Automotive Grade Urea Solution Process: AdBlue and DEF


The automotive urea AdBlue, also known by the generic name Diesel Exhaust Fluid (DEF), is the registered trademark for AUS32 (Aqueous Urea Solution 32.5 %). AdBlue is used as a reagent to reduce the harmful emissions from the internal diesel combustion engines. In order to use AdBlue, the vehicle must be equipped with a Selective Catalytic Reduction (SCR) system. The fluid is passed through the SCR and into the exhaust.

AdBlue is made by using urea mixed with demineralized water resulting in a 32.5 % aqueous urea solution. A stream of concentrated urea is blended with demineralized high purity water in a mixer. The ratio between the streams is carefully controlled to achieve the desired concentration.

Vaisala K-PATENTS® refractometer PR-43-GP is used to measure the concentration of urea solution AdBlue 32.5 % after the heat exchanger before it is transferred to storage tanks.

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Automotive Grade Urea Solution Process AdBlue and DEF

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