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AspenWorld 2000
SYNTHESIS OF PROPYLENE GLYCOL BY REACTIVE DISTILLATION
SYNTHESIS OF PROPYLENE GLYCOL BY REACTIVE DISTILLATION
PROCESS SIMULATION AS A TOOL FOR THE CONCEPTUAL DESIGN OF
NEW PROCESSES
PROCESS SIMULATION AS A TOOL FOR THE CONCEPTUAL DESIGN OF
NEW PROCESSES
S. Galán1, R. De María1 & F. Domingo2
1ETSII-Universidad Politécnica de Madrid2Repsol-YPF, I&D Downstream, Química, Energía y Gas
AspenWorld 2000
OUTLINEOUTLINE
Propylene glycol production Reactive distillation
Use of simulation through the design process: Conceptual design Kinetic model development Pilot plant
Results: Steady state multiplicities Influence of variables
AspenWorld 2000
ReactionsReactions
Ok1
CH2-CH2-CH3 + H20 CH20H-CH0H-CH3
(PO) (MPG)
REACCION 2 O
k2CH20H-CH0H-CH3 + CH2-CH2-CH3 CH20H-CH-0-CH2-CH0H
CH3 CH3
(MPG) (PO) (DPG)REACCION 3
O k3
CH20H-CH-0-CH2-CH0H + CH2-CH2-CH3 CH20H-CH-0-CH2-CH-0-CH2-CH0H
CH3 CH3 CH3 CH3 CH3
(DPG) (PO) (TPG)
AspenWorld 2000
Glycol production at Repsol-YPFGlycol production at Repsol-YPF
2 plants: Puertollano (Spain): 20,000 t/a Tarragona (Spain): 50,000 t/a (@ 2000)
2/3 Tubular reactors + 7 distillation columns
Important issues: High Water/PO ratio to maximize MPG selectivity Running cost related to water excess Changes in product demand Process flexibility
AspenWorld 2000
Current processCurrent process
AspenWorld 2000
Reactive distillationReactive distillation
AspenWorld 2000
Conventional process vs. Reactive Conventional process vs. Reactive distillationdistillation
Conventional process Reactive Dist. ProcessAdiabatic tubular reactors Reactive distillation column
Multistage evaporation -
Drying column with high duty Less duty in drying column
High H2O/PO ratios for selectivity Stoichiometric ratios possible
No steam in reactors Steam consumption in react. col.
Water recycle from evap. & drying -
Selectivity from H2O/PO and recycle Selectivity from column operation
AspenWorld 2000
Simulation for Conceptual DesignSimulation for Conceptual Design
Preliminary design
Screening of process alternatives
Profitability analysis
Definition of a base flowsheet
AspenWorld 2000
Simulation for Kinetic ModelingSimulation for Kinetic Modeling
Experimental program
Data regression
Analysis of results
AspenWorld 2000
Simulation in the Pilot PlantSimulation in the Pilot Plant
TÍTULO:
PLANTA PILOTO GLICOLES
FECHA:
19/2/99DIBUJADO:
FDRREVISADO: COMPROBADO:
PROYECTO: NUEVOS DESARROLLOSDIBUJO Nº:
CWS
CWR
PI
PTTT
LV
PSHV
LIC
+/-
TIC
FI
NNF
PI
GLICOLES
DO3
DO4
DO5
D06
TT
TT
TT
TT
ACEITE TERMICO
MF
P03
E01
E02
E03
LT
PIC
TT
N2
RCW
VAPOR
SCW
COND.
FILT
PIC
TT
N2
RCW
SCW
COND.
TT
TI
CWS
CWR
TT
TI LG
PI
LG
O2i
DO1
D02
RECIPIENTE DE OP
RECIPIENTE DE AGUA TIC
AGUA
OP
AspenWorld 2000
Design of the Pilot PlantDesign of the Pilot Plant
AspenWorld 2000
Temperature profilesTemperature profiles
AspenWorld 2000
Steady State MultiplicitiesSteady State Multiplicities
AspenWorld 2000
Composition profilesComposition profiles
AspenWorld 2000
Reaction rate profilesReaction rate profiles
AspenWorld 2000
Feed and pressure influenceFeed and pressure influence
AspenWorld 2000
Pressure influencePressure influence
AspenWorld 2000
Boil-up ratio influenceBoil-up ratio influence
AspenWorld 2000
Software ToolsSoftware Tools
ASPEN PLUS
MATLAB for data analysis
PITCON & AUTO for detection of multiplicities by homotopy continuation methods
ABACUSS for dynamic simulation
AspenWorld 2000
ConclusionsConclusions
A process for MPG by hydration of PO in a (reactive) distillation column is considered profitable.
The interaction between reaction and separation introduces a more complex behaviour leading to new challenges in design, operation and control.
Repsol-YPF has been applying succesfully simulation (Aspen Plus) as a key tool through the development process. At this time, in the pilot plant stage.
AspenWorld 2000
Santos Galán ([email protected])
Francisco Domingo ([email protected])
http://www.diquima.upm.es/proyectos/glicoles/glicoles.html
