Autopress (AP)

For absolutely gas-tight and safe filtration

With the BHS Autopress (type AP) even suspensions that are difficult to filter can be efficiently separated in batch mode. The Autopress works like a filter press but is also completely gas-tight and is fully automatic, including cake discharge. The filter can be integrated into a completely contained and enclosed process (also GMP compliant) and meets all requirements regarding sterility, explosion prevention, workplace safety and validated process operation.

After it is formed, the filter cake can be washed, extracted, compressed, blown out and dried. The thinness of the cake and the complete filtration without any residues ensure high throughput rates. As an additional benefit, the filter cake has a low residual moisture content. The BHS Autopress washes the cake efficiently, ensuring a pure product without any cross-contamination.

Process criteria:

Mode of operation batch
Operating pressure up to 10 bar (g)
Operating temperature up to 150 °C
Solids content (suspension) up to 10% (weight)
Cake thickness up to 15 mm
Particle size 0.5 - 50 μm
Filtration capacity (suspension) up to 5 m³/m² h
Filtration capacity - dry solid -
Active filter area 0.2 - 10 m²
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Brochure "Autopress" (PDF / 1.2 MB)
Brochure "Autopress"

Product brochure "Autopress (AP)"

Size: 1.2 MB
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Advantages

  • Batch production
  • Several successive process steps
  • Self-contained, gas-tight production
  • Suitable for suspensions containing solvents
  • Excellent workplace hygiene and safety
  • Validated operation, suitable for pharmaceutical final products
  • Fully automatic operation

BHS filtration technical center

Link to tests at BHS technical center

Technical article

Clean-in-place operations for thin-cake filtration technologies

May 2005
May 2005
PDF (328 KB)
Clean-in-place operations for thin-cake filtration technologies

This article discusses the choice of thin-cake (2-25 mm) separation technologies and their benefits to optimizing the effectiveness of the production process. The paper continues with a discussion of clean-in-place operations to meet current Good Manufacturing Practices (cGMP) guidelines including riboflavin test and validations. ANSI/ISA S88 (and IEC 61512-1 in the international arena) batch process control system standards are also examined. Finally, factory and site acceptance testing is described.

Size: 328 KB
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Evaluating thin-cake pressure filtration using the BHS Autopress technology

April 2002
April 2002
PDF (1.6 MB)
Evaluating thin-cake pressure filtration using the BHS Autopress technology

Thin-cake pressure filtration technology offers an alternative to agitated nutsche filters and centrifuges for solid-liquid separation,cake washing, and drying. Complicating this process is the number of competing technologies and options that can be employed to accomplish these steps. For example, most pharmaceutical processes will use either an agitated nutsche filter or a centrifuge for the separation and washing step. This article discusses the use of the thin-cake Autopress pressure filter as an alternative to agitated nutsche filters and centrifuges. The results are applicable to specialty chemical and other applications with similar process crystals and requirements.

Size: 1.6 MB
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