48results about "Petroleum wax refining" patented technology

A method of removing paraffinic wax from pyrolysis oil that includes flowing pyrolysis oil into a tank and reducing the temperature of the pyrolysis oil to a temperature that causes the paraffinic wax that is in solution in the pyrolysis oil to precipitate and form (1) paraffinic wax in solid form and (2) remaining pyrolysis oil in liquid form. The method further includes pumping the remaining pyrolysis oil from the tank to a first location. The method then involves heating the paraffinic wax in solid form to form paraffinic wax in liquid form and pumping the paraffinic wax in liquid form to a second location. In this way, the paraffinic wax and the remaining pyrolysis oil can be processed separately according to their respective properties.

The utility model relates to the technical field of copper rod production, in particular to a novel wax liquid filtering device which comprises a filtering cylinder, a cylinder cover arranged above the filtering cylinder and a base support arranged below the filtering cylinder. The adjusting device comprises a threaded rod in threaded connection with the filter plate, a limiting block arranged at the bottom end of the threaded rod, a sliding rod arranged at the upper end of the threaded rod, a spline rod arranged at the upper end of the sliding rod and a motor arranged on the cylinder cover and connected with the top and bottom of the spline rod; a cleaning rod is arranged at the upper end of the spline rod, a spring connected with the spline rod in a sleeving mode is arranged between the cleaning rod and the cylinder cover, two layers of filter screen media are arranged and are the dot non-woven fabric and the polyester fiber cloth, so that wax liquid can be better filtered, automatic filtering of backflow wax liquid is achieved through the liquid inlet pipe and the liquid outlet pipe, impurities in the wax liquid are reduced, and the service life of the wax liquid is prolonged. The wax liquid can be recycled; and the adjusting device is arranged to adjust the position of the filter plate so as to clean impurities.

The invention discloses a Y-type molecular sieve and a preparation method thereof, a catalyst and a preparation method thereof, and a Fischer-Tropsch wax hydrocracking method, and belongs to the technical field of chemical engineering. The method comprises the following steps: S1, mixing a first alkali source, a first aluminum source, a first silicon source, first water and a template agent to obtain a first mixed solution, and pre-crystallizing to obtain a seed crystal guiding agent; the pre-crystallization temperature is 15-35 DEG C, the pre-crystallization time is 24-60 hours, and the template agent is poly (diallyldimethylammonium chloride); s2, mixing a second alkali source, a second aluminum source, a second silicon source and second water to obtain mother liquor; mixing the guiding agent and the mother liquor to obtain initial gel; crystallizing the initial gel to obtain an alkali metal Y-type molecular sieve; and S3, mixing the alkali metal Y-type molecular sieve with an ammonium-containing solution, carrying out ammonium ion exchange treatment to obtain a first Y-type molecular sieve, and carrying out first roasting treatment to obtain a second Y-type molecular sieve. The particle size of the molecular sieve is smaller than 520 nm, and the silica-alumina ratio is larger than 6.5.

The invention provides a continuous production system and a continuous production method of artificial beeswax. The continuous production system comprises at least one continuous Fischer-Tropsch wax melting device, a continuous oxidation reaction device and a continuous esterification reaction unit, and each continuous Fischer-Tropsch wax melting device is provided with a Fischer-Tropsch wax raw material inlet, a liquid wax outlet and a heating part; the continuous oxidation reaction device is provided with a liquid wax inlet, an oxidation gas inlet and an oxidation reaction product outlet, and the liquid wax inlet is communicated with the liquid wax outlet; the continuous esterification reaction unit comprises a continuous esterification reaction device, the continuous esterification reaction device is provided with a first oxidation reaction product inlet, a first catalyst inlet and an artificial beeswax outlet, and the first oxidation reaction product inlet is communicated with the oxidation reaction product outlet. According to the continuous production system for the artificial beeswax, the Fischer-Tropsch wax is used as a starting raw material, and the artificial beeswax produced by adopting the continuous production system for the artificial beeswax is high in ester-acid ratio, capable of simultaneously meeting the requirements of an acid value and a saponification value, high in production efficiency and low in cost.

