You can easily get the SO2 adduct in triethanolamine by conventional bubbling. But for this, it will be necessary to dilute TEA with some volatile solvent (toluene, acetone ...?), Since the viscosity of TEA greatly complicates the process. A source of SO2 can be, for example, metabisulfite heated to 150 C.
Naturally, DEA in this sense would be more interesting than TEA. But it's harder to get.
p.s. But I don't see a significant need to create an anhydrous composition. The modern HC-110 also now contains a concentrated aqueous solution of potassium sulfite. It will be obtained much easier (by heating potassium metabisulfite, or by reacting it with potassium hydroxide). In my humble opinion, this should not significantly affect the shelf life. However, there may be difficulties with freezing the concentrate - the precipitation of a crystalline precipitate.
Naturally, DEA in this sense would be more interesting than TEA. But it's harder to get.
p.s. But I don't see a significant need to create an anhydrous composition. The modern HC-110 also now contains a concentrated aqueous solution of potassium sulfite. It will be obtained much easier (by heating potassium metabisulfite, or by reacting it with potassium hydroxide). In my humble opinion, this should not significantly affect the shelf life. However, there may be difficulties with freezing the concentrate - the precipitation of a crystalline precipitate.
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