scholarly journals Experimental and theoretical study of the flocculants mixing in water

2021 ◽  
Vol 266 ◽  
pp. 02012
Author(s):  
A. Grigoryeva ◽  
Rufat S.Abiev
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Theoretical Study ◽  
Experimental Studies ◽  
Frictional Stress ◽  
Concentrated Solutions ◽  
Mechanical Stirring ◽  
Optimal Rotation ◽  
Cationic Flocculant ◽  
Semi Empirical

The article discusses the process of high molecular weight flocculant particles dissolving in water during mechanical stirring. A procedure of mixer selection taking into account mixer geometry based on the Prandtl’s semi-empirical turbulence model was developed and described. It was found that the choice of the optimal rotation speed is related with the turbulent frictional stress generated by the impeller of the mixer. The results of experimental studies on the preparation of concentrated solutions of high molecular weight cationic flocculant MagnaflokМ 155 using various impeller types are shown. The efficiency of a conical mixer has been confirmed, which makes it possible prepare a flocculant solution 1.3 times faster due to the possibility of mixing at higher rotational speeds with lower power consumption

scholarly journals A theory relating the action of salts on bacterial respiration to their influence on the solubility of proteins

1947 ◽  
Vol 134 (875) ◽  
pp. 181-201 ◽  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Dehydrogenase Activity ◽  
Halophilic Bacteria ◽  
Convincing Evidence ◽  
Effect Of Temperature ◽  
Bacterial Respiration ◽  
Concentrated Solutions ◽  
Salting Out ◽  
Intact Cells

Evidence has been presented indicating that the action of concentrated solutions of salts on bacterial respiration may be partly explained in terms of salting-out. It has been suggested that the material upon which this action is exerted is probably one of the proteins concerned in respiration, perhaps a dehydrogenating enzyme. This theory provides satisfactory explanations for: ( a ) the relation between salt con­centration and rate of respiration or dehydrogenase activity; ( b ) the effect of temperature on this relation; and ( c ) the effect of pH on this relation, if it is further supposed that only the zwitterionic fraction of the protein is involved. The relative actions of various salts are in fair agreement with this suggestion, but provide no very convincing evidence either for or against it. The chief point of difficulty lies in the range of concentration over which the action is manifest. With halophilic bacteria, the evidence is consonant with the above view if the protein involved is one of high molecular weight. With normal organisms the salt concentra­tions are much lower than those causing salting-out. There is a little evidence that in normal organisms the dehydrogenating enzymes are less sensitive to salts than the intact cells, which may be the source of the discrepancy. No reason for this can yet be suggested, but the property must be absent from the enzymes of halophilic organisms, and whatever it is, its absence must be the foundation of the halophilic character.

scholarly journals Single-chain polybutadiene organometallic nanoparticles: an experimental and theoretical study

2016 ◽  
Vol 7 (3) ◽  
pp. 1773-1778 ◽  
Author(s):  
Inbal Berkovich ◽  
Sudheendran Mavila ◽  
Olga Iliashevsky ◽  
Sebastian Kozuch ◽  
N. Gabriel Lemcoff
Keyword(s):  
Molecular Weight ◽  
Double Bond ◽  
High Molecular Weight ◽  
Metal Binding ◽  
Theoretical Study ◽  
Binding Kinetics ◽  
Rhodium Complexes ◽  
Single Chain ◽  
Double Bond Content

High molecular weight polybutadienes and rhodium complexes were used to produce single chain organometallic nanoparticles. A relationship was found between the cis double bond content of the polymer and metal binding kinetics.

scholarly journals Исследования диэлектрических свойств нефтяных дисперсных систем в зависимости от соотношения асфальтосмолистых веществ

2022 ◽  
Vol 48 (4) ◽  
pp. 41
Author(s):  
Р.Р. Зиннатуллин ◽  
Л.А. Ковалева
Keyword(s):  
Molecular Weight ◽  
Electromagnetic Field ◽  
Dielectric Properties ◽  
Radio Frequency ◽  
High Molecular Weight ◽  
Experimental Studies ◽  
Frequency Range ◽  
Dielectric Parameters ◽  
Dispersed Systems ◽  
Polar Components

The degree of influence of the electromagnetic field on oil dispersed systems depends on the dielectric properties of these systems, in particular oil. Dielectric properties of oil depend on the content of high molecular weight polar components: asphaltenes and resins. In this regard, a study was carried out of the dielectric properties of oil in the radio-frequency range, depending on the content of asphalt-resinous substances in it. The obtained results of experimental studies show the correlation of dielectric parameters with the ratio of the content of resins and asphaltenes in oil.

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