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What Is the Best Method to Purify Oil?

There is no doubt that the machine and tractor stations or facilities that service oil-filled equipment always have to cope with the problem of used oil storage and disposal.  Generally, oil serves  as an insulating or lubricating fluid.

Dielectric transformer oil is used in the oil-filled electric power transformer, while motor, transmission, gear, hydraulic and industrial oils are mainly used in machines that have moving working parts that require lubricating oils and fluids.

It is clear that during its useful service life, any oil product loses its original characteristics.  The following is the list of the reasons for oil contamination:

(1)    extreme operating conditions such as high temperatures or impact load; and

(2)    impurities that get into oil during transportation or storage or as the result of the oxidation process.

Very often the impurities, accumulated in the oil, make it unfit for use before the end of the oil’s expected service life.  Undoubtedly, facilities and oil users have to seek ways to cope with this problem.  It makes no economic sense therefore, to purchase new oil each time because of the significant cost and labor involved.  Additionally, it may be troublesome for some enterprises to collect and store the used oil since it is prohibited to discharge it into the soil or water. An amazing fact, but true: One liter of motor oil is able to contaminate about a million liters of drinking water and render it undrinkable.

Every year, businesses and facilities generate millions of tons of industrial waste and the failure to manage this waste has the potential to cause a global environmental disaster.   The collection of waste will not contribute to the solution of this problem because the majority of enterprises do not have special storage areas for used oils.  Additionally, it is very expensive to deliver the used oil to used oil processors.  It is therefore, necessary to find new and revolutionary solutions with financial gains and reduced environmental risks.

So, the most optimal solution to this problem is to remove mechanical impurities and restore performance characteristics of the oil without the need to replace the oil.  According to the recognized classification that exists today, all mechanical impurities are divided into such groups as:

(1)    physical;

(2)    chemical; and

(3)    physico-chemical.

Unfortunately, there is no universal method of oil purification that is capable of removing all types of impurities.  We will consider therefore, all possible  purification methods that are applied to remove the particular types of impurities.

Water, gasses and mechanical impurities should be removed to restore the performance characteristics of the oil.  The reduction of the acid number takes place if oil product has been in service for many years without any type of purification processing.

Water Removal. Water may be removed from the oil by centrifugal purification, adsorption purification, and thermal-vacuum drying.  From a technical point of view, the centrifugal purification is driven by high powered centrifuges.  This purification method consists of separating different fractions of non-homogeneous mixtures when exposed to centrifugal force.  Perhaps one of the undeniable benefits of this type of purification is its relatively high water removal rate.

There are also some potential disadvantages that you should be aware of:

•    low purification rate;
•    the complexity of equipment and low operational reliability of the centrifuges; and
•    operator presence system.

Adsorption Purification is based on the ability of some substances to take up water and other impurities.  Though this method is characterized by a mostly trouble-free operation, it has the following disadvantages:

•    the need to dispose of adsorbers harmful to the environment;
•    high-quality inlet oil; and
•    low productive capacity.

Thermal-Vacuum Drying consists of separating water and oil because of their different boiling temperatures. The watery oil is supplied to the special low-pressure container where water evaporates at ambient temperature.

The following is a list of the advantages of thermo-vacuum drying:

•    high purification rate (up to 10 g/t);
•    high operational reliability and easy-to-use equipment; and
•    automated process.

A relatively small water removal rate is considered to be the only disadvantage of this method of purification.   Additionally, thermal-vacuum purification is also applied to remove gasses.

Removal of Mechanical Impurities.  Mechanical impurities, also known as particulate matter, can be removed after being subjected to centrifugal force.  Generally, not only mechanical impurities but also water is removed during this kind of purification that makes this method very widespread in industry.

Disadvantages of this method include:

•    purified oil product meets only 12-13 purity class; and
•    it is a labor intensive purification process.

Filtration is the method that has enjoyed a wide popularity in modern industry.  Based on the disposable filter, it ensures a high rate of purification, but needs to be replaced very often and may result in significant financial expenditures.  As an alternative, there are re-usable filters, though they will require regular cleaning. The acidity of oil may be reduced by applying adsorption purification.

GlobeCore  is an industry leader in manufacturing and supplying equipment for purification and regeneration of transformer, industrial, turbine, transmission and other types of oil products, including stove and diesel fuels.

GlobeCore’s equipment has been successfully operated in more than 70 countries of the world.  The fact that GlobeCore branded equipment successfully combines different methods of oil product purification shows it to have the best advantages that include:

•    high purification rate (10g/t –water, 0.1 % – gases);
•    simple design, high operational reliability and good endurance;
•  years of  trouble-free operation. The units can be operated both in automatic and semi-automatic modes to reduce the need of operator intervention;
•    Compact in size. All the units are mobile so that they are convenient to transport from one place to another; and
•    Eco-friendliness. The need to dispose of the exhausted Fuller’s Earth is reduced due to the Fuller’s earth regeneration mode that allows for Fuller’s earth reactivation directly in the equipment.

How to Choose the Best Oil Filtration System?

The choice of a product depends on various external factors.  Price, quality, performance, and reliability are just some the considerations when choosing a product.  The choice of industrial equipment also depends many of the same factors.

