Gas introduction for urea solution freeze protection
US10309280B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 2015 |
| Grant date | Jun 4, 2019 |
| Priority date | — |
| Expiry date | Aug 11, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A selective catalytic reduction solution having urea, water and gas bubbles contained within the solution. In particular, the solution has a urea content that is present in an amount greater than 31% (m/m) mass fraction of material and gas bubbles in the solution in an amount between about 7% to about 9% of the volume of solution when the solution is at a pressure of about 1 bar absolute. When the selective catalytic reduction solution is pressurized to a range between 6 bar and 7.5 bar, the gas bubbles are in a range between about 1.33% to about 1.07% of the solution when the solution is pressurized. The presence of the gas bubbles provides an expansion volume for the urea solution, if the urea solution begins freezing due to cold temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.