Hydrorefining method for hydrocarbon oil

Abstract

The invention provides a hydrocarbon oil hydrorefining method, characterized by including providing a mixture of a heavy hydrocarbon oil and a hydrocarbon oil exhibiting an effect of increasing dissolved hydrogen concentration; mixing the oil mixture, which is subjected to hydrorefining, with hydrogen; and causing the resultant mixture to pass through a reactor for carrying out hydrorefining. The method can enhance performance in hydrorefining of the heavy oil.

1 . A hydrocarbon oil hydrorefining method, comprising providing an oil mixture of a heavy hydrocarbon oil and a dissolved-hydrogen-concentration-increasing hydrocarbon oil; mixing the oil mixture with hydrogen; and causing the resultant mixture to pass through a reactor for carrying out hydrorefining. 
   
   
       2 . A hydrocarbon oil hydrorefining method as described in  claim 1 , wherein the oil mixture of a heavy hydrocarbon oil and a dissolved-hydrogen-concentration-increasing hydrocarbon oil has a dissolved hydrogen concentration which is 1.1 times or more the highest possible hydrogen concentration of the heavy hydrocarbon oil. 
   
   
       3 . A hydrocarbon oil hydrorefining method as described in  claim 1 , wherein the heavy hydrocarbon oil is one or more species selected from among vacuum residual oil, vacuum gas oil, atmospheric residual oil, topped crude oil, crude oil, deasphalted oil, coal-liquefied oil, oil obtained from oil sand, and oil obtained from oil shale. 
   
   
       4 . A hydrocarbon oil hydrorefining method as described in  claim 1 , wherein the dissolved-hydrogen-concentration-increasing hydrocarbon oil is entirely or partially contained in a liquid phase under reactor conditions. 
   
   
       5 . A hydrocarbon oil hydrorefining method as described in  claim 1 , wherein the effect of increasing dissolved hydrogen concentration is estimated on the basis of the equilibrium of hydrogen between gas and liquid in the reactor. 
   
   
       6 . A hydrocarbon oil hydrorefining method as described in  claim 1 , wherein the dissolved-hydrogen-concentration-increasing hydrocarbon oil is additionally fed, as a quenching oil, into the reactor. 
   
   
       7 . A hydrocarbon oil hydrorefining method as described in  claim 1 , wherein the dissolved-hydrogen-concentration-increasing hydrocarbon oil is one or more species selected from among a straight-run kerosene fraction, a straight-run light gas oil fraction, a straight-run heavy gas oil fraction, cracked oil obtained from an FCC unit, and thermally cracked oil obtained from a coker unit. 
   
   
       8 . A hydrocarbon oil hydrorefining method as described in  claim 1 , wherein the hydrorefining includes one or more steps selected from among a hydrodemetallization step, a hydrodesulfurization step, a hydrocracking step, a hydrodenitrogenation step, and a hydrodearomatization step. 
   
   
       9 . A hydrocarbon oil hydrorefining method as described in  claim 1 , wherein the hydrorefining is carried out under the following conditions: a reaction temperature of 300 to 450° C., a hydrogen partial pressure of 5.1 to 25.3 MPa(G), a hydrogen/oil ratio of 200 to 2,000 Nm 3 /kL, and a liquid hourly space velocity of 0.05 to 10 hr −1 . 
   
   
       10 . A hydrocarbon oil hydrorefining method as described in  claim 1 , wherein the hydrorefining is carried out under the following conditions: a reaction temperature of 330 to 430° C., a hydrogen partial pressure of 10.1 to 20.3 MPa(G), a hydrogen/oil ratio of 500 to 1,000 Nm 3 /kL, and a liquid hourly space velocity of 0.05 to 10 hr −1 .