Back to results
US 11,458,420 B2Granted
Purification of oil
AssigneeRecondoil Sweden AB
InventorsFred Sundström, Thomas Persson
Life of this patent
Estimating the term…
Abstract
A method and a system for purification of oil, said method comprising the steps of: —providing separation aid and oil to be purified to at least one sedimentation tank; —waiting for allowing a sludge phase to sediment to a bottom part of the sedimentation tank, said sludge phase comprising the separation aid together with impurities from the oil; —removing an oil phase not comprising said sludge phase from the at least one sedimentation tank; and —filtering said oil phase through a depth filter for removing any possible remaining separation aid and impurities.
Claims26
A method for purification of oil, said method comprising the steps of:
- providing a separation aid from a separation aid dosing device (13) and oil to be purified from at least one feed tank (3) to at least one sedimentation tank (21;
- 121a, 121b, 121c),
- the separation aid being liquid at temperature at which said method is carried out and will by chemical interaction absorb contaminating solids or dissolved impurities in the oil to be purified, being substantially insoluble in the oil to be purified due to polar properties, and having a different density from the oil to be purified;
- mixing said separation aid and said oil to be purified, to form a two-phase mixture;
- absorbing contaminating solids or dissolved impurities from the oil to be purified, by chemical interaction with said separation aid;
- waiting to allow a sludge phase to sediment to a bottom part (37) of the sedimentation tank (21;
- 121a, 121b, 121c), said sludge phase comprising the separation aid together with impurities from the oil;
- removing an oil phase not comprising said sludge phase from the at least one sedimentation tank through at least one oil phase outlet (39a, 39b;
- 139a, 139b 139c) of the sedimentation tank;
- and
- filtering through a depth filter of cellulose fiber powder, said oil phase for removing any possible remaining separation aid and impurities.
8 more elements
A method for purification of oil, said method comprising the steps of:
- providing separation aid and oil to be purified to at least one sedimentation tank (21;
- 121a, 121b, 121c);
- waiting for allowing a sludge phase to sediment to a bottom part (37) of the sedimentation tank (21;
- 121a, 121b, 121c), said sludge phase comprising the separation aid together with impurities from the oil;
- removing an oil phase not comprising said sludge phase from the at least one sedimentation tank;
- and
- filtering through a depth filter said oil phase for removing any possible remaining separation aid and impurities, wherein
- at least a part of the sludge phase settled in the bottom part (37) of the sedimentation tank (21;
- 121a, 121b, 121c) in a previous purification cycle performed in the sedimentation tank is reused in a next purification cycle where oil to be purified is provided into the sedimentation tank, whereby the sludge phase is mixed into the newly provided oil by a mixing device (33) provided in the sedimentation tank.
6 more elements
A method for purification of oil, said method comprising the steps of:
- providing separation aid and oil to be purified to at least one sedimentation tank (21;
- 121a, 121b, 121c);
- waiting for allowing a sludge phase to sediment to a bottom part (37) of the sedimentation tank (21;
- 121a, 121b, 121c), said sludge phase comprising the separation aid together with impurities from the oil;
- removing an oil phase not comprising said sludge phase from the at least one sedimentation tank;
- and
- filtering through a depth filter said oil phase for removing any possible remaining separation aid and impurities, wherein
- the method further comprises controlling removal of a sludge phase from the sedimentation tank (21;
- 121a, 121b, 121c) through at least one sludge phase outlet (41a, 41b;
- 141a, 141b, 141c) while monitoring an output from a content detection sensor (55b;
- 155a, 155b, 155c) provided at substantially the same level as an oil phase outlet (39a;
- 139a, 139b, 139c) of the sedimentation tank and stop the removal of a sludge phase when the output from the content detection sensor indicates that an oil phase instead of a previous sludge phase is provided at the level of the oil phase outlet.
9 more elements
A system (1;
- 101) for purification of oil, said system comprising:
- at least one feed tank (3) comprising oil to be purified;
- a separation aid dosing device (13);
- at least one sedimentation tank (21;
- 121a, 121b, 121c) comprising at least one inlet (23;
- 123a, 123b, 123c) connected to the at least one feed tank (3) for receiving oil to be purified and to the separation aid dosing device (13) for receiving the separation aid,
- said sedimentation tank (21;
- 121a, 121b, 121c) further comprising at least one oil phase outlet (39a, 39b;
- 139a, 139b, 139c) for removing an oil phase from the sedimentation tank after sedimentation of a sludge phase to a bottom part (37) of the sedimentation tank,
- said sludge phase comprising the separation aid together with impurities from the oil;
- and
- a filter module (51) connected to the at least one oil phase outlet (39a, 39b;
- 139a, 139b, 139c) of the at least one sedimentation tank (21;
- 121a, 121b, 121c), wherein said filter module (51) comprises a depth filter, wherein
- a control system (31;
- 131) provided in the system (1;
- 101) is configured for controlling removal of a sludge phase from the sedimentation tank (21;
- 121a, 121b, 121c) through the at least one sludge phase outlet (41a, 41b;
- 141a, 141b, 141c) while monitoring an output from a content detection sensor (55b;
- 155a, 155b, 155c) provided at substantially the same level as the oil phase outlet (39a;
- 139a, 139b, 139c) of the sedimentation tank and stop the removal of a sludge phase when the output from the content detection sensor (55b;
- 155a, 155b, 155c) indicates that an oil phase instead of a previous sludge phase is provided at the level of the oil phase outlet (39a;
- 139a, 139b, 139c).
20 more elements
Dependencies are inferred from the claim text.