|Structure and properties|
|SGS-Typs and their application|
|see also: Investigated fields of application|
The polymers of spatial globular structure are processed in a polymerisation or polycondensation process respectively. The monomers used are, e.g. styrene, vinyle pyridine, methyl methacrylate, phenols, amines, melamines and epoxides.
A new production principle provides new porous materials with properties known from ion exchange resins and adsorber materials.The formation process of these porous and compact materials is conformable to the polymerisation and polycondensation processes.
The reactions causing the formation of a three-dimensional polymer structure procced simultaneously to processes causing the formation of polymer products in form of colloid-dispersed systems.
The shape of the
solids can already be fixed in advance during the production process by
using a manufacturing vessel corresponding to the required shape. The shape
can also be finished by a mechanical treatment (e.g. by sawing, cutting,
drilling, milling and grinding) of polymer solids after the production
process. For example plates, cylinders and bars can be manufactured in
If necessary the polymers can be stabilised by metal or plastic carcasses.
are more suitable for technical applications comparing to conventional
technologies using ion-exchangers. The column technology is replaced by
filter cartridges which hang free in the liquid. The cartridges might be
screwed or combined in any way to allow a modular technology.
Various types of SGS-Polymers (0.6 l cartridges)
The SGS-polymers have a regular and highly porous structure. This structure is formed by microglobules, which are chemical linked to each other at their contact points. The size of the microglobules ranges between 0.003 µm and 15 µm in dependence on the production conditions. The microcavities between the microglobules represent the pores. The pore size range between 0.001 µm and 10 µm and can selectively be influenced by the synthesis conditions. The functional groups are located on the surface of the microglobules. The amount of functional groups varies between 2 and 14 mval/g.
According to the
monomers and their amounts used in the polymersation and polycondensation
process, respectively, the produced filter materials show adsorbing, ion
exchanging, deimulsifying, reducing and complexing properties.
The structure is characterised by the following parameters:
The rate of sorption in conventional (regular) ion exchangers and adsorbents is limited by particle-diffusion. But in SGS-polymers the rate of sorption is limited by film-diffusion. High throughputs reduce the thickness of the hydrodynamic layer on the surface of the adsorbent particles. The reduction of the layer thickness effects a higher rate of sorption. Therefore SGS-polymers especially work efficiently if high throughputs are realised.
The applicable flow rate ranges up to 3000 bed volumes per hour, i.e. a cartridge with a volume of 1 litre has a throughput of up to 3000 litres water per hour. Therefore, SGS-Polymers are many times more efficient than conventional (granular) resins.
A large number
of SGS-polymers for various application fields can be manufactured according
to the different base materials and conditions of synthesis.
About 20 different SGS-polymers have been developed till now. Currently, a number of eight of these polymers are commercially available. The following table gives some information about the structure and application fields of the commercially available SGS-polymers.
and Application fields of the commercially available SGS-polymers
|Type||Structure unit||Monomers||Sorbable Substances||Application fields|
|SGS-7||phenol, benzyl alcohol||thallium,
nic compounds of high and medium polarity, dye-
stuffs, phenols, pesticides, floating agents
|filtration, microfiltration (pH<9.5), sorption and coalescence separation of the left mentioned substances|
|SGS-8||resorcin||thallium, lead, organic compounds||filtration of
neutral and acidic suspensions, coalescence separation, drinking water
|SGS-10||carbamide||hydrophilic organic compounds||filtration, coalescence separation, sorption of floating agents|
|arsenic, antimony, bismuth, molybdenum, tungsten, organic compounds||filtration of acidic suspensions, removal of arsenic and bismuth from wash acids, removal of arsenic and antimony from copper electrolyte solutions|
|SGS-15||melamine||anions, molybdenum, tungsten||microfiltration of strong basic and strong acidic (including HNO3) suspensions, extraction of Mo from waste water, removal of surplus acid from waste water|
|SGS-80||resorcylic acid||cations of water hardness salts, zinc, cadmium, lead, copper, silver||wastefree water softening, removal of non-ferrous metal cations from waste water|
nic compounds, lanthanides, zinc, cadmium, lead, copper, silver
|removal of phenols from waste water, removal of non-ferrous metal cations from waste water|
|SGS-110||o-quinone||germanium||germanium extraction from aqueous solutions of complicated composition|
The Utt Ltd possesses the European exclusive rights for the selling and marketing of the SGS-polymers.
Currently, the Utt Ltd
offers SGS-polymer types 7, 8, 10, 11, 15 and 80 as
- laboratory cartridge (30 ml)
- and technical cartridge (0.4 - 0.9 l).
The technical cartridges
have threads both at the top and at the bottom. In that way the cartridges
can be screwed together in order to form large filter elements.
Furthermore, any other shapes, e.g. plates, bars and cubes, but also more complicated geometric shapes, can be supplied.
You can send an order for
information material and a new price list to the e-mail
Mrs Dr. Eleonora Petersohn gives you with pleasure more information about the SGS-polymers and the current offer of the Utt Ltd. She looks forward to answer your questions concerning the SGS-polymers, too.
Steffen Bock Weiland and Roland Kühne