550results about "Refining by filtration" patented technology

Systems and methods for methods and systems for reducing contaminants in a feed stream are disclosed. Prior to reaching or upstream from one or more compressors, solid foulant is filtered from a feed stream. The compressor may further filter the feed stream. By reducing the solid foulant entering the one or more compressors, performance and life span of the one or more compressors also can be increased.

Systems and methods for processing a mixed plastic waste feed to produce a hydrogen-rich hydrocarbon product, such as synthetic crude oil or pyrolysis oil, by processing the mixed plastic waste feed through two cracking units. The first cracking unit is operated at a temperature and a residence time sufficient to at least partially depolymerize the plastic polymers in the mixed plastic waste feed to produce a molten oligomers product stream also containing inorganic components from the mixed plastic waste feed and a gas stream. This molten oligomers product stream is further processed in a thermal or a catalytic cracking unit to produce a hydrocarbonaceous stream that is processed to produce the hydrogen-rich hydrocarbon product, such as a synthetic crude oil that can be processed in a refinery or a pyrolysis oil that can be fed to a steam cracker.

The invention relates to the technical field of petroleum filtering, in particular to a petroleum filtering device and a using method.The petroleum filtering device comprises a filter body, a data collecting assembly and a data processor, and the data collecting assembly obtains petroleum state data of a liquid inlet and a liquid outlet of the filter body within a target time period; the data processor obtains suspected abnormal state data in the petroleum state data and corresponding suspected moments, and based on the suspected abnormal state data of all the suspected moments, target suspected pollution degrees of all the suspected moments are obtained; based on the numerical value change trend and the time continuity of the target suspected pollution degree of all the suspected moments, the pseudo-abnormal degree of the target time period is obtained, then the real pollution degree of the cut-off moment of the target time period is obtained, the next backwashing moment is obtained according to the real pollution degree, the accuracy of the backwashing moment is improved, and the backwashing efficiency is improved. And finally, the accuracy of backwashing starting control is improved, and the efficiency of the petroleum filtering device is improved.

The present invention belongs to the technical field of oil extraction and provides a sand fracturing wellhead device, comprising a main pipe, a branch pipe connected to the side of the main pipe, a mounting ring slidably installed in the branch pipe, and a second telescopic member fixedly installed in the branch pipe to drive the mounting ring to move, the mounting ring and the branch pipe are coaxially arranged and the outer side of the mounting ring is in sliding contact with the inside of the branch pipe, a first filter is fixedly installed in the mounting ring, and a temporary storage box is provided on the branch pipe, the temporary storage box is located on the outside of the branch pipe and a storage box and a connecting groove are fixedly installed at both ends of the temporary storage box, and the connecting groove is connected to the branch pipe. Compared with the prior art, the beneficial effects of the present invention are as follows: impurities on the first filter screen will fall off the first filter screen due to speed reasons, and at the same time, the oil flowing into the connecting groove will drive the impurities that have fallen off the first filter screen into the temporary storage box, thereby achieving the cleaning of impurities on the first filter screen, and the cleaning of the first filter screen can be achieved without stopping the transportation of oil.

The present invention relates to a process for the treatment of a plastics pyrolysis oil, comprising:a) the hydrogenation of said feedstock as a mixture with at least a part of the liquid effluent resulting from stage c) and in the presence of hydrogen and of a catalyst at a temperature between 14° and 340° C.;b) the hydrotreating of said hydrogenated effluent in the presence of hydrogen and of a catalyst;c) a separation of the hydrotreated effluent operated at high temperature and high pressure, in order to obtain a gaseous effluent and a liquid effluent, a part of which is recycled upstream of stage a),d) a separation operated at low temperature and high pressure and fed with the gaseous effluent and the other part of the liquid effluent resulting from stage c) and an aqueous solution, in order to obtain a hydrocarbon effluent.

Belonging to the field of petrochemical engineering, the invention discloses a catalytic slurry oil purification device, which comprises a tank body, and a feed end and a discharge end respectively arranged at two ends of the tank body. An upper partition plate and a lower partition plate are fixedly connected to the inner wall of the tank body, a discharging opening is formed in the upper partition plate, and a feeding opening is formed in the lower partition plate; the interior of the tank body is divided into three independent cavities by the upper partition plate and the lower partition plate; according to the scheme, the filter element is sleeved with the hollow cylinder, and the rotatable first spiral flow deflector is further arranged between the inner wall of the hollow cylinder and the outer wall of the filter element; a rotatable first spiral flow deflector is further arranged between the inner wall of the hollow cylinder and the outer wall of the filter element; a shear force generated by rotation of the first spiral flow deflector can prevent a filter cake on the surface of the filter element from forming a compact thick layer; a filter cake layer can be controlled within a relatively thin thickness range, and the rising speed of the pressure difference is delayed, so that the operation duration of a single filtering period is prolonged; and the single-time continuous treatment capacity of the device is greatly improved.