The utility model relates to the technical field of candle manufacturing equipment, and discloses a temperature control device for manufacturing refined wax, which comprises a box body, a feed port and a discharge port are connected on the box body, a coil pipe is arranged in the box body, and the coil pipe is rotatably connected with the side wall of the box body through a coil pipe branch pipe; a heating water tank is arranged on the edge of the box body, a heater is arranged in the heating water tank, the heating water tank is connected with a first circulating pipe and a second circulating pipe, the first circulating pipe and the second circulating pipe are rotationally connected with the coil pipe branch pipes respectively, the coil pipe branch pipe at the left end is connected with a driving assembly, and a temperature sensor is arranged in the box body; the driving assembly comprises a motor, the output end of the motor is connected with a first gear, the coil pipe branch pipe at the left end is sleeved with a second gear, and the second gear is meshed with the first gear. Raw materials in the box body are fully heated and are overturned and stirred at the same time, so that the internal heating is more uniform, and the effect is better.

The invention discloses a wax recovery treatment method which comprises the following steps: stirring, dissolving and precipitating wax in a sodium hydroxide solution to obtain supernate; adding the supernatant into boric acid, stirring to obtain jelly, filtering the jelly, washing, and drying to obtain a dried substance; mixing and stirring the dried substance and methanol, and drying to obtain a wax solid substance; and purifying the wax solid with a distillation extract of petroleum ether. According to the method, impurities in the wax are effectively removed, and the recovery purity and quality of the wax are improved, so that the service life of the wax is prolonged, the production cost is reduced, and the aims of saving resources and protecting the environment are fulfilled.

The invention relates to the technical field of chemical production equipment, in particular to a refining device for chlorinated paraffin. The invention provides a refining device for chlorinated paraffin. The refining device comprises a supporting frame body, a degassing tank is fixedly mounted in the supporting frame body, a feeding pipe and an exhaust pipe are arranged at the top of the degassing tank, a discharging pipe is arranged at the bottom of the degassing tank, a motor is mounted on the supporting frame body, and an output shaft of the motor is connected with a stirring paddle extending into the degassing tank; a gas inlet cavity is formed in the lower part of the stirring paddle, the bottom of the degassing tank is fixedly connected with an annular box, and the stirring paddle penetrates through the annular box. The Venturi tube type compressed air bag is used for pressurizing inert gas, so that the inert gas overcomes the resistance of viscous liquid and forms fine bubbles, and the air-liquid contact area is increased; the stirring paddle is matched to drive the gas bag to rotate, so that bubbles are uniformly distributed, the retention time is prolonged, and the removal efficiency of impurities such as hydrogen chloride and chlorine is greatly improved; and the intermittent exhaust device can also avoid waste of gas which is not fully utilized due to continuous exhaust.

The utility model relates to the technical field of paraffin separation, in particular to a separation device for producing light liquid paraffin, which comprises a separation barrel, a conical barrel is fixedly connected to the bottom of the separation barrel, a crushing assembly for crushing wax crystals is arranged in the separation barrel, and the crushing assembly comprises a rotating shaft rotationally connected to the interior of the separation barrel. According to the wax crystal crushing device disclosed by the utility model, wax crystals continuously impact the crushing barrel through the arranged crushing assembly, so that large wax crystals are further promoted to be crushed into a plurality of small wax crystals, liquid wax attached to the wax crystals is promoted to fully overflow through the manner, and the wax crystals can be crushed into small wax crystals; meanwhile, later-stage wax crystal output is facilitated, the blockage condition is avoided, meanwhile, accurate temperature control is not needed by adopting a natural cooling mode, and the complexity in the production process is reduced.

