US 11,247,147 B2 · Purification of oil

Abstract

A system (1; 101) and a method 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 basic sedimentation tank (21a, 21b) comprising at least one inlet (23a, 23b) connected to the feed tank (3) and to the separation aid dosing device (13) for receiving oil to be purified and separation aid, said at least one basic sedimentation tank (21a, 21b) further comprising at least one sludge phase outlet (41a, 41b) provided in a bottom part (37a, 37b) of the basic sedimentation tank and at least one oil phase outlet (39a, 39b);—at least one advanced sedimentation tank (121) comprising at least one sludge phase inlet (122) connected to the at least one sludge phase outlet (41a, 41b) of the at least one basic sedimentation tank (21a, 21b), said advanced sedimentation tank (121) further comprising at least one sludge phase outlet (141; 141a, 141b) connected to a sludge tank (143) and at least one oil phase outlet (139a, 139b; 39), wherein said advanced sedimentation tank (121) further comprises at least one sensor (55; 55a, 55b, 55c) for detecting the presence of an oil phase or a sludge phase.

Claims19

Dependent claims

A system for purification of oil, said system comprising:

a feed tank comprising oil to be purified;
a separation aid dosing device;
a first basic sedimentation tank comprising at least one inlet connected to the feed tank and to the separation aid dosing device for receiving oil to be purified and a separation aid, said basic sedimentation tank further comprising a sludge phase outlet by provided in a bottom part of the basic sedimentation tank and an oil phase outlet;
and
an advanced sedimentation tank comprising a sludge phase inlet connected to the sludge phase outlet of the basic sedimentation tank,
said advanced sedimentation tank further comprising a sludge phase outlet connected to a sludge tank and an oil phase outlet,
wherein said advanced sedimentation tank further comprises a first sensor for detecting presence of an oil phase or a sludge phase, and
a control system configured for controlling removal of an oil phase from the advanced sedimentation tank depending on an output from the sensor in the advanced sedimentation tank, with sedimentation of the sludge phase in a bottom part of the advanced sedimentation tank resulting in detection of the oil phase at a certain level within said advanced sedimentation tank by said sensor, said sludge phase comprising the separation aid together with impurities from the oil.

5 more elements

A method for purification of oil in a system comprising a first basic sedimentation tank and an advanced sedimentation tank, said method comprising:

providing a separation aid and oil to be purified to the basic sedimentation tank;
for allowing a sludge phase to sediment in a bottom part of the basic sedimentation tank, said sludge phase comprising the separation aid and impurities from the oil;
removing the oil phase from the basic sedimentation tank;
transferring the sludge phase from the basic sedimentation tank to the advanced sedimentation tank;
allowing a sludge phase to sediment in a bottom part of the advanced sedimentation tank, said sludge phase comprising the separation aid and impurities from the oil;
detecting by a sensor provided in the advanced sedimentation tank, the presence of an oil phase or a sludge phase in a position in the advanced sedimentation tank;
and
removing the oil phase from the advanced sedimentation tank depending on the detection of the oil phase at a certain level within said advanced sedimentation tank by the sensor.

5 more elements

Dependencies are inferred from the claim text.

Purification of oil

Life of this patent

Purification of oil

Life of this patent

Abstract

Claims19