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Recycle use of phosphorous mixer extractant to extract indium

Rare Metals 2003年第2期22卷 91-94页

作者： XU Xiulian, XU Zhifeng, and ZHOU FayingFaculty of Material and Chemical Engineering, Southern Institute of Metallurgy, Ganzhou 341000, China (Received 2002-01-30) Faculty of Material and Chemical Engineering Southem Institute of Metallurgy Ganzhou 341000

The stripping and regeneration of the loaded organic phase of phosphorousmixer extractant (PPD) were studied. The mixed solutions (3 mol/L HCl +2 mol/L ZnC1_2) were used asthe stripping agent and more than 99 percent of indium can be stripped after three-stage strippingwhen the volume ratio of organic phase to stripping agent is 1:1. The organic phase can he recycledto use alter regeneration with HCl. The parallel contrast experiments with D_2EHPA (di-2-ethyl hexylphosphoric acid) were carried out under the same conditions. The results show that the mixerextractant has good reusability and the stripping and regeneration of PPD are superior to those ofD_2EHPA.

关键词： hydrometallurgy solvent extraction single-factor experiment indium phosphorous mixer extractant (PPD)

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Optimization of Preparation of Fe_(3)O_(4)-L by Chemical Co-Precipitation and Its Adsorption of Heavy Metal Ions

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Journal of Renewable Materials 2023年第5期11卷 2209-2232页

作者： Junzhen Di Xueying Sun Siyi Zhang Yanrong Dong Bofu Yuan College of Civil Engineering Liaoning Technical UniversityFuxin123000China

To address the serious pollution of heavy metals in AMD,the difficulty and the high cost of treatment,Fe_(3)O_(4)-L was prepared by the chemical co-precipitation *** on the single-factor and RSM,the effects of particle size,total Fe concentration,the molar ratio of Fe^(2+)to Fe^(3+)and water bath temperature on the removal of AMD by Fe_(3)O_(4)-L prepared by chemical co-precipitation method were *** adsorption experiments were conducted on Cu^(2+),Zn^(2+)and Pb^(2+)using Fe_(3)O_(4)-L prepared under optimal conditions as *** adsorption properties and mechanisms were analyzed by combining SEM-EDS,XRD and FTIR for *** study showed that the effects of particle size,total Fe concentration and the molar ratio of Fe^(2+)to Fe^(3+)are *** by response surface optimization analysis,the optimum conditions for the preparation of Fe_(3)O_(4)-L were a particle size of 250 mesh,a total Fe concentration of 0.5 mol/L,and a molar ratio of Fe^(2+)to Fe^(3+)of 1:*** these conditions,the removal rates of Cu^(2+),Zn^(2+),and Pb^(2+)were 94.52%,88.49%,and 96.69%*** adsorption of Cu^(2+),Zn^(2+)and Pb^(2+)by Fe_(3)O_(4)-L prepared under optimal conditions reached equilibrium at 180 min,with removal rates of 99.99%,85.27%,and 97.48%,*** adsorption reaction of Fe_(3)O_(4)-L for Cu^(2+)and Zn^(2+)is endothermic,while that for Pb^(2+)is ***_(3)O_(4)-L can still maintain a high adsorption capacity after five cycles of adsorption-desorption ***^(2+),Zn^(2+)and Pb^(2+)mainly exist as CuFe_(2)O_(4),Zn(OH)2,ZnFe_(2)O_(4)and PbS after being adsorbed by Fe_(3)O_(4)-L,which is the result of the combination of physical diffusion,ion exchange and surface complexation reaction.

