
Inverse problem of a small refinery


########################################

## COMPONENTS

Crude1
Crude2

LightNaphta
MediumNaphta
HeavyNaphta

ReformedGasoline
CrackedGasoline
CrackedOil

LubeOil
LightOil
HeavyOil
Residuum
JetFuel
FuelOil

PremiumMotorFuel
RegularMotorFuel

LightNaphtaForReformedGasoline
MediumNaphtaForReformedGasoline
HeavyNaphtaForReformedGasoline

LightOilForCrackedOilAndGasoline
HeavyOilForCrackedOilAndGasoline

LightNaphtaForPremiumMotorFuel
LightNaphtaForRegularMotorFuel

MediumNaphtaForPremiumMotorFuel
MediumNaphtaForRegularMotorFuel

HeavyNaphtaForPremiumMotorFuel
HeavyNaphtaForRegularMotorFuel

ReformedGasolineForPremiumMotorFuel
ReformedGasolineForRegularMotorFuel

CrackedGasolineForPremiumMotorFuel
CrackedGasolineForRegularMotorFuel

LightOilForJetFuel
heavyOilForJetFuel
ResiduumForjetFuel
CrackedOilForJetFuel

ResiduumForLubeOil

## END COMPONENTS



## EQUALITIES

! Distillation
Dist1:   0.10*Crude1 + 0.15*Crude2 = LightNaphta
Dist2:   0.20*Crude1 + 0.25*Crude2 = MediumNaphta
Dist3:   0.20*Crude1 + 0.18*Crude2 = HeavyNaphta
Dist4:   0.12*Crude1 + 0.08*Crude2 = LightOil
Dist5:   0.20*Crude1 + 0.19*Crude2 = HeavyOil
Dist6:   0.13*Crude1 + 0.12*Crude2 = Residuum

! reformed gasoline produced
Prod1:  ReformedGasoline =  0.6 *LightNaphtaForReformedGasoline  &
                          + 0.52*MediumNaphtaForReformedGasoline &
                          + 0.45*HeavyNaphtaForReformedGasoline
! Cracked oil and gasoline
Prod2:  CrackedGasoline  =  0.28* LightOilForCrackedOilAndGasoline &
                          + 0.20* HeavyOilForCrackedOilAndGasoline

Prod3:  CrackedOil       =  0.68* LightOilForCrackedOilAndGasoline &
                          + 0.75* HeavyOilForCrackedOilAndGasoline
 
! lube-oil and residuum from which produced
Prod4:  LubeOil          = 0.5 * ResiduumForLubeOil

! types of oil used
Oil1:   LightNaphta =  LightNaphtaForReformedGasoline  &
                    + LightNaphtaForPremiumMotorFuel  &
                    + LightNaphtaForRegularMotorFuel

Oil2:    MediumNaphta =  MediumNaphtaForReformedGasoline  &
                       + MediumNaphtaForPremiumMotorFuel  &
                       + MediumNaphtaForRegularMotorFuel

Oil3:    HeavyNaphta =  HeavyNaphtaForReformedGasoline  &
                      + HeavyNaphtaForPremiumMotorFuel  &
                      + HeavyNaphtaForRegularMotorFuel

Oil4:    LightOil    =  LightOilForJetFuel               &
                      + LightOilForCrackedOilAndGasoline &
                      + 0.55*FuelOil

Oil5:    HeavyOil    = HeavyOilForJetFuel                &
                     + heavyOilForCrackedOilAndGasoline  &
                     + 0.16*FuelOil

Oil6:    CrackedOil  = CrackedOilForJetFuel              &
                     + 0.22*FuelOil

Oil7:    Residuum    = ResiduumForjetFuel                &
                     +ResiduumForLubeOil                 &
                     + 0.05*FuelOil

Oil8:    CrackedGasoline = CrackedGasolineForPremiumMotorFuel  &
                         +CrackedGasolineForRegularMotorFuel

Oil8:    ReformedGasoline = ReformedGasolineForPremiumMotorFuel  &
                          +ReformedGasolineForRegularMotorFuel

! Quantity of premium motor fuel produced
Fuel1:   RegularMotorFuel = LightNaphtaForRegularMotorFuel  &
                           +MediumNaphtaForRegularMotorFuel &
		 	               +HeavyNaphtaForRegularMotorFuel  &
		 		           +ReformedGasolineForRegularMotorFuel &
		 		           +CrackedGasolineForRegularMotorFuel

Fuel2:    PremiumMotorFuel = LightNaphtaForPremiumMotorFuel      &
                            +MediumNaphtaForPremiumMotorFuel     &
				            +HeavyNaphtaForPremiumMotorFuel      &
				            +ReformedGasolineForPremiumMotorFuel &
				            +CrackedGasolineForPremiumMotorFuel

Fuel3:    JetFuel          = LightOilForJetFuel              &
                            +heavyOilForJetFuel              &
                            +ResiduumForjetFuel              &
                            +CrackedOilForJetFuel             

## END EQUALITIES



## CONSTRAINTS

Stock1:   Crude1 < 20000
Stock2:   Crude2 < 30000

! Capacity constraints
Capacity1:  Crude1 + Crude2 < DistillationCapacity

Capacity2:   LightNaphtaForReformedGasoline  +          &
             MediumNaphtaForReformedGasoline +          &
             HeavyNaphtaForReformedGasoline  < ReformingCapacity

Capacity3:   LightOilForCrackedOilAndGasoline  +        &
             HeavyOilForCrackedOilAndGasoline < CrackingCapacity

Capacity4:   LubeOil = [500,1000]

Capacity5:   PremiumMotorFuel > 0.4*RegularMotorFuel

! Quality: the octane number
Quality1:    94*PremiumMotorFuel < 90*LightNaphtaForPremiumMotorFuel        &
                                  +80*MediumNaphtaForPremiumMotorFuel       &
            					  +70*HeavyNaphtaForPremiumMotorFuel        &
			                 	  +115*ReformedGasolineForPremiumMotorFuel  &
					              +105*CrackedGasolineForPremiumMotorFuel

Quality2:     84*RegularMotorFuel < 90*LightNaphtaForRegularMotorFuel        &
                                  +80*MediumNaphtaForRegularMotorFuel       &
					              +70*HeavyNaphtaForRegularMotorFuel        &
             					  +115*ReformedGasolineForRegularMotorFuel  &
			              		  +105*CrackedGasolineForRegularMotorFuel

! Vapor pressure
Vapor:     JetFuel > LightOilForJetFuel                  &
                    +0.6*heavyOilForJetFuel              &
                    +0.05*ResiduumForjetFuel             &
                    +1.5*CrackedOilForJetFuel      

## END CONSTRAINTS

## PROFIT

 7.0*PremiumMotorFuel + 6.0*RegularMotorFuel       &
 + 4.0*JetFuel        + 3.50*FuelOil              &
 + 1.50*LubeOil

## END PROFIT

## Parameter

DistillationCapacity = 45000
ReformingCapacity    = 10000
CrackingCapacity     = 8000

## END Parameter
