Horizontal light component removal conveying device, light component removal conveying method, dichlorobenzene rectification residual liquid recovery device and recovery method

Abstract

The invention provides a horizontal light component removal conveying device, a light component removal conveying method, a dichlorobenzene rectification residual liquid recovery device and a dichlorobenzene rectification residual liquid recovery method. The horizontal light component removal conveying device comprises a body, a stirring device and a transmission device, the stirring device is arranged in the body, and the stirring device is connected with the transmission device so as to drive the stirring device to rotate; the stirring device comprises a stirring shaft and stirring blades arranged on the stirring shaft, and the stirring shaft is horizontally arranged; the stirring shaft and the stirring blades are of hollow structures which are communicated with each other; the stirring shaft comprises at least one sub-stirring shaft pair which is arranged in parallel, and two sub-stirring shafts are arranged in the sub-stirring shaft pair; and the stirring blades on the two sub stirring shafts in the sub stirring shaft pair are arranged in a staggered manner. According to the invention, heating, light component removal and conveying of high-viscosity materials such as dichlorobenzene rectification residual liquid can be realized, and the problem that high-viscosity solid wastes are difficult to treat at present is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of material recovery and separation, and in particular to a horizontal light-removal conveying device, a light-removal conveying method, a dichlorobenzene distillation residual liquid recovery device and a recovery method. Background Art

[0002] Dichlorobenzene is a basic chemical raw material and is widely used in the fields of solvents, medicines, pesticides, dyes, organic synthesis, polymer materials, etc. Dichlorobenzene is mainly prepared by directional chlorination of benzene. After the chlorination reaction liquid is distilled to produce high-purity target product dichlorobenzene, a large amount of distillation residue will be produced. The residue contains a large amount of polychlorinated benzene compounds (three or more chlorine atoms on the benzene ring are substituted), which has high viscosity, is easy to crystallize, and contains solids such as tar. It has poor fluidity and is therefore difficult to effectively recover. Disposal methods for polychlorinated benzene residues include incineration, electrocatalytic degradation, biodegradation, and hydrodechlorination, but they often have disadvantages such as easy secondary pollution, high energy consumption, and difficulty in industrialization.

[0003] At present, dichlorobenzene distillation residue is mainly treated by incineration, but polychlorobenzene organic waste is not easy to burn and has high energy consumption. The incineration process will produce a large amount of toxic and harmful gases, such as carbon dioxide, hydrogen chloride, phosgene, dioxins, etc. If not handled properly, it will cause serious damage to the environment. Incineration will completely decompose the waste and fail to achieve resource utilization. Moreover, polychlorobenzene compounds are hazardous wastes. There are currently strict laws and regulations on the management, operation and disposal of hazardous wastes, and the entire process of environmental supervision is carried out from generation to final disposal. Reasonable and efficient treatment of dichlorobenzene distillation residues, recycling and utilization, and improving resource utilization efficiency are important issues that need to be urgently solved in the field of chlorobenzene compound production process technology.

[0004] Some literature has reported on the recovery and utilization of dichlorobenzene distillation residue.

[0005] CN102690671B further processes the residual liquid at the bottom of the kettle produced during the separation of chlorinated aromatics, separates some low-boiling substances such as dichlorobenzene and trichlorobenzene from high-boiling substances through boiling point differences, and then separates the remaining residue into a bitumen solvent and a small amount of solid residue, thereby achieving comprehensive utilization of the residual liquid at the bottom of the kettle of chlorinated aromatics.

[0006] CN101580455A separates low-boiling-point substances in chlorobenzene residual liquid by distillation in a low-temperature negative pressure environment, and further separates high-boiling-point substances and other solid impurities in the chlorobenzene residual liquid by crystallization in a low-temperature high-pressure environment. The combination of distillation separation and crystallization is adopted to achieve reasonable disposal of the chlorobenzene residual liquid, and a dichlorobenzene product with higher purity is obtained from the residual liquid.

[0007] CN112023430B conducts continuous steam distillation of chlorobenzene distillation kettle liquid under normal pressure, separates water phase and oil phase in a water separator after condensation of gas phase, and the water phase flows back into the distillation kettle, and the released oil phase is the chlorobenzene distillation kettle liquid after decoking, thereby realizing the reasonable treatment of the chlorobenzene distillation kettle liquid.

[0008] However, the above-mentioned prior art solutions have complex processes, high energy consumption and costs, and it is difficult to efficiently utilize useful substances in the residual liquid.

