Understanding the Role of Surface Active Substances in Flotation Deinking Mills by Coupling Surfactant and Ink Balance With Process Simulation

TAPPI Journal ◽  
2010 ◽  
Vol 9 (2) ◽  
pp. 31-39
Author(s):  
Davide Beneventi ◽  
Elisa Zenob ◽  
Bruno Carréb ◽  
Jérémy Allixb ◽  
Patrice Nortiera ◽  
...  
Keyword(s):  
Experimental Data ◽  
Process Simulation ◽  
Raw Materials ◽  
Mass Balances ◽  
Second Stage ◽  
Functional Additives ◽  
Paper Sizing ◽  
Surface Active ◽  
Active Substances

Surfactants are largely present in papermaking/recycling processes. They are added intentionally or come with raw materials or process/functional additives. Once they have reached the process, they build-up in the circuits and, depending on their surface activity and concentration, they can have adverse effects on deinking and on the whole papermaking process, such as excessive frothing, depression of ink floatability, and paper sizing/retention difficulties. In this paper, the removal of apparent surface active chemicals (ASAASAASAC) is first evaluated in different flotation deinking mills through mass balances using surface tension measurements and a specific methodology. Mill data show that, in two-stage deinking lines, ASAASAASAC are slightly concentrated in the second stage, contributing to an increase in pulp frothing behavior, in flotation loss, and in some cases to a low ink removal efficiency. Trends observed in deinking mills are then interpreted using experimental data obtained at the laboratory scale in the presence of a model surfactant, and by process simulation. The effect of ASAASAASAC concentration on the efficiency of the flotation deinking process is explained in terms of their effect on particle and water transport sub processes, namely, flotation, entrainment, frothing, and drainage.

scholarly journals The possible role of the Surface Active Substances (SAS) in the airborne transmission of SARS-CoV-2

2021 ◽  
pp. 111215
Author(s):  
Irena Ciglenečki ◽  
Palma Orlović-Leko ◽  
Kristijan Vidović ◽  
Viša Tasić
Keyword(s):  
Airborne Transmission ◽  
Surface Active ◽  
Active Substances

The role of adsorption layers of surface active substances on the formation of polyepoxides

1991 ◽  
Vol 33 (5) ◽  
pp. 967-973
Author(s):  
L.S. Sheinina ◽  
Sh.G. Vengerovskaya ◽  
R.A. Veselovskii ◽  
V.V. Davidenko
Keyword(s):  
Surface Active ◽  
Adsorption Layers ◽  
Active Substances

scholarly journals DEVELOPMENT OF SOUR-MILK HEALTHY BEVERAGES WITH THE USE OF NATURAL HERBAL NANOADDITIVES

2019 ◽  
Vol 13 (4) ◽  
Author(s):  
R. Pavlyuk ◽  
V. Pogarskaya ◽  
K. Balaba ◽  
T. Kravchuk ◽  
A. Pogarskiy
Keyword(s):  
Shelf Life ◽  
Fruits And Vegetables ◽  
Raw Materials ◽  
Food Additives ◽  
Jerusalem Artichoke ◽  
Biologically Active Substances ◽  
Biologically Active ◽  
Fresh Cheese ◽  
Active Substances

Technologies of healthfull products - bioyogurts with unique characteristics have been developed. The new products are characterized by a high content of naturally occurring biologically active substances - phytocomponents of fruits and vegetables (carrots, lemons with zest, apples, Jerusalem artichoke), in particular, β-carotene, phenolic compounds, tannins, ascorbic acid, ie substances having antioxidants. Besides, they have a high content of prebiotic substances - soluble pectic substances, cellulose, inulin and proteins. Recent biogurts play the role of natural thickeners and structure-forming agents. This makes it possible to eliminate the need for the use in the production of bio yoghurt food additives and synthetic additives. Technologies for making bio yoghurts are based on the use of nanosized cryo-additives from nanosize with the record content of biologically active substances (BAS), whose mass fraction in cryo-additives is 2.5 - 5.0 times greater than the original fresh cheese. Obtaining the latter is based on the complex action on the raw materials of cryogenic "shock" freezing with the use of liquid and gaseous nitrogen and cryodestruction with fine grinding. When making bioyoghurts, cryoadditives act as natural enrichment agents, structure-forming agents, texture stabilizers and dyes. In addition, phytoextracts from natural spices and medicinal herbs (echinacea, coriander, burkun, oregano) are included in the formulations for the enrichment of the BAS and for longer shelf life of new bio yoghurts. Whey was used as the basis for the production of bio yoghurts. New types of bio yoghurts in terms of the content of BAS exceed the known analogues and have 2 times longer shelf life (than control samples). Technological modes of production of bioyoghurts on bench semi-industrial equipment have been worked out. New yoghurts are recommended for introduction into production at large food enterprises, in establishments of restaurant business, for individual food.

scholarly journals Regularities of low-waste technology of wastewater treatment by coagulation method