关键词： Chemical co-precipitation Fe_(3)O_(4)-L single-factor experiment RSM adsorption characterization

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Ultrasonic assisted natural deep eutectic solvents as a green and efficient approach for extraction of hydroxytyrosol from olive leaves

Industrial Chemistry & Materials

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Industrial Chemistry & Materials 2024年第2期2卷 309-320页

作者： Mingming Hu Bao Han Lin Xie Beibei Lu De Bai Nuo Shi Ya Liao Yan Wang Ling Liu Shaojun Wu Runrui Lan Xiaomei Lei Ci Shi Danhua Huang Yuanbin Li Lin Lin Jiaheng Zhang Sauvage Laboratory for Smart Materials Harbin Institute of Technology(Shenzhen)Shenzhen 518055P.R.China Research Centre of Printed Flexible Electronics School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055P.R.China Shenzhen Shinehigh Innovation Technology Co. LtdShenzhen 518055P.R.China Shanghai Corday Biotech.Co. LtdShanghai 200000P.R.China

In this study,an ultrasonic assisted natural deep eutectic solvent(DES)was used to extract hydroxytyrosol(HT)from olive *** optimal extraction conditions of the MaPa-4 concentration,extraction time and solid-liquid ratio were obtained by single factor *** formation mechanism of MaPa and its interaction with HT were analyzed by FTIR,^(1)H-NMR and density functional theory(DFT)***,MaPa-4 and water extracts obtained under the optimal extraction conditions were selected for a series of efficacy ***-4 extract demonstrated low cytotoxicity,good biocompatibility,and excellent antiinflammatory and bacteriostatic ***,MaPa-4,as an environmentally friendly and efficient solvent,was combined with ultrasound treatment to develop an efficient,green and feasible method to extract HT from olive leaves.

关键词： Hydroxytyrosol Deep eutectic solvent single-factor experiment Bacteriostatic Antiinflammatory Antioxidant

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GRA-Based Approach to PID Parameter Tuning for Closed-Loop Servo Systems

GRA-Based Approach to PID Parameter Tuning for Closed-Loop S...

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第25届中国控制与决策会议

作者： PENG An-hua Engineering Training Center Huaihai Institute of Technology

ISBN: (纸本)9781467355339

Performances of servo system are the key factors, which determine the best process accuracy and efficiency that computer-numerical-control （CNC） machine tools can reach, and therefore it is absolutely necessary to conduct dynamic simulation and to design a corrector after static design. PID （proportion-integral-differential）-controller as a correction device is adopted. Overshoot of closed-loop servo system of the machine tool remains still as high as 13.27%, after corrected by proportion-integral-differential （PID） controller, whose parameters are tuned only with critical one fourth attenuation curve. Therefore PID controller parameters merely based on critical oscillation are required to be further optimized by grey relational analysis （GRA） combined with orthogonal experiment, in which controllable factor values are assigned according to the single-factor experiment results, and the two examined indexes, overshoot and rise time, are converted into one index through analysis of grey relational grade. In MATLAB software, a simulation model was created, and the simulation results to unit step response are 3.03% in overshoot and 0.1960 second in rise time, reflecting better dynamic performances, both smoothness and rapidity, and showing that the method is effective.

关键词： Servo System PID single-factor experiment Orthogonal experiment Grey Relational Grade (GRD)

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Optimization of Ultrasonic Extraction Process of Polysaccharides from Polyporus umbellatus

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Agricultural Biotechnology 2015年第6期4卷 7-9页

作者： Juanjuan DU Mengting LIU Fei LI College of Chemical and Biochemical Engineering Nanjing Normal University Taizhou College

[ Objective] This study aimed to investigate the optimal conditions for ultrasonic extraction of polysaccharides from Polyporus umbeUatus, thus providing a reliable basis for the development and utilization of P. umbellatus. [ Method ] By single-factor experiment, the ultrasonic extraction process of polyperus pelysac- charides was optimized. [Result] The optimal conditions for ultrasonic extraction of polysaccharides from P. umbeUatus were： solid-liquid ratio 1：40 （g： ml）, ex- traction duration 60 rain, extraction temperature 70 ℃, ultrasonic power 100 W. [ Conclusion] Compared with conventional water extraction method, ultrasonic ex- traction could significantly improve the content of polyporus polysaccharides with shorter extraction duration, lower solid-liquid ratio and lower extraction tempera-

关键词： Polyporus umbellatus Polysaccharides Ultrasonic extraction single-factor experiment

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