v3 case studies
TRANSCRIPT
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Bioprocess SimulationCase Studies
E. Heinzle
Biochemical Engineering Department
Saarland University
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Training Case: CellulaseProduction
Cellulose is most common organic compound on earth
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Process Flow Diagram (Cellulase)
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Model parameter Value Source
Bioreaction
Initial cellulose concentration (g/L) 45 [17, 20]
Yield (g cellulase/g cellulose) 0.33 [17]
Productivity (g cellulase/L h) 0.125 [17]
Utilization cellulose (%) 90 own estimate
Initial CSL concentration (g/L) 7.5 [15, 16]
Nutrients/trace elements (g/L) (sum) 4.1 [15, 16]
Utilization CSL + nutrients (%) 75 own estimate
Ammonia added (g/L) 1.0 own estimate
CO2 formation (g/L fermenter volume) 18 [20]
Final cellulase concentration (g/L) 13.4 calculated
Fermentation time (h) 107 calculated
Final biomass concentration (g dcw/L) 15 [20]
Bioreaction conditions
Inoculum volume (% of working volume) 5.0 [15, 16]
Working volume vessel (%) 80 [15, 16]
Aeration rate (vvm) 0.58 [17]
Specific agitator power (W/m3
) 500 [17]Fermentation temperature (C) 28 [20]
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Material Balance of Cellulase Production
Component Input (kg/kg P) Output (kg/kg P)
Ammonia 0.08 -
Biomass - 1.17
Carbon dioxide - 1.48
Cellulase
in final product
product loss
-
1.0
0.04
Cellulose 3.62 0.35
Corn steep liquor 0.61 0.15
Nutrients 0.33 0.08
Water 77.4 77.8Sum 432 432
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Cellulose Production Scenarios
Scenario
Annual
production
(metric tons)
Capital
investment
($ million)
Unit production
cost ($/kg
cellulase)
Base case 456 20.6 15.4
10% inoculum 475 23.4 16.4
Additional
chromatography385 22.1 20.4
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Sensitivity Analysis Yield Cellulase
0 10 20 30 40 50 600
10
20
30
40
50
60
Unitproductio
n
cost($/kg)
Yield (%)
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Data Variation for MCS Cellulase
ParameterValue base
modelProbabilitydistribution
Variation
Yield (g/g) 0.33 normal V = 20%; range: 0.22 - 0.44
Productivity (g/L h) 0.125 normal V = 20%
Aeration rate (vvm) 0.58 even 0.3 to 0.8
Specific power(kW/m3)
0.5 triangular0.4 to 1.2, 0.5 as the most
likely
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Probability Distribution of UnitProduction Cost (UPC)
10 15 20 25 30
0
50
100
150
200
250
300
350
400
Frequency
Unit production cost ($/kg P)
Aeration rate
Productivity
Yield
-75 -50 -25 0 25 50 75
Contribution to variance (%)
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Total Capital Investment CellulaseCost item Multiplier Base Cost ($ thds.)
