A novel condensing reactor for conversion
of CO2 to
methanol is characterized under forced convective conditions, both
experimentally and by modeling. The goal of the study is to optimize
the operation conditions and identify limitations of the reactor concept.
Experimental results show that productivity is limited by reaction
equilibrium and mass transport at high temperature (>250 °C),
while reaction kinetics limit productivity at low temperature (<220
°C). Further analysis of the liquid out/gas in concept is performed
by an adiabatic 1D-reactor model in combination with an equilibrium
flash condenser model. To enable autothermal operation, internal heat
exchange is required. It was found that a condenser temperature below
70 °C is required to avoid excessive heat exchange areas. Increasing
the length of the catalyst section, and with this the overall reactor
size, will increase the conversion per pass, until equilibrium is
reached. On the other hand, the internal recycle ratio is decreased
and thus less heat exchange and condenser area is required, decreasing
overall reactor size. With the model developed, overall reactor performance
can be optimized by finding the most optimal combination of reactor
and condenser conditions in the recycle system.