Win Market by Brand

Brand is symbol of product quality and strength of enterprise.As a typical culture in market economy,it has great influences in everyday life.Famous brands attract purchasing,which prospers enterprise.After China‘s entry to WTO,Chinese economy has turned into a new page,As the world manufacturing base,China is to win international market with its own brands,Chunsheng Refractory Ltd.which specialized in quality silica bricks,has grown in size and strength.And our experiences proved how important the brand is for an enterprise.     

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立式磨是利用料床粉碎原理进行粉磨物料的一种高效粉磨设备,随着预分解窑工艺规模日益增大,对粉磨设备大型化要求随之提出。Atox-50立磨台时产量达410t/h,完全符合要求。但是,Atox-50立磨美中不足的是操作时振动大,对设备的使用寿命、生产的成本、企业的经济效益有很大影响。经     

Highly Site-Selective Epoxidation of Polyene Catalyzed by Metal–Organic Frameworks Assisted by Polyoxometalate

Ectropis obliqua Prout is one of the most severe defoliator insects of tea plants. Sex pheromones method has been widely used for monitoring and controlling the insect pest of E. obliqua Prout due to their relative safety, low cost, and environmental friendliness. However, conventional preparing sex pheromones of E. obliqua Prout has been criticized by the costly and/or low efficiency procedure. Herein, we report a series of Fe-based metal–organic frameworks (MOFs) as efficient heterogeneous catalysts for the site-selective epoxidation of 3Z,6Z,9Z-octadecatriene to its monoepoxides. Particularly, MIL-100(Fe) combined with polyoxometalate (POM) as cocatalyst appears as the best catalyst for the oxidation of 3Z,6Z,9Z-octadecatriene to a high site selectivity to the corresponding 6,7-epoxide with good yields. 3Z,6Z,9Z-octadecatriene and its corresponding 6,7-epoxide are the primary sex pheromone components of the E. obliqua Prout. Significantly, the field bioassay experiments showed that the mixed products were highly effective in attracting E. obliqua Prout male moths. This work provides a general method to fast and clean synthesis of sex pheromones and opens new avenues for the application of Fe-based MOFs in the pest control with environmental friendliness.     

Corrosion protection by zirconia-based thin films deposited by a sol–gel spin coating method

This paper focuses on the structure and corrosion behavior of 316L stainless steel coated by inorganic ZrO₂, hybrid ZrO₂–PMMA, and combined inorganic–hybrid films. The coatings were deposited by a particulate sol–gel spin-coating route, using carboxymethyl cellulose as a nanoparticle dispersant. The electrochemical evaluations were conducted in a simulated body fluid, via potentiodynamic polarization and impedance spectroscopic experiments. According to the results, the hybrid coating presented a better corrosion protection compared to the inorganic coating, due to a lesser density of structural defects. However, the best corrosion resistance was found for a combined coating which consists of an inorganic bottom layer and a hybrid top layer, due to a desirable compromise of good adhesion and low defect density.     

TianLi Was Picked up by Express

Project proposals for construction ofPetroChina Xinjiang Dushanzi Petro-chemical Company 10 million t/a oil re-fining project and 1.2 million t/a ethyl-ene project were approved officially bythe State Council,indicating that the stra-tegic plan to construct China's 21 cen-tury energy source substituting bases inXinjiang took a key step forward. Situated also in Xinjiang region,TianLi High & New Tech Co.,Ltd.willbe the major beneficiary of the petro-chemical project.Firstly TianLi is ex-pected to invest in alone or hold equity     

Reformation of Listed Companies by Sinopec

Yanshan Petrochemical Company,Ltd.has recently transferred all the equity itholds in Yanhua High-Tech(000609).Furthermore,another listed company inSinopec Corp.has completed assetreformation.According to market     

Oxidation of Aliphatic and Benzylic Alcohols by Oxone®, Catalysed by 12-Tungstocobaltate (II)

