April 2006

Process Optimization

Prevent system hydrate formation during sudden depressurization

Using this technique can help size gas plant inhibitor packages

Asadi Zeydabadi, B., Haghshenas, M., Namvaran Management and Engineering; Moshfeghian, M., Shiraz University; Roshani, S., Petrochemical Industries Design & Engineering Co., PIDEC

A hydrate is a physical combination of water (H2O) and other small molecules producing a solid, which has an ice-like appearance but possesses a different molecular structure. Formation in gas and/or natural gas liquid (NGL) systems can plug pipelines, equipment and instruments, and restrict or interrupt flows. There are three crystalline structures for hydrates. In each, H2O molecules – host molecules – build the lattice, and hydrocarbons, nitrogen (N2), xenon (Xe), argon (Ar), carbon dioxide (CO2) and hydrogen sulfide (H2S) – guest molecules – occupy the cavities. Smaller molecules such as methane (CH4), ethane (C2H6), CO2 and H2S stabilize the body-centered cubic calle

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