I am a chemist by training and know what I am talking about. Urea is made by your body as a waste product, filtered out by your kidneys and is a major part of the resulting urine you secrete.
Urea levels in urine are directly related to protein consumption and kidney health.
You're only mentioning one type of urea.
Urea is an organic chemical compound, or the waste produced by the body after metabolizing protein. But since 1828, German scientist Friedrich Wöhler invented the process to create the synthetic version of urea. In 1870 the process of producing urea through dehydrating ammonium carbamate under conditions of high heat and pressure was invented. So yes, urea can be obtained from urine, but lets find out why Diesel Exhaust Fluid is not just urine and water.
I will be comparing the material data sheets of both automotive grade urea vs human urine.
According to wikipedia, “Human urine is an aqueous solution of greater than 95% water, with the remaining constituents, in order of decreasing concentration urea 9.3 grams/L, chloride 1.87 grams/L, sodium 1.17 grams/L, potassium 0.750 grams/L, creatinine 0.670 grams/L and other dissolved ions, inorganic and organic compounds.” Read the full descriptionhere.Diesel Exhaust Fluid uses automotive grade urea, at 32.5% concentration. This urea contains , 0.3% Biuret maximum, 0.5 % magnesium max , 0.5 % calcium max, 0.5% phosphate max, 0.5% iron max,0.5% potassium maximum.
When comparing the two there are various differences:
Human urine only contains 9.3 grams per liter of urea concentrationHuman urine also contains chloride, sodium , potassium , creatinine and other dissolved ionsHuman urine is 95% water, which is also full of ions and minerals
The water needed to create Diesel Exhaust Fluid has to be de-ionized and de-mineralized , a process that only a highly specialized filtration machine can achieve.
From all this information we can conclude that even though urine has urea, it is not the correct concentration nor does it have the purity needed. The water that comes from urine is also full of ions and minerals which make it very low quality water.
Diesel Exhaust Fluid is highly concentrated and very pure urea plus de-ionized water .The standards for Diesel Exhaust Fluid are very specific and can be foundhere.
I hope that this blog has been informative, highlighting the differences between urine and Diesel Exhaust Fluid.Please do not urinate in your DEF tank, the SCR system will be damaged and it will cost thousands of dollars to repair.
I won't drink either one. LOL