Temperatures and LHSV at Naphtha Hydrotreater Reactor

LHSV is the liquid hourly space velocity, which is the ratio of liquid volume flow per hour to catalyst volume. LHSV is inversely proportional to residence time. As the flow rate increases, the LHSV increases. In most systems with a fixed catalyst volume & activity, temperature is increased to offset the negative reaction consequences of increasing LHSV. In systems that can replace catalyst and/or regenerate it online, an increase in catalyst make up rate can also be used to offset an increase in LHSV.
It signifies the residence time of feed in the reactor. Higher the value lower the reaction rate. It is dependent on the reaction kinetics.

Theoretically you can can calculate either of the one parameter if you know the other 3 parameters but reactor inlet temperature at LHSV2 is adjusted according to the product quality requirement. The actual temperature might not be the same as theoretical. Normally, when feed rates to reactor are adjusted the reactor inlet temperature does no go below the minimum defined temperature by the designer and temperature can be increased at high LHSVs as required to meet the product quality.