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Current Issue
2020 Vol.37 Issue.2,
Published 2020-03-15
0
2020 Vol. 37 (2): 0-0 [
Abstract
] (
3406
) [
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1KB] [
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724KB] (
1751
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19
Progress on Defects in Organic Crystal
Yu Zengrui, Wang Yongli, Zhou Jing, Zhou Lina
Crystal defects such as cracks, inclusions, dislocations and voids in organic crystal caused impurity occlusion, product quality degradation, and reduced optical and mechanical properties. Crystals that contained a large number of defects faced many difficulties in both the post-processing stage and in-service stage of the product. In recent years, it has become a hot spot for researchers of crystallography. In view of the lack of comprehensive reports on the investigation of organic crystal defects, the formation mechanism and types of crystal defects are described. The detection methods and characterization methods of crystal defects are discussed in detail. The regulation methods for reducing the formation of organic crystal defects are reviewed. The application of crystal defects and crystal morphology control methods in explosives, nonlinear optical materials, and crystal properties improvement of semiconductor materials are summarized.
2020 Vol. 37 (2): 19-29 [
Abstract
] (
4165
) [
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2968
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30
Synthesis of Pyran Heterocyclic Compounds Catalyzed by Phosphorylated Polyacrylonitrile Fibers
Li Mengmeng, Zhang Chenlu, Ma Ning
The phosphorylated polyacrylonitrile fiber catalyst (PAN
EAP
F) was synthesized by stable covalent bond grafting with cheap and easily available polyacrylonitrile fiber as the support, and it was used to catalyze the synthesis of pyran heterocyclic compounds. The catalytic activity of phosphorylated polyacrylonitrile fiber was evaluated by the three-component reaction of aromatic aldehyde, malononitrile and
α
-naphthol as well as the Friedel-Crafts reaction of 4-hydroxycoumarin and aromatic aldehyde. The effects of the fiber functionality, solvent, reaction temperature, reaction time and catalyst dosage on the catalytic reactions were investigated. The PAN
EAP
F for the synthesis of pyran derivatives showed high catalytic activity and wide substrate applicability. In addition, the catalyst is easy to be recovered from the reaction system and still maintains good stability and catalytic activity after multiple cycles, which indicates the potential industrial application prospect of this green, efficient and recyclable fiber catalyst.
2020 Vol. 37 (2): 30-37 [
Abstract
] (
4181
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5263KB] (
1845
)
38
A Synthetic Process of Benzoprogesterone
Wang Yuewei
This paper developed a novel synthesis process of benzoprogesterone. The target compound benzoprogesterone was prepared from 16
α,
17a-epoxyprogesterone by reduction, oxidation, cyclization and refining. The structure was confirmed by MS and
1
H-NMR. The purity by HPLC was 99.5%, and the total yield rate was 75%, and the novel synthetic process is simple, safe and suitable for industrial production.
2020 Vol. 37 (2): 38-42 [
Abstract
] (
4103
) [
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1650KB] (
1501
)
43
Experimental and CFD Study on Solids Suspension in a Solid-Liquid Stirred Tank With Different Impellers
Wang Huina, Du Xiuxin, Duan Xiaoxia, Yang Chao
The power consumption, pumping capacity and solids suspension characteristics with the novel Half-Folded turbine (HFT) were studied compared to the radial Rushton disk turbine (RDT) and 45° pitched blade turbine pumping down (PBTD) in a solid-liquid stirred tank. In the experiment, the water and glass spheres were selected as the liquid and solid phases, respectively. Meanwhile, the axial velocity distribution of the particles with different impeller types were predicted by computational fluid dynamics (CFD). It is found that the power consumption of RDT is the largest among three impellers. And for HFT, it is close to the power consumption of PBTD at the same rotational speeds. What’s more, compared to RDT and PBTD, HFT has the highest flow number and the strongest pumping capacity. In the solid-liquid system, the flow pattern of HFT is similar to that of PBTD. However, HFT shows the best performance of solids suspension among them.
