Chemical process optimization can be described as large-scale nonlinear constrained minimization. The modified augmented Lagrange multiplier methods (MALMM) for large-scale nonlinear constrained minimization are studi...Chemical process optimization can be described as large-scale nonlinear constrained minimization. The modified augmented Lagrange multiplier methods (MALMM) for large-scale nonlinear constrained minimization are studied in this paper. The Lagrange function contains the penalty terms on equality and inequality constraints and the methods can be applied to solve a series of bound constrained sub-problems instead of a series of unconstrained sub-problems. The steps of the methods are examined in full detail. Numerical experiments are made for a variety of problems, from small to very large-scale, which show the stability and effectiveness of the methods in large-scale problems.展开更多
Boron doped diamond(BDD)performs well in electrochemical oxidation for organic pollutants thanks to its wide electrochemical window and superior chemical stability.We presented a method to obtain well-adherent large-s...Boron doped diamond(BDD)performs well in electrochemical oxidation for organic pollutants thanks to its wide electrochemical window and superior chemical stability.We presented a method to obtain well-adherent large-scale BDD/Nb electrode by the modified hot filament chemical vapor deposition system(HFCVD).SiC particles were sand blasted to enhance the adhesion of BDD coating.The BDD coating was then deposited on both sides of Nb which was placed vertically and closely with filament grids on both sides.The BDD/Nb electrodes had no deformation because the thermal deformations of the BDD films on both sides of the Nb substrate conteracted each other during cooling process after deposition.The surface morphology and purity of the BDD/Nb electrode were analyzed by Raman and scanning elestron microscope(SEM)techniques.Scratch test was used to investigate the adhesion of BDD films.The electrochemical performances were measured by cyclic voltammetry test.The BDD electrode at the B/C ratio of 2 000×10^(-6) held a higher oxygen evolution potential thanks to its high sp3 carbon content.Accelerated life test illustrated that the sandblasting pretreatment obviously enhanced the adhesion of BDD coating which resulted in a longer service duration than the un-sandblasted one.展开更多
2019 is the 70^th anniversary of the founding of the People’s Republic of China. In order to display and publicize the extraordinary achievements of China’s daily chemical industry in the past 70 years and tribute t...2019 is the 70^th anniversary of the founding of the People’s Republic of China. In order to display and publicize the extraordinary achievements of China’s daily chemical industry in the past 70 years and tribute to the 70th anniversary of China, China Research Institute of Daily Chemical Industry has planned and launched a selection campaign named “2019 Top 100 Daily Chemical Enterprises in China” among China’s daily chemical industry for the first time.展开更多
In view of the environmental and safety risks of hazardous chemical explosions in chemical enterprises,the fault tree analysis was used to establish a fault tree model of hazardous chemical explosions and comprehensiv...In view of the environmental and safety risks of hazardous chemical explosions in chemical enterprises,the fault tree analysis was used to establish a fault tree model of hazardous chemical explosions and comprehensively analyze the possibility of the explosions.The 34 basic events that caused hazardous chemical explosions were expounded,and the minimum cut and path sets were obtained.The structure importance of basic events were calculated.According to the minimum path sets,the basic events when the accident does not occur were determined,and combined with the sequence of structure importance,the preventive measures for hazardous chemical explosion accidents were proposed.The fault tree model intuitively clarified the correlation between the direct causes of hazardous chemical explosion accidents,and proposed directions for effectively reducing the probability of hazardous chemical explosion accidents in the chemical industry.展开更多
Guangdong Chengming Chemical S&T Co.,Ltd.,a modern high-tech papermaking chemical enterprise,specializes in the production and sales as well as providing technical services.CM Chemical has two production bases.Fol...Guangdong Chengming Chemical S&T Co.,Ltd.,a modern high-tech papermaking chemical enterprise,specializes in the production and sales as well as providing technical services.CM Chemical has two production bases.Following are the history of our company:2003Dongguan Longteng Industrial Co.,Ltd.,the first chemical base completed in 2003 with annual capacity of 100,000t/year2013Nantong Tenglong Chemical Technology Co.,Ltd.,the second chemical base completed in 2013 with annual capacity of280,000t/year.展开更多
