HEAT AND MASS TRANSFER UNIT OPERATIONS
UOP15 Fixed Bed Adsorption Unit - Issue 1
UOP15 demonstrates the adsorption of a solute, carbon dioxide, from a binary gas mixture onto the surface of a solid adsorbent, activated carbon. The process takes place in a fixed bed adsorption column. The adsorption and desorption/regeneration processes are monitored using temperature sensors sited at intervals along the column and also by carbon dioxide measurement of the exit gas using an infra red (IR) detector.
ORDERING SPECIFICATION
• A bench top unit comprising a vacuum formed ABS plastic plinth
with integral electrical console onto which is mounted the stainless steel,
packed fixed bed adsorption column, hot water circulation system and infrared
detector.
• The hot water circulator system connected to the column jacket allows
automatic control of temperature adsorption to a set point value.
• Gas feed flow rate can be controlled between 0 and 5 l/min.
• The Bed Adsorption column has the following specifications:
- Height 325 mm, diameter 58 mm
- Stainless steel jacket for temperature control
- Gas distribution plate at entry to column
- Bed of glass beads for good gas distribution and maintenance of steady-state
temperature
- Six thermocouples spaced evenly along the length of the column
• All electrical circuits are protected by appropriate safety devices.
• The control console incorporates an electronic display: PID controller
display, including the set-point temperature.
• USB interface and sophisticated data logging software are included
Demonstration Capabilities
Teaching exercises are included to familiarise students with the following
aspects of a relevant technology:
> Study of the Adsorption/Desorption processes under different operational
conditions: temperature, flow rates, molar fraction and pressure
> Study of the breakthrough curves of temperature profiles during
the adsorption/desorption process
> Study of the quasi-isothermal regime at low concentrations and pressures
and how these variables can affect it
> Study of the Solute Movement Theory model which describes
the adsorption/desorption process
> Familiarization with the formation of the compressive and dispersive fronts
in adsorption processes
> Analysis of the breakthrough curves of CO2 during the adsorption
and desorption/regeneration processes
> Obtain the adsorption equilibrium isotherm of CO2
from the desorption curve (dispersive wave)
Description
DESCRIPTION
The UOP15 introduces students to the fundamentals of adsorption and desorption
processes using a packed bed reactor. The unit is fitted with a stainless
steel reactor column in which the adsorbent, activated carbon, is packed.
There are six thermocouples (T1 - T6) sited along the length of the column
which allow the adsorption/desorption fronts to be followed (Adsorption/desorption
of CO2 leads to changes in temperature).
A hot water circulation system, also containing a thermocouple (T7), is
connected to the jacket of the column to enable accurate temperature control
via a PID temperature controller so that the desired processing temperature
is accurately maintained.
The system is equipped with all the valves required for flow direction
control, flow rate control and pressure relief for safety.
Electronic flowmeters monitor the flow rate of both the carrier gas, helium
and the absorbate, carbon dioxide. These combined with the column temperature
sensors and the IR detector, for measuring CO2 concentration;
enable the processes to be followed closely and a wide range of operating
variables to
be examined.
There is a divert path around the column which is used for calibration
of the IR detector and also setting up of process conditions prior to beginning
an experiment.
The recommended operation variables are flowrates of 0-5 SLPM and pressures
of 0 - 0.3 bars. Such operating pressures suit safe operation and provide
ideal conditions for the adsorption/desorption processes.
The UOP15 column is easily loaded with the activated carbon supplied or
the operator could use their own variety thus enabling performance comparison
of different adsorbents.
All important sensors used on the unit are electronic and provide outputs
for data logging and analysis. The data logger, provided with the unit,
interfaces between the UOP15 unit and the user’s computer using a
USB port.
The associated software allows graph plotting and provides full instructions
on setting up the equipment and performing the experiments.
All related theory and full help texts are provided. The software requires a computer running Windows 98 or later with a USB port.
ARMSOFT Armfield software
For further details of the comprehensive capabilities of Armfield software
please visit: www.armfield.co.uk/armsoft.php
Technical Details
Operation pressure 0-0.5 bars
Gas flow rates 0 < 5 SLPM (He) 0 < 1 SLPM (CO2)
Column capacity 480 cm3
Gases CO2, He Relief valve pressure 20 psi
Column operating temperature 25 - 45o°C
Essential Accessories
Software requires a computer running
Windows with a USB port.
(Computer not supplied by Armfield).
Requirements
Electrical supply:
Single phase Electrical supply:
UOP15-A: 220/240V/1ph/50 Hz@10A
UOP15-B: 120V/1ph/60 Hz@15A
UOP15-G: 220V/1ph/60 Hz@10A
Gases:
Gases:
CO2 5 SLPM,1 bar max
Helium 1 SLPM,1 bar max
NOTE: The equipment should be run in a ventilated room.
Shipping specification
Volume: 0.44m3
Gross weight: 45kg
Overall dimensions
Height: 0.60m
Length: 0.50m
Depth: 1.00m
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