Method of hydrogasification of biomass to methane with low depositable tars
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United States of America Patent
Stats
-
Mar 18, 2014
Grant Date -
Jul 4, 2013
app pub date -
Jan 25, 2013
filing date -
Sep 3, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for converting lignocellulosic biomass to a useful fuel is disclosed in a process sequence resulting in low levels of depositable tars in an output gas stream. One disclosed embodiment comprises performing a sequence of steps at elevated pressure and elevated hydrogen partial pressure, including fast (or flash) hydropyrolysis of a lignocellulosic biomass feed followed sequentially with catalytically enhanced reactions for the formation of methane operating at moderate temperatures of from about 400° C. to about 650° C. under moderately elevated pressure (about 5 atm to about 50 atm). A temperature rise in the catalyst above pyrolysis temperature is achieved without the addition of air or oxygen. Gas residence time at elevated temperature downstream of methane formation zones extends beyond the time required for methane formation. This sequence results in low tar deposit levels. The catalyst promotes preferential formation of methane and non-deposit forming hydrocarbons, and coke re-gasification.
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International Classification(s)
- 2013 Application Filing Year
- C07C Class
- 3080 Applications Filed
- 2671 Patents Issued To-Date
- 86.73 % Issued To-Date
Cited Art Landscape
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- 0 Citation Count
- C07C Class
- 0 % this patent is cited more than
- 11 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Sep 18, 2025 |
