If the NxOy gases produced were bubbled back through the GABA + H2O + Na+ + H3O+ + CL- + NO3- reaction solution in a closed system...
Fit at the mouth of a 1 liter flask a pressure-driven, accordian style bladder/gas balloon. When the volume of gas increases pressure, a pressure valve opens, the bladder deflates, and the volume of gas is directed via a glass tube down into and bubbled through the solution.
The piped gases would stir the reaction solution and perhaps replenish the reaction with H3O+ via H2O(g) returning and ionizing with dissolved NxOy gasses.
External cooling would be even more important with this setup.
Wouldn't this make the reaction more "closet," or at least "bathroom," friendly? Does such a piece of equip. exist? Would it help speed up the reaction or require less NaNO2?
Or, will it hinder GBL production?