Fe3 O4 has attracted tremendous interest in vast areas of biomedicine and catalysis as well as environment engineering.However,it is highly desired to fully understand the chemical kinetic process and propose a genera...Fe3 O4 has attracted tremendous interest in vast areas of biomedicine and catalysis as well as environment engineering.However,it is highly desired to fully understand the chemical kinetic process and propose a general,surfactantfree,large-scale synthesis approach for Fe3 O4 spheres.Herein,we developed a facile scalable solvothermal method in the absence of surfactants to produce Fe3 O4 spheres with the yield of 5.1 g,which present tunable sizes from 107 to 450 nm by modulated molar ratio of Fe3+/COO-in the solution.Particularly,it is observed that the reactants undergo a redox process,composed of a precipitation-dissolution equilibrium combined with a coordination reaction(termed as RPC),to the final product based on the LaMer model.It is worth noting that the generation of di-carboxyl group and its coordination with iron cations determine the formation of Fe3 O4 spheres.This work not only offers a strategy to precisely tailor the particle size in scalable synthesis process,but also gives the insight on the role of dihydric alcohol in the formation mechanism of Fe3 O4 spheres in the absence of surfactants.展开更多
Recently recommended by China Chemical Fibre Industry Association(CCFA),four companies of Jiangsu Shenghong Chemical Fibre Co.,Ltd.,Jiangsu Hengli Chemical Fibre Co.,Ltd.,Jiangsu Yingxiang Chemical Fibre Company Limit...Recently recommended by China Chemical Fibre Industry Association(CCFA),four companies of Jiangsu Shenghong Chemical Fibre Co.,Ltd.,Jiangsu Hengli Chemical Fibre Co.,Ltd.,Jiangsu Yingxiang Chemical Fibre Company Limited,Jiangsu Xinmin Technology Co.,Ltd.展开更多
In recent years,with China’s accelerated implementation of the'going out'strategy and promotion of the'Belt and Road'construction and development,Chinese enterprises have grown rapidly and achieved br...In recent years,with China’s accelerated implementation of the'going out'strategy and promotion of the'Belt and Road'construction and development,Chinese enterprises have grown rapidly and achieved breakthroughs in terms of overseas investment in copper industries and overseas development of copper resources that are in short supply in China.展开更多
文摘Chemical process optimization can be described as large-scale nonlinear constrained minimization. The modified augmented Lagrange multiplier methods (MALMM) for large-scale nonlinear constrained minimization are studied in this paper. The Lagrange function contains the penalty terms on equality and inequality constraints and the methods can be applied to solve a series of bound constrained sub-problems instead of a series of unconstrained sub-problems. The steps of the methods are examined in full detail. Numerical experiments are made for a variety of problems, from small to very large-scale, which show the stability and effectiveness of the methods in large-scale problems.
基金supported by the National Natural Science Foundation of China(Nos.51575269,51275232)the Six Talent Peaks Project in Jiangsu Province(No.ZBZZ005)the Zhejiang Provincial Key Laboratory for Cutting Tools(No.ZD201305)
文摘Boron doped diamond(BDD)performs well in electrochemical oxidation for organic pollutants thanks to its wide electrochemical window and superior chemical stability.We presented a method to obtain well-adherent large-scale BDD/Nb electrode by the modified hot filament chemical vapor deposition system(HFCVD).SiC particles were sand blasted to enhance the adhesion of BDD coating.The BDD coating was then deposited on both sides of Nb which was placed vertically and closely with filament grids on both sides.The BDD/Nb electrodes had no deformation because the thermal deformations of the BDD films on both sides of the Nb substrate conteracted each other during cooling process after deposition.The surface morphology and purity of the BDD/Nb electrode were analyzed by Raman and scanning elestron microscope(SEM)techniques.Scratch test was used to investigate the adhesion of BDD films.The electrochemical performances were measured by cyclic voltammetry test.The BDD electrode at the B/C ratio of 2 000×10^(-6) held a higher oxygen evolution potential thanks to its high sp3 carbon content.Accelerated life test illustrated that the sandblasting pretreatment obviously enhanced the adhesion of BDD coating which resulted in a longer service duration than the un-sandblasted one.