Delivered purchased equipment cost (PC) 3,290
Installation variable PC 1,060
Process piping 0.35 1,150
Instrumentation/control 0.4 1,320
Insulation 0.03 100
Electrical systems 0.10 330
Buildings 0.45 1,480
Yard improvement 0.15 490
Auxiliary facilities 0.4 1,320
Total plant direct cost (TPDC) 10,550
Engineering 0.25 TPDC 2,640
Construction 0.35 3,690
Total plant indirect cost (TPIC) 6,330
Total plant cost (TPC) = TPDC + TPIC 16,880
Contractors fee 0.05 TPC 840
Contingency 0.1 1,690
Direct fixed capital cost (DFC) 19,410
Land 0.015 DFC 290
Start up & validation 0.05 970
Working capital 30 days - 270
Total capital investment (TCI) 20,650
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Annual Total Production Cost CellulaseCost item Multiplier Cost ($ thds./year)
Variable costs
Raw materials 256
Consumables 112
Labor
Basic labor cost (BLC)
Fringe benefits
Supervision
Administration
Total labor cost (TLC)
25,840 h/year
$26/h
0.4 BLC
0.2 BLC
0.5 BLC
-
672
269
134
336
1,410
Operating supply 0.1 BLC 67
Laboratory/QC/QA 0.15 TLC 222
Utilities 1,161
Waste treatment & disposal 64
Royalties -
Fixed costs
Depreciation period 9.5 years
Depreciation 0.095 DFC 1,840
Insurance 0.01 DFC 194Local tax 0.02 DFC 388
Maintenance & repair equipment specific 1,280
Plant overhead cost 0.05 DFC 970
General expenses
Distribution & marketing - -Research & development - -
Total product cost 6,990
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Case Studies
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Citric acid 5Aspargillus
Stoichiometric modelFilamentous fungus
Pyruvic acid 6
Escherichia coli Detailed stoichiometric model, liquid-
liquid extraction versus electrodialysis,scenario analysisBacterium
L-Lysine 7Corynebacterium glutamicum Dynamic bioreaction model coupled to
process model, sensitivity analysisBacterium
Riboflavin 8Eremothecium ashbyii
Batch productionFilamentous fungus
a-Cyclodextrin 9Cyclodextrin glycosyl transferase
Enzymatic conversion, scenario analysisEnzyme
Penicillin V 10Penicillium chrysogenum Detailed process model, uncertainty
analysis using Monte-Carlo simulationFilamentous fungus
Recombinant HumanSerum Albumin
11Pichia pastoris
New process, recombinant therapeuticprotein from yeast, comparison ofadsorption processes, scenario analysisYeast
Recombinant HumanInsulin
12Escherichia coli
Therapeutic protein from E. coli, proteinprocessing and refolding, detailed model
of complex process, schedulingBacterium
Monoclonal Antibody 13Chinese hamster ovary cells Animal cell culture, uncertainty analysis
using scenarios, sensitivity analysis andMonte-Carlo simulationMammalian cell
-1-Antitrypsin fromTransgenic Plant Cell
Suspension Culture
14Transgenic rice cells
Plant cell culture, feasibility studyPlant cell
Plasmid DNA 15 Therapeutic DNADNA for gene therapy and genevaccination
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Case Studies
Pyruvic acid (National Research Center Jlich, IBT I + II)
Fermentation (E. coli) Optimization microorganism
Optimization process
-Cyclodextrin (TU Harburg, Technische Mikrobiologie)
Existing enzymatic process
Optimization enzyme (CGTase)
OH
O
O
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-Cyclodextrin: Starting PointExisting enzymatic process
Optimization enzyme(CGTase, evolution of extremophilic enzyme)
1. Modeling and assessment of the existing process
(based on literature, patents and expert knowledge)2. Modeling and assessment of potential process improvements
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Reaction Scheme
Cyclodextrin production
Starch Dextrin
MaltoseGlucose
-Cyclodextrin
-Cyclodextrin
-Cyclodextrin
Complexing agent
-Cyclodextrin-Complex
Biwer et al., Appl.Microbiol.Biotech. 2002: 59, 609-617
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Process Schemes
Cyclodextrin Production
Enz. Convers. + Complex
Separation Complex
Washing Complex
Steam Distillation
Decolorization
Crystallization
Vacuum Filtration
Drying
Solvent-Process
Enzymatic Conversion
Adsorption Column
Decolorization
Crystallization
Vacuum Filtration
Drying
Non-Solvent-Process
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0,00
0,02
0,04
0,06
0,08
0,10
Solvent Process Non-Solvent Process
EI[IndexPoin
ts/kgP]
Decanol
other C-Compounds
Cyclodextrins
Glucose + Maltose
Starch + Dextrin
Output
Comparison:Solvent Process Non-Solvent Process
Carbohydratesin waste
Product loss
Decanol lessimportant
Energy DemandSolvent-Process:
18 MJ/kg P
Energy DemandNon-Solvent-Process:
13 MJ/kg P0 2 4 6 8Reactor
Centrifugation
Steam Distillation
Adsorption
Crystallization
Vacuum Filtration
Dryer
Specific Energy Demand [MJ/kg P]
Solvent Process
Non-Solvent Process
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Sensitivity Analysis:
Yield Enzymatic Conversion
Environmental Indexhighly sensitive for yield
Specific energy demandhardly sensitive for yield
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90Yield Enzymatic Conversion [%]
EI[IndexPo
ints/kgP]
Non-Solvent Process
Solvent Process
0
5
10
15
20
25
20 30 40 50 60 70 80 90Yield enzymatic conversion [%]
Sp.
