Ammonium hydroxide when heated
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Let’s discuss why, under high pressure and in a fully enclosed system, heating methylammonium in the synthesis tower results in the formation of urea, while heating it in the stripping tower causes it to decompose into ammonia and carbon dioxide
This is the basic principle of the urea reaction. Inside the synthesis tower, ammonium methoxide is dehydrated to produce urea; this is an endothermic reaction. Raising the temperature of the ammonium methoxide solution facilitates the forward progression of the reaction, and the heat required for this comes from the ongoing formation of ammonium methoxide. Inside the stripping tower, the ammonium methylate decomposition reaction takes place; therefore, a large amount of heat must be supplied along with the use of a stripping agent. There’s no need to explain the principle of stripping, right? As for whether methylammonium is dehydrated or decomposed, it depends on the equilibrium between its gas and liquid phases.
Different purposes lead to different principles. I suggest the original poster study the chapter on the most basic principles first, and then take another look at the question you asked; I believe they will gain a lot from it!