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Evonik’s percarbonate plant in Rheinfelden Evonik’s coating method for producing stabilized percarbonate 1. Spray granulation 2. Spray coating Scanning electron microscope image of the coating-stabilized percarbonate 100:1 Na 2CO 3 solution H 2O 2 solution Air Sodium percarbonate Air 100:1 Na 2SO 4 3.90 µm 6.64 µm 5.20 µm 6.35 µm 6.29 µm 4.31 µm 5.53 µm 4.72 µm 500:1 50µm Percarbonate: stable and sustainable In the past three years, scientists from Evonik‘s Industrial Chemicals Business Unit have refined the coating method in the production process for percarbonate, and significantly improved the stability of the exterior covering and, therefore, the strength of percarbonate against humidity and other influences. The improved percarbonate displays all the physico-chemical properties expected of an advanced, sustainable product. It has a good free flowing property and an excellent storage stability, with an outstanding shelf-life in formulations. And thanks to its high bulk density, it is particularly well suited to use in compact laundry detergents. Percarbonate is also attractive for compact laundry detergents because, unlike perborate, it is multi-functional. In addition to the oxidative action of hydrogen peroxide it also contains soda, which promotes the alkalinity of the wash solution and enhances the cleaning action (2 in 1). Se p - arate formulation of soda ash, therefore, can be reduced significantly. The best evidence of the high chemical and mechanical resistance of the improved percarbonate is its good storage stability in the finished laundry detergent, which retains its cleaning power longer. The bleaching agent no longer has to be overdosed in laundry detergent production. Instead, smaller quantities of raw materials can be used for the same level of efficiency. The improved stability of the percarbonate during storage of the laundry detergent means that enzyme systems with greater sensitivity to oxygen can be used in such products as concentrated laundry detergents, where they develop a good cleaning action. The world converts to granulated percarbonate from Evonik Because percarbonate is an oxidizing substance, it poses a special risk that requires policies for safeguarding its production, transport, storage and processing. The sites have to have a permit, and may store only certain quantities. Customers, in turn, receive advice from Evonik on storage of the stabilized percarbonate. Having already assisted various customers with the transition from perborate to percarbonate in the past, Evonik is currently spearheading conversion of the remaining production plants that make laundry and cleaning detergents. To this end, Evonik developed various cus - t omer-specific validation tests for product qualification purposes to ensure that the percarbonate coating, for instance, would not be damaged 34 elements32 evonik science newsletter
Big bags of sodium percarbonate ready to be shipped to destinations worldwide dur ing delivery of the material from the storage silo to the production process. Based on elaborate safety measure ments and models, Evonik was able to show that granulated percarbonate is ideal for use under extreme climatic and production conditions. But because transport law defines it as a hazardous material with special requirements, Evonik also analyzed the transport of percarbonate from its own production plants to the laundry detergent factories of its clients across the globe. Certain laundry detergents in the growth markets of the Middle East and Africa already contain granulated percarbonate from Evonik, even though the worldwide transition from perborate to percarbonate is still underway. Benefiting from its technological leadership position and a superior product quality developed in recent years, Evonik is being recognized as a reliable and competent partner to the global consumer goods industry. l elements32 evonik science newsletter c o A t i n G & B o n D i n G t e c H n o l o G i e S Bleaching salt for special applications the bleaching agent percarbonate is the primary component of most conventional bleaching salts. in addition to stain removal in the laundry, the “active oxygen” that forms as the percarbonate dissolves in water has other practical uses. examples: Coffee and tea pots Dissolves the calciumcaffeine complex that leaves a brown film on the porcelain. to remove the film, fill the pot with warm water and add a spoonful of bleaching salts. Allow the salts time to work (they will foam), then rinse the pot thoroughly with water. You can also add a small drop of dish washing liquid for greater cleaning effect. Tar and oil stains on tiles and stoneware the active oxygen “inserts” itself under the tar/oil film, decomposes there, and the oxygen generated dissolves the film off the subsurface. Organic waste bins Prevents unpleasant smells. combined with the activator (tAeD) contained in the bleaching salt, percarbonate forms peracetic acid, which kills bacteria. Peracetic acid is environmentally safe because it breaks down into oxygen and acetic acid. Fish pond keep silt from overtaking your pond. the percarbonate brings active oxygen to the silt without injuring the fish (as long as the correct amount is used). the soda in the percarbonate also acts as a neutralizing agent on overacidified ponds. Mold stains on tile grout, for example: mix the bleaching salt with enough water to make a paste (wearing rubber gloves), apply the paste to the mold stain, allow to work, then rinse with water. DR. STEFAN LEININGER Stefan leininger is in charge of application engineering for the nonPulp & Paper unit of the Active oxygens Business line, and manages product and process development for detergent base materials. in this latter role, he works closely with customers on the global transition from perborate to percarbonate. leininger earned his doctorate in chemistry at the University of kaiserslautern in 1996, and then spent three years in research at the University of Utah in the United States before coming to evonik in 1999. Among his activities prior to starting in his current position in 2004, leininger was involved in the development of titanium silicate catalyzed chemical processes for ammoximation and epoxidation based on hydrogen peroxide. +49 6181 59-3295, stefan.leininger@evonik.com 35
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