2 edition of Evaluation of anionic and nonionic retention aids for closed mill systems found in the catalog.
Evaluation of anionic and nonionic retention aids for closed mill systems
John Richard Boylan
Written in English
|Statement||by John Richard Boylan|
|The Physical Object|
|Pagination||120 leaves :|
|Number of Pages||120|
The range includes Anionic, Nonionic and Cationic polymers in powder, emulsion as well as in solution form. Flocculation is the agglomeration of tiny particles into large units. It therefore, finds application in many different industries and helps in achieving clear supernatant, results in fast settling and increases capacity of clarifiers and. Highly cationic polymers or soluble aluminum compounds are used for the neutralization of excess anionic colloidal charge in papermaking furnish - often the first key step in optimization of drainage and retention systems (see references cited in Part I). Yet another use of highly cationic polymers is in the spraying or forming fabrics or press.
As the paper and board industry continues to increase the speed and output of paper machines, the demands on retention and drainage aids are increasing greatly. Increased shear forces at the headbox and on the wire and ever shorter dewatering zones can be incompatible with the need for good runnability, high quality and good formation. The concentrations of non-ionic surfactants in the raw waters studied ranged from to μg L(-1). In effluents, the concentrations ranged from to 5 μg L(-1), which reflects consistent elimination. Anionic surfactants were present in all waters studied at higher levels.
offers paper retention aid products. About 2% of these are Paper Chemicals, 2% are Electronics Chemicals. A wide variety of paper retention aid options are available to you, such as classification, usage, and type. The Dynamic Drainage/Retention Jar apparatus to evaluation effectiveness of retention aids by measuring the solids in filtrate passing through a screen in the absence of fiber mat formation Broke Paper trim or reject material from the paper machine or other paper mill operations that is repulped and used again to make paper.
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Illustration of the " anchoring site " concept, to explain the effectiveness of anionic retention aids, especially in systems freshly treated with high-charge cationic additives. Retention aid products are also, as a rule, non-toxic.
The main point to stress, however, is that retention aids reduce the load of solids to be processed in a wastewater treatment plant. Also, the amount of solids that need to be handled by save-all filter systems can be reduced if the retention aid system on a paper machine performs effectively.
The most widely used retention aids are very-high-mass copolymers of acrylamide. They may be either cationic (positively charged) or anionic (negatively charged). Experimental results suggest that these retention aids act by forming molecular bridges between adjacent surfaces in the furnish.
The relationship between the first pass retention and chemical cost of various retention aid systems was found to be linear. It suggests that the choice of a suitable retention aid system should depend on the requirements of papermaking operation, the mill closure and the paper by: 2.
“Interactions between cationic starch and anionic trash of a peroxide-bleached TMP at different salt concentrations,” J. Pulp Pap. Sci. 24(3), Buyukkamaci, N., and Koken, E. “Economic evaluation of alternative wastewater treatment plant options for pulp and paper industry,” Sci.
Total Environ. (24), Thermochemical conversions, acid hydrolysis and enzyme conversions all lead to decrease in the molecular weight of the starch and corresponding decrease in the solution viscosity of the starch solutions A large number of starch derivatives cationic, anionic and nonionic are used to improve the dry strength, fine retention, drainage, formation.
In this study, tree different commercial retention aids (10CE, 40CE, and Eka NP-PL-ATC) were used in fluting paper production and the fluting papers with grammages of,and gr/m2. For the nonionic surfactant alcohol ethoxylate (AE), even greater variations have been observed, from μg/L in wastewater treatment systems using activated sludge processes (Morrall et al., ) to mg/L in sludge of anaerobic reactors (Berna et al., ).
The standard method ( D. closed reflux, calorimetric method) was used to determine the COD value of a sample. The SVI was determined using a ml Incoff cone. The performance of the coagulation–flocculation process for pulp and paper mill wastewater treatment was determined through percentage turbidity reduction and percentage COD.
Retention aid is the key to cost-saving in a paper mill. Retention aids are used at the wet end of the paper machine to improve retention of fine particles, fillers, additives & sizing agents during the formation of paper in addition retention of fines also helps in improving smoothness, porosity & sp.
scattering coefficient This improvement is. () Synthesis of a new family of Schiff base nonionic surfactants and evaluation of their corrosion inhibition effect on X type tubing steel in deep oil wells formation water.
Materials Chemistry and PhysicsOnline publication date: 1-Jan Anionic Trash reduces the performance of retention/ drainage aids. As a result production rate and runnability of paper machine is decreased. This paper presents the new approach for improvements of productivity of paper making that the treatment of Anionic Trash is combined with OPTI system (which is dual polymer retention/ drainage system.
According to the present invention a process is provided for making paper of paper board comprising forming a cellulosic suspension, flocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet, characterised in that the suspension is flocculated using a flocculation system comprising a siliceous material and organic microparticles which have an.
Page 1 of 6 "Retention of Fines and Fillers During Papermaking" Edited by Jerome Gess pages, hard cover Item Number: B IS BN: Lignin amines are disclosed which are characterized by high nitrogen content and are water soluble at both alkaline and acidic pH values.
The lignin amines have utility as flocculants, filtration aids, precipitants, scale inhibitors, asphalt emulsifiers, fluid loss additives, oil well cement additives, corrosion inhibitors, retention aids, cationic dispersants, and tall oil pitch emulsifiers.
There are 'low-foam' non-ionic which can be used alone for most operations, while other non-ionic still need 'foam control'. Non-ionics usually foam somewhat less in hot water than in cold. When soap is added to an anionic detergent, foam is depressed.
Non-ionic detergents do not depress foam of anionics; they can even enhance it. Volumetric Mixing in Anionic/Nonionic, Cationic/Nonionic, and Anionic/Cationic Mixed Micelles Lopata JJ(1), Thieu S, Scamehorn JF. Author information: (1)Institute for Applied Surfactant Research and School of Chemical Engineering and Materials Science, University of Oklahoma, Norman, Oklahoma, In WO-A a process of making paper is described in which a cationic polymeric retention aid is added to a cellulosic suspension to form floes, mechanically degrading the floes and then reflocculating the suspension by adding a solution of a second anionic polymeric retention aid.
The anionic polymeric retention aid is a branched polymer. These have made it possibleto even out swings in first-pass retention by varying the additionrates of retention aids. However, in at least one case it wasshown that the demand for retention aid was strongly correlatedwith variations in cationic demand of the furnish (Tomney et al).
Adsorption of nonionic/anionic surfactant mixtures 00 kaolinite has been stUdied with sodium dodecyfsuHate as the anionic surfactant and oc:uethyleneglycd mooo-n-dodecylether as the nooionie surfactant. Synergistic intel3CtiOO between these surfactants was found to cause adsorptioo of the nooiooic surfactant with its hydrophilic chains.
The amount of retention aid or anionic polyacrylamide polymer used may be from about % to about 5%, preferably about 2%, based on the dry weight of the starch. In the laboratory the evaluation of retention aids, etc. is made by fabricating handsheets which are circular paper mats of 25 cms.
diameter. The method used is TAPPI Method T Retention Aids is the key to cost savings in paper mill. The task of retaining chemical and fibers are more challenging in each and every paper mill.
Retention aids are available as powders and in liquid emulsion form. Every paper mill used retention aid depends on some criteria. Here I mention a specification of a paper mill.Evaluation of the flocculation and refloccula tion performance of a system with calcium carbonate, cationic acrylamide co-polymers, and bentonite microparticles.
Antunes et al. Ind. Eng. Chem. Res. 54(1), Efficiency of chitosan and their combination with bentonite as retention aids in papermaking. Bioresources 11(4),