Application of Chemical Engineering

Volumes 236-238

doi: 10.4028/

Paper Title Page

Authors: Wei Dong Pan, Ren Guo Gu, Ying Guang Fang
Abstract: Using laboratory experiment method, the micro-electric field effect on seepage in micro particle clays is discussed in this paper. A series of micro-and mesoscopic parameters and seepage consolidation tests are conducted for the samples of micro particle clays with different ion concentrations in pore water or particle surface electric potentials. The test results show that an increase in particle surface electric potential or a decrease in ion concentration will result in the decrease of equivalent permeability coefficient, consolidation rate and consolidation displacement, revealing the existence of micro-electric field effect on seepage in micro particle clays.
Authors: Yang Hu, Zi Ming Yang, Jia Yi Liu, Jian Hua Cheng, Zhuo Hong Yang
Abstract: In this paper, the patchouli oil complex microcapsules were prepared by complex coacervation method, with chitosan (CTS), quaternary ammonium salt of chitosan (HACC) and gum arabic (GA) as the wall materials, patchouli oil as the core materials. The surface morphology of microcapsules was characterized by scanning electron microscopy (SEM).The in vitro release property of patchouli oil from microcapsules was measured by UV–visible spectrophotometer. The results showed that the shapes of microcapsules were spherical, and the diameters of microcapsules were mostly 3-9 μm. The entrapment efficiency and drug loading of microcapsules were 60.6%and 20.2% respectively. The release effect of microcapsules could be influenced by the temperature of the release medium.
Authors: Xiao Li Liu, Wan Cui Xie, Xi Hong Yang, Chao Hua Zhang
Abstract: The paper highlighted the response surface methodology (RSM) which was used to optimize the adsorption technology of Chitosan (CTS) with Paralytic Shellfish Poisoning (PSP) in this paper. The selection of Box-Behnken design and implication of response surface analysis was justified on the basis of single factor (pH, time, temperature, the volume of CTS) experiment. After analyzing the result statistically, it has been proven that the linear and quadric terms of these four variables had significant effects. By using Design Expert (7.1.6) software the predictive quadratic equations model was developed. It can be concluded from the results that the optimum adsorption conditions were pH 3.42, time 88.72 min, temperature 39.66 °C, the volume of (2%) CTS 3.21 mL. Maintaining the above mentioned conditions, the predicted yield of adsorption was found 91.57% with the optimized procedure; while the practical yield of adsorption was 90.32%, which indicate a good fitness of the regression model and actual process.
Authors: Hua Xu, Qian Ning, Da Hu Yao, Yu Xin He, Yu Qing Zhang
Abstract: Novel interpenetrating polymer networks (IPNs) of Polydicyclopentadiene/Polystyrene (PDCPD/PS) were prepared by in-situ polymerization using Ziegler-Natta and peroxide as double catalytic systems. The structure of PDCPD/PS alloy was characterized by Soxhlet extraction, infrared spectrum (IR) and scanning electron microscope (SEM). The results showed that the polymerization of dicyclopentadiene (DCPD) was facilitated in the presence of styrene and the rate of polymerization as well as the conversion of PDCPD was improved with styrene content. The strong IR absorption peaks of PS indicated high penetration of PS within PDCPD networks, and in the process forming IPNs. There were no obvious traces of PS in the alloy brittle fracture, which prepared in liquid nitrogen and was etched by toluene. This result also demonstrated that PS was dispersed in molecular level in the polymer alloy networks and it tangled with PDCPD. The measurements mechanical properties showed that the tensile strength of the polymer alloy was improved with styrene content. This may be due to homogeneous dispersion of PS in the IPNs. The synergistic effect of PS and PDCPD also played a part in enhancing the mechanical properties of polymer alloy.
Authors: Su Xi Wu, Rui Xin Liu, Hui Li, Min Ji
Abstract: The crystal behaviors of lard- based and palm oil-based shortenings manufactured under different crystallization conditions were studied and compared, by using X-ray diffraction method, in order to decide whether lard can be replaced with cheaper palm oil for the production of shortening. The results showed that lard-based shortenings all exhibited β-type of crystal structure under tested crystallization conditions, whereas those shortenings based on the palm oil or the blend of palm stearin with palm olein presented β-type crystals under the maturation temperature of 20°C and β’-type crystals under the maturation temperature of 25°C~28°C. This study demonstrated that lard-based shorternings do not have β’-type crystal structure, a key character for the production of high quality shortening, and palm oil (including palm stearin and palm olein) is more suitable than lard when used as a solid fat material for the manufacture of shortenings.
