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Current Issue
2019 Vol.36 Issue.4,
Published 2019-07-15
0
2019 Vol. 36 (4): 0-0 [
Abstract
] (
2811
) [
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1KB] [
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400KB] (
2233
)
1
Synthetic Technology of 2,4-Dibenzyloxy-5-isopropenyl Benzoic Acid
Feng Wenyan, Xin Hongxing, Yan Hong
An important intermediate of non-ansamycin (AT13387), 2,4-dibenzyloxy-5-isopropenyl benzoic acid(
1
), was prepared via one-pot of Friedel-Crafts reaction and Fries rearrangement, nucleophilic substitution, Wittig reaction and hydrolysis of ester using the 2,4-dihydroxy-benzoic acid methyl ester as starting material. The structure of compound
1
was confirmed by
1
H NMR,
13
C NMR and MS. The comprehensive investigations on the optimization of reaction system, the rate of ingredients, reaction temperature and solvent on the yield of compound
1
were conducted. The overall yield was 65.8%.
2019 Vol. 36 (4): 1-6 [
Abstract
] (
5449
) [
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1602KB] (
2082
)
7
Research on VOCs Emission Detection Methods and Influencing Factors in Petrochemical Enterprises
Zhu Shiyue, Zhao Chaocheng, Han Fenglei
Samples of volatile organic compounds were collected from a refinery in Qingdao. The storage stability of two kinds of airbags with different materials was compared. At the same time, the samples were analyzed under the conditions of the control of light and whether the protective gas was added. It was concluded that the average recovery of PEA(polyester aluminum) air bags (79.6%±4.0%) was significantly better than that of PVF(polyvinyl fluoride) air bags(72.9%±4.0%) for stationary volatile organic compounds in the refinery. And light and protective gas will have a certain degree of impact on the experimental results.
2019 Vol. 36 (4): 7-17 [
Abstract
] (
2609
) [
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1KB] [
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20834KB] (
1940
)
18
Absorption of SO
2
by Ionic Liquid[BMIM]OH
Liang Changjuan, Li Honghai
To explore environmentally benign desulfurizer that was recyclable and greener, the solubility of SO
2
in 1-butyl-3-methylimidazolium hydroxide ([BMIM]OH), the effect of temperature on the absorption and desorption and the recyclability for the pure and supported ionic liquid had been studied. It was found that the equilibrium absorption amount of SO
2
could be up to 1.84 mols per mole of ionic liquid at 25℃ and 0.1 MPa. The dissolved amount of SO
2
in[BMIM]OH decreased as temperature increased, and the absorbed SO
2
could be desorbed by means of heating. The average desorption rate could achieve 99.3% and an average 1.47 mols of SO
2
could be separated per mole of ionic liquid for a 6 cycles' operation. The ionic liquid supported on porous silica gel showed good absorption and desorption capacity, and the average desorption rates could reach 96.6% for 4 cycles' operation. It is hopeful for[BMIM]OH to be applied in separation and recovery of SO
2
gas in industrial process.
2019 Vol. 36 (4): 18-22 [
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5415
) [
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4359KB] (
2135
)
23
Research Progress on Recovery of Valuable Metals from Spent Lithium Ion Batteries
Zhang Menglong, He Jiwen, Tian Huan, Wei Hao, Zhao Zhuo
With the large-scale applying of lithium-ion batteries in the fields of electric energy and energy storage, the environmental and resource problems caused by the spent lithium ion batteries (LIBs) have become increasingly prominent. The recycling of valuable metals in spent LIBs has great practical significance in comprehensive utilization of resources, energy conservation, environmental protection and sustainable development, and has gradually become a hot topic in the world. In this paper, the recovery status of valuable metals in spent LIBs at home and abroad in recent years is reviewed. The main processes include pretreatment, dissolution and leaching of electrode materials as well as separation and recovery of valuable metal elements in the leaching solution. The advantages and disadvantages of various methods are analyzed and compared. On this basis, the development trend and application prospect of recovery process in spent LIBs are analyzed and prospected.
