What is the reason behind the addition of impurities. during electrolysis
process ?
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impurity is any component of a drug substance (excluding water) that is not chemical entity defined as drug substance[2]. ... The impurities present in the substance may be toxic, may change physical or chemical properties of the substance, thus making it medicinally useless.
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The behaviour of phosphorus and silicon in industrial aluminium cells was measured in QATALUM cells by analysis of bath and metal after addition of AlPO4, Na3PO4 and SiO2 to the bath.
Phosphorus showed a much longer retention time in the bath than silicon. Start-up and anode effects influence the phosphorus and silicon level in the cells. Data trends showed that the amount of phosphorus decreases with increasing temperature.
The effect of phosphorus on current efficiency was determined by measuring the metal inventory by copper dilution. The results were compared with current efficiencies estimated from measuring sodium concentration in the produced aluminium.
The mass transfer coefficient for silicon was determined to be 3.1 × 10-5 m/s. Mass balance for phosphorus was carried out.
It was found that massive amounts of phosphorus entering the cells were transported with the off-gases to the dry scrubbers
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