EnergyDeman
d[MJ/kgP]
Solvent Process
Non-Solvent Process
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Sensitivity Analysis:
Volume Eluate Adsorption
0
10
20
30
40
50
0 0,5 1 1,5 2 2,5 3
Volume Eluat [bv]
specificEnergyDemand[MJ
/kgP]
Non-Solvent ProcessSolvent Process
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Conclusion Cyclodextrin
Standard process already shows manyadvantages of biotechnological processes
Increase of yield = highest potential for
improvement Purification including adsorption yields no
significant improvements
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Monoclonal Antibodies (Mab) Scientific:
adaptive proteins
In vitrouse (antigen identification, antigen purification)
In vivouse (therapeutic applications, diagnostic tools)
Commercial: Growing market: 2,400 kg in 2006 (Chovav et al., 2003)
New MAb entering the market; in the biopharmaceutical
development pipeline Need for new production facilities and optimization of
existing plants
Chovav et al.: The state of biomanufacturing; UBS's Q-series: London, 2003.
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Process Steps MAb ProductionRaw material + inoculum
preparetion
Hybridoma fermentation
Biomass removal
Chromatographic steps (2-4)
Viral inactivation
Formulation of final product
Typical steps of proteinproduction
Mammalian cell lines
Exact process flow diagramdepending on MAb
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Basic Assumptions
2 x 15 m3 fermenter
1 g/L Mab
5% of batches fail
326 operating days
14 days fermentation time + 1.5 days lack
time
90% yield in each downstream step
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InoculumPreparation
Seed train:
Starting from T-flasks
Six steps
Volume factor: 7.5 Duration: 24 days
Inoculum Prep
P-1 / TFR-101
T-Flask (225 mL)
P-2 / RBR-101
Roller Bottle (2.2 L)
P-5 / SBR1
First Seed Bioreactor (1000 L)
P-6 / V-102
Media Prep
P-7 / DE-101
Sterile Filtration
P-11 / V-104
Media Prep
P-12 / DE-102
Sterile Filtration
P-10 / SBR2
Second Seed Bioreactor (5000 L)
S-101
S-102
S-103
S-111
S-112 S-113
S-115
S-114
S-119
S-130
S-121
S-122S-123
S-125
S-124
S-129
S-120
S-
P-3 / BBS-101
Bag Bioreactor (20 L)
S-104
S-105
S-107
P-4 / BBS-102
Bag Bioreactor (100 L)
S-106
S-108 S-110
S-109
P-9 / AF-101
Air Filtration
P-8 / G-101
Gas Compression
S-116
S-117
S-118
P-13 / G-102
Gas Compression
P-14 / AF-102
Air Filtration
S-126
S-127
S-128
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Bioreaction
2 x 15 m3 working volume in staggered mode 1 g/l MAb after 14 days fed-batch
25 g media/Liter (equal $5/L fermenter volume)
P-20 / PBR1
Production Bioreactor (20000 L)
P-21 / V-106
Media Prep
P-22 / DE-103
Sterile Filtration
-
S-149
S-140
S-141 S-142
S-144
S-143
Bioreaction
P-24 / AF-103
Air Filtration
P-23 / G-103
Gas Compression
S-145
S-146
S-147
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Primary Recovery + Protein A
Biomass removal: Centrifugation + Filtration
1st Chromatography step: Protein A (affinity) Viral inactivation: Acid treatment
P-30 / V-101
Surge Tank
P-33 / V-103
Storage
P-40 / C-101
Prot-A Chromatography
P-42 / V-108
Pool Tank / Viral Inactivation
PrA-Equil
PrA-Wash
PrA-Eluat
PrA-Reg
S-161
P-41 / DE-105
Polishing FIlter
S-160
S-163
S-162
S-165
P-31 / DS-101
Centrifugation
P-32 / DE-108
Polishing Fitler
S-150
S-152
S-151
S-154
S-153
Primary RecoveryProtein-A
S-155
S-164
S-156
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IXC, HIC + Final Formulation Ion exchange chromatography (gradient elution) Hydrophobic interaction chromatography