2019 Vol. 36 (4): 23-30 [
Abstract
] (
2973
) [
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1682KB] (
2590
)
31
Synthesis of Sodium Dichloroisocyanurate with Sodium Hypochlorite
Tan Jinhui, Shi Yunhai, Yerzhan Serikkaliyev, Shi Hang
Sodium dichloro-iso-cyanurate (DCCNa) is a kind of solid chlorine-containing product. It is a kind of disinfectant with high efficiency, safety, easier transportation and reservation. The synthesis of sodium dichloro-iso-cyanurate with sodium hypochlorite has comparable advantages such as the simplicity of process and low corrosive, which can be produced near a chlorine alkali factory. An effective two-step way of producing sodium dichloro-iso-cyanurate was carried out experimentally in this paper, in which the available chlorine content of DCCNa can reach about 62%. The first step is to add chlorine into a caustic soda solution at a low temperature to make high concentration sodium hypochlorite. The second step is to add chlorine into the mixture of NaCLO and cyanuric acid. By filtration and drying under vacuum, the qualified mass content of DCCNa product can be manufactured.
2019 Vol. 36 (4): 31-36 [
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] (
3125
) [
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2485KB] (
2419
)
37
Experimental Study on Extracting Potassium from Sintering Dust Collecting Ash of Iron Ore Powder
Su Yi, Yi Dehua, Zheng Renhe
Sintering dust collecting ash is a solid waste produced in process of sintering iron ore powder which contains valuable elements such as potassium chloride and can be used as the secondary resource. In this paper, the leaching process of sintering dust, purification and evaporation of leaching liquid is studied to obtain potassium chloride product. Results show that the optimization conditions of the preparation are:leaching temperature 60℃, leaching time 0.5 h, ratio of leaching liquid to solid 1.5, 1.6 times of sodium carbonate theory dosage, purification at room temperature, precipitation time 0.5 h, mixing speed 300 r/min.
2019 Vol. 36 (4): 37-41 [
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] (
3140
) [
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2834KB] (
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)
42
Application of Four Intelligent Algorithms inPhase Equilibrium Data Fitting
Zhu Wei, Liu bin, Hou Haiyun, Li Qing, Wang Xinyuan, Fan Zenglu
The Marquardt-Levenberg(ML) algorithm is the most commonly used algorithm for phase equilibrium data fitting. However, this algorithm belongs to the local optimization algorithm. When ML algorithm was applied to multi-component system phase equilibrium data fitting, it is difficult to find the appropriate initial values for the general thermodynamic researchers owing to model parameters increasing sharply. In this paper, four kinds of intelligent algorithms, namely, genetic algorithm, neural network, annealing algorithm and particle swarm algorithm were applied to fitting the vapor-liquid equilibrium data of
n
-propanol (1)+acetonitrile (2) binary system by Wilson model and fitting the vapor-liquid equilibrium data of methanol (1)+acetonitrile (2)+1-ethyl-3-methylimidazolium tetrafluoroborate (3) ([EMIM] [BF
4
]) ternary system by NRTL model, respectively. The mainly influencing factors of four algorithms on the phase equilibrium data fitting application were discussed. The results were also analyzed and compared. On the basis of above work, the scope of the application and the use of recommendations of each method were proposed.
2019 Vol. 36 (4): 42-50 [
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2958
) [
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4139KB] (
3030
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51
Application of Fluent Software in Simulation of Chemical Equipment
Cao Yu, Geng Shiwei, Li Huping, Luo Kangbi, Su Yi, Mei Yi
Fluent software is a type of computational software, which is built on fluid mechanics and used for flow field study, and now it is widely applied in the field of process simulation. This paper aims to explore the simulation of Fluent software in common chemical equipment. Specifically, in the research on mixer, it is mainly focused on simulating and investigating the influence of internal component changes (i.e. blades and mixing heads) on the process of fluid flow, with the aim to develop the mixer that has good mixing effects. In the research on heat exchanger, it is focused more on simulating and analyzing the flow field within the structural changes of heat transfer channels, in order to find out the effective solutions to enhance the fluid flow and heat transfer. In the research on reactor, it is focused on simulating and analyzing the influence of reactor structure, type and operating parameter change on the reactor characteristics, so as to fulfill the optimization of reactors. In the research on crystallizer, the effects of different crystal growth parameters on the flow field, temperature field and pressure field of the crystallizer are mainly simulated, which provides a basis for the optimization of the crystallizer. In all the researches on equipment mentioned above, Fluent software can be applied to accelerate the process optimization and to analyze the hydrodynamics rule of the process intuitively. As a result, Fluent software will be applied more and more in the chemical industry field in the future.