$R_1 R_2 CH_2 OH\xrightarrow[{50\% {\text{ }}Aqueous{\text{ }}acetonitrile}]{{[Co^{II} (W_{12} O_{40} )]^{6 - } /Oxone}}R_1 R_2 CHO$ A Keggin-type polyoxometalate (POM) 12-tungstocobaltate (II) ([Co^II(W₁₂O₄₀)]^6?) has been used as a catalyst for the oxidation of aliphatic and benzylic alcohols to the corresponding carbonyl compounds. The reduced (POM) formed in the oxidation of alcohols is re-oxidized by potassium peroxomonopersulphate.     

Synthesis of enhanced biosurfactant by Bacillus subtilis MTCC 2423 at 45°C by foam fractionation

Production of a lipopeptide surfactant in a 6.5-L batch fermentor was carried out using Bacillus subtilis MTCC 2423 at 45°C. A good yield was obtained from sucrose (2%) substrate fermentation by continuous removal of the product by foam fractionation. The biosurfactant was recovered from collapsed foam by acid precipitation. The biosurfactant yield (4.5 g/L) was about 4.5 times higher than the yield (ca. 1 g/L) obtained by shake-flask fermentation. Surface activity of the collapsed foam was very high, and total surface activity was observed in the collapsed foam. The structural characterization of this biosurfactant produced at 45°C by the strain used in this study was recently reported. The biosurfactant was analyzed by thin-layer chromatography, infrared, ¹H nuclear magnetic resonance, and mass spectroscopy and was found to be identical to surfactin, a lipopeptide surfactant.     

Acidity of Zeolite Y—Probed by Adsorption of 1-Naphthylamine and Studied by Laser-Induced Fluorescence Spectroscopy

Proton transfer reactions between zeolite Y surface and 1-naphthylamine (NA) in the ground and excited states have been studied by laser-induced picosecond spectroscopy. The acidic form of zeolite Y readily protonates NA in the ground state. At low acid strength of the zeolite the excited state of the protonated NA transfers back the proton to the zeolite surface as indicated by the fluorescence spectra. At high acid strength of the zeolite the fluorescence comes from the protonated form of NA and from an adduct X previously found in highly concentrated HClO₄ solutions. The concentrations of the protonated NA and X increase with the reduction in the unit cell size. The presence of these species is discussed in terms of the next nearest neighbor NNN theory of zeolite Y acidity and the role of the non-framework aluminum. The acidity of the zeolite is estimated, based on the fluorescence lifetimes of X, to vary from 3.7 to 17 M HClO₄ depending on the unit cell size. Low loading levels of NA in the zeolite pores are best in studying the proton transfer reaction and for the estimation of the surface acidity of zeolite Y.     

Separation of Quercentin by Pre-dispersed Solvent Extraction

Pre-dispersed solvent extraction (PDSE) was used to extract quercentin from its diluted solution. The influences of temperature, phase volume ratio (PVR), concentration of sodium Dodecyl benzene sulphonate and pH value etc. on the extraction efficiency were examined. It is found that, compared with traditional extraction techniques under the same condition, a higher extraction productivity can be obtained by PDSE. The stability of colloidal liquid aphrons plays an important role in this process. In a certain scope, the extraction efficiency increases with PVR. Excessive amount of solvent is not much helpful. A new analytical method by using ultraviolet spectrometer to determine the concentration of quercentin is established.     