[0009] In summary, efficient recovery and utilization of dichlorobenzene distillation residues that are highly viscous, easy to crystallize, and contain solid impurities such as tar is still a difficult problem to solve in the technical field of chlorobenzene compound production process technology. Summary of the invention

[0010] In order to solve the above technical problems, the present invention provides a horizontal light-removal conveying device, a light-removal conveying method, a recovery device and a recovery method for dichlorobenzene distillation residue. By arranging the stirring shaft and the stirring blades as hollow structures that are interconnected, heat medium can be introduced into the hollow structure, thereby increasing the heat exchange area of ​​the dichlorobenzene distillation residue and avoiding the temperature reduction of the high-viscosity dichlorobenzene distillation residue; at the same time, at least one sub-stirring shaft pair is staggered between the stirring blades, and the sub-stirring shaft pair has two sub-stirring shafts to form a spiral shape. During stirring, it can not only provide strong mixing but also push the material forward, thereby improving the light-removal effect of the dichlorobenzene distillation residue, and the application prospect is broad.

[0011] To achieve this object, the present invention adopts the following technical solutions:

[0012] In the first aspect, the present invention provides a horizontal de-lightening and conveying device, which includes a main body, a stirring device and a transmission device; the stirring device is arranged inside the main body, and the stirring device is connected to the transmission device to drive the stirring device to rotate; the stirring device includes a stirring shaft and a stirring blade arranged on the stirring shaft, and the stirring shaft is horizontally arranged; the stirring shaft and the stirring blade are both hollow structures, and the hollow structures of the stirring shaft and the stirring blade are interconnected, and the hollow structure is used to convey the medium; the stirring shaft includes at least one sub-stirring shaft pair arranged in parallel, and the sub-stirring shaft pair has two sub-stirring shafts; the stirring blades on the two sub-stirring shafts in the sub-stirring shaft pair are staggered.

[0013] The horizontal de-lightening conveying device provided by the present invention is mainly used for heating and conveying high-viscosity materials, wherein the heating process may also be accompanied by evaporation de-lightening or reaction, etc., and there is no restriction on this. Generally speaking, it is suitable for materials with a room temperature viscosity greater than 0.1Pa·s, and is particularly suitable for a material system with a room temperature viscosity of 1 to 50Pa·s. For high-viscosity materials, the horizontal de-lightening conveying device in the present invention has the following special features: first, it is set as a horizontal structure, which can avoid the situation where the vertical structure material falls directly; secondly, the stirring shaft and the hollow structure of the stirring blade are interconnected, and the medium (such as heat medium) can be conveyed in the hollow structure, which can greatly increase the heat transfer area of ​​the equipment on the basis of the original jacket heating, and avoid the situation of uneven local heat transfer of high-viscosity materials; thirdly, the sub-stirring shaft has two sub-stirring shafts in the center, and the stirring blades on the sub-stirring shafts are staggered and arranged in a spiral shape, providing strong mixing while pushing the material to gradually move forward, providing a driving force for the axial forward movement of the high-viscosity material, preventing the reverse flow of the material, and making the flow of the material in the equipment a plug flow, which can effectively improve the de-lightening effect of the material. Furthermore, the powerful mixing and kneading action of the body, agitator shaft and agitator blades of the horizontal delightening conveyor can effectively renew the surface of the material faster, which, combined with the heat transfer surface with self-cleaning function, ensures the high surface renewal rate required for heat and mass transfer.

[0014] In summary, the horizontal light-removal conveying device of the present invention has efficient mixing and heat exchange capabilities, can continuously and efficiently evaporate and recover low-boiling components in the dichlorobenzene distillation residue, and also realizes a self-cleaning function within the horizontal light-removal conveying device, which greatly reduces the maintenance frequency and improves the use efficiency and life of the equipment.

[0015] Preferably, the number of the sub-stirring shaft pairs is 1 to 3 pairs, preferably 1 to 2 pairs.

[0016] The number of the neutron stirring shaft pairs of the present invention can be adaptively adjusted according to the physical properties of the processed materials and the specific process.

[0017] Preferably, the stirring blade includes a first rod portion perpendicular to the stirring shaft and a second rod portion arranged at an end of the first rod portion away from the stirring shaft, the second rod portion is arranged perpendicular to the first rod portion and the first rod portion is located at the center position of the second rod portion, and the internal hollow structures of the first rod portion and the second rod portion are connected to each other.

[0018] Since high-viscosity materials are prone to sticking to the wall, the present invention further preferably provides a stirring blade with a first rod portion and a second rod portion, wherein the second rod portion can scrape the high-viscosity material on the inner wall, which can not only achieve better mass transfer and heat transfer effects for the high-viscosity material, but also have a cleaning effect on the equipment, greatly reducing the maintenance frequency and improving the use efficiency and life of the equipment.

[0019] Preferably, at both ends of the second rod portion, there are convex knobs facing the stirring shaft, and the convex knobs are hollow structures.

