Lube Refining Essence of Solvent Extraction V D U P D A RCO

1
Lube Refining Essence of Solvent Extraction
2
PROCESS FLOW PLAN - LUBE REFINERY
SPO D
H2
P D U
S E U
HY. R E A C T O R
SPO
V D U
SPO R
150N D
150N R
150N\T
500N D
500N R
500N\T
RCO
1300N D
1300N
1300N R
DAO D
SBS
DAO R

IO100
IO100 D
P D A
IO-100 HD
IOH
IO-1600
IO1600 D
H2-PLANT
IO-1600 HD
LPG\NAPHTHA
FLO
RPO CBFS
H2
S W
ASPHALT.
TO-FR
3
Process Objectives
PROCESSES OBJECTIVES
VDU VI, COLOR-STABILITY, DE-NITRIFICATION, DE-SULPHURIZATION
SOLVENT EXTRACTION HYDROFINER VISCOSITY, COLOR, FLASH POINT
PROPANE DEASPHALTING UNIT(PDA) VISCOSITY, COLOR, CCR
PROPANE DEWAXING UNIT(PDU) CLOUD POINT , POUR POINT
SOLVENT EXTRACTION HYDROFINER VISCOSITY, COLOR, FLASH POINT
PROPANE DEASPHALTING UNIT(PDA) VISCOSITY, COLOR, CCR
PROPANE DEWAXING UNIT(PDU) CLOUD POINT , POUR POINT
4
Solvent Extraction
Raffinate Solution
Raffinate Recovery
NMP
Treater Tower
Solvent Stripping Gas Recovery
Feed
Extract Recovery
Extract Solution
5
Extraction concepts

• Using solvent, you extract either desirable or
  undesirable compounds from a liquid mixture.
• Counter-current liquid/liquid contacting in
  Treater Tower
• Two phase system - heavy light phase
• Improves viscosity index, color of lube oil
• Removes aromatic compounds
• Reduce viscosity

6
Properties of NMP

• Full name N-methyl-2-pyrrolidone
• Density, 25 C 1.027
• Boiling Point, C 204
• Freezing Point, C -24.1
• Viscosity, cP _at_140 C 1.02

CH2
H2C
H2C
CO
NCH3
7
Extract Recovery

• Extract solution (treater tower bottom - aromatic
  distillate) preheated to 225 C before entering
  the Extract Recovery Furnace
• Extract Recovery Tower
• 27 trays top temperature 260 - 265 C, Bot
  temperature 250 - 275 C (top bot depend on
  type of grade)
• Stripping medium LPG at 210 C
• Extract oil stripped down to 5 ppm of NMP
• Overhead product stripping gas, water vapor,
  light HC and NMP Vap
• Overhead product is combined with raffinate
  recovery tower overhead.
• They go to dry solvent drum through series of
  exchanger which generate intermediate steam and
  increase Extract Recovery Furnace
• Bottom product is stripped off of light HC and
  cooled to 80 C and then goes to tankage.

8
Raffinate Recovery

• Raffinate solution (treater tower overhead -
  paraffinic distillate) preheated to 210 C before
  entering the Raffinate Recovery Furnace.
• Raffinate Recovery
• 27 trays top temperature 225-235 C, Bot
  temperature 290 - 310 C (top bot depend on
  type of grade)
• Stripping medium LPG at 210 C
• Raffinate oil stripped down to 5 ppm of NMP
• Overhead product stripping gas ,water vapor
  ,light HC and NMP Vap
• Overhead product is combined with extract
  recovery tower overhead.
• They go to dry solvent drum through series of
  exchanger which generate intermediate steam and
  increase Extract Recovery Furnace
• Bottom product goes to Hydrofiner reactor