Advanced Materials Research Vols. 881-883

Abstract: This paper studied the effect of strong acid---concentrated sulfuric acid---on organic phase physical properties, copper extraction rates as well as phase behaviors in the process of copper solvent extraction. Results demonstrate that with the increase of contact time between organic phase and concentrated sulfuric acid, the organic phase density and viscosity slightly decreased, copper extraction rate linearly decreased from 99.8% to 99.5%, and the average size of organic phase droplet in raffinate cyclically trended to decrease. When the contact time is less than 20 hrs, phase disengagement rate decreased slowly. However, further increasing the contact time the phase disengagement rate decreased rapidly. Organic phase physical properties have little effect on phase disengagement rate.

Abstract: The purpose of this paper is to investigate the effect of osmotic pressure on the morphology of emulsion liquid membrane (ELM) by the visual way. The experimental results show that osmotic pressure has great effect on the globules of emulsion liquid membrane through water diffusion between two water phases. When under isotonic pressure, the water transport trend cannot be observed. When osmotic pressure is less than zero, water transfers from the internal phase to the external phase. But when osmotic pressure is larger than zero, water transports from the external phase to the internal phase first by diffusion, then water transports from the internal phase to the external phase by the coalescence. Therefore, it is possible to tailor osmotic pressure between two water phases to keep the stability of emulsion liquid membrane when ELM is used to separate some component.

Abstract: A highly convergent formal synthesis of Ieodomycins A and B was achieved in 7 steps. The key features involved in the synthetic sequence of Ieodomycins A and B are the Sharpless asymmetric epoxidation and the Mukaiyama aldol reaction^[. The synthesis of C-3 epimer of Ieodomycins A and B was also accomplished in good yields, but now just Heptyl diene aldehyde was getted thought 4 steps. Use Geraniol as meterials to make the corresponding aldehyde (1) via Swern oxidation. Though epoxidation, Wittig reaction and HIO₄ oxidation to get the intermediate . Useing it though few steps, the target molecule can be getted.

Abstract: This paper was to develop a simple and rapid headspace solid-phase microextraction (HS-SPME) method coupled with gas chromatography–mass spectrometry (GC-MS) for the determination of volatiles compounds from the roasted sesame oil (RSO). A HP-5MS capillary column (30 m × 0.25 mm I.D. × 0.25 mm film thick) was used for GC-MS, and a 50/30 μm divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) fiber was used to extract volatiles compounds. The condition was optimized by varying the sample-to-headspace ratio (0.5-2.5 g/15 ml), extraction time (10-50 min) and Splitless time (0.5-4 min). The results showed that the optimal operating conditions occurred at (extraction temperature:40°C, sample-to-headspace ratio: 1.5 g/15 ml, extraction time: 40 min, Splitless time: 1 min) for the analyze method.

Abstract: A new method for the determination of Gemifloxacin (GMFX) by using Resonance Rayleigh scattering was put forward. In HAc-NaAc buffer solution of pH 5 - 6, terbium (III) and antibiotics GMFX could form cationic complexes, which coulf further form 1 :2 : 1 (Tb3+ : GMFX :AR) ternary ion association complexes by the reaction with Alizarin Red (AR) anion through electrostatic and hydrophobic interaction. The new Resonance Rayleigh scattering (RRS) spectra would appear, and the two scattering peaks were located at 370nm and 590 nm. At 370 nm, the scattering enhancement (ΔI) was proportional to GMFX of certain concentration and its linear range and detection limit (3σ) were 0.005 ~ 4.00 μg.mL^-1 and 14.5 ng.mL^-1. This method is simple, fast, with good selectivity and reproducibility, and it can be used for determination of GMFX drug in various body fluids.

Abstract: The application of high purity phosphoric acid in industrial production is more and more widely used, especially electronic grade phosphoric acid, and the demand of it has risen year by year. This paper introduces the preparation and research advance of electronic grade phosphoric acid, expounds the principle, advantages and disadvantages and research advance of preparing high purity phosphoric acid by high purity phosphorus oxidation method and phosphoric acid purification method. Using hot process by direct method to prepare high purity electronic grade phosphoric acid is still the mainstream on the current, and the key of technique is the purification of yellow phosphorus and phosphoric acid.

Abstract: Double maleamic acid (DMA) was synthesized with maleic anhydride and ethylenediamine in this paper, and its lanthanide metal complex (LMC) was synthesized in aqueous solution with lanthanum chloride (LaCl).The reaction conditions and the product were determined by UV absorption spectrum, IR spectrum and element analysis. The results showed that the product is La (OH)[C₁₀H₁₀O₆N₂]·2H₂O. And it is the structural formula of speculation. Congo red experiments show that the thermal stability of PVC product was improved significantly after blending with Poly Vinyl Chloride (PVC) and LMC. The thermal stability time can be up to 20 minutes.

Abstract: In this paper, the activated sludge from liquor-making factory was domesticated by adding the Yellow water to simulate wastewater, and the well-treated activated sludge was used to deal with the wastewater from liquor-making factory. The results show that: compared with the activity of activated sludge with appropriated addition of the Yellow water or not, the activated sludge, which was acclimated with the Yellow water, can increase the capability of activated sludge in dealing with wastewater. Through 16-hour cycle reaction system with the well treated activated sludge, COD of liquor wastewater was decreased to 95mg/L, and at the same time Polyhydroxybutyrate can accumulate about 33.2% of DCW.

Abstract: The emulsion of chitosan in acetic acid aqueous and poly lactic acid in chloroform was spray-dried to obtain the chitosan/poly lactic acid microencapsules (CS-PLA). The polypyrrole / chitosan/ polylactic acid microencapsules were prepared by polymerization pyrrole on CS-PLA. The structures and the morphologies of microencapsules were characterized by FTIR, SEM, TGA and four probes technique. The results showed that multilayer polypyrrole were formation on the surface of CS-PLA microencapsules, the microencapsules had 3.0-8.0 μm diameters with smooth surface, and the electrical conductivity value was 1.03×10^-3 S/cm.

Abstract: The hydriding behavior of as-quenched U-5.5Nb alloy followed by 400 °C×3h aging treatment has been studied at 100 °C with the hydrogen pressure specially chosen at 1.0 bar. The pitting and initial growth of hydride was in-situ monitored by hot stage microscope. The morphology and positions of hydrides on sample surface were then carefully studied by the laser scanning confocal microscope (LSCM) and scanning electron microscope (SEM) which were also applied for investigating the microstructure changes before and after the aging treatment. It is clearly found that the acicular phase all over the metal matrix caused by the 400 °C, 3 hr heat-treatment determined the preferential growth of the hydride in specific directions.