Recycling Method of Sludge Recovery Oil

Abstract

Provided is a recycling method of recovery oil including: a) recovering sludge accumulated in a crude oil tank; b) separating the sludge into recovery oil, water, and sediment; and c) mixing the recovery oil with crude oil and performing fractional distillation on a mixture of the recovery oil and the crude oil.

What is claimed is: 
     
         1 . A recycling method of recovery oil comprising the steps of:
 a) recovering sludge accumulated in a crude oil tank;   b) separating the sludge into recovery oil, water, and sediment; and   c) mixing the recovery oil with crude oil and performing fractional distillation on a mixture of the recovery oil and the crude oil.   
     
     
         2 . The recycling method of recovery oil of  claim 1 , wherein in step c), the recovery oil and the crude oil are mixed with each other by any one or two or more selected among
 c1) a method of mixing the recovery oil with the crude oil using a line mixer and transferring the mixture to a charge pump;   c2) a method of periodically mixing the recovery oil with the crude oil and transferring the mixture to the charge pump; and   c3) a method of mixing the recovery oil with the crude oil passing through the charge pump and transferring the mixture to a desalter.   
     
     
         3 . The recycling method of recovery oil of  claim 2 , wherein c1) includes:
 c1-1) mixing the recovery oil with the crude oil using the line mixer; and   c1-2) transferring the crude oil mixed with the recovery oil to the charge pump.   
     
     
         4 . The recycling method of recovery oil of  claim 3 , wherein the crude oil passing through step c1-2) is again sent to step c1-1) and is circulated. 
     
     
         5 . The recycling method of recovery oil of  claim 2 , wherein in step c2), a process of stopping the supply of the recovery oil for 0.2 to 1 hour after the recovery oil is supplied and mixed with the crude oil for 0.5 to 3 hours is repeated. 
     
     
         6 . The recycling method of recovery oil of  claim 2 , wherein the crude oil of c3) is preheated to a temperature of a pour point or more of the recovery oil. 
     
     
         7 . The recycling method of recovery oil of  claim 6 , wherein the crude oil is preheated to a temperature of 90 to 150° C. 
     
     
         8 . The recycling method of recovery oil of  claim 2 , wherein 0.1 to 2 parts by weight of the recovery oil are mixed with 100 parts by weight of the crude oil. 
     
     
         9 . The recycling method of recovery oil of  claim 1 , wherein step a) is performed by any one or two or more selected among a mechanical separating method, a thermal separating method, a solvent extracting method, a sound wave separating method, and a chemical separating method.