Bitumen production-upgrade with common or different solvents
View Patent ↗Disclosed is a process for the upgrading of heavy oils and bitumens, where the total feed to the process can include heavy oil or bitumen, water, and diluent. The process can include the steps of solvent deasphalting 110 the total feed 105 to recover an asphaltene fraction 116 , a deasphalted oil fraction 118 essentially free of asphaltenes, a water fraction 112 , and a solvent fraction 114 . The process allows removal of salts from the heavy oils and bitumens either into the aqueous products or with the asphaltene product.
1. An integrated process for transporting and upgrading heavy oil or bitumen, comprising:
diluting the heavy oil or bitumen at a production site with a diluent comprising a hydrocarbon having from 3 to 8 carbon atoms to form a mixture;
transporting the mixture from the production site to a solvent deasphalting unit;
deasphalting the mixture in the solvent deasphalting unit to recover an asphaltene fraction, a deasphalted oil fraction essentially free of asphaltenes, and a solvent fraction;
separating water and salts from the asphaltene fraction, the deasphalted oil fraction, and the solvent fraction at the solvent deasphalting unit; and
conveying at least a portion of the solvent fraction to the production site to dilute the heavy oil or bitumen and form the mixture.
2. The process of claim 1 wherein the heavy oil or bitumen has an API gravity from 2 to 15.
3. The process of claim 1 wherein the heavy oil or bitumen has a total acid number between 0.5 and 6.
4. The process of claim 1 wherein the heavy oil or bitumen has a basic sediment and water content from 0.1 to 6 weight percent.
5. The process of claim 1 further comprising injecting water into the mixture at or upstream from the solvent deasphalting unit to facilitate removal of chloride salts.
6. The process of claim 1 wherein the solvent deasphalting of the mixture occurs at a temperature not exceeding 232° C.
7. The process of claim 1 wherein the dilution of the heavy oil or bitumen comprise a ratio of from 1 to 10 parts by weight diluent per part by weight heavy oil or bitumen.
8. The process of claim 1 wherein the solvent deasphalting is at a ratio of from 1 to 10 parts by weight solvent per part by weight heavy oil or bitumen.
9. The process of claim 1 wherein the solvent comprises a hydrocarbon having 3 to 8 carbon atoms or a combination thereof.
10. The process of claim 1 wherein the solvent comprises a hydrocarbon having 4 to 7 carbon atoms or a combination thereof.
11. The process of claim 1 wherein the solvent comprises a hydrocarbon having 5 or 6 carbon atoms or a combination thereof.
12. The process of claim 1 wherein the heavy oil or bitumen is free of desalting upstream from the solvent deasphalting unit.
13. An integrated process for transporting and upgrading heavy oil or bitumen, comprising:
diluting the heavy oil or bitumen with a diluent comprising a hydrocarbon having from 3 to 8 carbon atoms to form a mixture;
transporting the mixture to a solvent deasphalting unit;
deasphalting the mixture in the solvent deasphalting unit to recover an asphaltene fraction, a deasphalted oil fraction essentially free of asphaltenes, and a solvent fraction;
separating water and salts from the asphaltene fraction, the deasphalted oil fraction, and the solvent fraction at the solvent deasphalting unit, wherein sour water and chloride salts are recovered from the deasphalted oil fraction rendering the deasphalted oil fraction essentially free of water and chloride salts; and
recycling at least a portion of the solvent fraction to the heavy oil or bitumen as the diluent to form the mixture.
14. The integrated process of claim 13 , further comprising injecting seed water into the mixture prior to the solvent deasphalting unit to facilitate salt removal.
15. The integrated process of claim 13 , further comprising diluting the heavy oil or bitumen with the diluent at a production site for the heavy oil or bitumen.