A method is provided for reprocessing a petroleum-based waste oil feedstock into diesel fuel. The method includes forming a treated feedstock by (a) filtering the feedstock, thereby removing solids and metals from the feedstock, and (b) dehydrating the feedstock; vaporizing the treated feedstock to produce an oil vapor; passing the oil vapor through at least one catalyst bed and subsequently through a cooler, thereby converting the oil vapor to a hydrocarbon liquid product with a diesel product boiling point range; and removing contaminants from the hydrocarbon liquid product, wherein the contaminants are selected from the group consisting of particulates and color precursors.

A method for cleanup of circulated rolling oil including gravity separation followed by size separation. The method includes supplying the circulated roiling oil to a separation chamber of a rotating centrifugal rotor and separating water and solid debris from the circulated rolling oil by centrifugal force. Oil, oil-water emulsion, and some residual debris may be recovered and supplied to a ceramic membrane having a pore size of 1.5 micron or smaller. A purified oil sample is recovered from the membrane, along with a reject including the oil-water emulsion and residual debris. The reject may be further concentrated by gravity separation and recycled to the membrane to recover further amounts of oil.

A process for the enhancement of the byproducts of a process for the regeneration of exhaust oils is described, wherein said process for the regeneration of exhaust oils which includes at least one of the following steps: a) passing of the oil to be regenerated into one or more centrifuges, b) storage of the oil, before treatment, in suitable containers, c) desiloxanation and d) filtering. The byproducts of one or more of steps a) to d) are treated, gathered and mixed with one another and added to the bitumen coming out as tail of a fractioned distillation step of the above-said regeneration process of exhaust oils.

A plant for the carrying out of a process according to any one of the preceding claims is also described, comprising a processing unit for each of the byproducts coming from steps a) to d) and a mixer (6) with stirring (7).

Provided herein are systems and methods for removing halogens and sulfur from used oil. The used oil is heated and aerated, followed by rapid vaporization and cooling. The cooled oil is then subjected to an electrical field before being filtered.

A high throughput, positive pressure, gravity operated dewatering system for hydraulic fluids, lubricating fluids, and petroleum based fluids comprises a gravity operated dewatering chamber receiving the industrial fluid and a source of positive pressure drying air coupled to the dewatering chamber.

The present invention is characterized by comprising: a main unit which incorporates a fuel-inflow port for fuel oil supply, a fuel-discharge port for discharging fuel oil that has finished being refined and a drainage discharge pipe for collecting and discharging untreated fuel oil, and a sludge box for storing sludge that has been separated out from the fuel oil; an ultrasound tank which receives fuel oil supplied from the fuel-inflow port, and adjusts the particle size of the fuel oil and the viscosity and surface tension of the fuel oil by means of ultrasound; a vacuum chamber which receives fuel oil supplied from the ultrasound tank, and of which the inside is maintained in a vacuum state such that the specific volume and the surface area of the fuel oil are maximized via a baffle panel; a water-fraction elimination tank of which one side is connected to the vacuum chamber and the other side is connected to a vacuum pump, and which eliminates the water fraction from the fuel oil by using air heated to a high temperature and the reduced pressure of the vacuum state created due to the vacuum chamber; an oil-refining filter which receives fuel oil supplied from the vacuum chamber and filters the received supply of fuel oil by means of centrifugation so as to trap sludge contained in the fuel oil; an ion chamber which eliminates and bums particles including fine foreign matter remaining in the fuel oil in the state after the sludge has been eliminated; and a control panel which is constituted on one surface of the main unit, sets the operating conditions of the ultrasound tank, vacuum chamber and water-fraction elimination tank, and controls whether to provide power for refining the fuel oil.

A system and process for recycling machining waste into a solid/scrap material component and a recyclable machining coolant. The system and process comprise collecting the waste machining waste and mechanically separating the machining waste into a solid/scrap material component and a machining waste liquid component. The machining waste liquid component is decanted to separate oils and solids from the recyclable machining coolant. The machine recyclable machining coolant is then filtered through at least a first filter and preferably a second, finer mesh filter. The recyclable machining coolant is then exposed to UV light to kill bacteria and microorganisms. Lastly, ultrapure water is added to dilute the recyclable machining coolant and form the recycled machining coolant. If desired, a virgin machining coolant can be added to the recycled machining coolant, to replenish any additive(s) stripped during the recycling process, prior to resale of the recycled machining coolant.

In a method and a system for purification of contaminated oil, the contaminated oil and a liquid separation aid are provided in a mixing tank and then mixed into a mixture. Thereafter, the mixture is filtered.

The present invention is a solid lubricant treatment medium, usually but not always in bead form, suitable to be brought into contact with lubricants to remediate and to condition them. A key feature of the medium, typically a polymeric resin, is the presence of relatively very large pores, which are able to capture and remove fine lubricant contaminants and breakdown products (such as small phosphate ester varnish, soot, coke, dissolved metal or other small semi-soluble or insoluble particles), Resins and adsorbents of the prior art have proven unable to remove fine contaminants like phosphate ester varnish that have a deleterious impact on industrial equipment performance and reliability. The mean pore size diameter of the medium is between about 8,000 Å and 100,000 Å and, more preferably, in the range of about 20,000 Å to about

A method for eliminating legionellae from water of a cooling circuit of industrial plants, in particular of a hot rolling mill, is disclosed. The water is loaded with organic substances and inorganic particles. In a further aspect, the use of bacteria for eliminating legionellae from a water of a cooling circuit of an industrial plant is disclosed.