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| Thesis Name：Effect on fluorine in gas of decomposition course of mixed rare earth preparation concentrate on CaO |
| Country：[CN] |
Usage：[Materials & Metallurgy] |
| Remarks： |
Abstract:
Effect on the content of fluorine in gas of decomposition course of mixed rare earth preparation concentrate on CaO is studied. The content of fluorine is measured by the gas chromatographic analysis method,the results show CaO can absorb the fluorine in the decomposition course of mixed rare earth perparation concentrate,and the 60% content of fluorine in the gas of is absorbed.The result of XRD experiment of roasting production of bastnaesite added 15% CaO shows there is a great deal of CaF2 in the roasting production. This shows the absorbing fluorine mechanism of CaO in the decomposition course of mixed rare earth preparation concentrate is that CaF2 is generated by the chemical reaction of CaO and REOF. |
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| Thesis Name：Solvent-free synthesis of 4H-benzo[b]pyran derivatives catalyzed by NaOAc and PEG400 |
| Country：[CN] |
Usage：[Pharmacy] |
| Remarks： |
Abstract 4H-benzo[b] pyran derivatives were synthesized by one-pot, three-component reaction of aromatic aldehyde, active methylene compounds, and 1,3- cyclohexanedione in good yields using sodium acetate and PEG400 as catalyst under solvent-free conditions.
Cao YuQing, Li YaBin, Wu GuoQiang
(College of Pharmacy, Hebei University, Baoding 071002, China) |
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| Thesis Name：Adsorption behaviors of copper (II) and lead (II) ions by crosslinked starch graft copolymer with aminoethyl group |
| Country：[CN] |
Usage：[Chemistry and Environmental Science] |
| Remarks： |
Abstract:
An investigation was undertaken regarding the adsorption behaviors of copper (II) and lead (II) ions from aqueous solutions by crosslinked starch graft copolymers with aminoethyl groups, which were synthesized by grafting 2-aminoethyl methacrylate onto crosslinked starch. The dynamic adsorption method was utilized to evaluate adsorbability of graft copolymer under various parameters such as metal ion concentration, adsorption time, grafting percentage and adsorption temperature. The adsorption time reaching equilibrium for Cu (II) and Pb (II) was found to be two hours and one hour, respectively. The adsorption capacity increases with the increasing graft percentage and metal ions concentration. For the starch graft copolymer with grafting percentage of 75.5%, when the metal ions concentration was about 5.0 mmol/L, the saturation adsorption capacity of Cu (II) and Pb (II) are 21.05 mg/g and 144.08 mg/g (dry weight), respectively, and its desorption percentage is about 95%.
Deng Kuilin, Jia Na, Zhang Yaqin, Yan Dawei, Hou Duanmin
(College of Chemistry and Environmental Science, Hebei University, Baoding, 071002) |
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| Thesis Name：Analysis of amino acids in medicine by micellar electrokinetic capillary with high frequency conductivity detection |
| Country：[CN] |
Usage：[Chemistry] |
| Remarks： |
Abstract:
The research about the separation and determination of amino acids is submitted. In the optimum separation condition, i, e, running buffer: 1mmol/LSodium Lauryl Sulfate(SDS), 7.5mmol/L sodium dihydrogen phosphat,5mmol/L formic acid, (pH3.8) and the separation voltage 20.5 kV, the baseline separation was obtained in six mines for the five amino acids, phenylalanine, arginine, alanine, glutamic acid, aspartic acid, and the separation efficiency was between 0.72×105and 2.48×105N/m.The high frequency conductivity detection was used in this separation, and its detection mode is a kind of indirect measurement. The more the difference between the buffer and the sample is，the more the detection sensitivity is. In the optimum detection condition, the detection limit for the phenylalanine, arginine, alanine, glutamic acid, aspartic acid, was 0.03，0.63，0.74，2.01and 0.92mmol/L, respectively. This analytical method was used to determination the amino acids in injection, and the analytical result was correspond with certificate.
Xiang Xiaolan1，2 Yu Bin2 He Jinlan1*
(1Department of Chemistry, Zhanjiang Normal College, Zhanjiang 524048; 2College of Sciences, Nanjing University of Technology, Nanjing 21000) |
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| Thesis Name：Optimization of PET staple cross air blow technology |
| Country：[CN] |
Usage：[chemical industry] |
| Remarks： |
Abstract:
The 1.8×104 t/a PET staple cross air blow speed test method was introduced. The defects of instrument plates control were overcome. Suitable cross air blow technology was selected so that it can meet the spinning technology conditions. The main air duct pressure and the ability of withstand outside air speed change was increased so that the speed was steady and even. The cross air blow technology parameters that suitable for Xinjiang area were found. The grey yarn quality was increased.
Source:Polyester Industry
Author:WANG Qing
(Chemical Fiber Plant of Urumqi Petrochemical Co., Urumqi 830019, China) |
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| Thesis Name：Effect of alkali metal catalytic additives on p-Xylene liquid |
| Country：[CN] |
Usage：[chemistry] |
| Remarks： |
Abstract:
The catalytic activities of K+, Na+ alkali metal ions additives in p-xylene liquid phase oxidation system were verified. Multi groups of kinetics experiments were carried out on the catalytic effects of the alkali metal ions under different adding mass fraction. The effect of K+, Na+ adding amount on the system main reaction and combustion side reaction, the effects of 4-CBA content in TA solid product were investigated. The effect principles of alkali metal ions additives on PX oxidation process were obtained. The experiments showed that the adding amount of alkali metal ions had different effects on the degree of activity. The main reaction can be accelerated efficiently as the adding mass fraction of K+ was (30～100)×10-6.The catalytic effects were not obviously or even inhibited when the adding amount was so big. Compared with K+ ,the catalytic activities of Na+ on the main reaction was much lower.