[0020] The present invention further preferably provides a convex knot, which has a better wall scraping effect and material conveying effect compared to only providing the second rod portion, and is more conducive to improving the removal effect of the light component.

[0021] The dynamic contour lines generated by the stirring blades during the double-axis rotation of the present invention can ensure that there are no dead angles in the equipment, thus forming a self-cleaning effect.

[0022] Preferably, the ratio of the length of the second rod portion to the length of the stirring shaft is 1:3 to 1:15, for example, it can be 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:14 or 1:15.

[0023] The present invention preferably has a length of the second rod portion within the above range, which has better material conveying and heat transfer effects. It can not only effectively avoid the situation where the mixing effect and heat transfer capacity are greatly reduced due to the second rod portion being too long, but also avoid the situation where the material is coked due to the second rod portion being too short.

[0024] Correspondingly, the number of the stirring blades on a single sub-stirring shaft is 2 to 10, for example, it can be 2, 3, 4, 5, 6, 7, 8, 9 or 10, etc.

[0025] Preferably, the ratio of the height of the convex node to the length of the first rod portion is 1:2 to 1:5, for example, it can be 1:2, 1:2.2, 1:2.5, 1:2.8, 1:3.0, 1:3.2, 1:3.5, 1:3.8, 1:4.0, 1:4.2, 1:4.5 or 1:5, etc.

[0026] Preferably, the inner diameter of the stirring shaft is 100-300 mm, for example, it may be 100 mm, 123 mm, 145 mm, 167 mm, 189 mm, 212 mm, 234 mm, 256 mm, 278 mm or 300 mm.

[0027] Preferably, the inner diameter of the hollow structure in the stirring blade is 300-500 mm, for example, it can be 300 mm, 323 mm, 345 mm, 367 mm, 389 mm, 412 mm, 434 mm, 456 mm, 478 mm or 500 mm.

[0028] Preferably, there is a gap distance between the stirring blade and the inner wall of the body.

[0029] Preferably, the gap distance is 0.5 mm to 5 cm, for example, it can be 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.3 mm, 1.5 mm, 2 mm, 5 mm, 8 mm, 9 mm, 1 cm, 1.5 cm, 2 cm, 2.5 cm, 3 cm, 3.5 cm, 4 cm, 4.5 cm or 5 cm, etc.

[0030] The present invention further preferably sets the gap distance to 0.5 mm to 5 cm, which can avoid damage to the stirring blades caused by stirring at multiple locations and can better scrape off the materials adhering to the inner wall of the main body, thereby achieving a better material stirring effect.

[0031] Preferably, the stirring shaft is connected to the medium input component and the medium output component via a rotary joint.

[0032] Preferably, the body comprises a buffer zone and a stirring zone from top to bottom, and the stirring device is arranged in the stirring zone.

[0033] The present invention further provides a buffer zone, which is provided on the upper part of the stirring zone, so as to facilitate buffering when the material is conveyed from top to bottom, and has the effects of improving process stability and protecting the horizontal de-lightening conveying device.

[0034] Preferably, the height of the stirring zone accounts for 30% to 80% of the total height of the body, for example, it may be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 70% or 80%.

[0035] When a pair of stirring shafts is used, preferably, the cross section of the stirring zone is composed of an arc of non-intersecting parts of two circles intersecting each other.

[0036] When a pair of stirring shafts are used, preferably, the angle range corresponding to the arc of the non-intersecting part is 270 to 320°, for example, it can be 270°, 276°, 282°, 287°, 293°, 298°, 304°, 309°, 315° or 320°, etc.

[0037] The cross section of the stirring zone of the present invention is in the above-mentioned shape. When installing the stirring shaft, the gap between the stirring blade and the inner walls on both sides is controlled within a limited range, thereby improving the stirring and mixing effect.

[0038] When two pairs of sub-stirring shafts or three sub-stirring shafts are used, a structure of up-and-down arrangement or left-and-right steps can be adopted, and there is no special limitation on this.

[0039] Preferably, the transmission device comprises an electric motor and a transmission part having one end connected to the electric motor and the other end connected to the stirring shaft.

[0040] Preferably, the number of the transmission parts is the same as the number of the sub-stirring shaft pairs, and a single transmission part is connected to only any one sub-stirring shaft in the sub-stirring shaft pair.

[0041] In the present invention, the number of transmission parts corresponds to the number of sub-stirring shaft pairs.

[0042] Preferably, at least one end of the stirring shaft is provided with a gear between two of the sub-stirring shafts in the sub-stirring shaft pair.

[0043] There is a gear between the two sub-stirring shafts in the sub-stirring shaft pair of the present invention. After the transmission part drives any one of the sub-stirring shafts to rotate, the sub-stirring shaft transmits the power to the other sub-stirring shaft, forming a propeller effect, thereby achieving the function of conveying materials in the horizontal direction.

