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IsoSORP® SERIES
GRAVIMETRIC SORPTION ANALYZERS
p Adsorption Isotherms and Kinetics
by Gas Physisorption and Chemisorption
Measurements with Catalysts, Zeolites,
Activated Carbon, Clay, Silica, Molecular
Sieves
p Surface Area and Porosity
by Gas Physisorption, Density and Buoyancy
Measurements with Catalysts, Zeolites,
Activated Carbon, Clay, Silica, Molecular
Sieves
p Absorption and Solubilities
by Gas Solubility Measurements in
Polymers, Liquids and other Materials
p Gas Storage
Gas Storage Capacity Measurements
with New and Classical Materials (Metal
Organic Frameworks, Metal Hydrides,
Carbon Nano Tubes, Ionic Liquids)
p Diffusion and Permeation
Measurements of Diffusion Coefficient
of Ad- / Absorption Processes of Gases and
Mixtures
p Separations
Measurement of the Selectivity of Mixed
Gas Sorption
p Temperature Programmed Desorption
Determining Binding Energies or Heat
of Adsorption by Desorbing Loaded Sample
Material at Elevated Temperature
p Vapor Permeability and Diffusivity
Measurements of Membranes, Packing
Materials, Blisters and Foils
p Wetting and Drying Processes
of Pharmaceuticals, Construction Materials
and Solid Fuels
p Corrosion Studies
of Alloys for High Temperature Applications
in Power Plants or Gas Turbines
p Filter Material Testing
by Measuring the Capacity and Selectivity
for Pollutants
p Incineration or Conversion of Toxic
Biological and Chemical Materials
by High Temperature and/or High Pressure
Vapor
p Catalyst
Sulphidation Processes, Coking and
Lifetime Testing
Magnetic Suspension Balance
The heart of the IsoSORP® instruments is the Magnetic Suspension Balance for accurately
weighing the sample material. Rubotherm’s patented Magnetic Suspension Balance allows
highly accurate weight measurements of samples in closed vessels to be performed. The
sample is weighed from the outside and the suspension force is contactlessly transmitted
from the pressurised measuring cell to a microbalance at ambient atmosphere. This means
that mass changes of a sample in a closed reactor can be recorded even under extreme
conditions with the utmost accuracy.
The unique features of the Magnetic Suspension Balances are:
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p
p
p
p
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Contact free weighing in hermetically closed reactors with patented
magnetic suspension device
Hermetic separation of measurement area (sample) and weighing area (balance) to
avoid any damage, destruction or interference from the process media (e.g. corrosive
gases, vapors), pressure or temperature.
The reactor of the Magnetic Suspension Balance is completely
metal sealed, even highly aggressive or corrosive atmospheres
can be used for measurements in a wide pressure and
temperature range.
Excellent long term stability: The sample can be
automatically disconnected from the balance at
any time to re-tare and/or calibrate the balance and
reconnected and returned to the measuring position to
continue the measurement. High precision long term
measurements can be performed without any baseline
drift or accuracy loss.
Modular construction: The Magnetic Suspension Balance can
be easily adapted to new applications.
For thermobalance applications no other instrument than
the patented Magnetic Suspension Balance is able to work with
high pressure and high temperature at the same time and
additionally handle aggressive media (e.g. H 2 S at high pressure
and/or temperature) and vapors.
The IsoSORP® instruments can be equipped with different
versions of the Magnetic Suspension Balance with the following
specifications:
Magnetic Suspension Resolution Dynamic Weighing Range
Balance Type
(Sample Mass)
A 10 0.01 µg 200 mg
A 100 0.1 µg 1 g
E 1 1 µg 10 g
E 10 10 µg 25 g

IsoSORP® SERIES
GRAVIMETRIC SORPTION ANALYZERS
TEMPERATURE CONTROL
O P E R AT I N G P R E S S U R E R A N G E
350 bar
150 bar
IsoSORP® flow
IsoSORP® static
-196°C -150°C -20°C 20°C 50°C 150°C 400°C
Cyro -
Cooling
Cold Gas
Cooling
Liquid
Circulator
Electrical
Heating
A main advantage of the Magnetic Suspension Balance is its wide working temperature
range. The IsoSORP® instruments can be operated in the sample temperature range
between -196°C and 400°C. Four devices are applied to cover this wide range: cyro-cooling
with LN 2 or LAr in a dewar vessel, cold gas cooling with N 2 , liquid thermostation and
electrical heating.
The metal measuring cell is always thermostated by one of these devices. Depending on
the temperature range of the measurement an appropriate device has to be located on
the cell. Even during a measurement the devices can be changed without causing any
change in the measuring fluid atmosphere. During the exchange the Magnetic Suspension
Balance can be set to the zero position. After changing the thermostating device the
measurement can be continued without baseline drift.
Cyro - Cooling Cold Gas Cooling Liquid Circulator Electrical Heating
Temperature Range
-196°C (LN 2 ) or -150°C … +20°C -20°C … +150°C +50°C … + 400°C
- 186°C (LAr)