Concentration, buffer change and product stabilization
P-50 / C-102
IEX Chromatography
P-52 / V-109
IEX Pool Tank
IEX-Equil
IEX-Wash
IEX-WFI
IEX-Eluat
IEX-Strip
S-170
S-174
P-60 / C-103
HIC Chromatography
P-62 / DE-106
Nanofiltration
P-70 / V-110
HIC Pool Tank P-71 / DF-103
Diafiltration
P-72 / DE-107
Final Polishing Filtration
P-73 / DCS-101
Final Cooling
S-175
HIC-Equil
HIC-Wash
HIC-Eluat
HIC-Reg
S-180
S-185
S-184
S-190
S-191
S-192
S-193
S-195
S-197
S-196
Final Product
IEX-Rinse
IEX Chrom HIC Chrom
Final Filtration
S-194
P-51 / MX-102
Mixing
P-61 / MX-103
Mixing
S-171
S-172
S-173
S-181
S-182
S-183
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Base Case: Inventory Analysis
9.5 kg Mab per batch
x 34 batches per year
= annual production 307 kg
4,600 tons/year raw materials 14,900 kg/kg Mab in final product
Purchased Equipment cost: $9.3 million
Total Capital Investment (TCI): 129 million
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Operating Costs Total Operating Costs: $40 million/year
TOC: 55% bioreaction + inoculum; 45% downstream
Unit Production Costs: $131/g final product
0 5 10 15 20 25
Raw Materials
Labor-Dependent
Facility-Dependent
Laboratory/QC/QA
Consumables
Waste Treatment/Disposal
Utilities
Operating Cost
$ million/year
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Status Mab case
Base case model Based on assumptions and estimates
Best guess for economic key metrics
Existing variability not know
Possible alternatives and variations not
considered
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Areas of Uncertainty
Waste
Consumables
FinalProductUtilities
Labor
RawMaterials
BioreactionDownstreamProcessing
Supply Chain MarketProcess
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Uncertainty Analysis: Elements
EnvironmentalAssessment
Process Model
Uncertainty Analysis
Process Data, Literature,Estimates
EconomicAssessment
Monte CarloSimulations
SensitivityAnalysis
Same PFD
ScenarioAnalysis
Different PFD
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Objective Functions
First Step: Selection of objective functions:
Technical performance: Annual amount of
productEconomic performance: Unit ProductionCost, Return on Investment
Environmental performance: EnvironmentalIndices
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Scenario: # of Fermenter
Parameter 1 x 30 m3 2 x 15 m3
Investment
Annual Amount ofProduct
Unit Production Cost
Lower investment in downstream units overweights higherfermenter cost
Higher labor cost + lower amount of product cause higher UPC
Handling, failure risks
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Scenarios: Chromatography steps
Parameter TCI UPC AnnualAmount
Additional gel filtration + 33%
Additional IXC + 18%
Removal HIC - 16%
Replacement Prot A byIXC
- 9%
Base case: Protein A IXC - HIC
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Sensitivity Analysis
PFD usually not changed
Impact of a single key parameter
Technical, supply chain or market parameters
Identification of the most sensitive parameters
Does not expresses probabilities
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Sensitivity: Mab Concentration I
Curves level off at around 2g/l
Further improvement only through change of PFD
0
50
100
150
200
250
0 0.5 1 1.5 2 2.5 3 3.5
Final Product Concentration (g/l)
UPC($/g)
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Sensitivity: Mab Concentration II
