Oil mist and oil vapor filtration plant

Suction and abatement of oil mist

Application 1: metal treatment

The customer was one of the first Italian companies to adop vacuum technology in the heat treatment sector. It has been in the Italian and European markets for over thirty years and performs treatments of: steel hardening, brazing, sintering, plasma nitriding, surface hardening, annealing and PVD coating processes. The main fields of application are the sectors: aeronautics, underwater equipment, racing, gas turbines, molds and food.


The thermal and thermo-chemical treatments in the absence of oxygen carried out by the customer company on metals, involve the emission of oil vapours from the current value of 20 mg/Nm3 to 10 mg/Nm3. Tecnosida® was contacted to solve this situation by designing a plant able to connect and interact with their existing treatment system (located on the factory roof).

Coalescence filter for oil mists abatement:

Tecnosida®, after adequate technical inspection, recommended the installation of an Oilscreen filter that, by using the coalescence filtration technology, separates and collects the microscopic oil particles present in the emissions, allowing the customer’s goal to be reached.

In detail, the coalescence is the physical phenomenon through which the drops of a liquid or a gaseous substance, are combined together to form larger drops. Oilscreen uses this principle to facilitate the elimination of oily particles from the gaseous stream.

The filter uses a special surface that promotes contact of oily droplets in order to create the phenomenon of coalescence (and, consequently, the aggregation of the particles). Once grouped together, these drops tend to fall down by gravity, towards the lower part of the filter where the oils are then collected for disposal. The treated effluent, purified by these oily substances, is then aspirated by the fan and sent toward the eject chimney.

Oil mist filter

The main advantages of the system realized for our customer are:

  • high filtration efficiency;
  • external insulation that avoids the phenomenon of condensation;
  • recovery of the pollutant;
  • resistance over time;
  • compactness

Tecnosida® plant is realized in compliance with the BAT (DC.CF.01). It reduces the emissions within the limits established by law, solving the problem of our customer.

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Application 2: production and use of synthetic monomers

The customer is a leading company in the production of non-woven fabric (TNT – NONWOVEN) for various uses, including personal hygiene, industrial use, clothing, wallpapers, agriculture, etc.

In short, NONWOVEN, instead of being woven on a loom, is made of a polymer (generally polypropylene / PP or polyester / PET) which is melted, spun and distributed as a continuous thread by extruders in such a way that the threads cross each other in a random manner. Finally, a heated cylinder (roll stack) makes the fibres bind together and gives them the characteristic square or oval “pitting” that makes the fabric soft and at the same time durable.

During the production process, synthetic monomers such as polypropylene are used at high temperature, creating emissions that can be defined “polymeric vapours”, or oily mist emissions that are difficult to treat as their physical properties change with the temperature.

Plant for the removal of polymeric vapors:

Tecnosida® proceeds to the technical inspection at the customer’s site and, once the problems and the peculiarities present in the production process are highlighted, proposes the construction of a plant specifically designed according to company needs and composed of:

  1. filtering chamber for the containment of the cartridges and differential pressure switch;
  2. lower tank for collecting oily condensate

The filter has been realized in the version for outdoor use in low temperature environments. It is equipped with a temperature regulator and special insulation, in order to minimize the impact of the cold winter temperatures on the physical state of the effluent to be treated. In particular, the insulation was made of rock wool with a thickness suitable to avoid the phenomenon of condensation and was applied to all the parts exposed to the external environment (filter and pipe);

  • External oil-tight pipe, made of Aisi 304 stainless steel, flanged and insulated for the introduction of the air flow to be treated;
  • Installation of a jib hoist for the maintenance / replacement of coalescence filtering cartridges with total weight, in the operation phase, exceeding 250 kilograms each.
Insulated oil mist collector

Tecnosida® plant is realized in compliance with the BAT (DC.CF.01). It reduces the emissions within the limits established by law, solving the problem of our customer.