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US 11,752,452 B2Granted
Purification of oil
AssigneeRecondoil Sweden AB
InventorsFred Sundström, Thomas Persson
Life of this patent
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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.
Claims21
A system (1;
- 101) for purification of oil, said system comprising:
- at least one feed tank (3) arranged to contain oil to be purified;
- a separation aid dosing device (13) comprising a liquid separation aid forming part of said system therein, said separation aid being liquid at temperature at which said purification 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, having a different density from the oil to be purified, and forming a two-phase mixture upon mixing with the oil to be purified and thus colloids consisting of droplets of the liquid separation aid are formed which through hydrophilic, hydrophobic, and charge interactions absorb the contaminating solids or the dissolved impurities from the oil to be purified;
- 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 solid, integral 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 of cellulose fiber powder configured and positioned after said sedimentation tank (21;
- 121a, 121b, 121c) to absorb possibly-remaining separation aid, water, contaminating solids and dissolved impurities from the oil phase removed from the sedimentation tank,
- wherein said depth filter is a filter cake of said cellulose fiber powder.
13 more elements
Dependencies are inferred from the claim text.