Ref. 11020-9

MICROPPALOIL non-miscible liquids separator
Small sized = reduced space required
Diaphragm pneumatic pump = safe working without electric cables, self-priming pump
Working under reduced pressure = indifferent level positioning, in charge or discharge

Height : 50 cm Diameter : 42cm

The « MICROPPALOIL » device is designed in view of continuous
separation of compounds of 2 non-miscible liquids of different
densities; for example: water / hydrocarbon, water / fat, cutting oils
(emulsions) / hydrocarbons; waste water / hydrocarbons.
The result, after separation, is obtaining water or water based
emulsions without any hydrocarbons and hydrocarbons without any
water, whatever the percentage of components of the compound to be
treated could be.

The separation process is based on the difference of density between
the two liquids to be separated and their non-miscible property, i.e.
decanting the liquid to be treated in the upper part of the « resting
chamber » (without any turbulence), in order to get the lighter liquid
floating on top of the denser one. This is not a gravity device.

Once the dense phase decanted, (usually aqueous), it is recycled in the
effluents separation tank, whilst the light phase trapped in the upper
part of the « MICROPPALOIL » device is floating and consequently
can be decanted at any time, in accordance with the needs of the user.
Saturation of light decanted phase in the « MICROPPALOIL »
device, due to lack of draining by the user, does not lead at all to any
outflow on the floor, but only a backflow to the primary effluents
separation tank.

Draining the light phase (whilst the device is working), does restart
without any further action the separation of the non-miscible liquids.

The pumping of liquid to be treated is performed by means of a
floating surface strainer.

Unlike oil separators – most often based on separation of non-miscible
liquids by coalescence – the capacity of the « MICROPPALOIL »
separator is not calculated on the quantity of water carried off, but on
the quantity of oil which can be extracted from the liquid matrix,
without any output adjustment of light or dense fluids, whatever the
concentration of oil, water, or cutting emulsion to separate (in case of
machine tools) might be, what does reduce the quantities of fluid to be
treated in order to obtain the same result, as well as the consumption
of energy in proportion to the output.

Thus a « MICROPPALOIL 110 », has the capacity to « extract »
110 litres oil (or light fluid) per hour for a nominal output of 1.8 litre /


The device operates without any moving part. There is no coalescence
filter (union of droplets of an emulsion) and it operates under reduced
pressure, the latter corresponding to the desired discharge height,
within the capacity limits of the diaphragm pneumatic pump, i.e. at
least 10 metres water column (at the discharge) for an aspiration of 5
metres (the pump being self priming).
(It has to be stressed out that the concerned pneumatic pump is
indicated as for 7 bar at the discharge).
The efficiency of the process allows reducing significantly the volume
of the device (diameter / height).


  • The floating suction strainer, which does pump the liquid to be treated, is made of
    polypropylene; its buoyancy is adjustable in accordance with the density of the liquid to be treated
    and the desired liquid output.
  • The oil separator body is made of stainless steel 316L (other materials upon request).
  • The pump is a « diaphragm without pulsation damper » type pump, appropriate for processing
    any type of fluid. An electrically driven pump can be fit upon specific request.
  • All components of the micro oil separator are readily removable in order to make maintenance
    processes easier.
  • The peripheral devices (pneumatic diaphragm pump, particle filter and adjusting devices of
    pump compressed air feeding), are fit on the stand of the « Microppaloil 110 » by means of
    neodymium magnets, which do guarantee a full adhesion of the whole, every single
    component being then dismantled without any effort nor tool in view of the maintenance of
    the 1.000 microns stainless steel particle filter, the replacement of the diaphragms about every
    two years, or for a simple « grooming » of the separator’s body at user’s request.
  • The connecting pipes are set up with nitrile joints which are hydrocarbon resistant and don’t
    need any tools in order to be fixed or replaced, if need be.

Some data regarding the fluid mechanics, determining design, operation and
performance of the MICROPPALOIL non-miscible phases separator.

It has to be considered, to start with, that all the walls of the hydraulic circuit of the
MICROPPALOIL device are exclusively made of "smooth" materials in order to minimize as far as
possible roughness that generates turbulences which are detrimental for separation of non-miscible

A floating strainer made of polypropylene is used for pumping the aqueous effluent; this choice has
been determined by the latter’s density (less then 1), and the chemical inertness of this material
towards the media encountered in metalworking fluids.

The floating strainer allows, as a priority, the elimination of the surface fluid (light liquid
phase), without introducing any air into the suction pipe of the effluent, which is not a compulsory
condition for the appropriate working of the MICROPPALOI, which has in its upper part an
automatic air valve, as far as the device is working under reduced pressure.

The input of the effluent in the separator of non-miscible phases is operated by using a diaphragm
pump without any need of a pulse dampener; this type of pump has been chosen in order to operate at
a maximum rate of 10% of the nominal flow, using the balance between pressure and flow of the fluid
at the outlet of the volumetric pump and thereby reducing considerably the wear of diaphragms and
providing to them an exceptional longevity.

The device operates consequently without electrical power. If requested, the treatment programming
can then be performed by opening or closing the outlet pipe of the pump - without any risk of
damaging the equipment – by means of a self-contained programmer (without any power feeding
unit), which is not supplied.

The MICROPPALOIL operating system is regulated by the mechanics of so-called non-Newtonian
fluids, i.e. in other words when their deformation is directly proportional to the force applied to them;
they are characterized by a coefficient of viscosity dependent on pressure and temperature.

The temperature being considered uniform on the whole hydraulic piping system of the non-miscible
liquid phases separator, and as far as an infinitesimal increase in pressure can take place only at the
level of the ball valve of the pump, the fluid flow is considered « uniform », irrotational (without
vortices), which doesn’t generate any multi-phase outflow.

That induces an almost laminar, even flow, in accordance with the separation of non-miscible liquid
phases; it may be almost transient during the warm season, given the presence of oil and water, but
never turbulent.

The information of the following tables can be modified, without any notice, according to the
technical developments of the products presented :


Note: only the original parts do guarantee a good working of the non-miscible liquid phases separator, particularly the parts of the diaphragm pneumatic pump. Any non original part fit onto the « Microppaloil », releases the responsibility of the manufacturer and renders the guarantee null and void.


The level gauge (vertically fit on the outside of the upper body of the « MICROPPALOIL » non-miscible liquid phases separator), is a polyamide gauge and has in no case at all to be brought in contact with alcohol, or with products containing alcohol, as for example some maintenance and surface cleaning products (particularly for windows and mirrors).

Technology: patent pending in Switzerland.