Fiber and film industry

Reject recovery in the viscose process

Sustainability through efficient separation and filtration

During the filtration of the spinning solution in the viscose process, a reject stream is produced that contains not only impurities but also valuable product components. Efficient reject recovery is therefore crucial for minimizing raw material losses and increasing the process’s economic efficiency.

By combining ViscoFil centrifuges with LENZING OptiFil automatic backwash filters, Lenzing Filtration offers a perfectly tailored solution for processing viscose reject.

This increases yield, minimizes waste, and improves the overall environmental footprint.

Recovery of reject viscose with as little loss as possible.

The recovery of reject viscose requires the reliable separation of abrasive particles, gel particles, and other impurities from the high-viscosity solution, as well as the cost-effective recycling of valuable components back into the production process.

This not only increases resource efficiency and reduces product losses, but also eases the burden on wastewater treatment by reducing the volume of waste streams that need to be treated.

Efficient reject recovery through a coordinated two-stage process.

Under ideal conditions, the reject stream is treated efficiently and with minimal losses. The centrifuge reliably removes the majority of solids, while a downstream LENZING OptiFil system efficiently separates out any remaining fine particles and gel.

The filtrate achieves a consistently high level of purity and can be recycled back into the dissolution process.

The result is a stable, continuous process with maximum product yield, minimal losses, and high plant availability and cost-effectiveness.

The solution: LENZING OptiFil & ViscoFil-Centrifuge

Efficient reject recovery through a coordinated two-step process.

  • < 1 ppm Filtrate quality
  • < 0.1 % Product loss
  • withoutfilter aids
Simplified process diagram showing the installation of a LENZING OptiFil system together with an ViscoFil centrifuge.

Reject recovery in the viscose process

Advantages of reject recovery in the viscose process using the ViscoFil-centrifuge and LENZING OptiFil.

Maximum product yield

Material recovery improves cost-effectiveness.

Sustainable process management

Processing and recycling rejects reduces waste and emissions.

Optimized filtrate quality

Polishing filtration ensures stable process conditions.

High system availability

Continuous, automated operation.

Long service life

Wear protection extends service life when dealing with abrasive particles.

LENZING OptiFil

The LENZING OptiFil system is a reliable backwash filter for the finest filtration of industrial fluids and in water treatment. Its patented backwash system enables maximum process continuity with minimum backwash quantities.

High backwash efficiency (patented)
Filter fineness down to 1 μm
Very high throughput rates
Completely closed system

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Are you looking for sustainable solid-liquid filtration solutions for your individual process? Our experienced team looks forward to supporting you with your project.

Team Lenzing Filtration

Team Lenzing Filtration

Innovation flows

[email protected]

+43 7672 701 3479

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