The utility model relates to the technical field of chlorinated paraffin production, in particular to a single-carbon-chain chlorinated paraffin production device. The device comprises a mounting assembly, the mounting assembly comprises a pair of fixing plates which are arranged at intervals from top to bottom, a preparation tank and a cleaning tank are formed in the fixing plate located on the upper portion, a preparation assembly is arranged in the preparation tank and used for driving paraffin to fully react with chlorine, and a cleaning assembly is arranged in the cleaning tank; according to the single-carbon-chain chlorinated paraffin production device, the preparation assembly is used for driving paraffin to fully react with chlorine, the extraction assembly is used for extracting an obtained chlorinated paraffin crude product into the cleaning assembly, then byproducts in the crude product are washed away through the cleaning assembly, and the discharging assembly and the cleaning assembly are matched with each other, so that the single-carbon-chain chlorinated paraffin is produced. After the chlorinated paraffin crude product is cleaned, the chlorinated paraffin crude product can be automatically separated from water in which hydrochloric acid is dissolved.

Provided is a continuous process for converting waste plastics for recycling for polyethylene polymerization or for linear alpha olefins. The process includes selecting waste plastics containing polyethylene and / or polypropylene and then passing the waste plastics through a pyrolysis reactor to thermally decompose at least a portion of the polyolefin waste and produce a pyrolysis effluent. The pyrolysis effluent is separated into off-gas, a naphtha / diesel fraction, a heavy fraction, and char. The naphtha / diesel fraction is passed to a crude refinery unit, from which a straight-run naphtha (C5-C8) fraction or a propane / butane (C3-C4) fraction is recovered. The straight-run naphtha fraction or the propane and butane (C3-C4) fraction is passed to a steam cracker for ethylene production. The ethylene is converted to linear alpha olefins and / or polyethylene. The heavy fraction from the pyrolysis reactor can also be combined with the heavy fraction of the linear alpha olefin stream recovered from the steam cracker. The combined heavy fraction and the heavy fraction of the normal alpha olefin stream may be passed through a wax hydrogenation zone to produce wax.

The utility model relates to the technical field of chlorinated paraffin production, and provides a chlorinated paraffin refining device which is characterized in that a kettle body is arranged on a bracket; the sliding frame is slidably arranged on the support. The sliding frame is hinged to the telescopic legs. According to the technical scheme, the problems that in the prior art, precipitation of impurities in chlorinated paraffin in hydrochloric acid is slow, and the production time is too long are solved.

The utility model relates to the field of cleaning devices, in particular to a device for cleaning light liquid paraffin, during operation, water and oil in a tank body of a liquid preparation tank are layered, the light liquid paraffin is located on the upper layer, water-phase liquid is located on the lower layer, and the water-phase liquid on the lower layer of the liquid preparation tank continuously flows out of a liquid outlet under the action of a peristaltic pump. The liquid in the tank is kept in a rotating state by virtue of a plurality of electric stirring paddles, the water-phase liquid can be fully contacted with the light liquid paraffin layer when flowing through the light liquid paraffin layer and then sinks into the lower layer by virtue of the rotation, and the oil phase and the water phase are completely layered after the water-phase liquid is fully circulated and is subjected to standing; water-phase liquid is discharged and discarded through the discharging pipe, then cleaned light liquid paraffin is sent out and collected, in the circulation process, compound impurities in materials can be effectively screened out through the filter screen cover arranged at the bottom of the limiting barrel, and the cleaning effect on the materials is effectively improved.

A method of removing paraffin wax from a pyrolysis oil includes flowing the pyrolysis oil into a tank and reducing the temperature of the pyrolysis oil to a temperature that precipitates paraffin wax dissolved in the pyrolysis oil and forms (1) the paraffin wax in solid form and (2) the remaining pyrolysis oil in liquid form. The method further includes pumping the remaining pyrolysis oil from the tank to a first location. The method then includes heating the paraffin wax in solid form to form a paraffin wax in liquid form, and pumping the paraffin wax in liquid form to a second location. In this manner, the paraffin wax and the residual pyrolysis oil can be treated separately according to their respective properties.