The invention belongs to the technical field of oil exploitation, and provides a sand-prevention fracturing wellhead device which comprises a main pipe, the side face of the main pipe communicates with a branch pipe, a mounting ring is slidably mounted in the branch pipe, and a second telescopic part for driving the mounting ring to move is fixedly mounted in the branch pipe. The installation ring and the branch pipe are coaxially arranged, the outer side face of the installation ring is in sliding contact with the interior of the branch pipe, a first filter screen is fixedly installed in the installation ring, a temporary storage box is arranged on the branch pipe and located on the outer side of the branch pipe, a storage box and a communicating groove are fixedly installed at the two ends of the temporary storage box respectively, and the communicating groove communicates with the branch pipe. Compared with the prior art, the device has the following beneficial effects that impurities on the first filter screen can be separated from the first filter screen due to the speed, meanwhile, petroleum flowing into the communicating groove can drive the impurities separated from the first filter screen to enter the temporary storage box, and cleaning of the impurities on the first filter screen is achieved; and the first filter screen can be cleaned without stopping petroleum conveying.

The invention discloses an adjusting and optimizing filtering method and system for a petroleum filtering device, and relates to the technical field of petroleum filtering, and the method comprises the following steps: initially checking and establishing a petroleum feature set; and inputting the petroleum feature set into a filter screen setting model to generate a filter screen configuration result. And key adjustment parameters of the petroleum filtering device are established. Big data is called through a petroleum feature set, a fitness function is constructed, data selection is performed based on the big data and in-plant control data, and a solution space and an initial solution set are established. And evaluating the initial solution set based on a fitness function, performing iterative screening, and establishing an optimal solution identifier and an inferior solution identifier. And performing initial solution set reproduction and solution space variation through optimal solution and inferior solution identification, and executing initial solution set iteration. And generating an optimization result according to the iteration result, and performing tuning filtering treatment according to the filter screen configuration result and the optimization result. Therefore, the technical effects of improving the adaptability of the petroleum filtering device and improving the filtering efficiency are achieved.

Provided herein are methods and systems for decontaminating and converting a mixed plastic waste feed to a hydro-gen-rich stream suitable for hydrocarbon refinery processing. Methods include the depolymerization of mixed plastic waste, removal of inorganic and metal contaminants, and feeding to one cracking unit or several cracking units in series. The products of the hydrocarbon refinery processing are high value chemicals such as C2-C4 olefins and benzene, toluene, xylenes, and ethyl benzene.

The invention discloses a petrochemical engineering pipeline filter, which relates to the technical field of filters, and adopts the technical scheme that the petrochemical engineering pipeline filter comprises a shell, and a filtering mechanism is arranged in the shell; the filtering mechanism comprises a cylinder, the cylinder is arranged in the shell, two sides of the cylinder are fixedly provided with two fixing blocks, the fixing blocks are fixedly connected with the inner wall of the shell, the bottom of the cylinder is provided with a filtering plate, two sides of the cylinder are fixedly provided with clamping plates, the clamping plates are buckled with the filtering plate, the clamping plates are fixedly connected with the filtering plate through bolts, and one side of the cylinder is fixedly provided with a slag discharging pipe; the filter has the beneficial effects that the problem that a traditional filter needs to be frequently replaced due to blockage of the filter plate is effectively solved, the filtering efficiency and the continuity of equipment operation are greatly improved, and the filter is convenient to use and high in practicability. And the arranged auxiliary filtering mechanism can continuously filter crude oil while the filter plate is cleaned, so that the continuity and the stability of petroleum transportation are ensured.

