Greenhouse gas (GHG) emissions from oil and gas systems are an important component of the GHG emission inventory. To assess the carbon emissions from oilfield-produced water under atmospheric conditions correctly, in situ detection and simulation experiments were developed to study the natural release of GHG into the atmosphere in the Shengli Oilfield, the second largest oilfield in China. The ...

We incorporate CO2 dissolution due to convective mixing into a sharp-interface mathematical model for the post-injection migration of a plume of CO2 in a saline aquifer. The model captures CO2 migration due to groundwater flow and aquifer slope, as well as residual trapping and dissolution. We also account for the tongued shape of the plume at the end of the injection period. We solve the model...

Haematoccocus pluvialis is the main natural source of astaxanthin. Extraction with SuperCritical (SC) carbon dioxide (CO2) is an interesting choice for astaxanthin recovery because the medium-to-high yield, high selectivity for high-value compounds, and avoidance of thermal damage to labile bioactive compounds. In the case of heavy and/polar compounds such as astaxanthin, yield can be increased...

Acetylation of plant metabolites fundamentally changes their volatility, solubility and activity as semiochemicals. Here we present a new technique termed dynamic (13) C-pulse chasing to track the fate of C1-3 carbon atoms of pyruvate into the biosynthesis and emission of methyl acetate (MA) and CO2 . (13) C-labelling of MA and CO2 branch emissions respond within minutes to changes in (13) C-po...

We discussed here on a novel approach to recycle CO2 back to liquid fuels by using nanostructured carbon-based materials (doped with suitable metal nanoparticles) as electrocatalysts. This approach is based on the development of a new photo-electrocatalytic (PEC) reactor, working in gas phase, which is quite different from the conventional reactors that operate typically in aqueous slurry and/o...

The aim of this work was to develop new process for extracting and separating hydrophilic and hydrophobic compounds from coffee beans using supercritical CO2 in water. In this work, experiments and simulation of the process has been conducted. Chlorogenic acid and caffeine from coffee beans were used as model compounds of hydrophilic and hydrophobic compounds, respectively. Experiment was condu...

Introduction The rapid increase in atmospheric carbon dioxide (CO2) levels has stimulated a growing interest in understanding biogeochemical processes in the ocean and their interactions with the atmosphere. Interestingly, surface CO2 is also reported to be rising at the Joint Global Ocean Flux Study (JGOFS) ocean time series sites off Hawaii and Bermuda. Potential effects of rising CO~ levels ...

Protonation and carbamate formation are critical reactions for CO2 capture using amine-based absorbents which impact both absorption amine regeneration. In this regard, thermodynamic analysis towards in N-methylaminoethanol solution is carried out with specific attention to the corresponding protonation reactions. The mechanism investigated acquisition of reaction equilibrium constant heat reac...

A case study of cerussite-dominated mine tailings (5-7 wt% Pb) from the former lead-zinc Grogwynion Mine, Mid Wales (UK), is presented with the objective of providing an improved understanding of the chemical speciation that controls element release from the waste in the short and long term. An experimental and modelling approach was used to examine the effects of pH changes in fresh waters int...