Process for stabilizing fast pyrolysis oil, and stabilized fast pyrolysis oil

Abstract

A process for stabilizing pyrolysis oil includes hydrogenating fast pyrolysis oil with hydrogen reactant in the presence of ruthenium metal catalyst at a temperature of at least about 70° C. and at a pressure of at least about 600 psig to form a hydrogenated fast pyrolysis oil exhibiting an increase in viscosity of less than 10% after accelerated stability testing at 80° C. for 24 hours. The resulting hydrogenated fast pyrolysis oil can be characterized as stabilized to viscosity increase, and can be provided as a bio fuel oil.

1 . A process for stabilizing fast pyrolysis oil comprising:
 (a) hydrogenating fast pyrolysis oil with hydrogen reactant in the presence of ruthenium metal catalyst at a temperature of at least about 70° C. and at a pressure of at least about 600 psig to form a hydrogenated fast pyrolysis oil exhibiting an increase in viscosity of less than 10% after accelerated stability testing at 80° C. for 24 hours.   
     
     
         2 . A process according to  claim 1 , wherein the pyrolysis oil comprises a result of heating lignocellulosic materials to a temperature of about 400° C. to about 600° C. for less than three seconds. 
     
     
         3 . A process according to  claim 1 , wherein the step of hydrogenating fast pyrolysis oil comprises hydrogenating fast pyrolysis oil at a temperature of about 70° C. to about 100° C. 
     
     
         4 . A process according to  claim 1 , wherein the step of hydrogenating fast pyrolysis oil comprises hydrogenating pyrolysis oil at a temperature of about 75° C. to about 90° C. 
     
     
         5 . A process according to  claim 1 , wherein the step of hydrogenating fast pyrolysis oil comprises hydrogenating pyrolysis oil at a pressure of about 600 psig to about 2000 psig. 
     
     
         6 . A process according to  claim 1 , wherein the step of hydrogenating fast pyrolysis oil comprises hydrogenating pyrolysis oil at a pressure about 700 psig to about 1500 psig. 
     
     
         7 . A process according to  claim 1 , wherein the space velocity, expressed as liters of the fast pyrolysis oil per liter of the ruthenium catalyst per hour is about 0.3 L/L/hr to about 1.0 L/L/hr. 
     
     
         8 . A process according to  claim 7 , wherein the space velocity is about 0.4 L/L/hr to about 0.7 L/L/hr. 
     
     
         9 . A process according to  claim 1 , wherein the step of hydrogenating fast pyrolysis oil comprises hydrogenating fast pyrolysis oil to provide a reduction of carbonyl content by at least 10%. 
     
     
         10 . A process according to  claim 1 , wherein the step of hydrogenating fast pyrolysis oil comprises hydrogenating fast pyrolysis oil to provide a deoxygenation by at least 5%. 
     
     
         11 . A hydrogenated bio fuel comprising a result of hydrogenating fast pyrolysis oil with hydrogen reactant in the presence of ruthenium metal catalyst at a temperature of at least about 70° C. and at a pressure of at about 600 psig, the hydrogenated fast pyrolysis oil exhibiting a stability to viscosity increase of less than 10% after accelerated stability testing at 80° C. for 24 hours. 
     
     
         12 . A hydrogenated bio fuel according to  claim 1 , wherein the pyrolysis oil comprises a result of heating lignocellulosic materials to a temperature of about 400° C. to about 600° C. for less than three seconds. 
     
     
         13 . A hydrogenated bio fuel according to  claim 1 , wherein fast pyrolysis oil has been hydrogenated at a temperature of about 70° C. to about 100° C. 
     
     
         14 . A hydrogenated bio fuel according to  claim 1 , wherein the fast pyrolysis oil has been hydrogenated at a temperature of about 75° C. to about 90° C. 
     
     
         15 . A hydrogenated bio fuel according to  claim 1 , wherein the fast pyrolysis oil has been hydrogenated at a pressure of about 600 psig to about 2000 psig. 
     
     
         16 . A hydrogenated bio fuel according to  claim 1 , wherein the fast pyrolysis oil has been hydrogenated at a pressure about 700 psig to about 1500 psig. 
     
     
         17 . A hydrogenated bio fuel according to  claim 1 , wherein the hydrogenated fast pyrolysis oil exhibits a carbonyl content reduction by at least 10% compared to the fast pyrolysis oil prior to hydrogenation. 
     
     
         19 . A hydrogenated bio fuel according to  claim 1 , wherein the hydrogenated fast pyrolysis oil exhibits a deoxygenation by at least 5% compared to the fast pyrolysis oil prior to hydrogenation.