The utility model relates to the technical field of recycling, and provides a waste mineral oil recycling auxiliary device which comprises a bottom plate and a barrel body arranged above the bottom plate, and further comprises a hollow circular truncated cone fixedly installed at the bottom of the inner wall of the barrel body, a filter barrel movably arranged on the outer surface, close to the top, of the hollow circular truncated cone in a sleeving mode, and a filter screen fixedly installed on the outer surface of the hollow circular truncated cone. A rotating shaft is movably embedded in the center of the top of the barrel body, one end of the rotating shaft is fixedly mounted in the center of the top of the filter barrel, and a servo motor is fixedly mounted in the center of the top of the barrel body. The controller is used for controlling the servo motor to start, the output shaft of the servo motor drives the rotating shaft to rotate and synchronously drives the filtering barrel to rotate, and waste mineral oil flows out of the holes of the filtering barrel, enters the barrel body and is discharged through the oil outlet pipe under the action of centrifugal force through rotation of the filtering barrel, so that the waste mineral oil is discharged through the oil outlet pipe under the action of the centrifugal force. The filtering efficiency of the waste mineral oil can be improved.

A filter and method for removing solids from FCC oil slurries and concentrates thereof is provided. The filter comprises a main tank (4), a first filter cylinder, a second filter cylinder and a third filter cylinder, each of which is composed of a main conduit and a number of secondary conduits with porous outer walls surrounding the main conduit, each of which is fitted with a single turn of first filter membrane around its outer periphery, a filter cake scraper (7) installed inside the main tank above the third filter cylinder, and a deslagging bin (8) installed at the bottom of the main tank. The present invention can achieve complete solid-liquid separation of FCC oil slurry and its concentrate, and fully automatic, intelligent operation.

The utility model belongs to the technical field of waste oil treatment, and particularly relates to a waste oil treatment and recovery device which comprises a shell, a plug pin structure is installed at the front end of the shell, inclined panels are fixedly connected to the middle of the inner wall of the shell, and a filter plate is arranged on the inner wall of the shell and located between the inclined panels. A self-locking mechanism is installed in the top square inclined panel and the filter plate, and a sealing mechanism is installed on the inner wall of the front end of the filter plate. According to the utility model, through the mutual cooperation of the curved surface of the curved-surface cylinder and the curved-surface ring, the sliding rod and the inclined surface block structure, and under the action of the elastic force of the first spring, the filter plate can be conveniently and quickly mounted and unlocked, and the filter plate can be conveniently replaced; and through a bolt rod, a bolt column and a groove formed in the top end of the filter plate handle, the two ends of the filter plate are limited, so that the stress of the two ends of the filter plate is the same, and the filter plate is prevented from being bent.

A method for converting waste oil into oil products includes forwarding the waste oil to an oil treatment part of a waste oil converting system that includes one or more of the following subsystems: a decanter, a centrifuge, a chemical addition subsystem, a mixer, a filter, a settling tank, a water injection nozzle and / or a heater. Then measuring a property of the waste oil, such as density, viscosity, amount of water, amount of ash, amount of particles, and / or flash-point, using a sensor. Then adjusting one or more settings of the subsystem based on at least one measured value using a control system. Also treating the waste oil with the at least one subsystem to decrease a water content, a sludge content and / or a particle content of the waste oil, and using the control system to control an outlet flow of the treated waste oil. Also the waste oil converting system.

The utility model relates to a deslagging device for oil exploration, which comprises a deslagging box, a sealing box door is hinged to the front end of the deslagging box, a plurality of pairs of concave sliding grooves are symmetrically formed in the left side wall and the right side wall in the deslagging box, and a screening assembly is slidably connected in each pair of concave sliding grooves. A plurality of knocking assemblies acting on the screening assembly are installed on the side wall of the slag removal box, a screening barrel is rotationally connected to the lower end in the slag removal box, and a rotating power assembly detachably connected with the screening barrel is installed at the bottom end of the slag removal box. The petroleum crude oil residue removing device has the advantages that the screening assembly is matched with the knocking assembly, the rotary power assembly drives the screening barrel to rotate, filtering and residue removing are conducted on petroleum crude oil, and the residue removing efficiency is high; chippings and impurities are left in the feeding barrel and the screening barrel, leakage is avoided during treatment, and the working environment is prevented from being polluted; the screening assembly and the screening barrel are convenient to mount and dismount, and disintegrating slag is convenient to treat.

The embodiment of the invention provides a naphtha raw material filter, and relates to the technical field of petroleum refining. The naphtha raw material filter comprises a supporting frame, the top of the supporting frame is fixedly connected with two bottom covers, the tops of the bottom covers are fixedly connected with a primary filtering tank body, and the outer wall of the primary filtering tank body is fixedly connected with a pressure gauge. A rotating rod drives a belt to move through a belt pulley I, the belt drives a rotating shaft and a driving clamping gear to rotate, and the driving clamping gear drives a driven clamping gear and a primary filter screen to rotate, so that naphtha is in more uniform contact with the primary filter screen; and the L-shaped lifting rod ascends and descends in a reciprocating mode, the L-shaped lifting rod drives the collision ball to collide with the primary filter screen, and vibration generated by the primary filter screen facilitates falling of impurities blocked on filter holes of the primary filter screen.

