cpp - Process technology for the chemical industry 02.2018

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cpp ACHEMA PROCESS ENGINEERING Tubular centrifuges with automatic solids discharge The piston is the secret of success The Rina SRP AD supercentrifuge is based on the proven, conventional technology of tubular centrifuges. However, instead of manual solids discharge, the “AD” features fully automatic solids discharge. The central element is a special piston inside the rotor. Rina supercentrifuges are vertical axis machines fitted with a hanging cylindrical bowl, which rotates at high speed to generate a centrifugal force of up to 20,000 g. They are used for solid-liquid separation, for instance for solids recovery or the removal of suspended impurities as well as for separating immiscible liquids of different densities. Blood fractioning, gamma globulin recovery, the separation of plasma and red cells in human or animal blood and the separation of viruses and bacteria are typical applications in the pharmaceutical industry. The clarification of wine, the separation of nanoparticle suspensions and cleaning of used machine oil are other examples. The machines are characterised by a modern, sturdy design in conformity with GMP regulations and are easy to operate. All models have a wide-opening, hinged casing to facilitate the withdrawal of the rotor from the front. Rina SRP supercentrifuges can also be supplied for use in potentially explosive atmosphere, in which case they are Atex certified. Other optional features such as cooling and heating coils, CIP and SIP capability or the integration of ancillary equipment in the control system can be provided if required by the intended application. Pictures: Riera Nadeu The technology of the Rina SRP AD supercentrifuge is based on Riera Nadeu’s standard tubular centrifuges but with automatic solids discharge Traditional operating modes Riera Nadeu offers different rotor types with different operating modes such as discontinuous solid-liquid separation (C) or continuous liquid-liquid separation (S). Solid-liquid separation works discontinuously (i. e. in batches), the solid being the heavy phase. The “C” (clarifier) rotor has 82 cpp 02-2018
Section through the Rina SRP AD: the piston is pulled upwards to operate and down again to discharge the solids State of the art facility, tailor made machines, manufactured exclusively in Western Europe Until now, the rotor had to be removed for emptying and opened manually. This can be problematic, especially with toxic media. only one liquid outlet for the lighter (liquid) phase. The solids are retained inside the rotor. If the product is conveyed directly from the inlet to the discharge without clarification, this is an indication that the rotor’s retention capacity is exhausted and that the rotor must be emptied or replaced. If two immiscible liquid media are involved, the process is continuous. Due to the differences in density and the centrifugal force, the heavy phase moves towards the wall. The lighter phase, the so-called supernatant, forms a film over the heavy phase and follows the same upward direction. At the top of the rotor, a diaphragm guides the media into two different liquid outlet devices. As a third option, an “S” rotor can be used for discontinuous liquid-liquid-solid sepa - ration. Solids are retained inside the rotor as described above. The two immiscible liquid phases are guided via a diaphragm to two different liquid outlets according to their density difference. Fully automatic solid-liquid separation is now possible thanks to the Rina SRP AD. Working principle of the SRP AD The main working principle of the Rina SRP AD is the same as for all other supercentrifuges used for solid-liquid separation, except that manual intervention is no longer necessary for the solid discharge. This is carried out fully automatically with the help of a piston inside the rotor. The most impor - tant advantage here is that no additional mechanical devices are needed in the product area. The piston is moved up and down under vacuum and high pressure. To achieve automatic solid discharge, the piston is pushed down at high pressure, thus forcing the solids towards the outside through a three-way valve. After the solids have been discharged, the piston returns to its working position under vacuum pressure. The switch between high pressure and vacuum is possible thanks to a special valve located in the centre of the piston. This highly complex solution was developed with the aim of maintaining the proven working principle and peculiarities of a tubular centrifuge. It provides several clear benefits: • Simple mechanics and hence affordable manufacturing costs and final product price • Compact design (small footprint) • Machine as a whole is not pressure equipment even though it works with pressure and vacuum • Proven process and operating principle of the supercentrifuge retained: feeding and discharging from the bottom, light phase drained through the top collector on the upper part of the rotor • Same solid-liquid separation processes as are currently performed with conventional supercentrifuges are also possible with the new Rina SRP AD Suitable for difficult products Apart from applications which have been the domain of conventional high speed supercentrifuges until now, the Rina SRP AD can also be used for processes where a fastrotating supercentrifuge is desirable but so far not feasible due to the manual solids discharge, typically involving toxic products or ones where extremely high hygienic stand - ards are stipulated. Riera Nadeu has a SRP AD supercentrifuge at its own test centre for trial purposes. The Rina SRP AD 8 has a solids retention capacity of 8 l, with a footprint of 750 x 1225 x 2000 mm, and weighs about 950 kg. A maximum of 18,000 g can be produced. The wetted parts can be made from AISI 316L, Duplex or titanium. The Rina SRP AD is suitable for temperatures from -10 to +60 °C as standard. www.cpp-net.com Online search: cpp0218rieranadeu Hall 5.0, Booth D41 AUTHOR: CAROLA LANGROCK Sales Engineer Europe, Riera Nadeu AUTHOR: JÉRÉMIE BARDO Head of Business Development, Riera Nadeu cpp 02-2018 83
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