(81d) TDLAS Analysis of NH3 in High-Purity Ethylene
AIChE Spring Meeting and Global Congress on Process Safety
2020
2020 Virtual Spring Meeting and 16th GCPS
The 32nd Ethylene Producers Conference
Ethylene Plant Operations II
Wednesday, August 19, 2020 - 3:00pm to 3:20pm
The subject of this paper is differential TDLAS, a highly selective and accurate technique for NH3 analysis in ethylene. TDLAS analyzers have an exceptionally fast response to changes in NH3 concentration, an important performance characteristic for monitoring ethylene purity at custody transfer points and in the feed streams to LDPE, LLDPE, and HDPE polymer plants. A differential technique will be described which enables detection and quantitation of subâppm levels of NH3 in ethylene. An integrated permeation tube will also be described which supports automated validation checks to verify the analyzer is operating properly during extended periods of time when NH3 is not present in an ethylene gas stream.
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