Tag: M.W=300-400

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Application of high rate ballasted flocculation technology in wet weather flow treatment, published in 1999, which mentions a compound: 17927-65-0, Name is Aluminum(III) sulfate xhydrate, Molecular Al2H8O13S3, Reference of Aluminum(III) sulfate xhydrate.

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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Liu, Ting; Lian, Yuanlong; Graham, Nigel; Yu, Wenzheng; Rooney, David; Sun, Kening published the article 《Application of polyacrylamide flocculation with and without alum coagulation for mitigating ultrafiltration membrane fouling: Role of floc structure and bacterial activity》. Keywords: polyacrylamide flocculation alum coagulation mitigating membrane fouling floc bacteria.They researched the compound: Aluminum(III) sulfate xhydrate( cas:17927-65-0 ).SDS of cas: 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.

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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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Aluminum(III) sulfate xhydrate( cas:17927-65-0 ) is researched.SDS of cas: 17927-65-0.Pradhananga, Trinetra M.; Matsuo, Sadao published the article 《Deuterium/hydrogen fractionation in sulfate hydrate-water systems》 about this compound( cas:17927-65-0 ) in Journal of Physical Chemistry. Keywords: deuterium isotope fractionation ion hydration; sulfate hydrate water isotope fractionation; transition metal sulfate hydrate structure. Let’s learn more about this compound (cas:17927-65-0).

The D/H fractionation factors (α) of some of the sulfate hydrate-H2O systems were measured. A dependence of α on cationic parameters and M-H2O distance was found. The D/H fractionation factors of various hydrate-water systems were divided into 2 groups with respect to their α values: one having α < 1 and the other α > 1. There is almost no change in α for crystal-H2O systems having SO42- as the anion of the 1st transition metal ion series from Fe2+ to Zn2+, except for Cu2+. This is related to the common structure of the hydration sphere of cations and the common distance of M-H2O. The exceptional case for Cu2+ is attributed to the distorted structure of octahedra surrounding Cu2+. A similar type of behavior of protons leading to the residual entropy was found in some of the crystal-H2O systems having α > 1.

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Category: isothiazole. 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 Preparation of hollow zeolites with aliphatic polyols under hydrothermal conditions. Author is Chen, Qing-chun.

Taking al2(SO4)3·(14∼18)H2O and Na2SiO3·5H2O as main raw materials, several kinds of fine powders were prepared by using simple hydrothermal synthesis method. The XRD tests showed that one kind of the powders was composite of analcime and sodalite, and its SEM images showed that the fine powders were uniform hollow spheres with diameter under 5 μm. The other two kinds of powders were zeolite P, and their SEM images showed that they were hollow octahedrons with diameter of around 30 μm.

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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called The testing conditions of sodium carbonate, sodium sulfate and certain other hydrated salts, published in 1931, which mentions a compound: 17927-65-0, Name is Aluminum(III) sulfate xhydrate, Molecular Al2H8O13S3, Quality Control of Aluminum(III) sulfate xhydrate.

The H2O content of Na2CO3.10H2O can be determined by heating at 98° to constant weight The most stable hydrate is Na2CO3.2H2O; it is formed on standing from anhydrous soda or from the other hydrates. Na2SO4.10H2O loses all the H2O by drying a few hrs. at 98°, although the natural decahydrate, mirabilite, is stable. Borax requires heating to redness to accomplish complete dehydration. CuSO4.5H2O is very stable and does not lose water on standing over H2SO4. Al2(SO4)3.18H2O is also very stable and does not easily lose H2O. The chrome alums are easily deprived of H2O.

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Spicer, Patrick T.; Pratsinis, Sotiris E.; Raper, Judy; Amal, Rose; Bushell, Graeme; Meesters, Gabrie published an article about the compound: Aluminum(III) sulfate xhydrate( cas:17927-65-0,SMILESS:O=S(O)(O)=O.O=S(O)(O)=O.O=S(O)(O)=O.[H]O[H].[Al].[Al] ).COA of Formula: Al2H8O13S3. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:17927-65-0) through the article.

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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Safety 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 State of water in the dehydration products of beryllium and aluminum sulfates. Author is Chuvaev, V. F.; Gazarov, R. A.; Spitsyn, V. I..

The NMR of BeSO4.4H2O, Al2(SO4)3.18H2O and of the products of their dehydration were determined Some details of the NMR spectra of MgSO4.7H2O and its dehydration products were also investigated. Substantial increase of the interproton distance was observed in all the sulfates studied possessing low amounts of H2O. This phenomenon is explained by the strong polarization of the H2O mols. and by expansion of the O-H bonds.

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Formula: Al2H8O13S3. 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 Dielectric measurements in the early stages of hardening of monomineral binders. Author is Svatovskaya, L. B.; Shiballo, V. G..

The dielec. permeability ε of cement hardening systems decreased immediately after preparing suspensions and condensation structures with water were formed having a lower ε. At the end of the hardening process, ε remained constant Because only a small part of the water was chem. bound, the decrease in ε could be connected with the orientation effect. The curves of dielec. losses of the hardening pastes had a complex cyclic character. According to crystallo-optical data, the cyclic character was connected with changes in the phase composition of 3CaO.Al2O3,3CaO.SiO2, and Al2(SO4)3 hydrates and in the 3CaO.Al2O3 + CaSO4 system with the discontinuities of hydrated sulfate aluminate and hydrated aluminate layers.

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Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 17927-65-0, is researched, Molecular Al2H8O13S3, about Controlled aggregation of colloidal particles for toner applications, the main research direction is aggregation carboxylated polystyrene colloidal particle coagulant electrophotog toner application.Electric Literature of Al2H8O13S3.

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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Application In Synthesis of 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 Infrared spectroscopic study of phase transformations and the kinetics of the thermal decomposition of aluminum salts. Author is Drobot, N. M.; Khazanov, E. I..

The ir spectra were obtained by heating the samples thus showing the penetration of H2O into the structure of the decomposition products of the salts. AlCl3 and Al(NO3)3 are dehydrated up to 100° with formation of basic salts. The NO3 group is present up to 700°. Al2(SO4)3 has 2 forms of H2O of hydration up to 360°. The apparent energy of activation of AlCl3 dehydration is 270 kcal/mole. The presence of the ions SO42-, Cl-, NO3-, OH- affects the thermal decomposition of the salts.

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