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Current Issue
2019 Vol.36 Issue.5,
Published 2019-09-15
0
2019 Vol. 36 (5): 0-0 [
Abstract
] (
3789
) [
HTML
1KB] [
PDF
329KB] (
4188
)
1
Pt and Ceria Promoted Ni/SBA-15 for
n
-Dodecane Steam Reforming for Hydrogen Production
Liu Junyu, Xiao Zhourong, Zhang Xiangwen
Ni supported on SBA-15 was prepared via ethylene-glycol-assisted impregnation method and the performance of the as-prepared catalyst was tested by
n
-dodecane steam reforming. Pt and CeO
2
used as promoter and reaction condition affected the performance of Ni/SBA-15 in
n
-dodecane steam for hydrogen production. Various techniques including nitrogen adsorption-desorption, H
2
-TPR, TEM, XRD, and TG/DTG were employed to characterize the fresh and spent catalysts. Results show that the Pt and CeO
2
used as promoter could enhance the dispersion of Ni. Pt promoted Ni/SBA-15 could reduce the reduction temperature, thus increase the activity and stability for
n
-dodecane steam reforming. Pt and CeO
2
co-promoted Ni/SBA-15 showed the complete conversion of
n
-dodecane and was stable for hydrogen production (5 200 μmol/min).
2019 Vol. 36 (5): 1-10 [
Abstract
] (
5704
) [
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1KB] [
PDF
15918KB] (
3781
)
11
Interaction between Magnetic Ionic Liquids and Surfactants
Wang Tianyang, Wang Yongli, Liu Jinyan, Qin Xuedong
In this paper, quaternary phosphnium salt based magnetic ionic liquids (MILs) with different carbon chain length of cation structures selected to be studied are tetra-
n
-butylphosphonium ([P
4444
]FeCl
4
) and tri-
n
-butylteradecylphosphonium ([P
44414
]FeCl
4
). Interaction with cetyltrimethyl ammonium bromide (CTAB) or sodium bis(2-ethylhexyl) sulfosuccinate (AOT) is studied in aqueous/nonaqueous solution, respectively. Micelles formed with CTAB in aqueous solution and microemulsion formed with AOT in cyclohexane were tested and analyzed by conductance method. The results show that[P
4444
]FeCl
4
cannot interact with surfactants in both aqueous and nonaqueous solutions. However,[P
44414
]FeCl
4
with longer carbon chain, its properties are different from surfactants in aqueous and nonaqueous solutions. It didn't interact with CTAB in aqueous solution. However, its properties in microemulsion system formed by AOT/cyclohexane/water weren't as same as those in aqueous solution. To some extent, interaction between[P
44414
]FeCl
4
and AOT in oil-water interface would facilitate miniemulsion polymerization.
2019 Vol. 36 (5): 11-16 [
Abstract
] (
5212
) [
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1KB] [
PDF
5213KB] (
4691
)
17
Improvement and Optimization of Two Reactor H
2
S Selective Oxidative in Sulfur Recovery Process
Zhai Ruiguo, Dang Xiaofeng, Xia Yong, Huang Changmeng, Chen Xing, Lv Jing
A natural gas purification plant with sulfur recovery unit in Shan'xi province which using H
2
S selective oxidation technology was put into operation in January 2016. Some problems such as hot spot temperature higher than 300℃ in isothermal reactor and sulfur entrainment from separator were detected, resulting in high concentration of SO
2
in flue gas. Through operation data analyzing, and combining laboratory experiment and simulation, the asymmetry distribution of the reactor boiler's steam pipe is determined as the main reason of the high temperature hot spot. The gas velocity in the sulfur separator is lower than the design value which lead to more sulfur entrainment. Targeted modification to the unit were conducted to make the plant running more stable, including uniform distributing reactor boiler's steam pipe, increasing the gas velocity in sulfur separator by decrease internal's area. The results showed lower hot spot temperature (<300℃), higher yield of sulfur recovery, and decreasing of SO
2
concentration to lower than 4 000 mg/Nm
3
in flue gas.
