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Home > Forums > Chemical Engineers > Materials > Membrane engineering Forum

Silica contamination

thread136-36162
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aspearin1 (Chemical)
8 Nov 02 17:38
Is there a strong affinity for SiO2 (weakly negative) to bind to Primary amines?  Or Quaternary amines? More specifically, on a high amine nylon membrane?  We're having a slight contamination issue, but we're not quite sure if it's an issue yet.
EMKWR (Chemical)
25 Nov 02 7:43
Membranes are known to suffer scaling effects. This could be the deposition of carbonates but in case of high SiO2-contents, silicates will do as well. There is no real connection with the material used for the membrane, the presence of a polyvalent cation (calcium, magnesium for example) will do. Have seen a great picture recently at the UPW Europe of a membrane which has doubled in weight because of the deposition of insoluable salts.
You should try the addition of some anti-scalant.

Edwin Muller
e.f.muller@kema.nl
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