SGS-Polymers (Informations)

	Manufacture
	Structure and properties
	SGS-Typs and their application
	Marketing
	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 this way.
If necessary the polymers can be stabilised by metal or plastic carcasses.

Filter cartridges 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.
 
 

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 porous structure depends strongly on the synthesis conditions.
• The pore size distribution amounts to 10 %.
• The total pore volume reaches values of up to 2 ml/g.
• The inner surface area of SGS-polymers established by the pores amounts up to 500 m²/g.

 Photo of SGS-8 taken by scanning electronic microscopy

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.

Table: Structure and Application fields of the commercially available SGS-polymers
 

Type	Structure unit	Monomers	Sorbable Substances	Application fields
SGS-7		phenol, benzyl alcohol	thallium, orga- 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 purifi- cation
SGS-10		carbamide	hydrophilic organic compounds	filtration, coalescence separation, sorption of floating agents
SGS-11		o-dihydroxy- benzene	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
SGS-81		resorcin- sulphonic acid	hydrophilic orga- 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 address.
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.
 
 
 
 

 

Last Update: October 2001

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