The hot vapour product stream exiting the converter contains the three methylamine products, reaction water and unreacted ammonia and methanol.
The individual quantities of each amine produced are determined by the converter’s feed composition. This in turn is a function of the amounts of each reactant and methylamine product recycled from distillation to join the fresh methanol and ammonia feed.
After passing through a heat recovery system and then a condenser, the process stream, now a liquid, progresses to the distillation stage.
The distillation system, comprising a number of columns in series, purifies and separates the crude methylamine products firstly by separating unreacted ammonia and recycling it to the amination stage.
Subsequent distillation then produces pure anhydrous TMA, MMA and DMA.
Residual methanol is extracted from the water and also recycles to the amination stage.
The ratio of the three final methylamine products is adjustable to suit particular market demands up to 100%. This is achieved through careful catalyst selection, along with manipulation of the reactor feed composition by adjusting the amounts of MMA, TMA and methanol recycled from distillation.
Our flexible plant technology can be tailored to produce methylamines product in anhydrous, and/or the more transportable aqueous form.