IsoSORP® SERIES
GRAVIMETRIC SORPTION ANALYZERS
OPTIONS
Density Measurement
With the IsoSORP® instruments two samples can be weighed simultaneously.
Additionally to recording the mass change of the sample material a second – inert –
sample can be weighed. By weighing a Ti sinker as the second sample the density
of the gas phase in the balance is determined according to Archimedes’ principle.
Particularly at high pressures or in gas mixtures this cannot be calculated
accurately using equations of state.
The density influences the measured
sample mass, via the buoyancy effect,
and thus should be known accurately.
To Balance
Connection
Zero Point
Position
Sorption
Measurement
Density
Measurement
Furthermore, density measurement of
binary mixtures enables their composition
to be calculated without the necessity of
further composition analysis (e.g. by gas
chromatograph). Therefore, the IsoSORP®
offers two devices in one: gravimetric
measurement of mass transfer between a
gaseous fluid phase and the sample and
also the gravimetric measurement of gas
composition.
Electromagnet
Permanent
Magnet
Sinker
Example:
Simultaneous
Measurement
of Sorption
and Density
These options are available for
MSB type E1 and E10
Sample
To Balance
Connection
Electromagnet
Permanent
Magnet
Gas Flow in
Sample Container
set down to
sealed Support
Bypass Free Flow
of Gas through Sample
Sample Container with
“sieve like” bottom
Forced Flow through
Zero Point Position
Forced Flow Through
A special version of the IsoSORP® was developed to investigate mass transfer processes
in a forced flow of gas through bulk material beds. This apparatus is used to investigate
for example supercritical fluid extraction or reactions
Sorption
Measurement
on catalysts as close to the real process conditions
as possible.
The bulk material container is placed on a sealed plate
and the gas is forced to flow through the material.
The measurement of sample weight change due to
the mass transfer from or to the gas phase is carried
out over user configured time intervals.
The gas flow is stopped for a short time and the
container is lifted to a freely suspended state by the
Magnetic Suspension Balance and weighed. By this
procedure distinct weight data can be gained, each
after a certain time of gas flow through the sample.
Sample Container
lifted from Support
for weighing of
Sample
Gas Flow out

IsoSORP® SERIES
GRAVIMETRIC SORPTION ANALYZERS
BALANCE AND DOSING SYSTEM
A fully automatic IsoSORP® instrument is always a combination of the
Magnetic Suspension Balance and a gas and/or vapor dosing system.
This picture is just an example for a static or a flow system. The IsoSORP® instruments
are always a combination of the Magnetic Suspension Balance (MSB Type E1, shown
on the left side) and a dosing system (Type G-HP flow, shown on the right side).
To choose the right instrument for your application please select the resolution of the
balance and the dosing system in the table below.
Please choose a temperature range under “Temperature Control” in this brochure.
Magnetic
Suspension
Balance
FlexiDOSE
GAS AND/OR Vapor
DOSING SYSTEM
MSB + DOSING SYSTEM
FlexiDOSE Selection Matrix
Dosing System Pressure Range Media Atmosphere Special feature
G-LP STATIC up to 1 bar gas static UHV range
G-HP STATIC up to 150 bar gas static economic version
G-HPII STATIC up to 350 bar gas static metal block manifold
G&V-HP STATIC up to 150 bar gas &vapor static heated
SC-HPII STATIC up to 350 bar gas &vapor static supercritical fluids
Static dosing systems are pressure controllers
in which all valves are closed (i. e. no gas flow)
once the setpoint pressure is reached.
SC-HPIII STATIC up to 700 bar gas &vapor static extended P-range
G-MIX-HP STATIC up to 150 bar gas static mixed gas sorption
Dosing System Pressure Range Media Atmosphere Special feature
G-LP FLOW up to 1 bar gas flow UHV range
G-MP FLOW up to 50 bar gas flow economic version
G-HP FLOW up to 150 bar gas flow 2-stage P-controller
G-HPII FLOW up to 350 bar gas flow 2-stage P-controller
G&V-LP FLOW up to 1 bar gas &vapor flow airbath heated
G&V-MP FLOW up to 50 bar gas &vapor flow HPLC-pump dosing
Flow dosing systems are equipped with
a dynamically working upstream pressure
controller at the outlet of the balance
reactor. The pressure in the flowing
atmosphere is controlled by this setup.
G&V-HP FLOW up to 150 bar gas &vapor flow HPLC-pump dosing
G-MIX-MP FLOW up to 40 bar gas flow/static mixed gas sorption
G-MIX-HP FLOW up to 150 bar gas flow/static mixed gas sorption

IsoSORP® SERIES
GRAVIMETRIC SORPTION ANALYZERS
IsoSORP® Application Examples
Selected experimental results measured with the IsoSORP® series
in our customers’ laboratories are shown below.
High Pressure Adsorption Isotherm
High pressure gas adsorption isotherms are measured with our
IsoSORP® instruments.
In the diagram the adsorption isotherm data up to 500 bar of the
three gases CH 4 , N 2 , Ar on an activated carbon are shown.
Kinetics
In addition to the sorption capacity the reaction kinetics is an important
information to develop new materials. Due to their high accuracy and long
term stability the IsoSORP® instruments are an ideal tool to track dynamic
processes. In the diagram the uptake curves of H 2 on two different MOF
materials (metal organic framework) at 77 K and 298 K are compared.
From these time dependent uptakes effective diffusion coefficients can
be determined, which are characteristic for the adsorption kinetics.
Gas Cleaning and Separation
The IsoSORP® instruments are well designed to measure the selectivity of
ad- and absorption of gaseus mixtures on different materials.
The diagram shows the individual adsorption of the components of a gas
mixture in a ionic Liquid BMIM.
Adsorption Isotherms & Kinetics +++ Surface Area & Porosity +++ Absorption & Solubilities +++ Gas Storage
+++ Diffusion & Permeation +++ Separations +++ Wetting & Drying Processes +++ Corrosion Studies +++ Filter
Material Testing +++ Catalyst TESTING
RUBOTHERM GMBH
Konrad-Zuse-StrASSE 4 · 44801 Bochum · Germany
Phone: +49 (0)2 34 - 70 99 6 - 0 · Fax: +49 (0)2 34 - 70 99 6 -22
E-Mail: info@rubotherm.de · www.rubotherm.de
Technical data are subject to change without prior notice in line with continuous product improvement. © 2012 RUBOTHERM GMBH | Artwork: DesignBüro Schönfelder