Tag: M.W=300-400

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Equilibria among double sulfates and aqueous solutions of sulfuric acid of various concentrations. I.》. Authors are Montemartini, C.; Losana, L..The article about the compound:Aluminum(III) sulfate xhydratecas:17927-65-0,SMILESS:O=S(O)(O)=O.O=S(O)(O)=O.O=S(O)(O)=O.[H]O[H].[Al].[Al]).Application In Synthesis of Aluminum(III) sulfate xhydrate. Through the article, more information about this compound (cas:17927-65-0) is conveyed.

Because of the lack of systematic data in the literature on the solubility of sulfates in aqueous H2SO4, a study of double sulfate-H2SO4-water systems was begun with a study of the simple systems containing only a single sulfate. The exptl. data include the dilation of Al2(SO4)3.18H2O, Al2(SO4)3.Na2SO4.24H2O, Cr2(SO4)3.K2SO4.24H2O, AlCl3.6H2O, Al(NO3)3.18H2O, Cr(NO3)3.9H2O, Fe2(SO4)3 and Fe2(SO4)3.K2SO4.24H2O solutions as a function of temperature, the time required for such solutions after being heated to return to their original state, as judged by e. m. f. and internal friction determinations, and the solubility of Al2(SO4)3.18H2O, of Al2(SO4)3.Na2SO4.24H2O and of Cr2(SO4)3.K2SO4.24H2O in aqueous H2SO4 of various concentrations Data for all these determinations are given in graphical form.

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Safety of Aluminum(III) sulfate xhydrate. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Aluminum(III) sulfate xhydrate, is researched, Molecular Al2H8O13S3, CAS is 17927-65-0, about Alkaline, mental, and acidic ranges [in papermaking]. Author is Volkel, H.-G.; Weigl, J..

The manufacturing of papers is described under acidic and neutral operating conditions. The fabrication of papers under these conditions is based on the use of Al2(SO4)3.18H2O and CaCO3 as white pigments. The competing reactions of these 2 reagents are described and their advantages and disadvantages for paper production are discussed in relation to the pH value and the wood content of the papers.

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Reference of Aluminum(III) sulfate xhydrate. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Aluminum(III) sulfate xhydrate, is researched, Molecular Al2H8O13S3, CAS is 17927-65-0, about Aluminum effect on lipid peroxidation and on the activities of superoxide dismutase and catalase in the cerebral hemisphere and liver of young chickens. Author is Swain, C.; Chainy, G. B. N..

Al was injected (i.p.) as aluminum sulfate (4, 40, and 100 mg/kg body weight, n = 5 per group) daily into day-old White Leghorn male chickens for 7, 15 and 30 days. Al treatment (100 mg dose) to chickens over 7 and 30 days resulted in a decrease in activities of cytosolic total and CN–sensitive superoxide dismutase (SOD) in the cerebral hemisphere (CH). In the 15-day treated group, activities of cytosolic total, CN–sensitive and CN–insensitive SOD of CH were decreased in response to all Al doses. In the liver, activities of cytosolic total and CN–sensitive SOD were decreased in response to all doses of Al treatment for 7 and 15 days. But 40 and 100 mg doses were effective in decreasing activities of the enzymes in the 30-day treated group. The catalase (CAT) activity of CH of chicks was inhibited by all doses of Al under treatment for 7 days, but was inhibited only in the case of the 100 mg dose when the duration of treatment was increased to 15 days. The inhibition was again observed in chickens treated for 30 days in response to 40 and 100 mg doses . CAT activity of liver was decreased in response to all Al doses in the 7-day treated group and in response to 40 and 100 mg doses in the 15- and 30-day treated groups. Al treatment did not affect lipid peroxide levels of CH and liver of chickens.

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So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Spicer, Patrick T.; Pratsinis, Sotiris E.; Raper, Judy; Amal, Rose; Bushell, Graeme; Meesters, Gabrie researched the compound: Aluminum(III) sulfate xhydrate( cas:17927-65-0 ).Safety of Aluminum(III) sulfate xhydrate.They published the article 《Effect of shear schedule on particle size, density, and structure during flocculation in stirred tanks》 about this compound( cas:17927-65-0 ) in Powder Technology. Keywords: flocculation shear schedule particle size structure. We’ll tell you more about this compound (cas:17927-65-0).

