Naptha hydrotreater pressure drop normalization

[aabumady]

I have naphtha hydrotreating reactor.I need to monitor the reactor pressure drop trend.I need to normalize as it is affected by the feed rate and the recycle gas.Actually, when I normalize it to the feed rate only, the recycle gas effect is neglected.when I normalize it to the recycle gas, the feed rate effect is neglected.

It will be appreciated, if any body can help me to normalize it regarding both of the feed rate and the recycle gas to obtain a reliable trend.

Thanks.