Weight space velocity

Weight hourly space velocity: which is the mass of aqueous feed solution per unit mass of catalyst per hour. ), that is, WHSV, also known as mass air velocity. Corresponding to this is the volume space velocity. Reactor space velocity: Under specified conditions, the volume of material entering the reactor per unit time is equivalent to several times the volume of the reactor. Abbreviated as airspeed. The amount of catalyst loaded in the reactor depends on the quantity and quality of the feedstock designed, as well as the conversion rate to be achieved. The parameter that is typically used to relate the amount of catalyst to the amount of feedstock to be processed is the liquid space-time velocity. Space-time velocity refers to the volume (or weight) of feedstock that passes through a unit volume (or weight) of catalyst per unit of time. The liquid space-time velocity (LHSV) can be defined as follows: LHSV (h-1) = Total feed rate at the reactor inlet (m3/h) / Total volume of catalyst (m3). There are several ways to express space-time velocity, all of which use the unit h-1 to indicate the processing capacity of the catalyst. Volume space-time velocity: Volume of feed per hour (either liquid, LHSV, or gas, GHSV) / Volume of catalyst loaded in the reactor; Weight space-time velocity (WHSV): Weight of feed per hour (liquid or gas) / Weight of catalyst loaded in the reactor. The formulas for calculating space-time velocity are as follows: Volume space-time velocity = Standard volumetric flow rate of the feedstock (usually based on the density at 20 degrees Celsius) / Volume of catalyst in the reactor; Mass space-time velocity = Mass flow rate of the feedstock / Mass of catalyst in the reactor