The present disclosure generally relates to methods for deoiling a hydrocarbon feed and to products formed therefrom. In an embodiment is provided a method of deoiling a feed that includes introducing a waxy feed and a deoiling solvent to a dilution chilling zone; mixing the waxy feed and the deoiling solvent in the dilution chilling zone at a temperature of from about 10° F. to about 30° F. to form a slurry; introducing the slurry to a filter zone, the filter zone comprising one or more filter stages, wherein a temperature of the slurry is from about 40° F. to about 75° F.; separating the wax from the oil and the deoiling solvent to form a wax cake in a first filter stage; and washing the wax cake in the first filter stage with the deoiling solvent to obtain a composition comprising a wax. In another embodiment is provided a composition comprising a wax.

The invention belongs to the technical field of investment casting wax recovery, and relates to a purification treatment method and device for investment casting recovered wax, and the method comprises the following steps: adding clean tap water and a wax block needing to be treated and recovered into a container, heating the container and preserving heat, melting the wax block into wax liquid, and rolling and mixing the wax liquid with boiling water on a wax-water interface; the sundries precipitate and fall into the water bottom; the heating temperature is adjusted, heat preservation and standing are conducted, the wax liquid is separated from water, the wax liquid floats on the water surface, and residual impurities in the wax liquid are further precipitated; and taking out the wax liquid at the upper layer in the container to obtain the purified recycled wax. The device comprises a digital temperature controller and a barrel body composed of an inner barrel, an outer barrel and an oil storage barrel, an electric heating element is arranged in the oil storage barrel, wax liquid and water can be well arranged, impurities sink to the water bottom, at the moment, wax above the water liquid level can be completely discharged, and the impurities cannot be mixed in by mistake; the wax liquid treatment temperature and the technological process are stable and are not influenced by the number of impurities, and the method has the advantage of high operability.

The present invention provides a microcrystalline wax having a penetration greater than 1 at 25°C according to ASTM D-1321, a crystallinity of 5-70% according to XRD, an initial boiling point less than 500°C, a freezing point in the range of 60-120°C, and an oil content greater than 2 wt% according to ASTM D-721, wherein the microcrystalline wax has a maximum C40 fraction with at least 5 wt% multi-methyl-branched paraffins as determined by GCxGC.

The utility model belongs to the technical field of waste wax recovery, and particularly relates to a waste wax recovery device capable of filtering, which comprises a recoverer, a funnel is arranged at the top of the recoverer, a crushing component is arranged in the recoverer, a conical groove is arranged in the recoverer, and a discharge groove is fixedly connected to the bottom of the conical groove. And a heating block is arranged on the discharging groove, a melting box is arranged in the recoverer, and a square groove is fixedly connected to the melting box. According to the waste wax recovery device capable of filtering, impurities in recovered wax liquid can be conveniently removed through the installed filter plate and the installed square groove, the wax liquid flows through the filter plate, the filter plate can filter the impurities carried by the wax liquid, the square frame can be driven to move by pulling the square block, and then the impurities are removed through the square groove. The square frame is conveniently moved to drive the filter plate to move to the outside, so that the impurities filtered by the filter plate can be removed, and the purposes of filtering and collecting the wax liquid impurities and improving the wax liquid quality are achieved.

The utility model relates to the technical field of separation devices, and discloses an oleic acid separation device which comprises a separation barrel, an observation window is fixedly connected to the front face of the separation barrel, a heating cavity is formed in the separation barrel, the interior of the device can be observed through the observation window, and the separation effect and the miscellaneous matter cleaning condition can be observed conveniently. And a heating cavity is arranged to heat the device. The device has the following advantages and effects that through the arrangement of the separation barrel, the stirrer and the hydraulic lifting column, a worker puts raw materials into the separation barrel, the heating cavity in the separation barrel can heat the raw materials, the stirrer stirs the raw materials, the scraping plate scrapes and brushes the interior of the separation barrel at the same time, and at the moment, oleic acid becomes gas; and when too much impurities are adhered to the stirrer, the hydraulic lifting column is started to lift the barrel cover to clean the impurities on the stirrer and the scraping plate, so that the effects of being convenient to disassemble, assemble and clean are achieved.

