نمایش همه 3 نتیجه
Phase equilibrium measurements for hydrates of the CH4 /CO2 / 1, 4-Dioxane aqueous solution system
The equilibrium compرایگان!
The equilibrium compositions and properties of CO2/CH4/1,4-dioxane/water hydrate were studied for the first time at temperatures ranging from 273.65 to 281.35K and pressures ranging from 0.5 to 1.1MPa. The gas mixture consist of about 45% CO2 was used to be an exemplary for biogas and landfill gas operations. Equilibrium hydrate formation conditions for above system were measured. 1,4-Dioxane lowered equilibrium pressure by 2MPa comparing with pure water at some temperatures. This is an indication that structural transition from SI to SII was occurred
Processes and apparatuses for formation, separation and pelletizing of gas hydrate
Despite the suggesteرایگان!
Despite the suggested applications for gas hydrate in transportation and storage of natural gas, desalination of water, etc., there has been no applied industrial application for it. There are several patents and papers on thermodynamically and kinetically promotion of gas hydrate formation and many concerning its related processes. In designing a process based on gas hydrate application in industry, one must include the following operations: formation, separation, pelletizing, storage, transportation and gasification. In this review, operations of each gas hydrate’s application are studied and processes for formation, separation and pelletizing of gas hydrate are widely discussed. Gas hydrates formation systems are classified based on contact type of gas and liquid. Autoclave, spray, bubble column, using micro bubbles, hydrate formation with emphasis on nucleation sites and gas ice process are discussed as hydrate formation systems. Separation of gas hydrate and unreacted water is a solid-liquid separation process which is done by operations based on density difference (using gravity force or centrifugal force) or mechanical separation such as filtration. Pelletizing of gas hydrate with more storage gas capacity and less decomposing rate has been accomplished by piston and cylinder or roller systems
The Effective Parameters of Hydrate Formation in the Presence of Porous Media
Generally, the interرایگان!
Generally, the interest on the utilization of porous media in hydrate formation is mainly due to its natural occurrence in the ocean depths. The hydrate formation is potentially influenced by temperature, pressure, salinity, gas composition and interfacial surface area which can be affected by the presence of porous media. The effects of different types of porous media such as silica, activated carbon, carbon nanotube and silica gel on hydrate formation are considerable depending on the specific area, pore volume and pore size distribution. The presence of porous media in methane hydrate formation could affect the rate of hydrate formation and the amount of gas encaged in the hydrate phase. The mentioned parameters are important in selective gas separation utilizing hydrate technology. In this study, the effect of the presence of porous media on hydrate formation technology was investigated. The aim was to provide a guide to future development in selecting suitable porous media in hydrate formation for gas purification and gas storage as an energy saving method