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Conference Presentations - 2011 AIChE Spring Meeting and Global Congress on Process Safety

A New Class of Polymer Inhibitors

Mar 16, 2011
P. N. Ramaswamy
Polymer inhibitors are used within an ethylene plant in locations which are susceptible to aggressive polymer formation i.e. Primary Fractionator, Compressors, Pyrolysis Gasoline Strippers and within the Gas Separation units. Over the years, the use of such additives has been extended to newer...

Improved Ethylene Cracking Furnace Control with Modern Process Mass Spectrometers

Mar 16, 2011
Peter J. Traynor
Whereas process mass spectrometers have been used as an alternative (lower cost) solution to multiple process gas chromatograph installations for many years, their use has been somewhat limited by their complexity - both real and perceived. The latest generation of process mass spectrometers has...

Loss of Downcomer Seal on a Depropanizer During a Plant Start up

Mar 16, 2011
Andre Bernard
The bottom C4’s product specification could not be met on the Depropanizer tower during a plant start up. The olefins unit had been started with a new start up procedure, which involved significant reduction in feed rates to the unit until achieving on spec ethylene. C3 & C4’s product were to...

Practices to Mitigate NOx Risk In Cryogenic Section of Ethylene Plants

Mar 15, 2011
Jennifer L. Bancroft
In May 2010 the Ethylene Producers Committee NOx Safety Sub-Committee sponsored a discussion on practices to mitigate NOx risk in the cryogenic section of ethylene plants. The meeting was attended by representatives of 10 ethylene producers, 4 ethylene contractors and other contractors, 2 additive...

LNG Tank Top Fires

Mar 15, 2011
James Venart
The regulatory requirements of 49 CFR 193, Liquefied Natural Gas Facilities: Federal Safety Standards, require thorough engineering reviews before approval of any proposed LNG facility. Such a process must consider potential and credible hazardous events. The proposed paper will specifically note,...

Inferential Monitoring & Optimization of Crude Units Via Hybrid Models

Mar 15, 2011
Vladimir Mahalec
Refinery crude units often process variety of feedstocks. If properties of the feed entering the crude unit are not precisely known, it is difficult to predict how changes in the tower operating conditions will affect properties of the products. Similarly, if on-line analyzers are not available, it...

Ethylene Boil-off Compressor Process Safety Incident

Mar 15, 2011
Niara Eckhard Uhlein
Braskem, a Brazilian player among petrochemical manufacturers, produces monomers, resins and chemicals specialties. The overall Ethylene capacity is 3,600 KTA, distributed in six Olefins plants. Naphtha is the main raw material of the petrochemical and plastic productive chain in Brazil, followed...

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