Solvent extraction process to stabilize, desulphurize and dry wide range diesels, stabilized wide range diesels obtained and their uses
AssigneeEnvirollea Inc.
InventorLucie B. Wheeler
Life of this patent
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Abstract
A process allowing the removal of contaminants from an unstable oil such as those produced by thermal or catalytic cracking, wherein, in at least one step of the process, mixing of the unstable oil with a pure or impure solvent having a dipole moment greater than 2 is performed. The stabilized diesels thereby obtained exhibit interesting properties among which significant stability features and are useful in numerous applications, some of these stabilized wide range diesels are new as well as their uses.
Claims34
A process to stabilize and to remove contaminants from unstable oil, the process comprising the following steps of:
- a) intimately contacting a stream of the unstable oil with an initial solvent having a dipole moment ranging from 1.37 to 3.6 and 3.81 to 4.98 debyes to obtain two mixtures, a first mixture being of an oil-solvent type, which comprises treated oil, solvent, and impurities, and a second mixture being of a solvent-oil type, which comprises treated oil, solvent, residues, and impurities;
- b) separating the treated oil, present in the first mixture obtained in step a), from the solvent, leaving most of the impurities in the solvent phase;
- c) separating the solvent and the treated oil, present in the second mixture obtained in step a), from the residues;
- and
- d) recycling, in the process, one or more solvents with impurities, recovered in steps b) or c), and partially regenerated before being recycled to said process;
- wherein in step b) at least 98% of the impurities remain in the solvent phase;
- wherein in step d), at least one of each of said solvent is regenerated, for at least 50% wt. but for less or equal to 83% wt. to obtain a regenerated solvent stream, before recycling;
- optionally, wherein the treated oil recovered from the first mixture is mixed with the treated oil recovered from the second mixture.
A process to stabilize and to remove contaminants from unstable oil, the process comprising the following steps of:
- a) intimately contacting a stream of the unstable oil with an initial solvent having a dipole moment ranging from 1.37 to 1.86 and 3.9 to 4.98 debyes to obtain two mixtures, a first mixture being of an oil-solvent type, which comprises treated oil, solvent, and impurities, and a second mixture being of a solvent-oil type, which comprises treated oil, solvent, residues, and impurities;
- b) separating the treated oil, present in the first mixture obtained in step a), from the solvent, leaving most of the impurities in the solvent phase;
- c) separating the solvent and the treated oil, present in the second mixture obtained in step a), from the residues;
- and
- d) recycling, in the process, one or more solvents with impurities, recovered in steps b) or c), and partially regenerated before being recycled to said process;
- wherein in step b) at least 98% of the impurities remain in the solvent phase;
- wherein in step d), at least one of each of said solvent is regenerated, for at least 50% wt. but for less or equal to 83% wt. to obtain a regenerated solvent stream, before recycling;
- optionally, wherein the treated oil recovered from the first mixture is mixed with the treated oil recovered from the second mixture.
Dependencies are inferred from the claim text.