vis breaking

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Fundamentals of Refining University Of Petroleum & Energy Studies, Dehradun A Presentation On VISBREAKINGBy: Akanksha Kamboj (6) Anirban Bhandhra (15) Mohit Arora (25) MBA (OIL & GAS) Submitted To: Prof S.K. Pokhriyal

Transcript of vis breaking

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Fundamentals of Refining

University Of Petroleum & Energy Studies, Dehradun

A

Presentation

On

‘VISBREAKING’

By:Akanksha Kamboj (6)Anirban Bhandhra (15)Mohit Arora (25)

MBA (OIL & GAS)

Submitted To:Prof S.K. Pokhriyal

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•Cracking (thermal and catalytic)• Reforming• Alkylation• Polymerization• Isomerization• Coking• Visbreaking

SEPARATION CONVERSION TREATING

ASSOCIATED OPERATIONS

Include processes used to break down large longer chain molecules into smaller ones by heating

CONVERSION PROCESSES

PROCESSES IN THE PETROLEUM REFINING

Source::Program for north american Mobility A&M University texas

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Stabilizer

At m

osp

her i

cD

isti

llat i

on

VacuumDistillation

SweeteningUnit

Visbreaker

Hydrotreating

CatalyticCracking

Solvent Extraction andDewaxing

LPH and Gas

Gasoline

Naphta

Middle Distillates

Gas Oil

Lube-BaseStocks

Sweet Gasoline

Middle Distillates

Gas

Gasoline

Light Gas Oil

Lube Oil

Waxes

Gasoline, Naphtha and Middle distillates

Fuel Oil

Asphalt

Treati

ng a

nd B

lendin

g

Refinery fuel gas

Refinery fuel oil

Industrial fuels

Asphalts

Greases

Lube oils

Aviation fuels

Diesels

Heating oils

LPG

Gasoline

Solvents

Washed Crude

REFINERY FLOW DIAGRAM

Source::Program for north american Mobility A&M University texas

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04/08/2023

PROCESS OBJECTIVES Reduce the viscosity of the feed stream: Typically this is the residue

from either the refinery's atmospheric or vacuum distillation of crude Oil.

Reduce the amount of end product residual fuel oil produced by a refinery: Residual fuel oil is generally regarded as a low value product.

Increase the proportion of middle distillates in the refinery

output: Middle distillate is used as a diluent with residual oils to bring their viscosity down to a marketable level. By reducing the viscosity of the residual stream in a visbreaker, a fuel oil can be made using less diluent and the middle distillate saved can be diverted to higher value diesel or heating oil manufacture.

Source: John De Elliot (foster & Wheeler -Cost effective residue upgrading:delayed coking, visbreaking &solvent deasphalting

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• VISBREAKING Visbreaking – an abbreviation for viscosity breaking or viscosity lowering – is a liquid phase thermal conversion process to reduce the viscosity of Atmospheric (long reduce) and Vacuum (short residue) to produce specification fuel oil. Small quantities of LPG and a fair amount of naphtha are also produced.

Visbreaking is a mild thermal cracking process and help in reducing the viscosities and pour point of long and short residues. Refinery production of heavy oils can be reduced by 30% using visbreaking. Visbreaking also produces gas, gas oil stock and gasoline which go for further processing.

Petroleum Ref./Upes//GCT/July-05/Mod-6/07

Visbreaking Unit at Mathura Refinery

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04/08/2023

PROCESS VARIABLES

Furnace Outlet Temperature: At constant feed rate , the extent of cracking increases with increase in

the temperature.

Furnace Outlet Pressure: High pressure suppresses vaporization and tends to produce liquid phase

i.e. yield of gas oil is more. At low pressure there is higher yield of gas and naptha.

Feed Rate: Severity of the operation decreases with increase in the feed rate for

same furnace outlet temperature.Source- Petroleum Refining Technology- Dr.

Ram Prasad

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Source:Thermal Processes At panipat Refinery:IOCL

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Coil Visbreaker

ReducedCrude Charge

Tar

Gas Oil

Gasoline

Steam

Gas

Heater

Petroleum Ref./Upes//GCT/July-05/Mod-6/09

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04/08/2023 Source- Petroleum Refining Technology- Dr. Ram Prasad

OPERATING CONDITIONSFURNACE

Inlet temp. ‘C 340

Outlet temp.’ C 470-490

Inlet pressure Kg/cm2 22

Outlet pressure Kg/ cm2 15

Residence time ‘C 600

Quench temp ‘ C 260

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04/08/2023 Source- Petroleum Refining Technology- Dr. Ram Prasad

YIELD PATTERNFURNACE Yield - wt% on feed

Gas & loss 3

Naptha 4

Fuel Oil ( Visbroken Residue) 93

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BENEFITS & DRAWBACKS

High Sulphur fuel Oil Reduction

Low Cost Upgrading (Product Upgradation)

More useful products are available(Low & Middle distillates)

High Maintenance Cost

Decoking Required

Source: John De Elliot (foster & Wheeler -Cost effective residue upgrading:delayed coking, visbreaking &solvent deasphalting

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SO IN & ALLVisbreaking is an

Effective and cost–effective way to produce more valuable products from heavy residues.

It used to reduce the viscosity or pour point of a fuel oil Cracker feed and to reduce fuel oil production.