Hunan Chemical Vocational and Technical College

Zhuzhou, China

Hunan Chemical Vocational and Technical College

Zhuzhou, China
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Liu X.Y.,Hunan Chemical Vocational and Technical College
Advanced Materials Research | Year: 2014

3,4-Dihydropyrimidin-2(1H)-ones derivatives were synthesized in moderate to high yields in one-pot three component reaction from the corresponding aldehydes, 1,3-dicarbonyl compounds and urea, Coconut shell char sulfonic acid (CSCSA) used as a reusable, and efficient catalyst. Compared to the classical acid catalyst, This new protocol for the Biginelli reaction includes the following important features: excellent yields, non-toxic, inexpensive and easily available reagent. © (2014) Trans Tech Publications, Switzerland.


Tong M.,Hunan Chemical Vocational and Technical College | Chen H.,Central South University | Yang Z.,Central South University | Wen R.,Central South University
International Journal of Molecular Sciences | Year: 2011

A clean-route synthesis of Zn-Al-hydrotalcites (Zn-Al-LDHs) using zinc oxide and sodium aluminate solution has been developed. The as-obtained materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The effects of metal ions at different molar ratios on the performance of hydrotalcites were discussed. The results showed that the Zn-Al-hydrotalcites can be successfully synthesized at three different Zn/Al ratios of 3:1, 2:1 and 1:1. Thermal aging tests of polyvinyl chloride (PVC) mixed with Zn-Al-LDHs, calcium stearate (CaSt 2) and β-diketone were carried out in a thermal aging test box by observing the color change. The results showed that Zn-Al-LDHs can not only enhance the stability of PVC significantly due to the improved capacity of HCl-adsorption but also increase the initial stability and ensure good-initial coloring due to the presence of the Zn element. The effects of various amounts of Zn-Al-LDHs, CaSt 2 and β-diketone on the thermal stability of PVC were discussed. The optimum composition was determined to be 0.1 g Zn-Al-LDHs, 0.15 g CaSt 2 and 0.25 g β-diketone in 5 g PVC. © 2011 by the authors; licensee MDPI, Basel, Switzerland.


Tong M.,Hunan Chemical Vocational and Technical College | Tang Y.,Central South University
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2010

The medium alloy sample based on the Al-In-Zn-Sn alloy was formed by adding the rare earth metal Ce. The remelting and magnetic field solidification treatment were performed on the sample. The metalloscope, scanning electron microscopy (SEM) were used to analyze the surface states of the studied electrode. The electrochemical performances tests such as the anodic polarizing curve, AC impedance curve, the constant current discharge curve and so on have passed in 4 mol·L-1 KOH solution. The results showed that the magnetic field solidification treatment could increase the corrosion potential of Al-In-Zn-Sn-Ce alloy, and decrease the impedance of anode material, thus improve the discharge performance of anode.


Tian W.-J.,Hunan Chemical Vocational and Technical College | Yi W.-G.,Hunan Chemical Vocational and Technical College
Xiandai Huagong/Modern Chemical Industry | Year: 2010

A new one-step synthetic process for formaldehyde sodium sulfoxylate with formaldehyde, sodium bisulfite and zinc powder as raw materials is introduced. Its reaction mechanism is studied, and the optimum operational conditions are as follows: m(Zn):m(Na2S2O5): m(CH2O)=9:10:8, activation temperature ≤45°C, the highest reaction temperature of 95-102°C, and pyroreaction time is 90 minutes, the formaldehyde sodium sulfoxylate thus is got and its quality can reach the standard of HG 2281-1992. The new technology is successfully applied in Hunan Zhongcheng Chemical Company Ltd. with the formaldehyde sodium sulfoxylate production capacity of 6000 t/a.


Tian W.,Hunan Chemical Vocational and Technical College | Man R.,Central South University | Huang X.,Central South University | He F.,Central South University
Corrosion Science and Protection Technology | Year: 2014

A hybrid sol was prepared by sol-gel technique with precursors of ethylsilicate (TEOS) and vinyltriethoxysilane (KH151), and which then was further doped with 1.5× 103 mol/L Ce(NO3)3 to get a Ce-doped hybrid sol. A coating of this Ce-doped hybrid sol was prepared on aluminum tube by dipping method. Results of bluestone drips test, neutral salt spray test and electrochemical measurement showed that the coating doping modified hybrid film possessed superior corrosion performance rather than the conventional chromate passivation film. The infrared spectrum of the coating revealed that there existed different types of Si-O-Si covalent bonds and organic functional groups C=C covalent bonds, which might enhance the hydrophobicity of the coating. Finally SEM examination showed that the formed coating was dense, uniform and smooth.