The invention provides a microcrystalline wax hydrofining catalyst, a preparation method thereof and a method for preparing microcrystalline wax by using the microcrystalline wax hydrofining catalyst, and relates to the field of catalysts. The preparation method comprises the following steps: dropwise adding aluminum sulfate into water at 60-70 DEG C, controlling the pH value of a system to be 6-7, then dropwise adding water glass and ammonia water, and controlling the pH value of the system to be 8-8.5; circularly dropwise adding aluminum sulfate, water glass and ammonia water, reacting at 75-78 DEG C, then carrying out constant-temperature aging treatment, carrying out solid-liquid separation, and washing the solid to obtain modified silicon-aluminum powder; mixing the modified silicon-aluminum powder, organic acid, inorganic acid, an extrusion aid and water, molding, drying and roasting to obtain a catalyst carrier; tungsten salt, cobalt salt, nickel salt, phosphoric acid and water are mixed to prepare steeping liquor, the catalyst carrier is added into the steeping liquor to be steeped, and drying and roasting are conducted to obtain the microcrystalline wax hydrofining catalyst. The catalyst provided by the invention is suitable for inferior microcrystalline wax raw materials with high impurity content, and the obtained microcrystalline wax is good in quality.

A method for removing paraffin wax from pyrolysis oil includes flowing the pyrolysis oil into a tank and reducing the temperature of the pyrolysis oil to a temperature that causes the paraffin wax in solution in the pyrolysis oil to precipitate, forming (1) the paraffin wax in solid form and (2) residual pyrolysis oil in liquid form. The method further includes pumping the residual pyrolysis oil from the tank to a first location. Next, the method includes heating the solid paraffin wax to form the liquid paraffin wax and pumping the liquid paraffin wax to a second location. In this way, the paraffin wax and the residual pyrolysis oil can be treated separately according to their respective properties.

The invention provides a process for preparing a hydrowax comprising the steps of: (a) providing a hydrocarbonaceous feedstock which contains more than 4% by weight of hydrocarbons boiling in the range of from 550 to 800 °C; (b) hydrotreating the hydrocarbonaceous feedstock with a hydrotreating catalyst in the presence of a hydrogen- containing gas under hydrotreating conditions to obtain a hydrotreated product; (c) hydrocracking at least part of the hydrotreated product as obtained in step (b) with a hydrocracking catalyst in the presence of a hydrogen-containing gas under hydrocracking conditions to obtain a hydrocracked product, which hydrocracking catalyst contains a zeolitic component which is present in an amount of at least 14 wt%, based on the total weight of the hydrocracking catalyst, and wherein the volume ratio of the hydrotreating catalyst as used in step (b) and the hydrocracking catalyst is more than 1; and (d) recovering from the hydrocracked product as obtained in step (c) the hydrowax.

The present invention relates to the field of Fischer-Tropsch synthesis heavy wax processing, and discloses a system and method for separating Fischer-Tropsch synthesis heavy wax and catalyst. The system comprises: a heavy wax raw material tank, a high gradient magnetic separation device, a heavy wax product tank, a concentrated liquid tank, a second separation device, a flushing liquid tank, a waste catalyst receiving tank and a flushing pipeline; wherein the high gradient magnetic separation device is used to perform a first separation on the heavy wax, and the obtained qualified wax is stored in the heavy wax product tank; the flushing pipeline is used to flush the catalyst adsorbed in the high gradient magnetic separation device, and the obtained concentrated liquid containing the waste catalyst is sent to the concentrated liquid tank; the second separation device is used to perform a second separation on the concentrated liquid, and the obtained clear liquid with the catalyst separated enters the flushing liquid tank as a flushing liquid raw material, and the obtained waste catalyst enters the waste catalyst receiving tank. The separation efficiency of heavy wax and catalyst can be improved, and the flushing effect of the high gradient magnetic separation device can be improved at the same time.