The effect of shear history on the evolution of the polystyrene-alum floc size, d., and structure is investigated by small-angle light scattering during cycled-shear and tapered-shear flocculation in a stirred tank using a Rushton impeller. First, various sampling schemes are exptl. evaluated. The floc structure is characterized by the mass fractal dimension, Df, and the relative floc d. During turbulent shear flocculation, small floc structures are shown to be more open (Df=2.1) than larger floc structures (Df=2.5) as a result of shear-induced restructuring during steady state attainment. Flocs produced by cycled-shear flocculation are grown at shear rate G=50 s-1 for 30 min, are fragmented at Gb=100, 300, or 500 s-1 for one minute, and then are regrown at G=50 s-1. This shear schedule decreases the floc size but compacts the floc structure. When flocs are produced by gradual reduction of the shear rate from G=300 to 50 s-1 (tapered-shear flocculation), smaller though equally dense flocs are produced compared with cycled-shear flocculation. The cycled-shear flocculation method produces the largest flocs with the highest potential for sedimentation when the fragmentation shear rate is Gb=300 s-1.

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Huo, Kaifu; Zhu, Boquan; Fu, Jijiang; Li, Xuedong; Chu, Paul K. published the article 《Large-scale synthesis of mullite nanowires by molten salt method》. Keywords: mullite nanowire molten salt precipitation synthesis property.They researched the compound: Aluminum(III) sulfate xhydrate( cas:17927-65-0 ).Recommanded Product: 17927-65-0. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:17927-65-0) here.

Single-crystalline mullite (3Al2O3·2SiO2) nanowires have been produced in large quantities by a low cost and environmentally benign molten salt synthesis (MSS) method. The raw materials, Al2(SO4)3 and SiO2 powders, react in molten Na2SO4 at 1000 °C to produce mullite nanowires without the use of surfactants or templates. After the synthesis, the remaining salts can be easily separated from the products by washing with water. The final products are characterized by X-ray powder diffraction, field emission SEM, transmission electron microscopy, energy-dispersive X-ray spectroscopy, selected-area electron diffraction, and inductively coupled plasma-at. emission spectrometry. The thermal and chem. behavior of the raw materials is investigated by heating at a rate of 10 °C/min up to 1200 °C in air followed by thermogravimetric and differential scanning calorimetry analyses. The single-crystalline mullite nanowires have diameters of 30-80 nm and lengths from several hundreds of nanometers to micrometers and the growth mechanism is discussed.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Aluminum(III) sulfate xhydrate, is researched, Molecular Al2H8O13S3, CAS is 17927-65-0, about Controlled aggregation of colloidal particles for toner applications, the main research direction is aggregation carboxylated polystyrene colloidal particle coagulant electrophotog toner application.Safety of Aluminum(III) sulfate xhydrate.

Micrometer-sized particles were formed by controlled aggregation of carboxylated polystyrene colloidal spheres having a mean diameter of about 200 nm with a com. cationic coagulant. To identify the parameters governing the size and structure of the aggregates, the aggregate size distribution was studied over a period of time with dynamic light scattering. The effect of the particle concentration, pH, and ionic strength on the aggregation behavior was investigated. The coagulant concentration used for present studies was 5 parts per hundred on the basis of the polystyrene particles and the particle concentrations used were 10-15%. The particle size distribution for the latex suspensions was also investigated with a 10% aluminum sulfate [Al2(SO4)3·14H2O] solution as a model coagulant. With the com. coagulant, aggregation was found to be slower at lower pH than at neutral pH. At pH 6, the particles started to aggregate within minutes and form aggregates of about 1000 nm. The authors expected that lowering the pH would reduce interparticle repulsive forces and enhance the collision efficiency. However, at a lower pH of 2, the aggregation process slowed down. Increasing the ionic strength at neutral pH led to a broader aggregate size distribution, and the population of larger aggregates increased. The suspensions with the model coagulant showed similar behavior. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.

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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Aluminum(III) sulfate xhydrate(SMILESS: O=S(O)(O)=O.O=S(O)(O)=O.O=S(O)(O)=O.[H]O[H].[Al].[Al],cas:17927-65-0) is researched.Safety of Aluminum(III) sulfate xhydrate. The article 《Influence of silica sources on morphology of mullite whiskers in Na2SO4 flux》 in relation to this compound, is published in Journal of Alloys and Compounds. Let’s take a look at the latest research on this compound (cas:17927-65-0).

The influence of crystalline form of silica on the morphol. of mullite whiskers in Na2SO4 flux was studied. Isolated mullite whiskers with 5 μm in average length were observed in the sample with amorphous and fused silica while clusters of mullite whiskers were obtained in the sample with quartz. Two distinct nucleation mechanisms were proposed to explain the morphol. of the mullite whiskers.

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In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Raman microscopy study of basic aluminum sulfate. Part II. Raman microscopy at 77 K, published in 1999-09-15, which mentions a compound: 17927-65-0, mainly applied to Raman microscopy basic aluminum sulfate, Name: Aluminum(III) sulfate xhydrate.

