In Association with: Biotechna Inc. USA - W. H. Capper (UK) Ltd are the only approved manufacturers of Contactors, worldwide. This is achieved by the provision of all process technology by BIOTECHNA Inc., USA for any application of the "Graesser" Contactor or “rotors”. The Complete mechanical design thereon is provided by WIDNES ENGINEERING (BUSCHING) Ltd, who have been involved with these units since their inception by Mr John Coleby of R. Graesser Ltd over 50 years ago, and have been actively involved in progressive development thereon to meet customer's requirements.
The success of this principle lies in the gentle and repeated dispersion and simultaneous coalescence of the two phases in each, and that this happens at right angles to the main con- or counter-current flow along the length of the machine.This avoids the violent mixing or pumping action associated with most other mixer/settlers and mechanical columns.
It also provides excellent compartment segregation with the minimum of back mixing:- unlike that found in static, mechanical or pulsating type columns.
With low maintenance becoming an ever increasing demand on the modern plant, Contactors excel in this area with up to 95% availability (5% down time) during its lifetime. With some processes up to 97% efficiency has been known. This is a proven technology developed over years with many units still in operation worldwide, for a number of decades. With an impressive track record for reliability & maintainability, the Contactor is more than a match for conventional methods of separation such packed towers.
- Suitable for many liquid/liquid/suspension, or solid applications, where slurries of up to 60% solids have been accommodated by solvent extraction & similar mass transfer operations.
- With its multi-stage performance in one single unit of equipment, it is both economical in operation and offers a considerable saving in valuable plant space.
- Very low power consumption makes for extremely low operating low operating costs.
- Maintenance & supervision costs are minimal when in operation.
- High flexibility gives little cause for concern should spasms of solute feed occur.
- Easy modernisation of existing old technology plants are readily achievable.
- Initial competitive cost compared to other methods ensures lower capital outlay with a rapid recovery of investment.
- Being environmentally protective, spent process liquors may be re-cycled in many cases into re-usable states, giving economy, reduced emissions and elimination/disposal of difficult materials, having a positive impact on the environment