Annual raw materialcost (media, buffers)and consumables
(resins) increase withincreasing amount ofproduct
Facility dependent and
annual labor almostcost constant
Cause lower UPC
0
5
10
15
20
25
30
0 0,5 1 1,5 2 2,5 3 3,5
Final Product Concentration (g/l)
($
Million) Raw Materials
Facility
Labor
Consumables
0
25
50
75
100
125
150
0 0,5 1 1,5 2 2,5 3 3,5
Final Product Concentration (g/l)
($/g)
Raw Materials
Facility
Labor
Consumables
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Sensitivity: Yield
Relatively small impact on UPC
100
110
120
130
140
150
0 10 20 30 40 50
Yie ld Ra tio (g/g)
UPC($/g)
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Figure 3-9
Random Number
Generation
SuperPro Model Crystal Ball
MS Excel
ResultsResultsVariables
Initiatessimulation
VBA Script
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Technical parameters: Duration, yield + final Mab concentration in the
fermenter
Aeration rate fermenter Replacement frequency chromatography resins
Yield chromatography steps
MCS: Selection Input Variables
Market parameter- Selling price Mab
Supply Chain parameters- Price media- Price resins
- Price electricity
Parameters that routinely exhibit uncertainty in model/process:
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Probability Distribution Variables
0,000
0,005
0,0100,015
0,020
0,025
10 12 14 16 18
0,000
0,005
0,010
0,015
0,020
0,63 0,71 0,78 0,85 0,93
0,000
0,005
0,0100,015
0,0200,025
4,1 4,4 4,7 5,0 5,4
Triangular distribution: e.g.
Fermentation time (base casevalue as the most likeliest)
Normal distribution: e.g. HICyield (std-dev. 10%)
Weibull distribution:Electricity price (empiricaldata)
S P b bili Di ib i
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Source Probability Distributions
Experimental data, e.g.:
Fermentation parameters like yield, concentration,duration
Empirical/statistical data, e.g.:
World market price sugar (1996-2002)
Electricity price (U.S. Market 2000-2004)
Supplier information, e.g.: Price, yield, service life resins + membranes
Literature data, e.g.:
Fermentation parameters Raw material prices
Expert opinion and own estimates:
All parameters without directly accessible data
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Random Number
Generation
MCS: Computational Structure
SuperPro Model Crystal Ball
MS Excel
ResultsResultsVariables
Initiatessimulation
VBA Script
P b bilit di t ib ti UPC
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Probability distribution UPC
Mean: $138/g
St-Dev: $34/g Var: 25%
Min: $62/g
Max: $424/g
90%-Perc.:$183/g
80%-Perc.:$163/g
Forecast: Unit Production Cost
0
500
1000
1500
2000
2500
52 112 172 232 292($/g MAb)
F
req
u
en
cy
UPC: Fermentation versus
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UPC: Fermentation versus
Downstream Parameter
0
0,01
0,02
0,03
0,04
0,05
0,06
0,07
50 100 150 200 250 300 350
UPC ($/g)
Probability MCS-FP
MCS-DSP
FP: 126 +/- 22 $/g
DSP:144 +/- 24 $/g
UPC: All Groups
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UPC: All Groups
0
0,01
0,02
0,03
0,04
0,05
0,06
0,07
50 100 150 200 250 300 350UPC ($/g)
Probability
MCS-AP
MCS-TP
MCS-SCMP
MCS-FP
MCS-DSP
TP: 138 +/- 34 $/g
SCP:131 +/- 2 $/g
Parameter Contribution
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Parameter Contribution-75% -50% -25% 0% 25% 50% 75%
Media Pow der Price
Unit Cost Protein A Resin
Unit Cost IXC Resin
Unit Cost HIC Resin
-75,0% -50,0% -25,0% 0,0% 25,0% 50,0% 75,0%
Final MAb Concentration
Product Yield HIC
Product Y ield IXC
Product Yield Prot A Chr.
