December 12, 2016

Rotary pressure filters for pilot projects and small-volume production

Rotary pressure filter of type RPF P01

Rotary pressure filter of type RPF P01 as a laboratory and pilot filter for test series and small-volume production with an active filter surface of 0.17 m²

The smallest of its kind, RPF P01, is a compact yet structurally identical version of the proven rotary pressure filter (RPF) from BHS-Sonthofen for continuous filtration and separation of suspensions. Thanks to its small size, the RPF P01 rotary pressure filter is especially suited to pilot tests for process preparation as well as small-volume production and batch tests. The identical design ensures that the settings are fully scalable to larger production filters at a later stage. This facilitates the development of large-volume production systems for chemical, petrochemical, pharmaceutical and medical applications, as well as for the food industry. In late 2016, the pilot filter debuted in Germany in the production of sugar substitutes. In Switzerland and Scandinavia, the pilot filter is currently being used for testing in the production of antibiotics and medical contrast agents. As a special service, BHS-Sonthofen is also making this filter available on a rental basis for verifying laboratory data during continuous testing on the customers’ premises.

Rotary pressure filters of type RPF facilitate continuous filtration of almost all suspensions in complex production processes. A large number of process steps occur during a single rotation of the drum, such as separating the slurry into filtrate and filter cake, single- or multi-stage cake washing, suspension, solvent exchange, steaming, extraction as well as mechanical or thermal cake dehumidification. All of these process steps take place in separate, pressure-tight segment zones within the filter. This also allows the cake to be discharged directly to the surrounding area at atmospheric pressure without the need for separate pressure compensation, for example, via pressure locks. This also enables the precise drainage of filtrates in discrete zones.

Pilot filter for determining systems technology needs

Owing to its small size of 2 x 1.3 x 2 m (L/W/H), a filter surface of 0.17 m² and a low weight of just 2,500 kg, the RPF P01 rotary pressure filter from BHS-Sonthofen is suitable both for small-batch production and for use in testing facilities. It generates little noise, and thanks to its low rotation speed the filter does not require any special foundations. It is therefore suitable for semi-mobile applications. Using the rotary pressure filter in preliminary tests allows engineers to make strategic decisions regarding subsequent plant technology for large-volume production. This is possible because the universally adjustable housing is exactly identical with larger models and, from a process engineering point of view, is extremely versatile. Depending on what type of sealant is used, the filter supports operating temperatures from -20 °C to 160 °C and operating pressures of up to 7 bar (g) with a filter cake thickness of 5 mm to 100 mm. In contrast to one-off pilot production installations, the rotary pressure filter supports long-term testing under continuous production conditions. At the same time, pressure is generated hydraulically in all process steps by feeding suspension, wash liquids or extraction agents. In this way, each step in the process can be individually optimized. Moreover, this general functional principle – which is applied across the entire range of BHS rotary pressure filters – results in extremely low resource usage, especially gas consumption.

Single-batch production at pharmaceutical quality for the chemical and food industries

The range of applications for rotary pressure filters from BHS-Sonthofen includes intermediate plastic products (PTA and ABS), pharmaceutical products, colors, pigments and cellulose products (MC, HEC, HMEC and CMC). Single-batch production at pharmaceutical quality is made possible by supporting counter-current washing, displacement washing and closed-cycle washing during the filter cycle. In addition, the production processes can also be applied to foodstuffs and pigments. A well-known German chemical company started using the rotary pressure filter as a component in the production of sugar substitutes in late 2016. Furthermore, the RPF P01 is used in coffee extraction, and in India it is used in spice production (turmeric).

Single-batch production in the pharmaceutical industry

For the pharmaceutical industry, the range of applications for rotary pressure filters from BHS-Sonthofen includes products such as antibiotics, hormone derivatives and statins. The RPF P01 is currently being used by a renowned pharmaceutical company based in Austria in a long-term test of the preliminary stage in the production of antibiotics. In Scandinavia, it is being used by a leading international supplier of medical technology solutions in tests for the production of a contrast agent. Single-batch production at pharmaceutical quality is made possible by supporting counter-current washing, displacement washing and closed-cycle washing during the filter cycle.

“For decades, our rotary pressure filters have proven to be successful in complex production processes. With the small-sized RPF P01, we offer our customers the capability to implement continuous small-volume productions or to gain precise scale-up data for future process design. And thanks to the compact size, we can also make these filters available to customers on a rental basis for experimental purposes and pilot tests on their premises,” says Jürgen Maurer, Director of Sales, Filtration Technology at BHS-Sonthofen.

For more than 60 years, BHS-Sonthofen has been a global market leader in the development and manufacture of rotary pressure filters. More than 1,000 systems are currently in use worldwide. The range of products extends from the smallest filter, the RPF P01 with a filter surface of 0.17 m² and a weight of 2,500 kg, to filters such as the RPF X20 with a drum diameter of 1.8 m, a filter surface of 8.6 m² and a weight of 42 tons.

Rotary pressure filter of type RPF P01

Rotary pressure filter of type RPF P01

Illustrating the difference in size:

Illustrating the difference in size: Quality control and final inspection with a rotary pressure filter of type RPF X20 (left) with an active filter surface of 8.6 m² and a rotary pressure filter of type RPF P01 as a laboratory and pilot filter with an active filter surface of 0.17 m².

Rotary pressure filter in second-containment design

Special version of the rotary pressure filter of type RPF X16 in a second-containment design with an additional pressure-tight housing. When used with extremely toxic and/or highly volatile solvents (such as phenol), this additional seal ensures maximum safety in terms of machine operation and protecting the environment.

Share this page:
Online contact request
Verify your details
Verify your details
OK
We use cookies in order to adapt the website to the requirements of our visitors in the best possible way. The use of our website indicates your agreement to having cookies stored on your computer. Data privacy