The tridecameric Al polymer [AlO4Al12(OH)24(H2O)12]7+ was prepared by forced hydrolysis of Al3+ up to an OH/Al molar ratio of 2.2. Upon addition of sulfate the tridecamer crystallized as the monoclinic basic Al sulfate Na0.1[AlO4Al12(OH)24(H2O)12](SO4)3.55. These crystals were studied using Raman microscopy at 300 and 77 K and compared to Na2SO4.xH2O and Al2(SO4)3.xH2O. The Raman spectrum of basic Al sulfate is dominated by 2 broad bands, which are assigned to the ν2 and ν4 SO42- triplets at 446, 459 and 496 and 572, 614 and 630 cm-1. The ν1 is observed as a single band at 990 cm-1, partly overlapped by the ν3 triplet at 979, 1009 and 1053 cm-1 of the sulfate group in the Al13 sulfate structure. Also the band at 726 cm-1 is assigned to an Al-O mode of the polymerized Al-O-Al bonds in the Al13 Keggin structure. The OH-stretching region of the basic Al sulfate was reported. The 77 K spectrum shows 3 crystal H2O bands at 3035, 3138 and 3256 cm-1 accompanied by 3 Al-H2O bands at 3354, 3418 and 3498 cm-1 and 4 Al-OH bands at 3533, 3584, 3671 and 3697 cm-1.

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Name: Aluminum(III) sulfate xhydrate. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Aluminum(III) sulfate xhydrate, is researched, Molecular Al2H8O13S3, CAS is 17927-65-0, about Application of polyacrylamide flocculation with and without alum coagulation for mitigating ultrafiltration membrane fouling: Role of floc structure and bacterial activity. Author is Liu, Ting; Lian, Yuanlong; Graham, Nigel; Yu, Wenzheng; Rooney, David; Sun, Kening.

There is a growing interest in the use of ultrafiltration (UF) for the treatment of micro-polluted surface waters for drinking water supplies. Effective pretreatment is required to mitigate membrane fouling and in this paper we have evaluated the application of polyacrylamide (PAM) flocculation with alum coagulation. Bench scale tests were conducted over extended periods with two types of PAM (different mol. weights (MW)) applied with, and without alum coagulation, to investigate their impact on membrane fouling. The structure of the resulting flocs formed in the process and the activity of bacteria within the membrane tank were identified as two key factors influencing UF system performance. It was found that development of the cake layer and hydraulic resistance of the membrane were influenced by the floc properties, which were in turn related to the MW and dose of the PAM. Coagulation and flocculation using the larger MW PAM formed amorphous flocs with a lower fractal dimension, which contributed to a lower d. of the cake layer and lower rate of increase in trans-membrane pressure. PAM flocculation without alum coagulation induced severe membrane fouling by forming a continuous gel-like layer on the membrane surface. By alum-PAM dosing it was found that the concentration of bacteria present in the membrane tank and adhering to the cake layer, was sufficient to remove nearly all of the ammonia and around 80% phosphorus in the raw water. These results demonstrate that the combination of a high MW PAM with alum as a pretreatment method of UF process can effectively improve the floc properties and cake layer structure for controlling membrane fouling and producing high quality treated water.

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Name: Aluminum(III) sulfate xhydrate. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Aluminum(III) sulfate xhydrate, is researched, Molecular Al2H8O13S3, CAS is 17927-65-0, about Application of high rate ballasted flocculation technology in wet weather flow treatment. Author is Stachowiak, Remy G..

An innovative treatment technol. to address wet weather events is the ballasted flocculation process (e.g. Actiflo/Microsep from USFilter). The principal benefits of a ballasted flocculation treatment system for wet weather flows include vastly reduced space requirements, rapid start-up and response times, relative insensitivity to fluctuations in raw water quality, and removal rates greater than conventional systems. The key behind the ballasted flocculation process is the use of continuously recycled ballast or fine sand, which attaches to a flocculated particle through a polymer bridge. The addition of ballast provides 2 benefits: the high sp. gr. sand weights flocculated particles leading to much faster solids settling, and the increase in collision frequencies between sand and flocculated particles dramatically increases flocculation kinetics, resulting in very short mixing times. With rapid particulate settling and flocculation kinetics in ballasted flocculation systems, process design must focus on several fundamental parameters within the clarifier to maximize removal efficiencies and minimize plant footprint. This design approach was adopted in pilot testing of the USFilter ballasted flocculation process during wet weather flows at a variety of sites from 1997 through 1999. High quality, consistent effluent characteristics were achieved despite varying influent conditions. High quality effluent was produced within minutes of start-up, ideal for addressing transient wet weather or peaking events. Removal efficiencies through the ballasted flocculation process of over 85% for total suspended solids and over 60% for BOD were demonstrated. Even with a total hydraulic retention time of 6 min, sufficient residence time for mixing and flocculation was available, resulting in a very small footprint approach for wet weather treatment. With high levels of solids removal in a compact footprint, ballasted flocculation provides a cost competitive alternative to conventional clarification and biol. systems for treating wet weather flows.

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