The invention relates to a method for producing middle distillates and naphtha from a mixed feedstock comprising a heavy fraction of fossil hydrocarbons, of which at least 50% by weight of the compounds have an initial boiling point greater than 300°C and a final boiling point less than 700°C, and less than 50% by weight is a pyrolysis oil fraction of plastic and / or tyres and / or recovered solid fuels having a paraffinic and olefinic compound content greater than 60% by weight, the method comprising the following steps: a) a step of hydrotreating the mixed feedstock in order to obtain a hydrotreated effluent; b) a step of hydrocracking the hydrotreated effluent in order to obtain a hydrocracked effluent; c) a step of separating the hydrocracked effluent in order to produce at least one gaseous effluent comprising hydrogen and at least one liquid effluent; d) a fractionation step for producing a naphtha cut and a middle distillate cut.

The high-frequency double-layer vibrating screen for petroleum drilling comprises a box body, the top of the box body is fixedly connected with a feeding pipe in a communicating mode, the tops of the two sides of the box body are fixedly connected with vibrating motors, and two driving wheels and two driven wheels are rotationally installed between the inner walls of the front side and the rear side of the box body. By arranging a series of structures, drilling fluid can be subjected to two-stage vibration solid slag filtration, and solid slag conveying, outer side scraping cleaning of a conveying belt type filter screen, inner side back blowing cleaning dredging, blowing cleaning slag discharging and guiding and concentric-square-shaped filter screen dredging work can be conveniently and automatically achieved in a single-drive integrated mode during vibration filtration; according to the device, dredging cleaning and internal deslagging work do not need to be manually and separately conducted at regular time, the stable, automatic and long-acting screening requirement is met, integrated blowing and discharging and slope guiding and discharging are matched with an original vibration mode, solid residues can be effectively, stably, continuously and automatically discharged, the screening and deslagging stability is improved, and the mode that multiple functions are integrally achieved through single driving is utilized, so that the screening efficiency is improved. And a good energy-saving effect is achieved.

The utility model provides an oil product collecting system. The oil product collecting system comprises at least one separator used for containing oil products; the collector comprises an oil inlet and an oil outlet, and the oil inlet is connected with all the separators through collecting pipelines; the collecting valve is arranged on the collecting pipeline; when the collecting valve is in an open state, the collector is communicated with at least one separator; when the collecting valve is in a closed state, the collector is separated from all the separators; the liquid level monitoring device is arranged on the collector and is used for monitoring the liquid level of the oil product in the collector; the recovery device comprises a recovery pump, and the recovery pump is connected with the oil outlet of the collector and electrically connected with the liquid level monitoring device; and the recovery device is configured to be started when the liquid level monitoring device monitors that the liquid level of the oil product in the collector reaches a height threshold value. The liquid level of the oil product in the collector is automatically monitored in the oil product collection process, and the recovery device is started to extract the oil product in the collector when the liquid level reaches the set height threshold value, so that the automation degree of the oil product collection system is improved.

The invention relates to the technical field of oil-water separation, in particular to a waste oil continuous flocculation sedimentation deslagging device which comprises a tank body, the tank body comprises a sedimentation area and a deslagging area, a sedimentation assembly is arranged in the sedimentation area, a quick release structure is arranged between the tank body and the sedimentation assembly, the sedimentation assembly comprises a plurality of inclined plate pieces, and the quick release structure comprises a fixing piece. According to the invention, the ceramic micro-filtration membrane is embedded on the inclined plate, and oil sludge, colloid and asphalt are quickly pulled down and adsorbed on the surface of the inclined plate by adopting a micro-negative pressure technology, so that the oil sludge, colloid and asphalt can be quickly separated from the inclined plate, and the oil sludge, colloid and asphalt can be quickly separated from the inclined plate; when a certain thickness is formed on the surface, the oil sludge slides down to the slag area along with the inclined plate, and the settlement assembly is locked through the matching of the fixing piece and the inserting piece, so that complicated procedures such as screws and bolts are not needed, and the installation is faster and more convenient.

