Equilibrium sorption amount, desorption diffusion coefficients and sorption diffusion coefficients of CO2 in poly(l-lactic acid)(PLLA) films at elevated pressures were determined by the gravimetric method, in which th...Equilibrium sorption amount, desorption diffusion coefficients and sorption diffusion coefficients of CO2 in poly(l-lactic acid)(PLLA) films at elevated pressures were determined by the gravimetric method, in which the Fick's diffusion model was applied to analyze both the desorption and sorption processes. The equilibrium sorption amount of CO2 in PLLA increased with lowering temperature and elevating pressure at the temperature range from 40 to 60 °C and pressure from 104to 2×104kPa. Desorption diffusion coefficients were greatly influenced by the equilibrium sorption amount, and they were in the same order of magnitude as the sorption diffusion coefficients. The scan electron microscope(SEM) photos demonstrated that there was no foaming phenomenon of the PLLA film during desorption and sorption processes. The XRD spectra implied that the crystalline degree of PLLA film decreased after CO2 processing. It was concluded that PLLA polymer could be well swollen and plasticized by supercritical CO2.展开更多
This paper presents a process development and design of chlorine dioxide production based on hydrogen peroxide. The process is characterized by cleaner production, high efficiency, and waste minimization. Optimization...This paper presents a process development and design of chlorine dioxide production based on hydrogen peroxide. The process is characterized by cleaner production, high efficiency, and waste minimization. Optimization of process conditions, selection of equipment, and experiment of recycle of waste acid are carried out. The process design is realized in consideration of several aspects such as operation, material, equipment design and safety. An industrialized process flowsheet is developed according to experiment. A pilot testing is carried out to confirm the lab results. Process design of chlorine dioxide production based on hydrogen peroxide is realized.展开更多
采用悬液定量试验,观察了脊髓灰质炎病毒对过氧乙酸、有机含氯消毒剂、二氧化氯等消毒剂的抗力并与大肠杆菌F2噬菌体作平行比较。结果,过氧乙酸对脊髓灰质炎病毒的灭活对数值>5.00,需要500 mg/L作用30m in;对F2噬菌体的灭活对数值>...采用悬液定量试验,观察了脊髓灰质炎病毒对过氧乙酸、有机含氯消毒剂、二氧化氯等消毒剂的抗力并与大肠杆菌F2噬菌体作平行比较。结果,过氧乙酸对脊髓灰质炎病毒的灭活对数值>5.00,需要500 mg/L作用30m in;对F2噬菌体的灭活对数值>5.00,需要1500 mg/L作用60 m in。二氧化氯对脊髓灰质炎病毒灭活对数值>5.00,需要200 mg/L作用5 m in;对F2噬菌体灭活对数值>5.00,需要300 mg/L作用5 m in。有机含氯消毒剂对脊髓灰质炎病毒灭活对数值>5.00,需要有效氯500 mg/L作用30 m in;对F2噬菌体灭活对数值>5.00,需要有效氯1000 mg/L作用10 m in。结论,脊髓灰质炎病毒对过氧乙酸抗力明显低于大肠杆菌F2噬菌体;脊髓灰质炎病毒对有机含氯消毒剂和二氧化氯的抗力均略低于大肠杆菌F2噬菌体。展开更多
为了解三种消毒方法对室内空气消毒效果,采用现场试验方法对二氧化氯气溶胶喷雾、臭氧熏蒸和氯溴异氰尿酸烟雾剂熏蒸等三种方法进行了比较观察。结果,用50 mg/L二氧化氯按20 m l/m3用量进行气溶胶喷雾作用90 m in,对室内空气中自然菌消...为了解三种消毒方法对室内空气消毒效果,采用现场试验方法对二氧化氯气溶胶喷雾、臭氧熏蒸和氯溴异氰尿酸烟雾剂熏蒸等三种方法进行了比较观察。结果,用50 mg/L二氧化氯按20 m l/m3用量进行气溶胶喷雾作用90 m in,对室内空气中自然菌消亡率91.58%。用10 mg/m3臭氧熏蒸作用60 m in,对空气中自然菌消亡率为82.00%。用氯溴异氰尿酸烟雾剂按照0.3 g/m3用量进行烟雾熏蒸作用120 m in,对空气中自然菌消亡率为80.63%。结论,三种消毒法对空气中自然菌都有杀灭作用,但以二氧化氯气溶胶喷雾法效果最好且用药量低。展开更多
基金Supported by the National Natura Science Foundation of China （21076185）.
