Progressive 18O depletion during CO2 separation from a carbon dioxide-rich hydrothermal fluid: evidence from the Grey River tungsten deposit, Newfoundland: Discussion

1985 ◽  
Vol 22 (9) ◽  
pp. 1380-1381
Author(s):  
Peter Blattner
Keyword(s):  
Carbon Dioxide ◽  
Hydrothermal Fluid ◽  
Co2 Separation ◽  
Tungsten Deposit

Progressive 18O depletion during CO2 separation from a carbon dioxide-rich hydrothermal fluid: evidence from the Grey River tungsten deposit, Newfoundland

1982 ◽  
Vol 19 (12) ◽  
pp. 2247-2257 ◽  
Author(s):  
N. C. Higgins ◽  
R. Kerrich
Keyword(s):  
Hydrothermal Fluid ◽  
Chemical Change ◽  
Co2 Separation ◽  
Tungsten Deposit ◽  
Magmatic Origin ◽  
Low Salinity ◽  
Oxygen Isotopic ◽  
Retrograde Boiling ◽  
Fractionation Factors ◽  
Tungsten Deposits

Oxygen isotope data for the Grey River tungsten prospect, Newfoundland, Canada, indicate a progressive depletion in δ18Ofluid during mineralization. Early veins with pegmatitic affinities were deposited at 470 °C and pressures greater than 1 kbar (100 MPa), from a fluid with a δ18O composition of 7.4‰, presumed to be of magmatic origin. Successive vein deposition, at progressively lower temperatures and pressures, culminated in the precipitation of wolframite-bearing veins at a temperature of 300 °C and pressures of 150–320 bar (15–32 MPa), from a low salinity fluid with a δ18O composition in the range 3.2–1.6‰.Low values of δ18O (and δDfluid) are recorded in many vein tungsten deposits and are normally interpreted as reflecting mixing of isotopically light meteoric fluids or formation brines with magmatic fluids. However, fluid-inclusion evidence for the Grey River mineralization indicates that a 40 mol% CO2 loss occurred by immiscibility and retrograde boiling of the hydrothermal fluid between 420 and 300 °C. Such a chemical change would have significantly altered the oxygen isotopic character of the hydrothermal fluid since CO2 fractionates 18O relative to coexisting water by ~10‰ at 400 °C and ~14‰ at 300 °C. Calculations using available CO2–H2O fractionation factors reveal that up to a 7‰ depletion in δ18O of the residual aqueous fluids may occur as a result of the 40 mol% CO2 loss from the hydrothermal fluid.

HYDROTHERMAL MODELING OF SECONDARY RESERVOIR FORMATI ON IN SILICEOUS LIMESTONS (H2O–CO2 SYSTEM)

2020 ◽  
pp. 43-58
Author(s):  
M. Yu. Zubkov ◽  
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Amorphous Silica ◽  
Hydrothermal Fluid ◽  
West Siberia ◽  
Hydrothermal Conditions ◽  
Secondary Porosity ◽  
First Results ◽  
Siliceous Limestone ◽  
First Time

We have discussed the first results of hydrothermal modeling of the formation of secondary reservoirs (hydrothermal silicites) in siliceous limestones, which are widespread in the Pre-Jurassic complex of West Siberia, namely, in the H2O-CO2 system, in which the mole fraction of CO2 varied from 0.0 to 1.0, and the temperature from 215 to 410оС. It has been found that in this system there is a predominant dissolution of carbonates and, first of all, dolomite, as a result of which the surface of siliceous limestone is silicified and secondary porosity is formed in them. In some samples, quartz microcrystals with varying degrees of perfection of crystal faceting are shaped. It is found that pyrite is also unstable under these hydrothermal conditions and decomposes forming iron-containing carbonates at its sacrifice. Its transformation into pyrrhotite and copper and nickel sulfides is also observed. Biogenic quartz dissolved by a hydrothermal fluid is released from it either in the form of microcrystalline quartz, or in the form of quenching phases represented by cristobalite and/or amorphous silica. It is also found that at temperatures above 360°C, instead of iron-containing carbonates, chlorite is formed due to pyrite, while kaolinite also decomposes along with pyrite. It was experimentally established for the first time that at a high temperature (410°C), carbon dioxide acquires oxidizing properties and, as a result of its interaction with copper, oxide and red oxide of copper are formed. In addition, under these conditions, pyrite passes into iron-containing carbonates rather than chlorite. The main regularities of the formation of secondary reservoirs, i. e. hydrothermal silicites, in the Paleozoic siliceous limestone have been revealed.

Spectroscopic analysis of carbon dioxide and nitrogen mixed gas hydrates in silica gel for CO2 separation

2006 ◽  
Vol 115 (1-4) ◽  
pp. 279-282 ◽  
Author(s):  
Jeasung Park ◽  
Yu-Taek Seo ◽  
Jong-won Lee ◽  
Huen Lee
Keyword(s):  
Carbon Dioxide ◽  
Silica Gel ◽  
Gas Hydrates ◽  
Spectroscopic Analysis ◽  
Co2 Separation ◽  
Mixed Gas

scholarly journals The Fight to Overcoming Greenhouse Effect for Anti Global Climate Change and Current Situation

2018 ◽  
Vol 1 (1) ◽  
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Greenhouse Effect ◽  
Industrial Processes ◽  
Co2 Separation ◽  
Industrial Equipment ◽  
Industrial Emissions ◽  
Exhaust Gases ◽  
Industrial Exhaust ◽  
New Generation

