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Europe, Germany

Reverse osmosis (RO) plants are increasingly applied to supply the industry with high-quality process water, to produce boiler feedwater in power plants and to recycle waste water streams. During the last years, new developments for the membrane material and also for the treatment chemicals have resulted in higher efficiency and reliability of the RO plants. Nevertheless, especially RO plants that are getting their raw water from surface waters with open intake or from waste water streams are facing problems with the formation of fouling on the membranes during operation. In such cases, the efficient cleaning of the membranes is mandatory to ensure the long-term supply of permeate at high-quality and of sufficient quantity. New cleaning concepts with proprietary cleaning products are gaining more importance. The successful application of such a cleaning concept at Germany's biggest RO plant is described. Source

Otzisk B.,Kurita Europe GmbH
Hydrocarbon Engineering

Kurita Europe GmbH has introduced cleaning and degassing additives that can clean the metal surface and eliminate pyrophoric iron components of flare system equipment. The cleaning and degassing products can be dosed into a wash water source or into the steam phase and the time frame of a successful chemical cleaning and degassing procedure is reduced. An additive from the patented Kurita ACF product line may be dosed directly into the steam phase. Salt deposits and mud like sludge can be dissolved and removed, achieving the full functionality of the pressure relief valve. In one case study, the company's equipment were used for the chemical treatment program that included removal of deposits and dirt and passivation of equipment against corrosion and pyrophoric reactions. In a second case, Kurita ACF product were used in a pressure relief valve of a flare support and the fouling material was removed quickly and completely after demounting and dipping into a beaker. Source

Otzisk B.,Kurita Europe GmbH
Petroleum Technology Quarterly

Gasification is a mature process for converting hydrocarbons into electric power, clean synthesis gas, fertilizers, fuels and chemicals with minimum environmental impact. Powerful antifoulants can improve runtime and profitability when fouled synthesis gas (syngas) coolers or soot scrubbers are causing bottlenecks. A discussion on an antifoulant program which can provide a gasification unit with an extended runtime covers fouling inhibition; syngas cooling; and case studies. Source

Otzisk B.,Kurita Europe GmbH
Petroleum Technology Quarterly

Emulsions can cause fouling and under-deposit corrosion problems in distillation columns, heat exchangers, and reboilers. Emulsions can be classified as oil-in-water and water-in-oil types. Both types of emulsions can co-exist in crude oil side by side. A discussion covers separation of water-in-oil and oil-in-water emulsions; typical applications in refineries; crude oil desalting; and wastewater treatment. Source

Zimmer K.,Kurita Europe GmbH | Hater W.,Kurita Europe GmbH | Icart A.,Kurita Europe GmbH | Jaworski J.,Institute of Chemical Engineering and Plant Design | And 2 more authors.
Desalination and Water Treatment

A new membrane-based method was applied to investigate the performance of three phosphorus-free antiscalants of different chemical structures to prevent calcium carbonate scale. Apart from a polyacrylate homopolymer, two copolymers were studied, one of it also being free of nitrogen. The results show that an inhibition of CaCO3 scale on reverse osmosis (RO) membranes is possible with phosphorus-free antiscalants. The individual performance strongly depends on the chemical structure of the polycarboxylate. A specially adapted copolymer clearly outperforms the polyacrylate homopolymer in case of severe scaling conditions. The average residence time of the water in the test plant is approximately 1 h, compared to around less than a minute in a full-scale RO plant. So the operating conditions in the test plant make it more difficult for an AS to inhibit scaling compared to a full-scale RO plant. By energy-dispersive X-ray fluorescence (EDXRF), the scaling layer thickness can be estimated. The SEM images and the 3D images from CLSM showed that the water quality and the applied antiscalant have a great influence on the scaling layer morphology. The effective blocking of the membrane does not only depend on the amount of precipitated CaCO3 but there is also a great influence of the scaling layer structure. With a normal scaling potential of the water, the scaling layer consists of calcite, and at higher LSI values of the feed water, there was also aragonite found on the membrane. From the three antiscalants AA/AMPS shows, as it was expected, the lowest performance as calcium carbonate scale inhibitor, because it is designed predominantly as a disperser and as stabilizer for calcium phosphate. PAA proved to be an efficient inhibitor for hardness at standard applications. For the application in waters with high scaling potential, AA/EA is very suitable, because this inhibitor is able to serve as a good stabilizer for hardness and at the same time as a disperser. A combination of different polymers enables special solutions for high requirements. © 2016 Balaban Desalination Publications. All rights reserved. Source

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