite
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hoangnga0896
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MEA + H3PO3
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