US2015065766A1PendingUtilityA1

Heavy Oils Having Reduced Total Acid Number and Olefin Content

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Assignee: DEHKISSIA SOUMAINEPriority: Aug 9, 2013Filed: Aug 5, 2014Published: Mar 5, 2015
Est. expiryAug 9, 2033(~7 yrs left)· nominal 20-yr term from priority
Inventors:Soumaine DehkissiaChristos ChronopoulosMichel ChornetJean Frechette
C10G 55/04C10G 67/02C10G 31/06C10G 67/14C10G 2300/308C10G 53/02C10G 9/007C10G 2300/203Y02P30/20C10G 3/40
42
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Claims

Abstract

A process for treating a heavy oil by heating a feedstock comprising a heavy oil in order to separate from the heavy oil a first fraction. The first fraction contains no more than 25% of the total number of acid groups of the heavy oil. A second fraction contains at least 75% of the total number of acid groups of the heavy oil. The second fraction then is treated under conditions that provide a heavy oil that has a total acid number, or TAN, that does not exceed 1.0 mg KOH/g, or is at least 50% lower than the total acid number prior to treatment, an olefin content that does not exceed 1.0 wt. %, and a p-value of at least 50% of the p-value of the heavy oil prior to treatment, or a p-value that is at least 1.5.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A process for treating a heavy oil, comprising:
 (a) heating a feedstock comprising a heavy oil to remove from said heavy oil a first fraction, wherein said first fraction contains no more than 25% of the total number of acid groups of the heavy oil, and thereby providing a second fraction, wherein said second fraction contains at least 75% of the total number of acid groups of the heavy oil; and   (b) treating said second fraction under conditions that provide a treated heavy oil that has a total acid number (TAN) that does not exceed 1.0 mg KOH/g, or is at least 50% lower than the total acid number (TAN) of said heavy oil prior to step (a), an olefin content that does not exceed 1.0 wt. %, and a p-value which is at least 50% of the p-value of said heavy oil prior to step (a), or a p-value of at least 1.5.   
     
     
         2 . The process of  claim 1  wherein step (a) comprises heating said feedstock comprising a heavy oil to a temperature that does not exceed 350° C. atmospheric equivalent temperature and subjecting said feedstock comprising a heavy oil a pressure that does not exceed 3 atm. 
     
     
         3 . The process of  claim 1  wherein step (b) comprises heating said second fraction to a temperature that does not exceed 400° C. atmospheric equivalent temperature and subjecting said second fraction to a pressure that does not exceed 1 atm. 
     
     
         4 . The process of  claim 3  wherein step (b) comprises heating said second fraction to a temperature that does not exceed 385° C. atmospheric equivalent temperature and subjecting said second fraction to a pressure that does not exceed 1 atm. 
     
     
         5 . The process of  claim 4  where step (b) comprises heating said second fraction to a temperature that does not exceed 380° C. atmospheric equivalent temperature and subjecting said second fraction to a pressure that does not exceed 1 atm. 
     
     
         6 . The process of  claim 1  wherein, prior to step (a), said feedstock comprising a heavy oil is heated to a temperature that does not exceed 100° C. atmospheric equivalent temperature, thereby removing components having a boiling point of 100° C. atmospheric equivalent temperature or less from said heavy oil. 
     
     
         7 . The process of  claim 1  wherein, in step (a), said feedstock comprising a heavy oil is subjected to a pressure that does not exceed 500 mmHg. 
     
     
         8 . The process of  claim 3  wherein, in step (b), said second fraction is subjected to a pressure of about 500 mmHg. 
     
     
         9 . The process of  claim 3  wherein, in step (b), said second fraction is heated to a temperature of from about 350° C. atmospheric equivalent temperature to a temperature that does not exceed 400° C. atmospheric equivalent temperature. 
     
     
         10 . The process of  claim 3  wherein, in step (b), said second fraction is heated to a temperature that does not exceed 400° C. atmospheric equivalent temperature and subjected to a pressure that does not exceed 1 atm for a period of time of from about 1 minute to about 60 minutes. 
     
     
         11 . The process of  claim 10  wherein, in step (b), said second fraction is heated to a temperature that does not exceed 400° C. atmospheric equivalent temperature and subjected to a pressure that does not exceed 1 atm for a period of time of from about 20 minutes to about 35 minutes. 
     
     
         12 . The process of  claim 1  wherein said treated heavy oil has a p-value that is at least 75% of the p-value of the heavy oil prior to step (a), or has a p-value of at least 2.0. 
     
     
         13 . The process of  claim 1  wherein said first fraction contains no more than 10% of the total number of acid groups of the heavy oil, and said second fraction contains at least 90% of the total number of acid groups of the heavy oil. 
     
     
         14 . The process of  claim 13  wherein said first fraction contains no more than 5% of the total number of acid groups of the heavy oil, and said second fraction contains at least 95% of the total number of acid groups of the heavy oil. 
     
     
         15 . The process of  claim 14  wherein said first fraction contains no more than 3% of the total number of acid groups of the heavy oil, and said second fraction contains at least 97% of the total number of acid groups of the heavy oil. 
     
     
         16 . The process of  claim 1  wherein said treated heavy oil has an API gravity which is no more than 0.5° greater than that of said heavy oil prior to step (a). 
     
     
         17 . The process of  claim 16  wherein said treated heavy oil has an API gravity which is no more than 0.2° greater than that of said heavy oil prior to step (a). 
     
     
         18 . The process of  claim 17  wherein said treated heavy oil has an API gravity which is no more than 0.1° greater than that of said heavy oil prior to step (a). 
     
     
         19 . The process of  claim 1  wherein step (b) is performed in the absence of a stripping gas. 
     
     
         20 . The process of  claim 1 , and further comprising:
 recombining at least a portion of said first fraction with said treated heavy oil of step (b).   
     
     
         21 . The process of  claim 1 , and further comprising:
 subjecting said treated heavy oil to cavitation.   
     
     
         22 . The process of  claim 21  wherein said cavitation is hydrodynamic cavitation. 
     
     
         23 . The process of  claim 1 , and further comprising:
 subjecting said treated heavy oil to visbreaking.   
     
     
         24 . The process of  claim 1 , and further comprising:
 subjecting said treated heavy oil to a hydrogen addition process.

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