文摘2019 is the 70^th anniversary of the founding of the People’s Republic of China. In order to display and publicize the extraordinary achievements of China’s daily chemical industry in the past 70 years and tribute to the 70th anniversary of China, China Research Institute of Daily Chemical Industry has planned and launched a selection campaign named “2019 Top 100 Daily Chemical Enterprises in China” among China’s daily chemical industry for the first time.
基金Supported by the Science and Technology Plan Project of Liaoning Province,China(2019JH8/10300102)。
文摘In view of the environmental and safety risks of hazardous chemical explosions in chemical enterprises,the fault tree analysis was used to establish a fault tree model of hazardous chemical explosions and comprehensively analyze the possibility of the explosions.The 34 basic events that caused hazardous chemical explosions were expounded,and the minimum cut and path sets were obtained.The structure importance of basic events were calculated.According to the minimum path sets,the basic events when the accident does not occur were determined,and combined with the sequence of structure importance,the preventive measures for hazardous chemical explosion accidents were proposed.The fault tree model intuitively clarified the correlation between the direct causes of hazardous chemical explosion accidents,and proposed directions for effectively reducing the probability of hazardous chemical explosion accidents in the chemical industry.
文摘Guangdong Chengming Chemical S&T Co.,Ltd.,a modern high-tech papermaking chemical enterprise,specializes in the production and sales as well as providing technical services.CM Chemical has two production bases.Following are the history of our company:2003Dongguan Longteng Industrial Co.,Ltd.,the first chemical base completed in 2003 with annual capacity of 100,000t/year2013Nantong Tenglong Chemical Technology Co.,Ltd.,the second chemical base completed in 2013 with annual capacity of280,000t/year.
基金financially supported by the National Natural Science Foundation of China(51631001,51672010 and81421004)the National Key R&D Program of China(2017YFA0206301 and 2016YFA0200102)
文摘Fe3 O4 has attracted tremendous interest in vast areas of biomedicine and catalysis as well as environment engineering.However,it is highly desired to fully understand the chemical kinetic process and propose a general,surfactantfree,large-scale synthesis approach for Fe3 O4 spheres.Herein,we developed a facile scalable solvothermal method in the absence of surfactants to produce Fe3 O4 spheres with the yield of 5.1 g,which present tunable sizes from 107 to 450 nm by modulated molar ratio of Fe3+/COO-in the solution.Particularly,it is observed that the reactants undergo a redox process,composed of a precipitation-dissolution equilibrium combined with a coordination reaction(termed as RPC),to the final product based on the LaMer model.It is worth noting that the generation of di-carboxyl group and its coordination with iron cations determine the formation of Fe3 O4 spheres.This work not only offers a strategy to precisely tailor the particle size in scalable synthesis process,but also gives the insight on the role of dihydric alcohol in the formation mechanism of Fe3 O4 spheres in the absence of surfactants.
文摘Recently recommended by China Chemical Fibre Industry Association(CCFA),four companies of Jiangsu Shenghong Chemical Fibre Co.,Ltd.,Jiangsu Hengli Chemical Fibre Co.,Ltd.,Jiangsu Yingxiang Chemical Fibre Company Limited,Jiangsu Xinmin Technology Co.,Ltd.
文摘In recent years,with China’s accelerated implementation of the'going out'strategy and promotion of the'Belt and Road'construction and development,Chinese enterprises have grown rapidly and achieved breakthroughs in terms of overseas investment in copper industries and overseas development of copper resources that are in short supply in China.