Embodiments of the present disclosure relate to a method for producing refined hydrocarbons from waste plastics, the method including: a pretreatment process of pretreating waste plastics; a pyrolysis process of producing pyrolysis gas by introducing the waste plastics pretreated in the pretreatment process into a pyrolysis reactor; a lightening process of producing pyrolysis oil by introducing the pyrolysis gas into a hot filter; and a distillation process of distilling the pyrolysis oil to obtain refined hydrocarbons, wherein a liquid condensed in the hot filter is re-introduced into the pyrolysis reactor, and a system for producing refined hydrocarbons from waste plastics.

The invention discloses filter material buffer equipment and a buffer method for a ZS filter. The equipment comprises an outer shell, a rough filtration assembly, a fine filtration assembly and a discharge pump, the rough filtration assembly comprises a filter screen disc arranged in the outer shell, a hollow pipe clamped in the outer shell and a material stirring rake arranged on the hollow pipe, and a driving motor is arranged at the top end of the outer shell; the fine filtering assembly comprises a positioning ring plate arranged in the outer shell, a fine filtering net clamped to the positioning ring plate, an extrusion plate and a driving ring, a moving rod is clamped to the positioning ring plate, and an electric push rod hinged to the outer shell is hinged to the driving ring; the equipment disclosed by the invention is reasonable in structural design, and the catalytic cracking oil slurry entering the ZS filter is more uniform in texture by performing coarse filtration, fine filtration and stirring homogenization treatment on the catalytic cracking oil slurry, so that the pulsation phenomenon caused by medium pressure when the catalytic cracking oil slurry enters the ZS filter is avoided, and the quality of the catalytic cracking oil slurry is improved. The running stability and reliability of the ZS filter are improved, and the ZS filter is suitable for popularization and application.

The utility model relates to the technical field of waste mineral oil processing, in particular to a filtering tank for regeneration treatment of waste mineral oil, which comprises a processing table, a processing component and a filtering component are respectively arranged at the top of the processing table, and the filtering component is positioned on the side surface of the processing component. According to the waste mineral oil processing device, waste mineral oil in a processing barrel is heated through a steam inlet pipe, then hot steam is led into an annular heating pipe, then the annular heating pipe heats the waste mineral oil in the processing barrel, then the steam is discharged from a steam outlet pipe, and the processing barrel can be continuously heated through circulation, so that the waste mineral oil can be conveniently stirred by a stirring frame, and the processing efficiency and the processing quality are improved; the oil well pump is started to pump waste mineral oil in the processing barrel into the filter barrel through the oil pumping pipe, the working efficiency is improved, the first filter screen and the second filter screen are arranged in the filter barrel, the mesh size of the first filter screen is smaller than that of the second filter screen, and then the quality of the filtered waste mineral oil is improved.

The invention discloses a fine filter for refining fuel oil, and relates to the technical field of filtration. The fine filter for refined fuel oil comprises a shell assembly, the shell assembly comprises an outer cylinder, an upper cover plate and a first lower sealing plate, the upper cover plate is fixedly connected to the top end of the outer cylinder, and the first lower sealing plate is fixedly connected to the bottom end of the outer cylinder; the inner cylinder is rotationally installed at the axis position in the shell assembly, and the axis of the inner cylinder is parallel to the axis of the outer cylinder; and the annular filter screen is vertically installed in the shell assembly, and the annular filter screen is located between the inner cylinder and the outer cylinder. The dirt scraping mechanisms are arranged at the filter screen and the filter element respectively, the dirt discharging mechanism is arranged at the bottom end of the inner cylinder, accumulated dirt generated during filtering of the device is transferred into the conical containing cavity and discharged through the dirt discharging mechanism, dirt discharging work can be carried out during filtering work, shutdown treatment is not needed during dirt discharging, and the device is convenient to use. And the replacement period and the service life of the filter element and the filter screen are prolonged.

The present invention relates to a process and system for forming a hydrocarbon feedstock from a biomass material, and the hydrocarbon feedstock formed therefrom. The present invention also relates to a process and system for forming a bio-derived naphtha fuel from a hydrocarbon feedstock, and the bio-derived naphtha fuel formed therefrom, as well as intermediate treated hydrocarbon feedstocks formed during the process.

A method for treating mixed plastic waste, the method comprising: (I) pyrolyzing the mixed plastic waste in a pyrolysis reactor at a temperature of 250 DEG C to 700 DEG C and a pressure of 1.0 bar to 100 bar to form a pyrolysis oil; (II) optionally transferring the pyrolysis oil directly to a hydrotreating unit via a filter, and subjecting the pyrolysis oil to hydrotreating with a catalyst in the presence of hydrogen at a temperature of 250 DEG C to 700 DEG C and a pressure of 1.0 bar to 100 bar to form a hydrotreated pyrolysis oil; (III) regenerating a portion of the hydrotreated pyrolysis oil directly from the hydrotreating unit to the pyrolysis reactor.

