Converting PPh to Kgh

Question

How do you convert parts per hour to kg per hour?

Answer 1

What I like to do for any conversion is start with what I have in a ratio on the far left and what I NEED on the far right.

x parts = = ___kg

hr hr

Then I use different relationships or ratios to "convert" . Now, we have hrs in the bottom, so that is great. We just have to figure out how many kg are in a part.

This is typically done by finding OTHER relationships to find the path from parts to kg. Examples include density which converts mass to volume. We also have concentrations and stoichiometric ratios.

SOOO, what is a ratio you can think of that involves parts?

As a ChE, we usually speak in terms of parts per million (PPM). A PPM is one milligram/L of solute. In other words, it is how many kilograms there are of "stuff" or solute per one million liters of solvent. In other words 5 PPM = 5 kg/ML (megaliter).

Now, we need to distinguish some things, specifically our "kg". Your question is a bit vague and requires context. What other information are you given? Are you given a density of solution, a volumetric flow rate, a concentration in units of PPM? In addition, are you looking for kg/hr of solution or of solute?

The approach of finding relationships will not change, but which relationships we need will be drastically different based on how the original question is posed.