Brofind’s long-standing experience allowed us to install these units in a variety of industrial fields (printing, flexible packaging, adhesive tape, chemical, etc.) with treatment potential ranging from a few hundred to thousands of kg/h.

Features and advantages

All of the plants we supply have the following features and advantages:

  • Turnkey supply;
  • Tailor-made design and optimisation of the plant according to the customer’s requirements, on a case-by-case basis;
  • Selection of the materials used based on the application and the involved solvents;
  • Customised design in case of reduced space available;
  • Maximisation of energy efficiency by means of specific heat recovery units;
  • Control panel with PLC for automatic management of the plant, designed for remote monitoring services.

Operating principle

Being a product finishing unit, they are always designed tailor-made to enhance performance and reduce costs according to the customer’s requirements.

In particular, the following configurations can be made:

  • Batch or continuous operation
  • Configuration on single column or on several columns in series, working at different pressures

Distillation on a single column with batch operation (discontinuous) minimises the cost of the initial investment, while maintaining considerable management flexibility according to the stream to be treated. This solution is applied frequently especially when there are low incoming solvent flow rates. Distillation on several columns allows for continuous operation suitable for production with high solvent flow rates.

At the same purity level as the recovered solvents (selectable depending on the customer’s requirements), the configuration with several columns operating in series provides the following advantages:

  • Possibility of operating the various columns at different pressures to obtain different fractions from the fed solvents
  • Less specific energy consumption
  • Possibility of recovering energy from the various involved streams

This configuration is generally preferred for more significant solvent flow rates

Plant engineering solutions

Case 1 – Distillation on solvent recovery plant regenerated with inert gas

The solvent recovered in plants regenerated with inert gas (nitrogen), for example in the flexible packaging printing sector, is often mixed (acetate, alcohol) with traces of water or other impurities.

For high solvent flow rate, often continuous distillation with 2 or 3 columns is chosen:

– The first column allows you to remove impurities (water, high boiling components, acetic acid) from the bottom, together with a reduced amount of solvent; the top fraction is transferred to the second column.

– The second column recovers pure acetate from the bottom, with an acetate azeotrope + alcohol at the top.

– The third column, when present, removes part of the acetate (to be recycled upstream) to enhance the purity of the recovered alcohol.

Some heat recovery exchangers increase the overall energy efficiency, preheating the supply with outgoing hot products.

It is also possible to use a single heat exchanger as a condenser of the first column and reboiler of the second, further increasing the energy recovery and simplifying the plant layout.

Whereas with low incoming solvent flow rates, the solution of a single batch column does the work of the first two columns, reducing the investment cost.

Case 2 – Distillation on solvent recovery plant regenerated with steam

For solvents coming from recovery plants regenerated with steam, its decanter separates the aqueous phase from the organic phase.

A distillation column could be necessary to treat the organic phase, if several solvents which cannot be mixed with water are fed simultaneously, for example toluene and hexane in the adhesive tape production process. A single column can separate the two solvents, with excellent performance and low consumption.

Solvents which can be mixed in water treated in steam systems represent a more complex situation.

Several columns in series are necessary to achieve effective separation of the organic compounds from the water and to increase its purity.

Services provided

Choosing Brofind means:

  • Customer assistance 24/7
  • Impartiality in recommending pollution control technologies since Brofind is owner of many of them
  • Experience in the design and manufacturing of abatement plants since 1993

See the page dedicated to Brofind services to understand how we support our customers during the entire lifecycle of the product.

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