2019 Vol. 36 (5): 17-24 [
Abstract
] (
5042
) [
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1KB] [
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5373KB] (
3930
)
25
Research Progress on Heterogeneous Catalysts for DMCD Synthesis
Shi Hai, Zhao Xuqun, Zou Zhan
Due to the harmful raw materials and difficulty of degradation, the engineering plastics produced by polyester would cause serious environmental problems and endanger the human health. Traditional polyester materials can not meet the increasingly stringent environment requirement. Therefore, we have to develop safe and environment-friendly alternative materials. The polyester synthesized using safe and green raw material (dimethyl 1,4-cyclohexanedicarboxylate (DMCD)) exhibiting excellent performance has been widely used in food packaging, children's toys, etc. DMCD is usually produced through catalytic hydrogenation of dimethyl terephthalate (DMT) in industry. The key and difficulty point of this process are the development of catalysts with high performance. At present, Pd, Ru, Rh and Ni catalysts are the most reported catalysts used for hydrogenation of DMT to DMCD. In this work, the research progress on the development of DMT hydrogenation catalysts was introduced. The effect of catalysts and the reaction conditions of synthesis of DMCD were systematically summarized. This paper may provide a reference for design and development of high activity catalysts for DMCD synthesis.
2019 Vol. 36 (5): 25-30 [
Abstract
] (
5412
) [
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1KB] [
PDF
1124KB] (
4387
)
31
Preparation of Layered Titanosilicate by Organosilane Coupling Agent (KH550)
Zhao Dazhou
In alkaline environment, organosilane coupling agent intercalated titanium silicate (KH-LTS) was synthesized via sol-gel method by using titanium tetrachloride as titanium source, silica as silica source and organic silane coupling agent (KH550) as structure-directing agent. The structure and stability of the composites were characterized by XRD, infrared spectroscopy, TG and SEM. The results show that the KH-LTS has ordered layered mesoscopic structure, and the interlayer spacing is around 3.2 nm. The layered structure is stable in a alkaline environment, unstable and easy to be destroyed in acidic environment, which provides a theoretical basis for exchange intercalation and pyrolysis of petroleum.
2019 Vol. 36 (5): 31-35 [
Abstract
] (
5200
) [
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1KB] [
PDF
2642KB] (
4189
)
36
Optimization of Modification Technics of Aniline Modified Walnut Shell as Pb(Ⅱ) Adsorbent
Tang Qi, Tu Sheng, Wang Xiaohua, Li Chuanqiang, Lin Zhenxue
Aniline modified walnut shell can significantly improve adsorption rate for Pb(Ⅱ) ions. Some factors, including the concentration of hydrochloric acid, aniline concentration, ammonium persulfate/aniline molar ratio, reaction temperature, reaction time, particle size of walnut shell and walnut shell dosage, were investigated in detail. Based on single factor experiments, the modification technique was further optimized through orthogonal experiments and comparative experiments. Optimum modification technics are as follows:in 150 mL of solution, aniline concentration is 0.4 mol/L, walnut shell dosage is 6 g, ammonium persulfate/aniline molar ratio is 1:1, the concentration of hydrochloric acid is 1.0 mol/L, modification temperature is 20℃ and modification time is 2 h. 1 g adsorbent which was prepared under the selected optimal conditions was used to treat 150 mL of 200 mg/L simulated wastewater containing Pb(Ⅱ) ions. The adsorption rate of Pb(Ⅱ) ions was 95.86% and the adsorption capacity of adsorbent was 28.76 mg/g.
2019 Vol. 36 (5): 36-42 [
Abstract
] (
4886
) [
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1KB] [
PDF
2732KB] (
4627
)
43
Purifying Urban Polluted Rainwater with Fibre Bundle-Activated Carbon-Zeolite Coupled System
Cao Junrui, Wang Xunliang, Ma Yuhui, Wang Shuxun, Zhao Jin, Wang Wenhua, Jiang Tianxiang
In order to control the rainwater pollution from road runoff effectively, a fibre bundle-activated carbon-zeolite system was designed to remove a variety of pollutants such as turbidity, TOC, NH
4
+
-N and PO
4
3-
. The results showed that when the concentration of turbidity, TOC, NH
4
+
-N and PO
4
3-
were in the range of 3.85 NTU to 25.60 NTU, 4.58 mg/L to 17.80 mg/L, 0.31 mg/L to 1.42 mg/L and 0.05 mg/L to 0.36 mg/L respectively, the removal rates were 79.2% to 96.9%, 82.7% to 87.2%, 87.5% to 94.0% and 52.9% to 65.6%, respectively. Activated carbon has an excellent adsorption capacity for TOC, and the adsorption process conformed to Langmuir adsorption isotherm model. The maximum adsorption capacity of monomolecular layer was 41.70 mg/g. While zeolite has a better adsorption capacity for NH
4
+
-N and PO
4
3-
than the activated carbon, and the adsorption process also conformed to Langmuir adsorption isotherm model. The maximum adsorption capacity of monomolecular layer was 12.31 mg/g and 0.64 mg/g respectively. The combined process was an ideal method to purify the urban polluted rainwater.
