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NMP Technology on Lube Extraction R&D Effort Towards Commercialization of Indigenous Technology Developed Jointly By Indian Institute of Petroleum Chennai Petroleum Corporation Limited Engineers India Limited. Introduction. NMP technology aims to remove poly aromatics and other

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Presentation Transcript
slide1

NMP Technology on Lube Extraction

R&D Effort

Towards

Commercialization of Indigenous Technology

Developed Jointly

By

Indian Institute of Petroleum

Chennai Petroleum Corporation Limited

Engineers India Limited

slide2

Introduction

NMP technology aims to remove poly aromatics and other

undesirable components from Lube Stock like LN,HN,BN,BS

by using suitable solvent .

Benefits from NMP Technology :

  • Improvement in viscosity index
  • Reduction of contaminants like sulfur and nitrogen compounds
  • Improvement in product color
  • Improvement in inhibitor response
slide3
High Selectivity

Good Solvency

Easy Recovery from hydrocarbon phase

Good chemical and thermal stability

Low vapor pressure to minimize energy

Non Corrosive and non toxic

Bio-degradability

Low Cost

Solvent Selection

slide4
Liquid SO2 -developed by Edeleanu(1907)

Phenol - Licensed by Kellogg and Exxon (1930)

( No. of Plant in India : 1)

Furfural - developed by Shell(1934) & Texaco

( No. of Plants in India : 1)

N Methyl Pyrrolidone (NMP) -developed by Texaco(1965) & Exxon

( No. of Plants in India : 3)

Solvent for Lube Extraction

OH

CH2

C=O

CH2

N

CH2

CH3

CH

CH

CH

C-CHO

O

slide5

Comparison of NMP, Furfural & Phenol

OH

CH2

C=O

CH2

N

CH2

CH3

CH

CH

CH

C-CHO

O

slide9

Comparison of NMP & Furfural

Typical Utilities : Furfural Vs NMP

slide10

Comparison of NMP & Furfural

Benefits of NMP

Feed Stock : IN

slide12
Steps in Process Design

Feed Characterization

Design of Extraction Section

Design of Solvent Recovery Section for Raffinate Stream

Design of Solvent Recovery Section for Extract Stream

slide14

Components in Lube Stocks

Hydrocarbons

Hetero Compounds

Saturates

Aromatics

Paraffins

Mono

O

Alkyl Naphthenes

Di

Poly

S

N

Branched Paraffins

slide15
Objective : Generation of pseudo components

Requires comprehensive experimental data

Physical and Chemical characteristics

Density, Pour Point, RI, Viscosity ,Total S,N,Wax Content, CCR, M.wt, Aniline point , ASTM Distillation(D1160),Carbon Distribution, %CA, %CN, %CP, RA,RN,%N+P,%A+S

Phase Equilibria for LLE

Continuous column studies

IIP carried out Laboratory Study

LLE study by in-house Simulator

Prediction of phase equilibrium by UNIFAC

Inputs for Feed Characterization

slide16

TypicalCompositions of Feed

  • Carbon no. changes from C15 to C50
slide17
EIL developed in-house simulator for generation of

total heat & material balance for lube extraction unit

Input for Simulator :

Physical Properties of feed

Liquid -Liquid Equilibria

Water content in solvent

Product specifications like VI of raffinate, desired raffinate yield etc to meet client’s requirement

Flowsheet Simulation

slide19
Solvent to Feed Ratio

Temperature / Temperature Gradient of Extractor

Water Content in Solvent

Oil in Recycled Solvent

Type of Extractor in Commercial Use

Sieve Tray Extractor

Packed Column

RDC

Design Parameters

slide21
Equipments

Raffinate Recovery Section

Raffinate Vacuum flash column

Raffinate stripper

Heat Exchangers

Solvent Recovery Section

slide22
Equipments

Extract Recovery Section

LP,MP,HP Flash Columns

Extract Vac. Flash Column

Extract Stripper

Heat Exchangers

Solvent Recovery Section

slide23
NMP content in final raffinate - to be minimized

Hydro carbon contents in extract – to be minimized

Water content in solvent – to be appropriate for higher raffinate yield

No. of flash columns in solvent recovery section for extract streams – to be optimized

Optimization of heat exchanger network for energy saving

Design Guidelines

slide24
Objective : To minimize solvent content in extract & raffinate R/D

LP steam used as stripping medium

Inert gas stripping

Nitrogen may be used as inter gas

Provides better operation

Needs less energy

Stripping Section

slide25
Solvent Drying Column to maintain desired water content in NMP

Process variables :

Water content in solvent

Pressure of drying column

Solvent loss through overhead

Solvent Recirculation Section

slide26
Case Study

( NMP Extraction Unit- IOCL, Haldia)

Licensed by EIL,IIP & CPCL

slide27
Design Capacity

DAO : 125,000 TPA

HN : 100,000 TPA

IN :125,000TPA

Turndown ratio : 50%

Number of Trains : 1

Solvent : NMP

Feed Characterization : By IIP

Feed Temperature : 80 C

Design Basis

slide28
Water injection at Extractor Bottom

S/F ratio

IN : 1.93 w/w

HN :2.25 w/w

BS :2.0 w/w

Product Specifications :

Raffinate Yield , VI & Pour Point

IN : 52.4 wt%, 98, - 9.0 C

HN :40.4 wt%, 96, - 9.0 C

BS :56.1 wt%,95, - 6.0 C

Design Basis – Continue ….

slide33
Plant was commissioned without any problem in 1999 and operation was found perfect .

Plant is in continuous operation without any major problem since commissioning.

As information available from IOCL , solvent loss may be one issue which needs to be taken care properly.

Further work may be required for better operation of solvent recovery section and inter gas stripping may be considered as an alternative.

Plant Performance & Future Work

eil s offer for nmp based extraction unit

Includes

  • Development of Basic Design & Engineering Packages for Extraction Unit
  • Detailed Engineering
  • Plant Commissioning
  • ( *with IIP and CPCL )

EIL’S (*) Offer for NMP Based Extraction Unit

slide35

Winner of

CSIR National Award –2000

slide36

ACKNOWLEDGEMENTS

We Express our Sincere Thanks to

Indian Institute of Petroleum

& Chennai Petroleum Corporation Limited

for Technical Support in Development and Commercialisation of NMP Technology