gas hydrate formation in production and transmission pipelines and consequent plugging of these lines have been a major flow-assurance concern of the oil and gas industry for the last 75 years. gas hydrate formation rate is one of the most important topics related to the kinetics of the process of gas hydrate crystallization. the main purpose of this study is investigating phenomenon of gas hyd...

Most experiments show that gas hydrates are often enriched in C 2+ gases relative to the feeding source because of fractionation during hydrate crystallization directly from free and dissolved gases. However, sediments below near base stability zone (BGHSZ) many ocean drilling program (ODP)/International Ocean Discovery Program (IODP) sites relatively hydrocarbon gases, compared with hydrate-oc...

the process of ethylene production from ethane dehydrogenation is one of the interesting processes in the field of conversion the petroleum light gases to the valuable products. in this process, the outlet gaseous product is a combination of ethylene, ethane and hydrogen. effective separation techniques are required for separation of ethylene from unreacted ethane. here a new adsorbent approach...

In the title compound, [Cu(C(12)H(18)N(2)O(2))]·0.25H(2)O, the coordination of the O,N,N',O'-tetra-dentate ligand results in a cis-CuN(2)O(2) square-planar geometry for the metal ion and the presence of two six-membered and one five-membered chelate rings. The complete complex mol-ecule is close to planar (r.m.s. deviation = 0.047 Å). The uncoordinated water mol-ecule (O-atom site symmetry 2) w...

recently, due to the very good market in ethane as a feedstock for petrochemical complexes, thereare some plans to make a deep ethane recovery from the gases produced in iran southern fields. inthis work, the feasibility of different technologies for deep ethane recovery from a specified feed gasproduced in one of the iran southern fields is reviewed. three different processes are selected ands...

The effects of porous medium heterogeneity on methane hydrate formation, water flow through the heterogeneous hydrate-bearing sand, and hydrate dissociation were observed in an experiment using a heterogeneous sand column with prescribed heterogeneities. X-ray computed tomography (CT) was used to monitor saturation changes in water, gas, and hydrate during hydrate formation, water flow, and hyd...

Continuous Fractional Component Monte Carlo (CFCMC) and molecular dynamics (MD) simulations are performed to calculate the solubilities self-diffusion coefficients of four light n-alkanes (methane, ethane, propane, n-butane) in aqueous NaCl solutions as well thermodynamic properties their corresponding hydrate crystals. Correction factors kij Lorentz–Berthelot combining rules for alkane groups ...

When gas hydrates dissociate into and liquid water, many bubbles form in the water. The large disappear after several minutes due to their buoyancy, while a number of small (particularly sub-micron-order known as ultra-fine (UFBs)) remain water for long time. In our previous studies, we demonstrated that existence UFBs is major factor promoting hydrate formation. We then extended research on th...

The process of ethylene production from ethane dehydrogenation is one of the interesting processes in the field of conversion the petroleum light gases to the valuable products. In this process, the outlet gaseous product is a combination of ethylene, ethane and hydrogen. Effective separation techniques are required for separation of ethylene from unreacted ethane. Here a new adsorbent approach...

An isobaric flow loop added to the Gas Hydrate And Sediment Test Laboratory Instrument (GHASTLI) is being investigated as a means of rapidly forming methane hydrate in watersaturated sand from methane dissolved in water. Water circulates through a relatively warm source chamber, dissolving granular methane hydrate that was pre-made from seed ice, then enters a colder hydrate growth chamber wher...