METHOD FOR PREPARING LIQUID FUEL BY USING y- VALEROLACTONE

Abstract

The present invention provides a method for preparing liquid fuel by using γ-valerolactone, and steps are as follows: placing a phosphoric acid solution and γ-valerolactone in a reaction tank for reaction at 220-260° C. for 3-12 hours, cooling to room temperature to obtain a liquid fuel. Using the phosphoric acid solution as a catalyst, γ-valerolactone can be catalytically converted in one step at a mild temperature (220-260° C.) to produce light and heavy oil products with high calorific value, with a total oil yield up to 33.5 wt %. This technique is simple in process flow and convenience to operate, and has industrial application prospects. Compared with other technologies for preparing high-grade oil products by catalytically converting γ-valerolactone, using the phosphoric acid solution for catalytic conversion has the obvious advantages that no expensive hydrogen needs to be provided externally, the reaction process is simple, and the temperature is mild.

1 . A method for preparing liquid fuel by using γ-valerolactone, characterized in that, the method comprises steps as follows:
 placing a phosphoric acid solution and γ-valerolactone in a reaction tank for reaction at 220-260° C. for 3-12 hours, cooling to room temperature to obtain a liquid fuel. 
 
     
     
         2 . The method for preparing liquid fuel by using γ-valerolactone according to  claim 1 , wherein the phosphoric acid solution has a mass concentration of 100%. 
     
     
         3 . The method for preparing liquid fuel by using γ-valerolactone according to  claim 1 , wherein a mass ratio of γ-valerolactone to the phosphoric acid solution is 1:(2-100). 
     
     
         4 . The method for preparing liquid fuel by using γ-valerolactone according to  claim 1 , wherein placing the phosphoric acid solution and γ-valerolactone in the reaction tank and heating up to 220-260° C. at 5-10° C./min. 
     
     
         5 . A method for preparing liquid fuel by using γ-valerolactone according to  claim 1 , wherein the method comprises steps as follows:
 placing γ-valerolactone and the phosphoric acid solution in the reaction tank for reaction at 220-260° C. for 3-12 hours, after complete reaction, cooling to room temperature to obtain the liquid fuel; 
 preforming rotary evaporation on the liquid fuel cooled in the step (1) to obtain an oil-water mixture and a phosphoric acid mixture, performing oil-water separation on the oil-water mixture to obtain light oil, and the rotary evaporation is performed at a temperature of 240° C., under a pressure of −0.09 MPa; and 
 performing extraction on the phosphoric acid mixture obtained in the step (2) with dichloromethane, distilling a dichloromethane solution obtained after the extraction by a rotary evaporator to obtain dichloromethane and heavy oil, and the rotary evaporator is operated at a temperature of 60° C., under a pressure of −0.09 MPa. 
 
     
     
         6 . The method for preparing liquid fuel by using γ-valerolactone according to  claim 5 , wherein the method comprises a step that at normal pressure, the light oil has a boiling point ≤245° C., and the heavy oil has a boiling point ≥245° C. 
     
     
         7 . A method for preparing liquid fuel by using γ-valerolactone according to  claim 2 , wherein the method comprises steps as follows:
 placing γ-valerolactone and the phosphoric acid solution in the reaction tank for reaction at 220-260° C. for 3-12 hours, after complete reaction, cooling to room temperature to obtain the liquid fuel; 
 preforming rotary evaporation on the liquid fuel cooled in the step (1) to obtain an oil-water mixture and a phosphoric acid mixture, performing oil-water separation on the oil-water mixture to obtain light oil, and the rotary evaporation is performed at a temperature of 240° C., under a pressure of −0.09 MPa; and 
 performing extraction on the phosphoric acid mixture obtained in the step (2) with dichloromethane, distilling a dichloromethane solution obtained after the extraction by a rotary evaporator to obtain dichloromethane and heavy oil, and the rotary evaporator is operated at a temperature of 60° C., under a pressure of −0.09 MPa. 
 
     
     
         8 . The method for preparing liquid fuel by using γ-valerolactone according to  claim 7 , wherein the method comprises a step that at normal pressure, the light oil has a boiling point ≤245° C., and the heavy oil has a boiling point ≥245° C. 
     
     
         9 . A method for preparing liquid fuel by using γ-valerolactone according to  claim 3 , wherein the method comprises steps as follows:
 placing γ-valerolactone and the phosphoric acid solution in the reaction tank for reaction at 220-260° C. for 3-12 hours, after complete reaction, cooling to room temperature to obtain the liquid fuel; 
 preforming rotary evaporation on the liquid fuel cooled in the step (1) to obtain an oil-water mixture and a phosphoric acid mixture, performing oil-water separation on the oil-water mixture to obtain light oil, and the rotary evaporation is performed at a temperature of 240° C., under a pressure of −0.09 MPa; and 
 performing extraction on the phosphoric acid mixture obtained in the step (2) with dichloromethane, distilling a dichloromethane solution obtained after the extraction by a rotary evaporator to obtain dichloromethane and heavy oil, and the rotary evaporator is operated at a temperature of 60° C., under a pressure of −0.09 MPa. 
 
     
     
         10 . The method for preparing liquid fuel by using γ-valerolactone according to  claim 9 , wherein the method comprises a step that at normal pressure, the light oil has a boiling point ≤245° C., and the heavy oil has a boiling point ≥245° C. 
     
     
         11 . A method for preparing liquid fuel by using γ-valerolactone according to  claim 4 , wherein the method comprises steps as follows:
 placing γ-valerolactone and the phosphoric acid solution in the reaction tank for reaction at 220-260° C. for 3-12 hours, after complete reaction, cooling to room temperature to obtain the liquid fuel; 
 preforming rotary evaporation on the liquid fuel cooled in the step (1) to obtain an oil-water mixture and a phosphoric acid mixture, performing oil-water separation on the oil-water mixture to obtain light oil, and the rotary evaporation is performed at a temperature of 240° C., under a pressure of −0.09 MPa; and 
 performing extraction on the phosphoric acid mixture obtained in the step (2) with dichloromethane, distilling a dichloromethane solution obtained after the extraction by a rotary evaporator to obtain dichloromethane and heavy oil, and the rotary evaporator is operated at a temperature of 60° C., under a pressure of −0.09 MPa. 
 
     
     
         12 . The method for preparing liquid fuel by using γ-valerolactone according to  claim 11 , wherein the method comprises a step that at normal pressure, the light oil has a boiling point ≤245° C., and the heavy oil has a boiling point ≥245° C.