AsH3, Arsine Analyzer
Even at low ppb levels, arsine can adversely affect certain polymerization catalyst properties and also lead to polymer contamination. Detection of arsine in ethylene, propylene, or 1,3-butadiene is very difficult at the desired 5 ppb level. Even the most experienced chemists experience difficulty in positively identifying and accurately quantifying low (1-10 ppb) levels of this impurity. It is at this point that the time-proven analytical technique of Dry Colorimetry draws new attention. The application of the dry colorimetric technique to the measurement of trace arsine in the hydrocarbon streams has been independently demonstrated by several petroleum/petrochemical companies.
Arsine (AsH3) Monitoring in Propylene Polymerization
Propylene is an organic chemical refined from crude oil distillates. It is sold by refineries to chemical processors for polymerization to polypropylene, from which a variety of plastics are manufactured. Arsine (AsH3) is usually present in the propylene streams in concentrations up to 50 ppb (parts per billion), 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 avoid catalyst contamination, a reliable, accurate measurement of arsine content in propylene is desirable and has become of the propylene purity checks used in assessing product quality. Chemical processing plants will not accept propylene with an arsine concentration of 50 ppb or higher; the arsine must be diluted, scrubbed or otherwise removed by the refiner. C.I. Analytics provides analyzers capable of monitoring arsine and helps to verify the quality of your product.