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Synopsis

Waste Lube Oil Re-refining Using Vacuum Distillation 

Introduction

In Pakistan no effort has been made on large scale for re-refining of waste lube oil (waste automobile-

lubricating oil). Although on small scale many industries utilize the different treatment technologies

(such as treatment with adsorbents, acid clay treatment etc.) to produce low grade lubricating oils. It is

evident from research that vacuum distillation of waste lube oil has proved to be an efficient

technology for maximizing yields of good grade oils. As in Pakistan no attempt has been developed

for the collection of waste lube oil on large scale so vacuum distillation of only waste lube oil is

impractical.

The newly developed technology for treating waste automobile-lubricating oil is based on vacuum

distillation of them mixed with crude atmospheric distillation residues. More than 95% of hazardous

heavy metals, ash and carbon residue contents in the waste lube oils are eliminated from vacuum

residues and these residues were successfully converted into asphalt for the pavement of a road. The

increased yield and improved quality of distilled products are experimentally identified in the range of 

0 20% blending ratio of waste lube oils to atmospheric residues.

Design Basis

1)  Assay for Atmospheric residue and Waste lube oil

i)  Atmospheric Residue

AssayPercent Temperature [C]

0 274.8

2 285.8

5 300.8

10 319.6

20 335.1

30 350.7

40 366.2

50 391.2

60 397.770 415.8

80 433.8

90 451.9

95 460.9

98 466.3

100 469.9

BULK PROPERTIES:

Not Given

Assay Data Type (ASTM Method) D1160

Distillation Conditions VacuumPressure -14.68 psig

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ii)  SN-65

Assay

Percent

Temperature [C]

0 118.6

5 142.810 146.9

20 152.2

30 156.7

40 161.9

50 165.4

60 171.1

70 175.7

80 181.2

90 189

95 192.3

BULK PROPERTIES:

1. Mol. Wt. 340

2. Standard Density 53.02 lb/ft3

3. Kinematic Viscosity @ 40oC 8.25 cSt

4. Kinematic Viscosity @ 100oC 2.35 cSt

Assay Data Type (ASTM Method) D1160

Distillation Conditions Vacuum

Pressure -14.68 psig

iii)  SN-100

Assay

Percent Temperature [C]

0 147.8

5 161.9

10 178.4

20 188.4

30 196.2

40 202.6

50 208.3

60 214

70 221

80 229.1

90 238.1

95 245.7

BULK PROPERTIES:

1. Mol. Wt. 360

2. Standard Density 54.47 lb/ft3

3. Kinematic Viscosity @ 40

o

C 20.61 cSt4. Kinematic Viscosity @ 100

oC 4.13 cSt

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iv)  SN-150

Assay

Percent Temperature [C]

0 164.5

5 188

10 205.9

20 217.5

30 221.5

40 225.5

50 228.3

60 232.3

70 236

80 242.1

90 252.9

95 261.5

BULK PROPERTIES:

1. Mol. Wt. 420

2. Standard Density 54.76 lb/ft3

3. Kinematic Viscosity @ 40oC 34.42 cSt

4. Kinematic Viscosity @ 100oC 5.45 cSt

Assay Data Type (ASTM Method) D1160Distillation Conditions Vacuum

Pressure -14.68 psig

v)  SN-400

Assay

Percent Temperature [C]

0 195.3

5 216.5

10 231.9

20 251.9

30 261.2

40 267.1

50 273.8

60 284.1

70 293.5

80 305.2

90 323.4

95 331.1

Assay Data Type (ASTM Method) D1160

Distillation Conditions Vacuum

Pressure -14.68 psig

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BULK PROPERTIES:

1. Mol. Wt. 500

2. Standard Density 55.6 lb/ft3

3. Kinematic Viscosity @ 40oC 79.15 cSt

4. Kinematic Viscosity @ 100

o

C 9.68 cStAssay Data Type (ASTM Method) D1160

Distillation Conditions Vacuum

Pressure -14.68 psig

2)  Reference Flow Diagram