Actinide–lanthanide co-extraction by rigidified diglycolamides

Within the actinide and lanthanide co-extraction strategy, three rigidified diglycolamides, namely 2,6-bis (N-dodecyl-carboxamide)-4-oxo-4H-pyran (1), 2,6-bis-[N-(4-tert-butylphenyl)carboxamide]-4-oxo-4H-pyran (2), 2,6-?bis[(N-docecyl-N-methyl)carboxamide]-?4-methoxy-?tetrahydro-pyran (3), were synthesized. Moreover, the effect of structural rigidification on Am(III) and Eu(III) extraction under different conditions was investigated. The carboxamide extractant 3 resembles the extracting behavior of N,N,N′,N′‐tetraoctyl diglycolamide (TODGA) in terms of efficiency and affinity within the lanthanide family, together with fast kinetics and satisfactory cation back-extraction. The presence of 1-octanol in the diluent mixture strongly affects the ligand stability. Moreover, despite the low extraction efficiency showed by 1 and 2, all the three ligands exhibit a higher affinity for Am with respect to TODGA, resulting in a lower lanthanide/Americium separation factor, of around 4 for ligand 3 and close to 1 for ligands 1 and 2.     

Can ferrroelasticity be evaluated by nanoindentation?

The present study investigated the possibility of evaluating ferroelastic mechanical characteristics by spherical indentation. Finite element simulation of spherical indentation, with a relatively large sphere, of a ferroelastic-plastic material was performed using characteristic bulk data of a typical ferroelastic oxide (LaSrCoFeO). The simulation results showed that the ferroelastic mechanical behaviour cannot be observed in the indentation load vs depth curve, but is clearly observable in the indentation stress vs indentation strain curve, which can be obtained reliably in experiments by estimating the contact radius using load-partial unloading sequences. The method can be reliable when the indentation stress is under the upper ferroelastic critical stress. Therefore, in principle ferroelastic mechanical characteristics could be evaluated by spherical indentation by obtaining the indentation stress vs indentation strain curve using partial unloading to estimate the contact radius, although the requirements are very difficult to satisfy in actual experiments.     

Separation of Proteins by Electrophoretic Affinity Chromatography

A new kind of electrophoretic affinity chromatography (EAC) for bioseparation was proposed,Separation by EAC was conducted in a multicompartment electrolyzer in which the affinity gel media were packed in one of the central compartments.The presence of an electric field accelerated the migration of proteins inside the gel matrix during adsorption and descrption processes,This led to the increase of the overall speed of separation,The present study was focused on the effect of the strength of the electric field on adsorption and desorption processes.     

Graphite Surface Modification by Heterogeneous Nucleation Process

1IntroductionIn recent years,surface modification on the inor-ganic particles has been a very hot research subject inthe field of material science and surface and interfacescience.The heterogeneous nucleation method is avery applicable technical process[1…     

Oligomerization of α-octene catalyzed by zeolites

The oligomerization of octene-1 was studied in the presence of zeolites of different structural types (e.g., Y, Beta, ZSM-12, and ZSM-5). It was shown that at 150–200°C, wide-pore zeolite catalysts Y, Beta, and ZSM-12 exhibit high catalytic activity in the reaction. The conversion of catalyzed octene can be as high as 96%, and the yield of oligomers is 88–100 wt %. Zeolite ZSM-5 at 150–180°C has low activity and mainly catalyzes the isomerization of octene-1. As the temperature rises to 250°C, low molecular weight oligomers resulting from the cracking process are the main products of this reaction. The activity and selectivity of zeolite catalysts in the oligomerization of octene-1 are conditioned by their acidic properties and structural characteristics, as well as by the reaction conditions. It was revealed that the main oligomerization products are octene dimers having an alkylnaphthene structure and containing unsaturated hydrocarbons with tri- and tetra-substituted double bonds in amounts of 2.2–3.2%. The properties of the octene oligomers synthesized in the presence of zeolite Beta are similar to the characteristics of hydrogenated poly-α-olefins, the oligomerization of which was performed on AlCl₃ complexes.     