2019 Vol. 36 (4): 51-57 [
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3028
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58
Flow and Heat Transfer Characteristics of Falling Film on the Vibration Plate
Yang Li, Jiang Bin
In order to enhance the heat transfer of falling film of the plate, the coupling technology of VOF and dynamic mesh is used, and the UDF function was made up, the model of the calculation of flow and heat transfer of the falling film on the vibration plate was established. As for considering the effects of surface tension and contact angle of wall to flow of liquid film, heat transfer of the falling film affected by different parameters was studied and analyzed. The results show that vibration makes the liquid film fluctuate violently and enhances the heat and mass transfer of the liquid film. What's more, with the increase of amplitude and frequency, heat transfer of the liquid film is improved. When the frequency and amplitude increase simultaneously, the heat transfer effect is enhanced obviously. Within the parameters of the study, when frequency
f
=50 Hz and amplitude
A
=2.0 mm, the heat transfer is 27% higher than that of the non-vibrating plate falling film.
2019 Vol. 36 (4): 58-61 [
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] (
4195
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2698KB] (
2287
)
62
Simulation and Optimization of Soda Spray Drying Process
Deng Yiping, Zhang Lei
Taking the annual production of 40 000 tons of soda ash as an example, the Aspen Plus software is used to simulate the transfer of NaHCO
3
slurry and air in a spray drying tower by means of a downward concurrent flow heat transfer to obtain soda powder that meets the requirements. Sensitivity analysis is used to determine the effect of pump pressure, air temperature and feed volume on product temperature, humidity, average diameter and energy consumption, respectively. Then the composite fuzzy control algorithm is added, and the simulation algorithm is proved to be suitable for the promotion of soda powder spray drying control process.
2019 Vol. 36 (4): 62-69 [
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2344
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7568KB] (
2288
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70
Preparation of Macroporous Agarose-Based Chromatographic Media Using a Double Emulsification Method and Its Binding with HBsAg
Huang Lan, Huang Yongdong, Zhao Lan, Zhu Kai, Wu Xuexing, Zhou Danni, Su Zhiguo, Ma Guanghui, Wang Qibao
The macroporous chromatographic media are of great importance in the field of bioseparation, especially for large biomolecules. Limited by both of the material properties and preparation technology, the macroporous chromatographic media were mostly prepared from synthetic polymers, and native polymers, e.g., agarose, were rarely used. In this paper, macroporous agarose microspheres were prepared by double emulsification method. The effects of preparation conditions on microsphere morphology and pore formation, as well as particle size and distribution were studied. It was found that the microspheres have micro-scale super-large pore structure and the pore structure shows certain regularity due to the influence of preparation conditions. The concentration of agarose solution, the ratio of internal/external oil phase to water, the speed of colostrum and the speed of ball formation are all important for pore formation. Confocal laser scanning microscopy results showed that the macroporous agarose microspheres after being functionalized with ion-exchange groups had a good binding ability to Hepatitis B Surface antigen (HBsAg) and this antigen can completely enter the inside of the microspheres. Compared with conventional agarose-based chromatographic media, macroporous agarose-based media combined macromolecular vaccine more quickly and fully, and had wide prospects of application in the field of purification of large biomolecules.
2019 Vol. 36 (4): 70-79 [
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2539
) [
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18381KB] (
2015
)
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