Source:Polyester Industry
Author:LUO Xiao- fang1, CHENG You- wei1, SONG Jing- zhen2 , LI xi1
(1.Chemical Engineering Department of Zhejiang University, Hangzhou 310027,China;2.Dalian Synthetic Fiber Research Institute Co.Ltd., Dalian 116021,China) |
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| Thesis Name：China PTA industry enter into an important development stage |
| Country：[CN] |
Usage：[chemical industry] |
| Remarks： |
Abstract:
With the rapid development of China PET and its fiber industry, the inadequate PTA problem becomes obviously day by day. In recent years, many large scale PTA plants were built and put into production in succession. The production capacity and output of PTA was largely increased. The plant capacities and factory scales were enlarged rapidly. The production base was formed. The investment channels were multivariate. The technology became ripe gradually. The product quality was improved steadily. China PTA industry has entered into an important development stage.
Source:Polyester Industry
Author:WANG De-cheng
(China Textile Industrial Engineering Institute, Beijing 100037,China) |
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| Thesis Name：Finite element analysis of large scale PTA steam pipe rotary dryer |
| Country：[CN] |
Usage：[chemistry] |
| Remarks： |
Abstract:
The three dimensional finite elements model of China autonomous design PTA dryer was built with ANSYS program. By the calculation, the stress tenacity and displacement distribution cloud charts of the dryer under different working loads were obtained. The tenacity and stiffness conditions of the autonomous design PTA dryer can meet the requirement.
Source:Polyester Industry
Author:XI Jin-chao 1,ZHAO Jun 1, MENG Ling-yan2
(1.College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2.China Textile Industrial Engineering Institute, Beijing 100037,China) |
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| Thesis Name：Dynamic model of flat fiber in melt spinning |
| Country：[CN] |
Usage：[chemical industry] |
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Abstract: According to the basic principle of melt spinning，the dynamic model of flat fiber was deduced in detail. The effect of spinning technology conditions on fiber shaped degree was simulated by using the established model. The simulation results show that the shaped degree is decreasing when the spinning temperature and intrinsic viscosity are increasing；the spinning speed has little effect on the shaped degree when the pump mass throughput is constant; the shaped degree is increasing with the increasing of pump mass throughput when the spinning speed is constant; the cross air blow conditions have much effect on the shaped degree; the scope of shaped degree is increasing when the aspect ratio of spinneret hole is increasing; the shaped degree has obvious decreasing tendency in the small zone of spinning path and this decreasing became gently when the pump mass throughput is increasing.
Source:Polyester Industry
ZHOU Zhao- yun, WANG Hua- ping, WANG Chao- sheng, ZHANG Yu -mei,
ZHANG Chuang -xiong, ZOU Yu
(Center of Chemical Fiber Engineering, Donghua University, Shanghai 200051,China) |
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| Thesis Name：Nitric oxide concentration and fluorescence lifetime in non-premixedatmospheric pressure flames. |
| Country：[CN] |
Usage：[chemistry] |
| Remarks： |
Abstract:
Nitric oxide (NO) is an important combustion pollutant, and understanding NOformation and destruction chemistry requires accurate concentration measurements in geometricallysimple flames. The increasing importance of combustion in non-premixed and partially premixed modesfor power generation and transportation places additional emphasis on experiments under non-premixedconditions.; Nitric oxide concentration profiles along the stagnation streamline were measured withlaser induced fluorescence (LIF) in non-premixed, atmospheric-pressure counterflow flamesstabilized under a semi-cylindrical burner (Tsuji-type). Concentration profiles were measured inpure methane/air flames and flames with NO seeded into the fuel flow at 100- to 600-ppm levels.Several air flow-rates were examined to study the effect of flame stretch. A picosecond-pulsetunable dye laser and microchannel plate photomultiplier tube were used to provide time-resolved LIFsignal under linear (non-saturated) excitation, and fluorescence lifetimes and quenching rates weredetermined by de-convolving the temporal fluorescence signals. Coherent anti-Stokes Ramanspectroscopy was used to measure temperature profiles in the flames; this information was used toextract quantitative species concentration data from the LIF measurements and provide a boundarycondition for kinetic modeling.; Measured peak NO concentrations were between 84 ± 12-ppm(low flame stretch) and 50 ± 8-ppm (high stretch). To evaluate the kinetic mechanisms, theflames were modeled computationally and NO concentrations were calculated. Absolute concentrationpredictions in seeded and unseeded flames were accurate to within the error imposed by uncertaintyin the “prompt” NO production pathway rate (CH + N2 → HCN + N). However,the models over-predicted the decline in NO concentration with increasing air flow velocity.;Calculated flame species concentrations were coupled with model estimations for collisionalquenching cross sections, and these predicted fluorescence lifetimes were compared to directlymeasured LIF lifetimes. The predictions were accurate within experimental error in the fuel-lean andhigh-temperature regions of the flame. However, the model error in the fuel-rich region of theflame exceeded uncertainty limits; erroneously low model quenching cross sections for H2Oand CO2 could explain the discrepancy, but this possibility has not been fully explored.
Author:Driscoll, James Joshua.
Unit:University of Michigan. |
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