Adblue (Aus32) Urea Solution, Diesel Exhaust Fluid (Def)

11. OTHER INDUSTRIES 11.01.00. AUTOMOTIVE 11.01.01. AUTOMOTIVE GRADE UREA SOLUTION PROCESS: ADBLUE AND DEF

OTHER INDUSTRIES APPLICATION NOTE 11.01.01 AUTOMOTIVE GRADE UREA SOLUTION PROCESS: ADBLUE AND DEF

ADBLUE (AUS32) UREA SOLUTION, DIESEL EXHAUST FLUID (DEF)

Typical end products Automotive grade urea solution. Application Chemical curve: Automotive grade urea R.I. per Conc% b.w. at Ref. Temp. of 20˚C As the name AUS32 suggests, AdBlue is made by using urea mixed with demineralized water resulting in a 32.5 % aqueous urea solution. It is colorless, non- toxic and safe to handle.

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. The process temperature is 25-50 °C (77-122 °F). After mixing, the urea solution AdBlue 32.5 % is cooled and transferred to the storage tanks.

Instrumentation and installation Introduction The K-Patents refractometer PR-43-GP is used to The automotive urea AdBlue, also known by the measure the concentration of urea solution AdBlue generic name Diesel Exhaust Fluid (DEF), is the 32.5 % after the heat exchanger before it is transferred registered trademark for AUS32 (Aqueous Urea to storage tanks. Solution 32.5 %). The refractometer is mounted in the outlet pipe before AdBlue is used as a reagent to reduce the harmful storage to control the concentration of the urea mix. emissions from the internal diesel combustion The concentration is maintained between 31.8 % engines. In order to use AdBlue, the vehicle must be and 33.2 % b.w. (32.5 % optimum) with automatic equipped with a Selective Catalytic Reduction (SCR) adjustment of the demineralized water feed. The system. The fluid is passed through the SCR and into lowest freezing point for urea is around -11°C (12°F) the exhaust. at the concentration of 32.5 % by weight.

The K-Patents refractometer provides Ethernet and 4-20 mA output signals for automatic and

Other Industries | Automotive OTHER INDUSTRIES APPLICATION NOTE 11.01.01 AUTOMOTIVE GRADE UREA SOLUTION PROCESS: ADBLUE AND DEF

real-time control of the valves of concentrated urea Typical measurement range in this application is and demineralized water streams. The control 0-40 %. provided by the refractometer ensures the optimal concentration is always achieved.

When two or more measurements are needed, the K-Patents Multichannel User Interface (MI) provides multiple connectivity with one transmitter (up to 4 refractometers), thus reducing the investment cost.

Instrumentation Description K-Patents Process Refractometer PR-43-GP is a general industrial refractometer for pipes and vessel installations. The PR-43-GP can be installed with 2, 3 and 4 inch flange and 3 inch Sandvik L coupling process connections and a variety of flow cells for pipe sizes of 1 inch and larger.

User Interface Selectable multichannel MI, compact CI or a web-based WI user interface options allow the user to select the most preferred way to access and use the refractometer measurement and diagnostics data.

Measurement range Refractive Index (nD) 1.3200 – 1.5300, corresponding to 0-100 % by weight.

Other Industries | Automotive