文摘Equilibrium sorption amount, desorption diffusion coefficients and sorption diffusion coefficients of CO2 in poly(l-lactic acid)(PLLA) films at elevated pressures were determined by the gravimetric method, in which the Fick's diffusion model was applied to analyze both the desorption and sorption processes. The equilibrium sorption amount of CO2 in PLLA increased with lowering temperature and elevating pressure at the temperature range from 40 to 60 °C and pressure from 104to 2×104kPa. Desorption diffusion coefficients were greatly influenced by the equilibrium sorption amount, and they were in the same order of magnitude as the sorption diffusion coefficients. The scan electron microscope(SEM) photos demonstrated that there was no foaming phenomenon of the PLLA film during desorption and sorption processes. The XRD spectra implied that the crystalline degree of PLLA film decreased after CO2 processing. It was concluded that PLLA polymer could be well swollen and plasticized by supercritical CO2.
基金Supported by the Excellent Young Scientist Award of NSFC (20225620) the National Natural Science Foundation of China (No. 20376025) the Ministry of Education of China, the Bureau of Education of Guangdong Province.
文摘This paper presents a process development and design of chlorine dioxide production based on hydrogen peroxide. The process is characterized by cleaner production, high efficiency, and waste minimization. Optimization of process conditions, selection of equipment, and experiment of recycle of waste acid are carried out. The process design is realized in consideration of several aspects such as operation, material, equipment design and safety. An industrialized process flowsheet is developed according to experiment. A pilot testing is carried out to confirm the lab results. Process design of chlorine dioxide production based on hydrogen peroxide is realized.
文摘采用悬液定量试验,观察了脊髓灰质炎病毒对过氧乙酸、有机含氯消毒剂、二氧化氯等消毒剂的抗力并与大肠杆菌F2噬菌体作平行比较。结果,过氧乙酸对脊髓灰质炎病毒的灭活对数值>5.00,需要500 mg/L作用30m in;对F2噬菌体的灭活对数值>5.00,需要1500 mg/L作用60 m in。二氧化氯对脊髓灰质炎病毒灭活对数值>5.00,需要200 mg/L作用5 m in;对F2噬菌体灭活对数值>5.00,需要300 mg/L作用5 m in。有机含氯消毒剂对脊髓灰质炎病毒灭活对数值>5.00,需要有效氯500 mg/L作用30 m in;对F2噬菌体灭活对数值>5.00,需要有效氯1000 mg/L作用10 m in。结论,脊髓灰质炎病毒对过氧乙酸抗力明显低于大肠杆菌F2噬菌体;脊髓灰质炎病毒对有机含氯消毒剂和二氧化氯的抗力均略低于大肠杆菌F2噬菌体。
文摘为了解三种消毒方法对室内空气消毒效果,采用现场试验方法对二氧化氯气溶胶喷雾、臭氧熏蒸和氯溴异氰尿酸烟雾剂熏蒸等三种方法进行了比较观察。结果,用50 mg/L二氧化氯按20 m l/m3用量进行气溶胶喷雾作用90 m in,对室内空气中自然菌消亡率91.58%。用10 mg/m3臭氧熏蒸作用60 m in,对空气中自然菌消亡率为82.00%。用氯溴异氰尿酸烟雾剂按照0.3 g/m3用量进行烟雾熏蒸作用120 m in,对空气中自然菌消亡率为80.63%。结论,三种消毒法对空气中自然菌都有杀灭作用,但以二氧化氯气溶胶喷雾法效果最好且用药量低。
