The chitosan oligosaccharide and vanillin are used as raw materials to synthesize non-toxic and water-soluble chitosan oligosaccharide derivative called vanillin chitosan oligosaccharide as a green corrosion inhibitor...The chitosan oligosaccharide and vanillin are used as raw materials to synthesize non-toxic and water-soluble chitosan oligosaccharide derivative called vanillin chitosan oligosaccharide as a green corrosion inhibitor.The corrosion inhibition properties of 20#steel in CO_(2)-saturated solution system at 25°C and 3.5 wt%NaCl were studied.The synergistic effect of potassium iodide(KI)and VCOS on corrosion inhibition was also studied.Various techniques such as weight loss(WL),electrochemical analysis,atomic force microscopy(AFM),scanning electron microscopy(SEM),quantum chemical calculations,and molecular dynamics simulations were used to understand the inhibition properties.The inhibition efficiency of VCOS enhanced remarkably after the addition of KI,reaching an optimum value of 93.1%.EIS results showed that the inhibition of VCOS+KI on metal surface increased with time.Polarization measurements showed that VCOS and KI acted as mixed inhibitors by demonstrating anode dominance.SEM and AFM were used to study the formation of inhibition film on metal surface after 3 days immersion.We concluded that the mixed inhibitor followed Langmuir adsorption isotherm.In addition,quantum chemistry and molecular dynamics simulations were used to verify the relationship between corrosion inhibition efficiency and molecular structure.展开更多
As a potential resource for emerging clean energy with abundant reserves,coalbed methane(CBM)has risen rapidly in recent years,and the construction of rational and economical CBM gathering system plays a vital role in...As a potential resource for emerging clean energy with abundant reserves,coalbed methane(CBM)has risen rapidly in recent years,and the construction of rational and economical CBM gathering system plays a vital role in the development of the oil and gas industry.At present,there is no literature that considers the optimization of the multi-gathering mode of coalbed methane pipe network system.Due to the complexity and high investment,this paper establishes a unified mixed-integer nonlinear programming model to determine the gathering modes(including liquified natural gas,compressed natural gas,and gas gathering station)of gathering system to reduce the cost of coalbed methane collection and export.The objective function is the maximization of total profit during the period of the whole project,and such constraints,like network structure,facility number,location,node flow balance,capacity and variable value,are taken into consideration.The solution strategy and heuristic algorithm is proposed and verified by the field data from Shanxi province(China).The results show that the model can solve the problem for optimization design of the surface system in complicated CBM fields.展开更多
文摘The chitosan oligosaccharide and vanillin are used as raw materials to synthesize non-toxic and water-soluble chitosan oligosaccharide derivative called vanillin chitosan oligosaccharide as a green corrosion inhibitor.The corrosion inhibition properties of 20#steel in CO_(2)-saturated solution system at 25°C and 3.5 wt%NaCl were studied.The synergistic effect of potassium iodide(KI)and VCOS on corrosion inhibition was also studied.Various techniques such as weight loss(WL),electrochemical analysis,atomic force microscopy(AFM),scanning electron microscopy(SEM),quantum chemical calculations,and molecular dynamics simulations were used to understand the inhibition properties.The inhibition efficiency of VCOS enhanced remarkably after the addition of KI,reaching an optimum value of 93.1%.EIS results showed that the inhibition of VCOS+KI on metal surface increased with time.Polarization measurements showed that VCOS and KI acted as mixed inhibitors by demonstrating anode dominance.SEM and AFM were used to study the formation of inhibition film on metal surface after 3 days immersion.We concluded that the mixed inhibitor followed Langmuir adsorption isotherm.In addition,quantum chemistry and molecular dynamics simulations were used to verify the relationship between corrosion inhibition efficiency and molecular structure.
基金This work was part of the program“Study on the optimization method and architecture of oil and gas pipeline network design in discrete space and network space”,funded by the National Natural Science Foundation of China,grant number 51704253.
文摘As a potential resource for emerging clean energy with abundant reserves,coalbed methane(CBM)has risen rapidly in recent years,and the construction of rational and economical CBM gathering system plays a vital role in the development of the oil and gas industry.At present,there is no literature that considers the optimization of the multi-gathering mode of coalbed methane pipe network system.Due to the complexity and high investment,this paper establishes a unified mixed-integer nonlinear programming model to determine the gathering modes(including liquified natural gas,compressed natural gas,and gas gathering station)of gathering system to reduce the cost of coalbed methane collection and export.The objective function is the maximization of total profit during the period of the whole project,and such constraints,like network structure,facility number,location,node flow balance,capacity and variable value,are taken into consideration.The solution strategy and heuristic algorithm is proposed and verified by the field data from Shanxi province(China).The results show that the model can solve the problem for optimization design of the surface system in complicated CBM fields.