2008 ◽  
Vol 2 (2) ◽  
pp. 133-138
Author(s):  
Iryna Kosogina ◽  
◽  
Igor Astrelin ◽  
Natalya Klimenko ◽  
Andriy Kontsevoy ◽  
...  
Keyword(s):  
Experimental Data ◽  
Wastewater Treatment ◽  
Kinetic Equation ◽  
Sulphuric Acid ◽  
Acid Dissolution ◽  
Wastewater Purification ◽  
Surface Active ◽  
Active Substances

Mechanisms of wastewater purification from surface-active substances and of sulphuric acid dissolution of iron-containing sludge formed during the previous process have been established. Kinetic regularities of metal-containing sludge dissolution in sulphuric acid have been investigated. Kinetic equation which adequately presents the experimental data has been proposed; constants of this kinetic equation have been calculated.

The Analysis of Oil Suppression by Aqueous Film Forming Foam through a Gas-Salt Layer of Water

2014 ◽  
Vol 1073-1076 ◽  
pp. 2353-2357 ◽  
Author(s):  
D.A. Korolchenko ◽  
A.F. Sharovarnikov ◽  
A.V. Byakov
Keyword(s):  
Laboratory Experiments ◽  
Initial Time ◽  
Hydrocarbon Component ◽  
Salt Layer ◽  
Film Forming ◽  
Flame Suppression ◽  
Initial Time Point ◽  
Surface Active ◽  
Active Substances

Regularities and procedure of suppression of oil flame through a gas-salt layer of water are determined as a result of laboratory experiments. Conclusion about defining role of surface activity of foam concentrates in guaranteeing of reliable flame suppression by foam in process of its supplying into the bottom of tank through a gas-salt layer of water is drawn. Time of oil product suppression, which includes the time of saturation of a gas-salt layer of water by surface-active substances and the time of burning elimination, is defined. It is revealed that foam rising through a gas-salt layer of water in an initial time point loses the part of active substances (mainly hydrocarbon component) and partially destructs. Influence of hardness salts on a superficial tension of foam concentrates solutions is shown.

scholarly journals Investigation of terms for application of surface active substances in the manufacture of crystalline glucose

2019 ◽  
pp. 61-64
Author(s):  
L. S. Khvorova ◽  
N. R. Andreev ◽  
N. D. Lukin
Keyword(s):  
Surface Tension ◽  
Induction Period ◽  
Practical Interest ◽  
Aliphatic Alcohols ◽  
Successful Outcome ◽  
Seed Crystals ◽  
Surface Active ◽  
Active Substances

The successful outcome of the existing methods for the crystallization of glucose to greatly depends on the conditions of the stage of nucleation of crystals. The study was conducted with the aim to improve ways of nucleation during the crystallization of glucose. According to the theory of crystallization the rate of nucleation formation in the highest degree depends on the surface tension (ST) of solutions. Theoretical and practical interest is presented the role of ST in the process of crystallization of glucose. Studies have been carried out to determine the surface tension of glucose solutions depending on the concentration of dry substances (DS) and temperature. As a result of research, it has been determined that the ST of glucose solutions increases with an increase in the concentration of DS and a decrease in temperature. When testing aliphatic alcohols as a surface-active substances (surfactants), it was found that ST solutions decrease 2.5 times. The accelerating effect of aliphatic alcohols on the nucleation of crystals was expressed in a decrease in the induction period from 210 minutes to 120 minutes, respectively, in pure solutions and in the presence of surfactants. Tests of various types of seed crystals have revealed that large ( 200 m) and small (60 m) hydrated glucose crystals moistened with alcohol are most effective for crystallizing anhydride glucose under polythermal conditions. The proposed method can significantly save the consumption of glucose for seed, improve the conditions of crystallization and improve the quality of glucose microbial purity.

COMPARATIVE ANALYSIS OF BIOACTIVE SUBSTANCES CONTENT IN THE LEAVES AND FRUITS OF A ROWAN-TREE (SORBUS AUCUPARIA FRUCTUS) AND ASSESSMENT OF PROSPECTS IN MEDICINE AND PHARMACY

2020 ◽  
pp. 58-62
Author(s):  
Chernichkina A.D.
Keyword(s):  
Raw Materials ◽  
Wide Distribution ◽  
Biologically Active ◽  
Bioactive Substances ◽  
Plant Raw Materials ◽  
Mountain Ash ◽  
The Russian Federation ◽  
Materials Used ◽  
Active Substances ◽  
Pectin Substances

A large number of biologically active substances, organic acids, tannins, and pectin substances were detected during the study of fruits, leaves, and pulp of the fruits of mountain Ash. The content of these substances in leaves and pulp will significantly expand the arsenal of medicinal plant raw materials used. Given the wide distribution of mountain Ash in the territory of the Russian Federation, harvesting leaves from the same plants after harvesting the fruit and using pulp will make it possible to obtain new phytopreparations.

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