As an expert in the field of automotive chemistry, I can provide you with a detailed explanation regarding the composition of DEF fluid and the misconceptions surrounding its origin.

Diesel Exhaust Fluid (DEF), also known as AdBlue® in Europe, is a urea-based solution that is used in diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems to reduce harmful nitrogen oxide (NOx) emissions. The primary purpose of DEF is to chemically react with the NOx gases in the exhaust stream, converting them into nitrogen (N2), water (H2O), and small amounts of carbon dioxide (CO2), which are less harmful to the environment.

The composition of DEF is quite straightforward. It is made up of high-purity urea and deionized water. The urea is a chemical compound that can be synthesized from ammonia and carbon dioxide, and it is not derived from any animal byproducts, including pig urine. The deionized water is simply water that has had its mineral ions removed, ensuring that the solution is free from impurities that could interfere with the SCR system's operation.

The misconception that DEF is made from pig urine likely stems from the fact that urea is a natural component found in the urine of many animals, including pigs. Urea is a waste product of protein metabolism, and it is excreted by the kidneys to help maintain the body's balance of water and electrolytes. However, the urea used in DEF is not sourced from animal urine. Instead, it is industrially produced through a chemical process that involves the reaction of ammonia with carbon dioxide.

It is important to clarify that the term "pig urine" when referring to DEF is a colloquialism and not an accurate description of the fluid's composition. The majority of DEF available on the market is not made using animal byproducts. The name has stuck, perhaps due to the historical use of urea in fertilizers, which was once derived from animal waste. However, modern production methods for DEF have evolved to ensure a high level of purity and consistency, making it safe and effective for use in automotive applications.

In conclusion, DEF fluid is a carefully formulated solution designed to reduce harmful emissions from diesel engines. It is not made from pig urine or any other animal byproducts. The urea in DEF is synthesized through a chemical process, and the water is deionized to ensure purity. The use of DEF is a critical component of the SCR system, which helps to protect the environment by reducing the emission of NOx gases.

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This fluid is composed of Urea and deionized water. Pig urine (or cow, horse, even human) is largely urea and many people refer to DEF as pig urine even though the majority of DEF on the market is not made using animal byproducts. Regardless, the name has stuck.Apr 28, 2015read more >>