Wang J.,Hunan University | Huang K.,Hunan University | Zhao S.,Hunan University | Ren D.,Hunan University | Peng X.,Hunan Chemical Vocational and Technical College
Shiyou Huagong/Petrochemical Technology | Year: 2010

The soap-free emulsion copolymerization of styrene, butyl acrylate and acrylic acid was investigated. The effects of acrylic acid dosage, potassium persulfate initiator dosage and neutralization degree on the emulsion stability, the monomer conversions, the latex particle sizes and their distribution were studied. The nucleation mechanism of the latex particles was discussed. The results showed that sodium acrylate in the system acted as a reactive emulsifier in the copolymerization. Under the conditions of the acrylic acid dosage 10% (based on the total monomer mass) and pH 5.6, the prepared emulsion is stable. The monomer conversions were heightened with increases of the dosages of acrylic acid and initiator at a definite neutralization degree. The main nucleation mechanism for the copolymerization is homogeneous nucleation and the dispersion coefficient of the latex particles is less than 1.03.


Tong M.,Hunan Chemical Vocational and Technical College | Wang L.,Hunan Chemical Vocational and Technical College | Chen D.,Hunan Chemical Vocational and Technical College | Zhou Z.,Hunan Chemical Vocational and Technical College
Petroleum Processing and Petrochemicals | Year: 2010

The process of preparing methyl isobutyl carbinol by catalytic hydrogénation of mesityl oxide in gas phase over Mn-modified Cu-Zn-Al catalyst was studied. The influence of catalyst compositions and the reaction conditions on the conversion of mesityl oxide and the selectivity to methyl isobutyl carbinol was investigated. The Cu-Zn-Al-Mn catalysts were characterized by XRD, TPR and BET method. Results showed that under the optimum conditions of using a catalyst with Mn mass fraction of 5% and Cu/Zn molar ratio of 1.2, a reaction temperature of 160 °C, a H2/mesityl oxide molar ratio of 3.5 and mesityl oxide feeding rate of 90.0 mL/h, the conversion of mesityl oxide reached 99.4% and the selectivity to methyl isobutyl carbinol was 96.6%.


Tong M.,Hunan Chemical Vocational and Technical College | Liu X.,Hunan Chemical Vocational and Technical College
Environmental Engineering and Management Journal | Year: 2011

Calcium zincate as an active material in Zn/Ni secondary battery has been successfully synthesized by microwave method. The sample was characterized by X-ray diffraction (XRD), thermogravimetric analysis, scanning electron microscope (SEM), chargedischarge test (CT) and cyclic voltammetry (CV) analysis. The results show that the chemical composition of sample is Ca(OH) 2·2Zn(OH) 2·2H 2O with regular spherical shapes. The results from CV and CT measurement indicate that the battery has very high discharge plateau of 1.688 V as well as an initial discharge capacity 246.48 mAh.g -1, and the battery capacity does not decay much during 120 cycles, exhibiting good prospect for practical use especially at high discharge rate.


Tong M.L.,Hunan Chemical Vocational and Technical College | Liu X.Y.,Hunan Chemical Vocational and Technical College
Advanced Materials Research | Year: 2011

Calcium zincate as an active material in Zn/Ni secondary battery has been successfully synthesized by microwave method. The chemical composition of Ca(OH) 2·2Zn(OH) 2·2H 2O was confirmed by X-ray powder diffraction pattern and weight loss in thermogravimetric analysis.The results of cyclic voltammetry and experimental Zn/Ni battery charge-discharge test showed that the material of calcium zincate had excellent electrochemical performances: A high discharging platform of 1.685 V and a good cycleability, discharge capacity would be 70.0% of initial capacity after circulated 120 times. © (2011) Trans Tech Publications.


Tang S.,Hunan Chemical Vocational and Technical College | Zhang R.,Jiangsu University of Science and Technology | Tong M.,Hunan Chemical Vocational and Technical College | She Y.,Hunan Chemical Vocational and Technical College
Chinese Journal of Environmental Engineering | Year: 2014

With dust containing antimony as raw material, nanometer antimony trioxide was prepared by the vacuum evaporation method after removing the impurity, and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the antimony trioxide are cubic crystal structure, the particle size is 35~100 nm. The influences of evaporation temperature, pressure and holding time on particle size and the evaporation time on the effect of impurity removing were investigated, respectively.

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