Ammonia (NH3) monitoring in ethylene polymerization

Ammonia content should be controlled and monitored in ethylene feeds to avoid catalyst damage during the polymerization of ethylene. Some chemical processing plants do not accept ethylene feedstock with an ammonia content higher than 1ppm. Ammonia monitoring at critical processing points prevents process downtime and expensive replacements/regeneration of catalyst.

Ethylene is an organic chemical refined from crude oil distillates. It is sold by refineries to chemical processors for polymerization to polyethylene, from which a variety of plastics are manufactured. Ammonia is usually present in ethylene streams in concentrations up to 1ppm and can contaminate the catalysts used in the polymerization process. When this occurs, the catalyst must be regenerated or replaced – a very expensive procedure in terms of time, chemicals and production losses due to process downtime.

To prevent catalyst contamination, a reliable, accurate measurement of ammonia content in ethylene is desirable and has become one of the ethylene purity checks used in assessing product quality. Chemical processing plants will not accept ethylene with ammonia concentration of 1ppm or higher. It must be diluted, scrubbed or otherwise removed by the refiner. CI Analytics provides ammonia gas detectors capable of monitoring ammonia and works to ensure your compliance with product quality standards.

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