Authors: Hui Qing Xue, Zong Cai Deng
Abstract: Engineered cementitious composites (ECC) has good ductility, with its unique strain hardening and multiple cracking characteristics. Through the research of uniaxial direct tension performance and durability tests of ECC blending with polyvinyl alcohol (PVA) fiber, the tensile stress-strain curves, the freeze-thaw resistances and the impermeability of ECC were analyzed. The tensile stress - strain curve results show strain hardening of ECC achieved under the uniaxial tensile load; PVA fiber has good crack resistance toughening effect, can significantly improve crack resistance and deformation capacity of cementitious composites. The maximum tensile strain of the ECC is between 3800με to 8657με (20-50 times that of polypropylene fiber concrete) displays high toughness and large deformation characteristics. The freezing level of the ECC is higher than F300, which is ideal for the maintenance and reinforcement of concrete structures in cold regions. Domestic and imported PVA fiber can significantly improve the impermeability and crack resistance of the ECC.
Authors: Yong Fu Li, Yi Ming Ha, Le Ren Tao, Yan Jie Li, Feng Wang
Abstract: Simultaneous radiation grafting method(60Co γ as radiation source)was used to prepare xanthan gum - graft - N-Vinypyrrolidone (XG-g-NVP). FT-IR spectra showed that grafting reaction occurred in NVP Vinyl part and lactam structure was retained. Thermo gravimetric analysis showed that, XG-g-NVP enhanced thermal stability of xanthan gum. XRD showed the crystallinity increased after grafting. At the grafting yield of 623%, XG-g-NVP had the maximum adsorption capacity of phenol and TP, the adsorption amount of which were 0.76 g/g and 2.85 g/g respectively. PH value had the different effects on the adsorption of phenol and tea polyphenols by XG-g-NVP.
Authors: Tao Zhao, Lin Ma, Jing Jun Du, Liang Zhang, Xiao Yan Wu
Abstract: The purification effects of six macroporous adsorption resins on total anthocyanins of hulless barley were compared. The results showed that XAD7HP was the best resin for purification of hulless barley anthocyanins due to its excellent adsorption and desorption capability. The optimal technological parameters were: the pH of sample solution was 3.0, the concentration of sample solution was 21.6 mg/L, the adsorption flow velocity was 1.0 mL/min, the eluting velocity is 1.0 mL/min, and the eluent was about 6.6 bed volumes of 80% ethanol. Reutilization test showed that the XAD7HP resin could be used repeatedly with no significant change of adsorption rate (P>0.05). After purified with XAD7HP, the color value of hulless barley anthocyanins was 41.1, increasing 9.1 times than that of raw extraction.
Authors: Yan Ping Zhang, Hui Yun Zhou, Ling Juan Jiang, Zhong Dong Wang
Abstract: This study was carried out to find material basis of which effect germination rate of Salvia miltiorrhiza Bge seeds in different years and in different areas. The results can be used in quality identification and advising storage conditions. Routine method were used to study the basic qualities, such as physical purity, weight of 100 seeds, seed moisture and germination. GC-MS were used to detect fatty acids and UV spectrophotometer was used to detect reducing sugar. The germination and viability of new seeds were much higher than that of aged. Weight of 100 seeds, seed moisture, fatty acids of same origin new seeds were higher than that of aged. However there was no correlation between different areas. Content of reducing sugar of same origin new seeds were higher than that of aged, also there were no correlation between different areas. Unsaturated fatty acids content of the new seeds was 80.90% which was much higher than that of aged. Linoleic acid was the main Unsaturated fatty acids. Saturated fatty acid content was 19.10% which was much lower than that of aged. Palmitic acid was the main saturated fatty acids. Data showed that unsaturated acids were auto oxidized to saturated acids in the process of storage. Germination rate was decreased as storage time prolonged.
Authors: Yong Ying Jia, Lei Zhang
Abstract: According to the rich heat resources of sewage waste in gathering and transferring of oil-gas of Liaohe Oil Field and the supply water temperature in the heater is over 70°C in the building, proposed the idea of using heat pump air conditioning system that the high temperature source can be used in Liaohe Oil Field sewage-source; gave the design scheme, analyzed and evaluated of its energy usage. The evaluation results indicate that heat pump is feasible and has great energy-saving and environmental benefits great.

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