Klose A.,TU Darmstadt |
Tiedtke E.,Kolb Distribution Ltd.
International Paperworld IPW
A study was conducted to achieve a better understanding about long term effects of a certain range of chemical additives to the anaerobic process. These effects needed to be tested on a pilot scale directly in a paper mill and the selection of products was focused on active ingredients which were suspected to have a negative impact or irritate the granular biomass. The choice was made for non-ionic surfactants, presented as deposit dispersants and volume enhancers, along with biocides. The pre testing was done on lab scale using OxiTopSystem as a range finding instrument for the pilot scale trials. The measurement of the gas production was simple and the equipment was easy to handle, as compared with other batch test methods on lab scale. The batch tests were based on real paper mill waste-water from SCA and adapted granular biomass. Source
Kolb Distribution Ltd. | Date: 2011-08-11
The present invention is directed towards a method of preparing alkoxylated fatty acid alkyl estersin a one-pot alkoxylation reaction in the presence of a catalyst which is an alkaline earth metal oxide/mineral acid combination, preferably a barium oxide/sulfuric acid combination, or a Lewis acid, preferably Sn Cl
Tiedtke E.,Kolb Distribution Ltd. |
Otto K.,Kolb Distribution Ltd. |
Blickenstorfer C.,Kolb Distribution Ltd.
Wochenblatt fuer Papierfabrikation
A discussion briefly covers the methods of operation of surfactants, the most important types, and market shares. It is pointed out where non-ionic surfactants are used in paper production. By two practical examples (felt conditioning and deposition control) it is explained how the production process can be improved with non-ionic surfactants as process chemicals in the manufacture of paper, paperboard, and tissue. Discussion topics include types, modes of action, and uses of surfactants; surfactants market in Europe (as chemical additive and as formulation component of a chemical additive); conditioning of press felts and deposition control as example of the use of non-ionic surfactants as paper process chemicals; and conclusion. Non-ionic surfactants are used as conditioning agents of paper machine clothing and as dispersing agents against deposition to enable paper production disturbance-free. The practical example relates to specialty and graphics paper production at 600 m/min at a working breadth of 4.5 m. The challenge was to condition with cationic polymers against deposition on the pick-up felt. The solution was to condition with a non-ionic polymeric surfactant on the pick-up felt to achieve a stable deposition level and improved runability. In 2009, 2.77 million tonnes of surfactants were produced in Europe. The ethoxylates and non-ionic surfactants comprised 50% of the market. A large part of the surfactants produced in Europe was used there. The largest part of non-ionic surfactants was used in liquid or powder laundry agents. About 38% of all non-ionic surfactants are used in industry. In the paper industry, the greatest use is as chemical additive or component of a chemical additive in paper manufacture. Source