Phosphorus Recovery by Liquid–Liquid Extraction

Abstract

It is acknowledged that phosphorus removal is more crucial in comparison with nitrogen removal for preventing algae glooming and eutrophication. Chemical and biological methods are common methods for the P removal. Excessive sludge production and difficulties of recovering phosphorus are concerns in terms of sustainable waste management. A liquid-liquid extraction (LLE) process is thus considered for the study aiming at recovering phosphorus from wastewater in a sustainable way. The results revealed that the best extractant is a mixture of kerosene and benzyl-di-methyl-amine (BDMA) at a volume ratio of 2:1. Under the study conditions, one part of extractant can react with four parts of wastewater to transfer >97% of P to the organic phase. In addition, in the stripping step, a 1:1 ratio of extract to recycled acid can result in 96% recovered P, implying an overall 93% phosphorus recovery efficiency can be achieved by the LLE process. Most importantly, the extractant can be recycled and reused at least 5 times if the residual P concentration should be less than 4 mg/L vs. the original P concentration of 21 mg/L. A complexion between amine groups in BDMA and phosphates and the positive charge of the micelles surface when the extractant (composed of kerosene and BDMA) mixed with P containing wastewater would contribute to the P recovery and this is a novel approach to recover P from wastewater.     

Extraction of cadmium by TODGA–dodecane and TBP–dodecane: A comparative study by MD simulation

Molecular dynamics (MD) simulation of [Cd(II)] along with nitrate ions and water in dodecane was carried out for different nitric acid concentrations. The extraction process using N,N,N’,N’-tetraoctyldiglycolamide (TODGA) and tributyl phosphate (TBP), in biphasic systems, is also simulated at three nitric acid concentrations. In the TBP-based system, the formation of a third phase was observed at 3 M nitric acid concentration. Cd(II) ions form reverse micelles-like clusters with TODGA as an extractant in dodecane. The mass percentage of TODGA in these clusters decreases with increase in the acid concentration while increasing the size of the aggregates at the same time.     

Separation of 4’-demethyldeoxypodophyllotoxin from Sinopodophyllum emodi by medium-pressure LC and high-speed counter-current chromatography guided by HPLC-MS

A minor lignan, 4ˊ-demethyldeoxypodophyllotoxin, was isolated from Sinopodophyllum emodi. First, a crude extract of S. emodi was analyzed by high performance liquid chromatography-mass spectrometry (HPLC-MS) to confirm the presence of the target compound. Then, the target lignan was successfully enriched in the crude extract precipitate by medium-pressure LC (MPLC) with high recovery (85%). Finally, an efficient separation was achieved by high-speed counter-current chromatography (HSCCC) using a two-phase solvent system of n-hexane-ethyl acetate–methanol–water (1:1:1:1, v/v/v/v). These results clearly demonstrate that the combination of HPLC-MS, MPLC, and HSCCC could be a powerful technique for the rapid screening, enrichment, and separation of minor compounds from complex natural products.     

Structural basis of Bcl-xL recognition by a BH3-mimetic α/β-peptide generated by sequence-based design

The crystal structure of a complex between the prosurvival protein Bcl-x(L) and an α/β-peptide 21-mer is described. The α/β-peptide contains six β-amino acid residues distributed periodically throughout the sequence and adopts an α-helix-like conformation that mimics the bioactive shape of the Puma BH3 domain. The α/β-peptide forms all of the noncovalent contacts that have previously been identified as necessary for recognition of the prosurvival protein by an authentic BH3 domain. Comparison of our α/β-peptide:Bcl-x(L) structure with structures of complexes between native BH3 domains and Bcl-2 family proteins reveals how subtle adjustments, including variations in helix radius and helix bowing, allow the α/β-peptide to engage Bcl-x(L) with high affinity. Geometric comparisons of the BH3-mimetic α/β-peptide with α/β-peptides in helix-bundle assemblies provide insight on the conformational plasticity of backbones that contain combinations of α- and β-amino acid residues. The BH3-mimetic α/β-peptide displays prosurvival protein-binding preferences distinct from those of Puma BH3 itself, even though these two oligomers have identical side-chain sequences. Our results suggest origins for this backbone-dependent change in selectivity.