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...

Trip & Throttle Valve Reliability

Mar 15, 2011
Joan del Castillo
Trip & Throttle Valve Reliability Trip & Throttle (or Stop) valves are used in ethylene plants to isolate the energy to steam turbines when required. They are critical Safety Protection components with a high impact on a plant’s reliability; however, they operate under tough conditions like...

Flare Minimization Via Dynamic Simulation

Mar 15, 2011
Kuyen Li
Flaring in chemical process industry (CPI) is an important method to protect equipment and personnel safety during the process upset and the chemical plant turnaround. However, excessive flaring emits lots of carbon dioxide as well as air pollutants, which cause negative environmental and social...

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...

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