is calculated based on mep produced as follows 1 ton in moles mep mole pd is calculated by dividing the mep produced in moles hr by the palladium fed in gmoles hr the palladium fed is calculated knowing the concentration of palladium in the catalyst feed and the rate of addition to the reactor 2 an example calculation using the data from table 1 column 1 is as follows u2014 i mep produced 15 5 tonnes hr ii mep produced 176 14 u00d7 10 moles hr assumes mw mep 88 iii catalyst feed rate 16 32 kg hr iv pd concentration in catalyst feed 93 0 ppm pd 1 518 g hr v pd feed rate 1 43 u00d7 10 u2212 2 moles pd hr assumes mw pd 106 4 vi ton moles mep produced moles pd fed 12 48 million moles mep mole pd by contrast operating above 5 co in the headspace resulted in rapid deterioration in catalyst performance as measured by ton on the other hand operating above an ethylene co ratio of 1000 1 led to a very low rate of reaction and hence low productivity infra red analysis of the headspace gas and outgoing flow rate were measured by an emerson rosemount cat 100 ir analyser all liquid.