Mini self-cleaning filter
Self-contained dryer unit from K H S Dortmund-based KHS has said it will be exhibiting its Terra Nutsch-type dryer at the AchemAsia ‘98 show in May. According to KHS, this in-line cleanable (CIP) and sterilizable (SIP), intermittent pressure filter, is equipped with a height adjustable stirrer and is capable of performing various recurring processing steps. KHS say a single unit can handle filtering, extracting and washout, blow-out, vacuum and hot gas drying, steaming, dissolving and subliming, as well as discharge of solid substances in a self-contained system. In addition, a number of design alternatives can be adapted to various processes and areas of application including: ?? a completely heatable stirring element for improving the drying capacity. ?? the stirrer shaft is sealed by a “gas lubricated”, double-action, floating ring seal. . slide solid substance discharge at the cylindrical tank casing or centrally in the bottom piece with CIP cleaning.
The degree of automation ranges from manual operation up to and including computer-aided operation with monitor supervision and process visualization. Device sizes range from 0.27 m* to 7.86 m2 (60 mm to 320 mm diameters), filtering surfaces with filling volumes of 1 IO to 15,000 litres and filter cake volumes ranging from 65 to 5,500 litres. Areas of application are generally easily filterable, high solid substance content suspensions which permit filter cakes of 300 to 400 mm and more. KHS says that among the preferred areas of use is the production of active pharmaceutical ingredients such as antibiotics and caffeine, inorganic substances such as iodine, nickel, and barium salts as well as chemical products such as pigments and micro-chemicals.
KHS AG, Juchostrasse 20, D-44 143 Dortmund, Germany. Tel: +49 8333 93085; Fax: +49 8333 93082
Fluid Dynamics has introduced the Minikleen self-cleaning filter which it says will be ideal for engineers who are tired of changing cartridges or bag filters and cleaning out blocked cooling channels. This is because the Minikleen can be plumbed into existing pipework and has a capacity to filter out particles down to a level of 20 urn, according to the UK manufacturer. The Minikleen works by passing water from the delivery side into the filter through a stainless steel mesh screen and on to service. Debris trapped on the filter mesh gradually builds up causing a pressure drop: this drop is indicated on the pressure gauge incorporated into the filter. W ith manual versions of the Minikleen, when the pressure drop reaches a pre-determined level the valve in the base of the filter can be opened.Then a patented pulsating backwash using a small percentage of the delivery flow blasts any accumulated debris off the filter screen. At the same time, a secondary filter comes into operation ensuring that service flow continues to be filtered. Backwash takes just a few seconds, and can also be operated on an automatic control system. Fluid Dynamics say the Minikleen is available in a standard configuration with an acrylic bowl capable of handling delivery pressures of up to 230 psi or in the HP configuration operating up to a level of 400 psi. Flows ranging from 2 m3/hr to 11 m3/hr can be accommodated and larger flows can be handled simply by installing two units in parallel.
Fluid Dynamics International Ltd, East Common, Gerrards Cross, Bucks, SL9 7AG, UK. Tel: -1-44 1753 887213; Fax: +44 1753 880342.
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