The invention provides a Fischer-Tropsch wax filter which comprises a rotating device, a machine body, a main shaft, a filter part and a feeding inner part, a feeding pipe is arranged at the bottom of the machine body, the main shaft is located in the machine body, a discharging pipe extending out of the machine body is arranged at the bottom of the main shaft, the filter part is arranged on the periphery of the main shaft, the feeding inner part is located in the machine body, and the feeding inner part covers a port of the feeding pipe. The rotating device is used for driving the spindle to rotate. According to the Fischer-Tropsch wax filter disclosed by the invention, a Fischer-Tropsch wax filtering process is realized, and clear filtrate is obtained; after filtering, filter residues on the filtering piece can be thrown out, and the filtering effect is kept; according to the Fischer-Tropsch wax filter disclosed by the utility model, the feeding inner part has a shunting effect on the to-be-filtered liquid in the feeding pipe, so that the to-be-filtered liquid is more uniformly distributed in the machine body, the blockage caused by accumulation of a catalyst and a solid in wax liquid is prevented, the large-scale Fischer-Tropsch wax filtering treatment is met, the filtering precision and the filtering capacity are relatively high, the maintenance frequency is reduced, and the cost of spare part loss is further reduced.

The utility model relates to the technical field of light liquid paraffin rectification separation, in particular to a light liquid paraffin rectification separation mechanism which comprises a supporting frame, a rectification tank is fixedly connected in the supporting frame, the top of the rectification tank is communicated with an air outlet pipe, and the side wall of the rectification tank is fixedly connected with a condenser through a fixing plate. One end of the air outlet pipe is fixedly connected to the input end of the condenser, the output end of the condenser is fixedly connected with a liquid return pipe, the outer wall of the liquid return pipe is communicated with a discharging pipe, the side wall of the rectification tank is communicated with a material conveying pipe, and the bottom of the rectification tank is communicated with a discharging pipe. And a gas-liquid contact mechanism for fully increasing the contact area of gas and liquid is arranged in the rectification tank. Compared with the prior art, the problems of low separation efficiency, low purity and the like caused by insufficient contact area and time in the prior art are solved, a high-efficiency and stable separation process is realized, and the requirements on high-purity light liquid paraffin are met.

The utility model relates to the technical field of wax-water separation equipment, in particular to a micro-negative-pressure steam heating wax-water separator which comprises a separator shell, a steam generator is arranged on one side of the separator shell, the steam generator is provided with a water tank, the separator shell is provided with a deslagging drain pipe, and the deslagging drain pipe is provided with a water inlet pipe and a water outlet pipe. A deslagging and drainage pipe is arranged in the separator shell, the deslagging and drainage pipe is communicated with the separator shell, a deslagging and drainage valve is arranged on the deslagging and drainage pipe, the separator shell is provided with a wax temperature probe, the wax temperature probe is used for measuring the temperature of wax liquid in the separator shell, the separator shell is provided with a wax outlet pipe, and the wax outlet pipe is communicated with the separator shell. A pump inlet heat preservation valve is arranged on the wax outlet pipe, the wax outlet pipe is provided with an electric gear pump, a steam discharging pipe is arranged in the separator shell, liquid in the separator shell is evenly stirred through the stirring rod, the separation efficiency is improved, the steam discharging pipe uses high-temperature steam as a heat source, and wax liquid heating is safer and more reliable.

