Diesel exhaust fluid formulation that reduces urea deposits in exhaust systems

Patent metadata

Field	Value
Publication number	US-8961818-B2
Application number	US-201313919924-A
Country	US
Kind code	B2
Filing date	Jun 17, 2013
Priority date	Jun 17, 2013
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

A Diesel Exhaust Fluid (DEF) that includes urea, demineralized water and between 5 and 300 ppm formaldehyde, this formulation of DEF include less than 0.6 ppm of phosphates, calcium, iron, aluminum, magnesium, sodium, and potassium, the formulation also includes less than 0.3 ppm copper, zinc, chromium, and nickel. This formulation of DEF reduces the accumulation of urea deposit in the diesel exhaust system relative to other formulation of specification grade DEF that include less formaldehyde.

First claim

We claim:

1. A formulation for reducing oxides of nitrogen in diesel engine exhaust, comprising:
about 19.0 wt. % to about 40 wt. % urea;
at least 0.0010 wt. % formaldehyde; and
demineralized water.

2. The formulation according to claim 1 , including:
no more than 0.6 ppm of phosphates, calcium, iron, aluminum, magnesium, sodium and potassium; and
no more than 0.3 ppm copper, zinc, chromium, and nickel.

3. The formulation accordi…

Assignees

• Deere & Co

Inventors

• Ayyappan Ponnaiyan
• Dou Danan
• Harris Thomas Miller

Classifications

• F01N3/2066 Primary

  Mechanical Engineering · mapped topic

• B01D53/9431 Primary

  Operations & Transport · mapped topic

• B01D53/9409

  Operations & Transport · mapped topic

• B01D2251/21

  Operations & Transport · mapped topic

• B01D2258/012

  Operations & Transport · mapped topic