2020 Vol. 37 (2): 43-53 [
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4591
) [
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6287KB] (
2572
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54
Preparation and Application of Dual-Emission Fluorescent Probe Based on Carbon Dots Coupled with Gold Nanoclusters
Zhang Xiaoyin, Yu Liping
Carbon dots (CD) were synthesized from citric acid using a hydrothermal method, and gold nanoclusters (AuNCs) were prepared from chloroauric acid (HAuCl
4
) with sulfur-containing hyperbranched polyamide-amines as template and reducing agent. Then, the double-emitting fluorescent probes (CD-AuNCs) were obtained by mixing carbon dots and gold nanoclusters. Transmission electron microscopy images showed that the particle diameters of CD both were about 2 nm and dispersed uniformly. The effect of pH on the fluorescence performance of CD-AuNCs was investigated. It was found that the fluorescence of CD-AuNCs reached the strongest at pH=6, and CD-AuNCs responsed sensitively to tetracyclines (TCs) at this pH. The CD-AuNCs probe is not only highly selective, but also has the advantages of a wider linear range and a higher sensitivity than the single CD probe.
2020 Vol. 37 (2): 54-59 [
Abstract
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4995
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60
Study on Functional Rule and Mathematical Model of Influence Factors of Magnetic Disposing Incrustation
Wang Yubin, Wang Wangbo, Qi Xiaoyu, Wang Gang, Wang Yan
There are many factors influencing the descaling of calcium carbonate under alternating magnetic field. To investigate the effect of different technological factors on calcium carbonate scaling under magnetic field, the saturated calcium carbonate solution was magnetized by orthogonal method. The results showed that the magnetizing time and the initial calcium ion concentration are the most notable factors affecting the conductivity of magnetized solution. When the magnetizing time was 0.5 h, the current frequency was 0.6 kHz, the coil turns were 100, the
c
0
(Ca
2+
) was 1 000 mg/L, and the waveform was square wave, the average conductivity of the magnetized solution was 1.474 mS/cm under this condition. Compared with the unmagnetized calcium carbonate solution, its conductivity increased by 0.147 mS/cm and increased by 11.45 percentage points. It means good scale descaling effect. The mathematical model of magnetic descaling effect established by regression analysis method can provide a theoretical basis for improving the efficiency of magnetic descaling of pipelines, and has important reference significance for descaling of cooling water system.
2020 Vol. 37 (2): 60-65 [
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3518
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863KB] (
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66
Catalytic Distillation Simulation of Acetone Condensation for Mesityl Oxide
Zhao Jieyan, Cai Wangfeng, Wang Yan
The process of dehydration condensation of acetone was simulated with Aspen Plus. We conducted a series of experiments to obtain the reaction kinetics of acetone dehydration condensation for diacetone alcohol (DAA) and mesityl oxide (MSO). The effect of reaction temperature on reaction ratio was discussed. As a result, a reaction kinetic model was established. A user-supplied subroutine was compiled to the Aspen Plus. During the simulation process, the influences of the number of reaction sections, the feed stage, the number of rectification sections and the number of stripping sections were discussed. Under the optimized process conditions of the reactive distillation column, the conversion of acetone reaches to 99%, and the selectivity of MSO is up to 93%.
2020 Vol. 37 (2): 66-72 [
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4395
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73
Dynamic Adsorption Properties of Quaternary Ammonium Ion Polyacrylonitrile Fiber on Dyes
Wang Lu, Feng Jingjing, Tao Minli
The quaternary ammonium ion polyacrylonitrile fiber adsorbent was prepared by quaternization of fiber. It was used to remove anionic dyes in water, and the dynamic adsorption performance of adsorbent on methyl orange was studied. The influence of concentration of methyl orange wastewater, height of adsorption column and flow rate on the breakthrough curve was investigated. Thomas model, Yoon-Nelson model and BDST model were used to fit these experimental data in order to predict the dynamic adsorption capacity, 50% and 10% breakthrough time of adsorbent when the concentration and flow rate changed. The prediction results are basically consistent with the experimental results, indicating that these three models can simulate the dynamic adsorption well in the actual industrial wastewater treatment.
2020 Vol. 37 (2): 73-79 [
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4696
) [
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2483KB] (
1949
)
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