How do you convert 100 gallons of 32 percent UAN to 28 percent UAN?

Answer 1

32% has a density of 11.04#/gal so 100 gal=1104#.

1104#*32%=353.28# of Nitrogen

To convert 353.28# of Nitrogen into a 28% solution instead of 32% you must divide the #of nitrogen by the new solution value to get total pounds of new soultion and the ability to subtraced the two values to determine the total dilutant needed:

353.28#N in 28% solution would be 353.28/28%=1261.71# 28% solution

1261.71# 28% -1104# 32%= 157.71# of dilutant (water) needed to make 28% soultion.

To figure out what percentace 32% is of the solution you divide the 32% solution weight by the new soultion weight:

1104/1261.71=.875 28% therefore is 87.5% of 32% by weight not volume.

To solve the problem you need to divide the original weight of 32% by its percentage in the new solution to get the total solution weight of the new solution and then subtract the original solution weight to get the amount of dilutant needed to dilute 32% to a 28% solution. Do the following:

(1104/.875)-1104=1261.71# of 28% solution. To dilulte 100 gal of 32% you will need to add water to get to the final weight of 28% solution

1261.71# 28%-1104# 32%=157.71# Dilutant (18.91 gal)

Finished product you will have 118.91gal of 28% weighing 1261.71#

28% solution will be 10.611#/gal

The fomula for this problem would be ((Galons 32% * 11.04)/.875)-(gal 32% * 11.04)= dilutant need. (gal 32% * 11.04)+ dilutant = # of 28% solution.

Answer 2

32% UAN is 45% ammonium nitrate (AN), 35% urea and 20% water. 28% UAN is 40% AN, 30% urea and 30% water.

If one considers the numbers as gallons of each substance, 100 gallons of 32% UAN contains 45 gallons of AN, 35 gallons of urea and 20 gallons of water. To get to 28% UAN, one needs to remove 5 gallons of AN and of urea and replace them with 10 gallons of water. 1 gallon of 32% contains 0.45 gallon of AN, 0.35 gallon of urea and 0.2 gallon of water.

First, let's calculate for AN. To remove 5 gallons of AN from the 100-gallon container, one must draw out 5/0.45 = 11.1 gallons of the solution. The problem: the 11.1 gallons of solution contain only 3.89 gallons of urea, whereas the conversion requires that 5 gallons be removed. This can be a real pain.

Let's instead remove 5 gallons of urea. We must draw out 14.29 gallons of solution. That removes 6.43 gallons of AN. If one has 1.43 gallons of pure AN, he can then add it to the tank and fill it with water.

Conclusion: converting 32% to 28% is not something that can be easily done. In the end it would be easier to buy 100 gallons of 28% and sell the 32% to someone who needs it.