The invention relates to the technical field of gas anchors, in particular to a variable pitch type spiral gas anchor. Comprising an anchor body, a sand prevention cylinder is installed on the lower side of the anchor body, a sand prevention hole is formed in the sand prevention cylinder, a spiral piece is fixedly connected into the anchor body, a center pipe fixedly connected with the anchor body is fixedly connected to the middle of the spiral piece, and the anchor body, the spiral piece and the center pipe are matched to form a spiral channel. A separation cavity is formed in the upper side of the spiral piece in the anchor body, the screw pitch of the lower side of the spiral piece is smaller than that of the upper side of the spiral piece, the screw pitch of the upper side of the spiral piece is gradually increased from bottom to top, and exhaust holes which are distributed in a spiral shape and located in the inner side of the spiral piece are formed in the center pipe. Petroleum pushes gas to the middle by setting the screw pitch of the spiral piece, the gas in the spiral channel is exhausted in advance in cooperation with the exhaust hole, the amount of the gas accumulated in the separation cavity is reduced, and it is guaranteed that the oil pumping process is conducted smoothly.

The invention provides a high-pressure crude oil filtering separator with a pressure self-adaptive adjustment function, and relates to the technical field of filtering and separating devices.The high-pressure crude oil filtering separator comprises a flow dividing pipe, filtering boxes are arranged at the bottoms of the two ends of the flow dividing pipe, connecting pipes are fixed to the tops of the filtering boxes, and propellers are rotationally installed in the connecting pipes through spokes; a flow dividing pipe is arranged at the bottom of the filter box, an oil inlet pipe is fixed to the top of the middle of the flow dividing pipe, an oil discharging pipe is arranged on one side of the bottom of the filter box, a separator is arranged at the rear end of the filter box, and a conveying pipe is fixed to the top of the oil discharging pipe. Crude oil is filtered and separated through the leakage frame and the conical filtering plate in the filtering box, comparison is conducted according to the crude oil output efficiency of the bottom of the filtering box, the situation that crude oil is insufficient or a filtering structure is blocked is distinguished, the filtering structure is cleaned or the rotating speed of a propeller is increased according to needs, and the passing rate of the crude oil is increased by improving pressure.

The present invention relates to a process for treating a feedstock comprising plastics and / or tyres and / or solid recycled fuel pyrolysis oils containing halogenated compounds, said process comprising: a) a hydrotreating step to obtain a partially hydrotreated effluent having a reduced halogenated compound content, b) a separation step to obtain a partially hydrotreated effluent having a reduced halogenated compound content, and c) a separation step to obtain a partially hydrotreated effluent having a reduced halogenated compound content. The present invention relates to a process for the steam cracking of a petroleum feedstock fed with a partially hydrotreated effluent from step a) and an aqueous solution to obtain a gaseous effluent, an aqueous effluent and a partially hydrotreated hydrocarbon effluent, c) a steam cracking step of a petroleum feedstock wherein at least a portion of the partially hydrotreated hydrocarbon effluent is introduced as a common feedstock, the mixture of the petroleum feedstock and the partially hydrotreated hydrocarbon effluent from step b) has a halogenated compound content of less than or equal to 3 ppm by weight without first undergoing a further hydrotreating step carried out at a higher temperature and / or pressure.

The utility model discloses a waste mineral oil impurity removal device and relates to the technical field of impurity removal devices. Comprising a box body, filtering frames are slidably connected to the inner walls of the two ends of the box body, limiting plates are fixed to the two sides of the top end of each filtering frame, sliding grooves are formed in the sides, close to each other, of the two limiting plates, and a cleaning mechanism is arranged on the inner walls of the two ends of the box body in a penetrating mode and comprises two fixing plates fixed to the inner wall of one side of the box body; a lead screw is rotationally connected between the two fixing plates. Compared with the prior art, the cleaning device has the advantages that the lead screw rotates, so that the sliding block moves, the mounting rod is driven to move, the mounting rod moves to drive the cleaning plate to move front and back, and the surface of the filtering frame is cleaned; the cleaning plate is located between the two limiting plates all the time, and when the filtering frame moves, the cleaning plate moves left and right on the mounting rod, and impurities on the surface of the filtering frame are cleaned away from the filtering frame.