stage involves carboalkoxylation of ethylene to produce methyl propionate (MeP):
:The MeP synthesis is conducted in a continuous-stirred tank reactor at moderate temperature and pressure using proprietary agitation and gas-liquid mixing arrangement.

In a second set of reactions, MeP is condensed with formaldehyde in a single heterogeneous reaction step to form MMA:
:

The reaction of MeP and formaldehyde

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