The greenhouse effect is caused by CO2 released from various industrial and agricultural sources. Now assumed that, If we treat about 50% of the global greenhouse emission gases, global warming is considered to be remedied, while half of the total greenhouse gas emissions are nearly equal to the total emissions of greenhouse gases. From all thermal power plants. So if we treat all the exhaust gases from all thermal plants, global warming is considered to be remedied. So far, the greenhouse effects have not been treated yet. In our opinion, There are four reasons for this situation, that is: 1- We do not have a new generation of suitable industrial equipment and no suitable technologies 2- .We cannot remove the dust thoroughly before CO2 separation from the exhaust gases. 3- We have used ethanolamine to CO2 separation from industrial emissions, 4-We do not have the suitable solution to bury CO2 on the ocean floor. The authors of this project have overcome all the disadvantages mentioned above by proposing new generation of suitable new equipment as well as proposing new no-waste technologies suitable for treatment and reusing industrial exhaust gas as well as CO2 separation out of it, proposed using a cheap solvent called soda instead of ethanolamine to remove carbon dioxide from industrial emissions, suggests two inexpensive solutions to bury carbon dioxide in the ocean floor. The author has designed some major industrial equipment with a sufficiently large scale to handle industrial emissions of 3.4 million m3 per hour from a fossil fuel-fired 1,000MW plant. Industrial processes from very costly processes have many unreasonable steps have turned into less expensive industrial processes, even profitable. Content of the project is represented by 27 exclusive patents VN, 23 of these inventions were participated in the international invention innovation competition in Toronto Canada in 2017, and all 23 proposals are awarded with 15 gold medals and 8 silver medals. The project concludes with the following conclusions: 1. Conclusion on the generation of the suitable new equipment. 2. Conclusion on the suitable new technologies. 3. Conclusion on the two stages for the treatment of industrial exhaust gases. 4. Conclusion on the CO2 separation from the industrial emissions and CO2 transportation storage. 5. Conclusion on the CO2 storing on the deep ocean. 6. Conclusion on the economic efficiency. 7. General conclusion.

scholarly journals Recent Advances in Molten-Carbonate Membranes for Carbon Dioxide Separation: Focus on Material Selection, Geometry, and Surface Modification

2021 ◽  
Vol 2021 ◽  
pp. 1-22
Author(s):  
Shabana Afzal ◽  
Atif Khan
Keyword(s):  
Carbon Dioxide ◽  
Molten Salt ◽  
Material Selection ◽  
Ceramic Membranes ◽  
Co2 Separation ◽  
Molten Carbonate ◽  
Carbon Dioxide Transport ◽  
Carbon Dioxide Separation ◽  
Support Materials ◽  
Separation Membranes

Membranes for carbon dioxide permeation have been recognized as potential candidates for CO2 separation technology, particularly in the energy sector. Supported molten-salt membranes provide ionic routes to facilitate carbon dioxide transport across the membrane, permit the use of membrane at higher temperature, and offer selectivity based on ionic affinity of targeted compound. In this review, molten-carbonate ceramic membranes have been evaluated for CO2 separation. Various research studies regarding mechanisms of permeation, properties of molten salt, significance of material selection, geometry of support materials, and surface modifications have been assessed with reference to membrane stabilities and operational flux rates. In addition, the outcomes of permeation experiments, stability tests, selection of the compatible materials, and the role of interfacial reactions for membrane degradation have also been discussed. At the end, major challenges and possible solutions are highlighted along with future recommendations for fabricating efficient carbon dioxide separation membranes.

Block copolymer membranes based on polyetheramine and methyl-containing polyisophthalamides designed for efficient CO2 separation

2017 ◽  
Vol 30 (9) ◽  
pp. 1064-1074 ◽  
Author(s):  
Xin Fu ◽  
Xueqin Li ◽  
Ruili Guo ◽  
Jianshu Zhang ◽  
Xingzhong Cao
Keyword(s):  
Carbon Dioxide ◽  
Block Copolymer ◽  
Ethylene Oxide ◽  
Free Volume ◽  
Gas Mixtures ◽  
Co2 Separation ◽  
Separation Performance ◽  
Mass Ratio ◽  
Fractional Free Volume ◽  
Diphenyl Sulfone

A series of block copolymer membranes was designed using polyetheramine (PEA) and methyl-containing polyisophthalamides (MPA) for the separation of carbon dioxide (CO2)/methane (CH4) gas mixtures. PEA consists of abundant ethylene oxide units, which show good affinity with CO2, and MPA consists of methyl (Me) substituents, which can increase the fractional free volume of block copolymer membranes. The Me substituents were introduced into MPA via polymerization from isophthaloyl dichloride (IPC), 2,5-dimethyl-1,4-phenylenediamine (DPD), and 4,4′-bis(3-aminophenoxy)diphenyl sulfone (BADS). Therefore, the CO2 solubility and diffusivity in the membranes could be improved by tailoring the PEA/MPA mass ratio and BADS/DPD mole ratio, respectively. The membrane with a PEA/MPA mass ratio of 6/4 and a BADS/DPD mole ratio of 1/10 exhibited optimum CO2 separation performance with a CO2 permeability of 629 Barrer and CO2/CH4 selectivity of 23 at 2 × 105 Pa and 25°C.

scholarly journals Zeolites and related sorbents with narrow pores for CO2 separation from flue gas

RSC Advances ◽  
2014 ◽  
Vol 4 (28) ◽  
pp. 14480-14494 ◽  
Author(s):  
Ocean Cheung ◽  
Niklas Hedin
Keyword(s):  
Carbon Dioxide ◽  
Flue Gas ◽  
Co2 Separation ◽  
Emission Sources

Adsorbents with small pores are especially relevant for capturing carbon dioxide at large emission sources.

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