The present invention provides method for separating contaminants from a liquid mixture comprising the steps of a) providing a feed of said liquid mixture to be purified, b) adding a separation aid to the liquid mixture to be purified, wherein said separation aid is capable of binding said contaminants and c) supplying a flow of compressed air into said feed after step b) has been performed to provide a feed comprising air. The method further comprises steps d) removing air from said feed comprising air to provide a deaerated feed; and e) supplying said deaerated feed to a separator, and f) separating a phase comprising contaminants and said separation aid from said liquid mixture in said separator, wherein the separation aid added in step b) is insoluble in said liquid mixture at the separation conditions in step f). The present invention further provides a system for separating contaminants from a liquid mixture.

A purification system and a method for purification of slop oil and industrial emulsions, wherein the purification system can handle two processes in parallel, a slop oil purification process and an industrial emulsion purification process, said system comprising: —at least one slop oil centrifugal separator (5) into which slop oil is provided for separation of water and oil; —at least one emulsion centrifugal separator (25) into which an industrial emulsion is provided for separation of oil and water; —a first redirecting fluid connection (37, 37′) arranged for transferring oil separated from the industrial emulsion in the emulsion centrifugal separator (25) to the slop oil centrifugal separator (5) possibly via a slop oil tank (3).

The invention relates to a method for lowering the content of polycyclic aromatic hydrocarbons (PAH) in a used lubricant composition, in which said used lubricant composition passes over activated carbon, said method not comprising a solvent extraction step.

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 of treating cooling circuit water of industrial plants (2) contaminated with organic substances and inorganic particles, comprises the following steps: a) separating the organic substances and inorganic particles from the cooling circuit water to obtain precleaned cooling circuit water; b) cooling the precleaned cooling circuit water by an open cooling tower (11) to obtain cooled precleaned cooling circuit water; c) desalinating at least a partial volume flow of the cooled precleaned cooling circuit water by an desalination plant (14) to obtain cleaned cooling circuit water; and d) adding bacteria capable of degrading organic substances present in the cooling circuit water. The bacteria are added to the cooling circuit water before the separation in accordance with step a), before the cooling in accordance with step b) and/or before the desalination in accordance with step c), to form a biological cleaning stage.

The present invention relates to a method for efficiently regenerating waste lubricating oil and belongs to the technical field of waste lubricating oil recovery and treatment. The method for efficiently regenerating waste lubricating oil is provided to solve a problem that existing waste lubricating oil has a high metal ion content. The method includes: adding the waste lubricating oil into a reaction vessel, performing a stirring treatment under the action of a cuprous-containing catalyst to form an aggregate, and then performing filtration and separation to directly remove the aggregate, to obtain corresponding regenerated lubricating oil. The present invention can effectively realize separation and removal of a metal ion, directly filter and separate, avoid emulsification, and obtain high quality lubricating oil having a low total metal ion content.

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 and 100,000 and, more preferably, in the range of about 20,000 to about 80,000 .

The present invention relates to a pre-hydrotreatment and purification method for waste lubricating oil, the method comprising the following steps: mechanical impurities are removed from waste lubricating oil, and then the oil is subjected to flash distillation to separate free water and a portion of light hydrocarbons; a bottom product of the flash distillation column is mixed with hydrogen and a self-sulfurizing oil-soluble transition metal catalyst, and then enters a slurry bed reactor for pre-hydrotreatment; a gas product obtained by performing separation on a reaction effluent is subjected to adsorption purification and then enters a hydrogen recycle compressor for cyclic use; a liquid product obtained by performing separation on a reaction effluent is subjected to hydrocyclone separation and solvent washing to remove solid residue, and finally a purified lubricating oil component is obtained. The method of the present invention has such advantages as simple processing procedures, a high non-ideal component conversion rate, a high oil liquid yield, and good quality. In addition, the oil-soluble catalyst features simple dispersion, no need for vulcanization, a small catalyst adding amount, high low-temperature hydrogenation activity, and is capable of effectively preventing the coking that could occur during a process of preheating the waste lubricating oil, markedly extending the operational lifespan of a waste lubricating oil hydrogen treatment device.

A method for hydrotreating and recycling waste lubricating oil, the method comprising the two steps of slurry bed pre-hydrotreatment and deep hydrotreatment, specifically as follows: mechanical impurities are removed from waste lubricating oil, and then the oil is subjected to flash distillation to separate free water and a portion of light hydrocarbons; a bottom product of the flash distillation column is mixed with hydrogen and a self-sulfurizing oil-soluble transition metal catalyst, and then enters a slurry bed reactor for pre-hydrotreatment; a liquid product obtained by performing separation on a reaction effluent is subjected to hydrocyclone separation and solvent washing to remove solid residue, and then a pre-treated lubricating oil component is obtained; said component is mixed with hydrogen and then enters a hydrofining reactor, an isomerization-dewaxing reactor, and a supplementary refining reactor, connected in series, for hydrotreatment; and the reaction products are separated to obtain high-quality naphtha, diesel oil and a lubricating base oil. The method of the present invention has such advantages as simple processing procedures, a high oil liquid yield, good lubricating oil base oil quality, and can implement full-fraction resource utilization of waste lubricating oil. In addition, the oil-soluble catalyst features simple dispersion, no need for vulcanization, a small catalyst adding amount, high low-temperature hydrogenation activity, is capable of effectively preventing the coking that could occur during a process of preheating the waste lubricating oil, and ensures long-term stable operation of the device.

A purification system and a method for purification of slop oil and industrial emulsions, wherein the purification system can handle two processes in parallel, a slop oil purification process and an industrial emulsion purification process, said system comprising: at least one slop oil centrifugal separator (5) into which slop oil is provided for separation of water and oil; at least one emulsion centrifugal separator (25) into which an industrial emulsion is provided for separation of oil and water; a first redirecting fluid connection (37, 37) arranged for transferring oil separated from the industrial emulsion in the emulsion centrifugal separator (25) to the slop oil centrifugal separator (5) possibly via a slop oil tank (3).