Rplc. Frequency Protein A
Fermentation Time
Allparameters
Supply chainparameters
ROI: Technical versus Supply
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ROI: Technical versus Supply
Chain/Market Parameters
0
0,01
0,02
0,03
0,04
0,05
0,06
0 50 100 150 200 250
ROI (%)
P
robability
MCS-TP
MCS-SCMP
TP: 110 +/- 33%
SCMP:110 +/- 25%
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ROI: Parameter Contribution
-75% -50% -25% 0% 25% 50% 75%
Final MAb Concentration
MAb Selling Price
Fermentation Time
Product Yield HIC
Product Yield IXC
Product Yield Prot A Chr.
Contribution all parameters
Environmental Indices
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Environmental Indices
0
100
200
300
20 36 52 68 84
EI Input (IP/kg P)
Frequency
Parametercontribution
similar to UPC
EI Input
-75% -50% -25% 0% 25% 50% 75%
Final MAb Concentration
Product Yield HIC
Product Yield IXC
Product Yield Prot A Chr.
-75% -50% -25% 0% 25% 50% 75%
Product Y ield HIC
Product Y ield IXC
Fermentation Yield
Product Yield Prot A Chr.
Input Output
Results Mab
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Results Mab
Better understanding of key parameters and processalternatives
Most contributing parameters largely the same foreconomic and environmental variability
Mab concentration and chromatography yields contributemost to the uncertainty
Potential improvements:
Increase MAb concentration to around 2 g/L Reduce to only two chromatography steps (media
composition, strain requirements, by-products)
Conclusion
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Conclusion
Uncertainty addressed by a combination of scenario +sensitivity analysis + Monte Carlo simulation
Representative process model and a thoroughevaluation of base case are crucial
The connection of a process simulator with MonteCarlo software enables a time-efficient quantification
Monte Carlo simulations provide a most probablevalue and an expected range of values
Allows to prioritize the parameters that impacteconomic and environmental performance
R&D effort can be directed to the most important risksand the most promising opportunities
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Acknowledgement
Intelligen Inc. (N.J.): Demetri Petrides, JohnCalandranis, Evdokia Achilleos
Charles Cooney and Group at MIT
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Process Diagram
Final
Product
RawMaterials
Utilities
Waste
Consumables
Labor
BioreactionDownstream
Processing
Consumables
Waste
Facility-Dependent Costs: MAb
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Facility Dependent Costs: MAb
Direct Fixed Capital (DFC) $ 165.7 Million
Insurance 0.015 = 2.5
Local Taxes 0.025 = 4.1DFC
Contractors Fee 0.055 = 9.1
Annual Facility-Dependent Cost $ 42.3 Million
Depreciation period 10 years
Depreciation 0.10 = 16.6TCI
Maintenance 0.06 = 9.9
Operating Cost MAb
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Operating Cost MAb
Laboratory/QC/QA 0.6 = 2.3TLC
Operating Cost $ 60.3 Million
Raw Materials 3.5
Consumables 8.2
Total Labor Cost (TLC) 3.9
Utilities 0.024
Waste Treatment/Disposal 0.006
Facility-Dependent Costs 42.3
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Figure 3-5
P-1 / V-101
Seed Fermentation
P-12 / G-104
Gas Compression
P-18 / MX-101
Mixing
S-101
S-102
S-103
S-106
S-107
S-108
S-109
S-110
P-2 / V-102
Seed Fermentation
P-3 / G-101Gas Compression
P-5 / MX-102
Mixing
S-111
S-112
S-113
S-116
S-118
S-119
S-120
S-117
P-4 / ST-101
Heat Sterilization
S-114
S-115
P-6 / V-103
Seed Fermentation
P-7 / G-102
Gas Compression
P-8 / MX-103
Mixing
S-122
S-123
S-124
S-125
S-126
S-127
S-128
S-121
P-9 / ST-103
Heat Sterilization
S-129
S-130
P-11 / G-103
Gas Compression
P-13 / MX-104
Mixing
S-132
S-133
S-134
S-136
P-10 / ST-104
Heat Sterilization
P-15 / V-104
Fermentation
S-131
S-135
S-137 S-138
S-139
S-140
P-16 / RVF-101
Rotary Vacuum Filtration
S-141
S-143S-144
P-17 / UF-101
Ultrafiltration
S-142
S-145
S-146
P-14 / ST-102
Heat Sterilization
S-104
S-105