Energy >Adsorption / Desorption Based on TGA
Gravimetric Sorption Analyzer - IsoSORP
Sorption Analyzer in combination with 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.
Unique features of the Magnetic Suspension Balances Technology - used in all IsoSORP Instruments
Contact free weighing under extreme conditions
The patented magnetic suspension coupling allows weighing in hermetically closed reactors. By separation of measurement area (sample) and weighing area (balance), damage or contamination of the balance caused by process media or experimental conditions can be avoided. The reactor is completely metal sealed and heated so that even highly aggressive or corrosive fluids or vapors can be used over 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 or recalibrate the balance. Afterwards, the sample is reconnected to the balance and the measurement continued. This way, high precision long term measurements can be performed without any baseline drift or accuracy loss.
Simultaneous density measurement
With IsoSORP instruments the sample weight and the density of the process fluid can be determined in a single measurement. This is achieved by weighing a titanium sinker as second inert sample.
The Magnetic Suspension Balance can be easily adapted to new applications. Existing instruments can be updated with many functional modules. A large number of custom configurations has already been realized.
The IsoSORP® instruments can be equipped with different versions of the Magnetic Suspension Balance with the following specifications:
Magnetic Suspension Balance Type
Dynamic Weighing Range (Sample Mass)
Application Examples for IsoSORP Sorption Analyzer
- Adsorption Isotherms and Kinetics
by Gas Physisorption and Chemisorption Measurements with Catalysts, Zeolites, Activated Carbon, Clay, Silica, Molecular Sieves
- Surface Area and Porosity
by Gas Physisorption, Density and Buoyancy Measurements with Catalysts, Zeolites, Activated Carbon, Clay, Silica, Molecular Sieves
- Absorption and Solubilities
by Gas Solubility Measurements in Polymers, Liquids and other Materials
- Gas Storage
Gas Storage Capacity Measurements with New and Classical Materials (Metal Organic Frameworks, Metal Hydrides, Carbon Nano Tubes, Ionic Liquids)
- Diffusion and Permeation
Measurements of Diffusion Coefficient of Ad- / Absorption Processes of Gases and Mixtures
Measurement of the Selectivity of Mixed Gas Sorption
- Temperature Programmed Desorption
Determining Binding Energies or Heat of Adsorption by Desorbing Loaded Sample Material at Elevated Temperature
Introduction of new application areas for TGA by measurements under high pressure or with aggressive fluids and vapors.
- Vapor Permeability and Diffusivity
Measurements of Membranes, Packing Materials, Blisters and Foils
- Wetting and Drying Processes
of Pharmaceuticals, Construction Materials and Solid Fuels
- Corrosion Studies
of Alloys for High Temperature Applications in Power Plants or Gas Turbines
- Filter Material Testing
by Measuring the Capacity and Selectivity for Pollutants
- Incineration or Conversion of Toxic
Biological and Chemical Materials by High Temperature and/or High Pressure Vapor
Sulphidation Processes, Coking and Lifetime Testing
- 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 (FlexiDOSE 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
Static dosing systems are pressure controllers in which all valves are closed (i. e. no gas flow) once the setpoint pressure is reached.
Dosing System Pressure Range Media Special feature G-LP STATIC up to 1 bar gas UHV range G-HP STATIC up to 150 bar gas economic version G-HPII STATIC up to 350 bar gas metal block manifold G&V-HP STATIC up to 150 bar gas & vapor heated SC-HPII STATIC up to 350 bar gas & vapor supercritical fluids SC-HPIII STATIC up to 700 bar gas & vapor extended P-range G-MIX-HP STATIC up to 150 bar gas mixed gas sorption
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.
Dosing System Pressure Range Media Special feature G-LP FLOW up to 1 bar gas UHV range G-MP FLOW up to 50 bar gas economic version G-HP FLOW up to 150 bar gas 2-stage P-controller G-HPII FLOW up to 350 bar gas 2-stage P-controller G&V-LP FLOW up to 1 bar gas & vapor airbath heated G&V-MP FLOW up to 50 bar gas & vapor HPLC-pump dosing G&V-HP FLOW up to 150 bar gas & vapor HPLC-pump dosing G-MIX-MP FLOW up to 40 bar gas mixed gas sorption G-MIX-HP FLOW up to 150 bar gas mixed gas sorption
- Temperature Control
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:
- cryo-cooling with LN2 or LAr in a dewar vessel,
- cold gas cooling with N2,
- 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.
Cryo - Cooling Cold Gas Cooling Liquid Circulator Electrical Heating Temperature Range -196°C (LN2 ) or -186°C (LAr) -150°C … +20°C -20°C … +150°C +50°C … +400°C