2019 Vol. 36 (5): 43-51 [
Abstract
] (
5245
) [
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1KB] [
PDF
11665KB] (
3635
)
52
Comparison of Gasification Technologies for Coal to Natural Gas Projects
Li Yahui, Zhu Yunfeng, Sun Feng, Xu Wei
In recent years, China's coal-based natural gas(SNG) industry has developed rapidly. This paper started from the selection of coal gasification technology, combining with the water gas shift, gas purification and methanation process. The material balance of the whole process was calculated by simplified method, the influence of gasification technology on the production of synthetic natural gas was analyzed, and two main moving bed gasification technology (LURGI and BGL) was compared and discussed. The investment and economic operation benefits of different technical routes was compared, which indicates that moving bed gasification technology has more economic and technological advantages than the other two process.
2019 Vol. 36 (5): 52-57 [
Abstract
] (
4757
) [
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1KB] [
PDF
1534KB] (
4161
)
58
Preparation of Size Controllable CeO
2
Nanoparticle by Sol-Reverse Microemulsion System
Hua Li, Xiao Linjiu, Li Wenze, Guo Jian
The reverse microemulsion system formed by cyclohexane/H
2
O/CTAB/
n
-butanol was used as the reaction medium. The aqueous phase was the sol formed by adjusting the pH of Ce(NO
3
)
3
solution. The effect of concentration of Ce(NO
3
)
3
, temperature and pH of sol and the reverse microemulsion system on particle size of CeO
2
was studied. The product was characterized by XRD and laser particle size analyzer. The results show that CeO
2
particles with controlled particle size can be prepared within 1~100 nm. When the concentration of Ce(NO
3
)
3
was 1.2 mol/L, the temperature of the sol and reverse microemulsion system was 25℃, and the pH of the reverse microemulsion system was 8, CeO
2
particles having a
D
90
particle size of 25~45 nm can be obtained.
2019 Vol. 36 (5): 58-63 [
Abstract
] (
5344
) [
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1KB] [
PDF
5312KB] (
3746
)
64
Effect of Carboxyl Carbon Nanotubes on the Mechanical Properties of T700 Carbon Fiber Composites
Wang Yang, Zheng Guodong, Xu Xiaoming
Different contents (mass fraction 0.25%, 0.50%, 1.0%) of carboxyl multi-walled carbon nanotubes (MWCNTs-COOH) were dispersed in 603 epoxy resin. T700 carbon fiber prepared containing carbon nanotubes had been successfully produced by hot-melt method and then the laminated composites plates were prepared. The results confirmed that with the increase of MWCNTs-COOH content, the cured degree of matrix is gradually decreased. When the MWCNTs-COOH content is less than 0.5%, MWCNTs-COOH can improve the mechanical properties of the resin matrix and carbon fiber composite material; and when MWCNTs-COOH content increased to 1.0%, the properties of the matrix and the composite material are degraded.
2019 Vol. 36 (5): 64-69 [
Abstract
] (
5326
) [
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1KB] [
PDF
8446KB] (
4587
)
70
Effect of Expansion Pressure and Initial Clearance on Expansion Joint Quality of Heat Exchanger
Duan Mingde, Sheng Qingzhi, Zhang Zhuangya, Yang Baoxu, Liu Jingbo
In order to study the effects of heat transfer tube-tube plate expansion pressure and initial gap on heat exchanger expansion quality, the reliability of the hydraulic expansion joint was studied by the method of expansion parameterized simulation, and the elasto-plastic parameterized geometric model of heat exchange tube-tube plate expansion joint was established, and different expansion joint pressure and initial clearance of heat exchange tube-tube plate were performed. The residual equivalent stress, residual contact stress and distribution law of heat transfer tubes were obtained. The results show that when the expansion joint pressure is the same and the gap is different, the different of residual equivalent stress and residual contact stress value after unloading are smaller; When the initial gap is the same and the expansion pressure is different, residual stress and residual contact stress after unloading are quite different. The residual contact stress on the outer surface of the heat exchange tube increases with the increase of expansion joint pressure, and the residual equivalent stress also increases with the increase of the expansion joint force, and the change trend is consistent. When the material is Ti31 titanium alloy and the expansion pressure is 183 MPa, the initial clearance between heat exchanger tube and tube sheet is eliminated. The results provide the basis for optimizing the optimal expansion joint performance of heat exchangers and improving the quality of expansion joints.
2019 Vol. 36 (5): 70-79 [
Abstract
] (
4497
) [
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1KB] [
PDF
25731KB] (
3788
)
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