The present invention relates to a method for refining high melting point crude paraffin wax, which adopts a method of adsorption refining and hydrogenation refining in series. The conditions of the adsorption refining are: temperature 50-200°C, volume space velocity 0.1-2.0h ‑1 The conditions of the hydrotreating are: reaction temperature 150-320°C, reaction pressure 2-15MPa, volume space velocity 0.2-2.0h ‑1 , the volume ratio of hydrogen wax is 100-600:1, the adsorbent is formed clay with humic acid added, and the bulk density is 0.5-0.85g / cm 3 . The traditional clay refining device uses powdered clay. After the clay and paraffin or microcrystalline wax are fully stirred and adsorbed in a kettle reactor, they are filtered and separated to remove the waste clay. The equipment used is large, the process is complicated, and the waste clay output is large. The clay adsorption refining process of the present invention uses molded clay, which is continuously adsorbed and refined in a fixed bed reactor. The process is simple and the equipment used is small.

The utility model discloses a Fischer-Tropsch wax purification device, which relates to the technical field of Fischer-Tropsch wax production, and comprises a mixing box, a connecting pipe is arranged at the lower end of the mixing box, a filter box is arranged at the lower end of the connecting pipe, the filter box is supported by a support rod, and an adding pipe I and an adding pipe II are respectively arranged at the upper end of the mixing box. A pneumatic stirring assembly is installed in the mixing box, a control valve is installed on the surface of a connecting pipe, a filter frame is slidably installed in the filter box below the connecting pipe, a filter screen is installed at the bottom end of the filter frame, an exhaust pipe is installed at one end of the filter box below the filter screen, an exhaust fan is installed at one end of the exhaust pipe, and an air inlet is formed in the other end of the filter box. According to the utility model, the pneumatic stirring component is arranged, a pneumatic device in the pneumatic stirring component exhausts gas into the gas dispersing disc through the breather pipe and exhausts the gas from the branch pipe on the gas dispersing disc, and bubbles rise from the bottom of a mixture of a solvent and wax hydrocarbon, so that the stirring of the solvent and the wax hydrocarbon is realized, and the sufficient mixing of the solvent and the wax hydrocarbon is facilitated.

The present invention discloses a method for hydrofining of paraffin. The method comprises the following steps: mixing hydrogen with paraffin raw materials, first passing through a microinterface generator, breaking the hydrogen into microbubbles with a diameter of 1 μm to 1 mm, and then entering a reactor to contact with a catalyst for a hydrofining reaction; wherein the reactor comprises three catalyst beds, along the flow direction of the reactants, the first bed is filled with a protective agent, the second bed is filled with a type I paraffin hydrofining catalyst, and the third bed is filled with a type II paraffin hydrofining catalyst; wherein the filling volumes of the protective agent, the type I paraffin hydrofining catalyst, and the type II paraffin hydrofining catalyst account for 2% to 10%, 20% to 40%, and 50% to 78% of the total volume of the reactor, respectively. The method of the present invention solves the problem that the life of the paraffin hydrofining catalyst is shortened due to the deposition of carbon deposits, prolongs the life of the paraffin hydrofining catalyst, and improves the operation cycle of the paraffin hydrogenation device.

This utility model discloses a dewaxing device for lubricating oil base oil, including a preheating tank, a primary cooling tank and a secondary cooling tank sequentially arranged at the rear end of the preheating tank, and a filter box arranged at the rear end of the secondary cooling tank; the upper end of the preheating tank is provided with an oil inlet and an additive inlet, and a heat exchange tube for heating the preheating tank is arranged around its outer wall; the primary and secondary cooling tanks are respectively provided with oil delivery pipes for conveying base oil, and a first coolant tank and a second coolant tank are respectively connected to the primary and secondary cooling tanks for cooling the base oil in the oil delivery pipes; the filter box is provided with a vibrating screen and a filter plate for filtering the cooled base oil, a vibrating motor is provided at the bottom of the vibrating screen, and an oil outlet pipe is provided at the bottom of the filter box; the device also includes a PLC controller. This utility model improves the dewaxing effect and realizes wax recovery.