In choosing oil processing equipment, you will find that there are many different types of processing units intended for purification of different petroleum based oils  and fluids.

There are a large number of manufacturing companies specializing in oil processing systems. These systems include a wide range of equipment used to process different lubricants, hydraulic and turbine oils, and complex systems for oil regeneration.

The purchase of equipment for the filtration and purification of used oils is justified through the saving of money and resources.  Additionally, this equipment greatly helps in reducing problems with equipment failures and downtime, as well as reducing environmentally harmful waste oil products.  Overall, these modern machines greatly increase the service life of industrial equipment.

When choosing the right processing equipment for your business, strict attention should be paid to the technical specifications of the filters that will be used by the processing equipment:

  1. The physical size of the oil filter. This key component of the purification system must be small enough to save space and weight, but have high filtration performance in both volume and filter fineness;
  2. Filter Test Results.  Oil filters can be monitored in various ways, but one of the most common methods is the beta-factor test.  The beta factor is calculated by dividing the number of the larger particles trapped in the filter medium by the number of particles of the same size downstream of the filter.  For example, if the beta ratio is 10:1, it means that for every ten (10) particles that enter the filter, only one (1)passes through the filter without being trapped in the filter medium;
  3. Pore ​​size of the filter medium; and
  4. Performance and rate  flow.

According to studies conducted by General Motors, and published by the Society of Automotive Engineers (SAE), it was determined that the service life of an engine can be increased eight times by using five (5) micron filter mediums instead of the standard 40mm filter medium found in most massed produced automotive oil filters.

This means that the steady improvement of oil filtration systems will continue as the cost of new equipment rises and consumers demand better equipment with longer service lives.  There is an old saying that contends that oil does not wear out, it only becomes dirty.  In any case, keeping oil clean and free from contaminants and moisture will greatly extend the service life of your electric power equipment and hydraulic systems.

The traditional oil change therefore, is no longer necessary.  The high tech equipment available from GlobeCore can keep your insulating oils and hydraulic fluids in new like condition indefinitely.  Oil Processing units from  GlobeCore remove soot and sludge, dirt, moisture and dissolved gases.

If however, you decide to invest in oil processing equipment, it is worth taking the time to carefully consider your needs.  You will soon learn that not all systems for filtering oil are created equal.  Sometimes, bright brochures are specifically designed to confuse the customer.  As the consumer and business manager, you should make sure that filtration and processing equipment has passed all the necessary tests and has verified results of performance.  Here at GobeCore, we work with our customers to determine the best equipment that meets the needs of our customers.  GlobeCore has a very large and diverse line of oil processing equipment.  We work very closely with our customers so you get the best and most cost effective equipment to compliment the needs of your business.

Complete purification of I-12 industrial oil

I-12 industrial oil is a general purpose oil with no additives. It is made from sweet crude by selective purification.

This oil is used for lubrication of bushings of straight bar and linking machines, spindles of metal cutters, bearings of low power electric motors, and as an operating liquid in positive displacement of hydraulic drives operated indoors.

Combined purification methods of I-12 industrial oil are based on simultaneous influence of several electrical fields or a field with filtration.

The principle of combining electric field influence and centrifical force is implemented in cyclone separators and centrifuges equipped with a special electrical device.

By design, a triboelectric centrifuge purifier is a multifoil rosette with two chargers that create opposite charges in the industrial oil.  The passes through the swirler in a translational-rotational movement.  It them passes the oil through a circular ring space. Due to friction with barriers, contaminants become oppositely charged. Centrifugal force moves particles with a positive charge to the outlet wall where they are coagulated with negatively charged particles.  The charges are neutralized in the coagulated particles.

Then by the force of gravity and inertia, the particles are deposited in a special settling tank.

Comparing hydrocycling efficiency with that of a similar machine equipped with chargers, the chargers are 40% more efficient on average.

When using centrifuges with electrifying devices, the electric field may be obtained by voltage from an external source or by a triboelectric effect.  The triboelectric effect occurs due to rotor friction against special bars.  The rotor is made from a special dielectric material. (Plexiglas, PTFE, or some other dielectric material )

It is also possible to combine centrifugal force with a magnetic field.  It is done by installing permanent magnets into centrifuge systems to capture ferromagnetic particles. Diamagnetic and paramagnetic contaminants are only influenced by the centrifugal force.

The most widespread of combined industrial oil purification systems are devices combining elecrtric fields and filtration effects.  These include magnetic filters, filtering centrifuges and vibration (acoustic) filters.

In centrifuge filtration, the centrifuges operate at relatively low rotation speeds. Contaminants may be removed from the rotor either continuously or occasionally.

A magnetic filter is free from such a disadvange of magnetic purifier as selective removal of only ferromagnetic particles.  Such devices, beside permanent magnets, use special filters capturing non-magnetic contaminants.  An additional filter element (usually a metal mesh) protects the surfaces of the magnets from tar, sediment and other products of hydrocarbon oxidation.

In vibration filters the oil passes through a vibrating porous membrane.  The vibrations prevent sedimentation of contaminants on the surface and reduce hydraulic losses, increasing the filter’s service life.

It should be noted that the combined methods of purifying oil products are not widely used at this time due to the complexity of purifier design.