CHEMCAD DCOLUMN

Dynamic Column Software

GENERAL FEATURES:

1. Can begin the simulation as a stratup or from a steady-state condition.
2. Holdups can be:
• Ignored
• Constant or variable
• Liquid and/ or vapor
• Specified in mass, molar or volumetric units
• Specified for the condenser, reboiler, or any stager
• Specified on each stage
3. Pressure can be fixed or calculated.
4. Simulation can be performed using rigorous mass transfer analysis or using the equilibrium stage approach
5. Packed columns can be calculated using rigorous mass transfer analysis or assuming equilibrium stages.
6. Multiple liquid phases
7. Discrete event scheduler
8. Pressure drop calculations included
9. Fully integrates with CHEMCAD, CC-ReACS, and CC-Therm

START-UP FEATURES:

1. Dry or Wet tray strtups
2. Fixed or variable pressure
3. May specify startup duration time and reboiler duty
4. open or closed loop control simulation

CONDENSER FEATURES:

1. Holdup:
• Can be constant or variable
• Specified in mass, mole or volume units
• Set by a control valve
2. Reflux can:
• Be specified in mass, mole or volume units
• Set by a control
3. Distillate can:
• Be specified in mass, mole, or volume units
• Set by a control valve
4. Condenser U*A can be set. Cooling fluid flowrates can be fixed or controlled
5. Condenser accumulator Vessel specification options:
• Orientation
• Head type
• Diameter and length
• Initial liquid level

REBOILER FEATURES

1. Holdup can be variable or constant
2. Bottoms liquid product rate can be:
• Specified in mass, mole, or volume units
• Set by a control valve
3. Reboiler U*A can be set. Heating fluid flowrates can be fixed or controller
4. Reboiler vessel option:
• Orientation
• Head type
• Diameter and length
• Initial liquid level

CONTROL VALVE OPTIONS:

1. Equal percentage or linear values
2. Valve coefficient
3. Rangeability
4. Critical flow factor
5. Valve position function

Controller Options:

1. PID (proportional, integral, derivative) action can be specified
2. Controller set points can be purity, temperature, pressure, level, flow, or any other flowsheet variable
3. Cascade and split range controllers can be used
4. Sensor functions can be specified
5. Controller limits may be set:
• With or without upper or lower limits
• Relative to the set points
• At a specified value

MASS TRANSFER ANALYSIS

1. Automatically calculates the component diffusivities
2. Rigorous calculation of the mass transfer coefficient

REACTIVE DISTILLATION:

1. Reactions can be kinetic or equilibrium
2. Multiple rate forms available
3. Vapor and/or liquid reactions are permitted