Stripping Column Scheme
Simulation
Rigorous process modeling and equipment sizing for a multi-column stripping scheme, validating MELLAPAK structured packing parameters and precise condenser heat duties.
Project Overview
ChemKlub India collaborated with Knexir Consultants to develop a robust simulation model for a multi-stage stripping column scheme handling a complex multi-component feed (BLR, Toluene, Butyl Cellosolve).
The primary objective was to calculate highly precise column parameters—specifically the required diameters and packing heights—along with the heat duties for the associated network of six condensers and two preheaters.
Our simulation ensured all bottom product specifications were successfully achieved, while identifying optimal utility loads for cooling water (CW), chilled water (CHW), and medium pressure steam (MPS).
Tools & Components
Aspen V14
Process Modeling
MELLAPAK Packing
Column Internals
Thermal Analysis
Heat Transfer Evaluation
4-Phase Design Methodology
A rigorous approach to simulation modeling, ensuring accurate mass transfer and fluid dynamic calculations.
Model
Building the steady-state simulation model in Aspen based on client PFD, input compositions (BLR >97%), and strict 10 MLC pressure drop limits.
Sizing
Calculating hydraulics and mass transfer requirements to determine specific diameters (0.42m, 0.29m, 0.2m) and 5m packing heights.
Thermal
Extracting heat duties across the primary and secondary condenser networks (e.g., 0.19 Gcal/hr CW) to manage vapor phase transitions.
Deliver
Compiling final Heat and Mass Balance (HMB), exchanger area calculations, and total utility usage rates for final design approval.
Scope of Work
Our deliverables provided the EPC and fabrication teams with comprehensive, validated data across the entire stripping circuit.
Project Compliance
100% SPEC COMPLIANCE
Aspen V14 Models
Complete steady-state simulation model tailored to the custom stripping configuration.
Hydraulic Sizing Specs
Diameters and 10-stage packing height determinations for 3 distinct column vessels.
Heat Transfer Duties
Calculated areas and thermal duties for pre-feed heaters and stripping steam exchangers.
HMB Validation
Comprehensive Heat and Mass Balance data verifying exact top and bottom product specs.
Utility Network Sizing
Condenser cooling requirements segregated precisely by CW and CHW networks.
Executive Reporting
Detailed design document report summarizing the entire stripper scheme architecture.
Engineering Challenges & Solutions
High Purity Requirements
Achieving stringent bottom product purity (driving Toluene to zero and keeping Butyl Cellosolve below 0.05%) while managing an 8,495 kg/hr feed rate.
Engineering Solution
Optimized the introduction of super-heated stripping steam (145°C) and configured precisely sized 10-stage MELLAPAK packed beds to guarantee mass transfer efficiency.
Strict Pressure Constraints
Allocating massive heat duties across a dual-condenser setup per column while staying within strict 10 MLC allowable pressure drop constraints on the utility side.
Engineering Solution
Rigorously simulated the phase envelopes to safely split duties, calculating exact utility loads for CW in the primary stage, and dedicated CHW in the secondary stage.
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