Dehydrate (concentrate) 50% isopropyl alcohol

I took 50% isopropyl alcohol and concentrated it with salt. 50% doesn't burn. After concentration it readily burns. The salt can be reclaimed by evaporating the salt water solution to be used again. I used Potassium chloride (water softener salt or no-salt dietary supplement) instead of sodium chloride since I have a 40 pound bag of it.