[0044] Preferably, the horizontal de-lightening conveying device further comprises a jacket layer arranged outside the main body.

[0045] In the present invention, heat medium can be introduced into the jacket layer to achieve heating effect on the outer layer, and cooperate with the heat medium introduced between the stirring shaft and the stirring blades to improve the overall mass transfer and heat transfer efficiency.

[0046] Preferably, the horizontal de-lightening conveying device also includes a feed port, a discharge port and a light component outlet, the feed port is arranged at the top of one end of the horizontal de-lightening conveying device, the discharge port is arranged at the bottom of one end of the horizontal de-lightening conveying device, and the light component outlet is arranged at the top of the horizontal de-lightening conveying device and is different from the setting position of the feed port.

[0047] The present invention adopts the method of top feeding and bottom discharging.

[0048] Preferably, the horizontal de-lightening conveying device further comprises a material discharge baffle plate arranged below the material feed port, and the material discharge baffle plate is arranged in a buffer zone.

[0049] Preferably, the material discharge baffle has a hollow structure, and the hollow structure of the material discharge baffle is communicated with the jacket layer for conveying the medium.

[0050] Preferably, the outside of the feed port and the discharge port are each independently provided with a heat-insulating layer.

[0051] In order to prevent the fluidity of high-viscosity materials at the feed inlet and the discharge port from decreasing, the present invention arranges a heat-insulating layer outside the feed inlet and the discharge port to ensure the fluidity.

[0052] Preferably, the horizontal de-lightening conveying device further comprises a support frame arranged at the lower part of the main body.

[0053] In a second aspect, the present invention provides a recovery device for dichlorobenzene distillation residue, wherein the recovery device comprises the horizontal light-removal conveying device described in the first aspect.

[0054] The recovery device also includes a storage container and a light component processing unit, wherein the storage container is arranged on the upper part of the horizontal light component removal conveying device and the dichlorobenzene distillation residual liquid is transported from the storage container to the horizontal light component removal conveying device by gravity; the light component processing unit is connected to the horizontal light component removal conveying device.

[0055] The present invention arranges the storage container on the upper part of the horizontal light removal conveying device, so that the dichlorobenzene distillation residue is directly conveyed to the horizontal light removal conveying device under the action of gravity, without using a conveying device such as a pump. In addition, the dichlorobenzene distillation residue has a high viscosity and is difficult to be conveyed by a pump at room temperature.

[0056] Preferably, the material outlet of the storage container is arranged directly above the feed inlet of the horizontal de-lightening conveying device.

[0057] Preferably, the light component processing unit is connected to the light component outlet of the horizontal de-lightening conveying device.

[0058] Preferably, the light component processing unit includes a condenser, an absorption device and a recovery container; wherein the condenser is connected to the light component outlet of the horizontal de-lightening conveying device, the absorption device is connected to the gas phase outlet of the condenser, and the recovery container is connected to the liquid phase outlet of the condenser.

[0059] The condenser in the light component processing unit of the present invention is used for preliminarily recovering chlorobenzene materials in the light component discharge to reduce the load of the subsequent absorption device, wherein the content of valuable substances in the recovered condensate is as high as more than 98%, and the recovered valuable substances (polychlorobenzenes) can be converted into low-chlorinated aromatic hydrocarbons with high economic value through a catalytic hydrogenation dechlorination process.

[0060] Preferably, the absorption device includes an absorption tower, and an absorption liquid circulation and conveying device arranged at the bottom of the absorption tower, the absorption liquid circulation and conveying device connects the bottom and the top of the absorption tower for the circulation of the absorption liquid, and an absorption liquid cooler is arranged between the bottom and the top of the absorption tower.

[0061] The present invention has no special restrictions on the specific structure of the absorption tower and the fillers used. The structure and fillers well known to those skilled in the art can be used, and can also be adjusted according to actual conditions.

[0062] In a third aspect, the present invention provides a method for de-lightening and conveying highly viscous materials, wherein the de-lightening and conveying method is performed using the horizontal de-lightening and conveying device described in the first aspect.

[0063] Preferably, the light-removing and conveying method comprises:

[0064] The high-viscosity material flows by gravity into the horizontal de-lightening and conveying device, and heat medium is introduced into the stirring shaft and stirring blades of the horizontal de-lightening and conveying device, and stirring is started simultaneously to perform de-lightening and conveying to obtain light component discharge and heavy component discharge.

[0065] The method for removing light materials and conveying high-viscosity materials provided by the present invention is carried out by adopting the horizontal light-removing and conveying device described in the first aspect, which can simultaneously perform light-removal and conveying, has good stirring and heat transfer effects, can continuously and efficiently separate high-viscosity materials such as dichlorobenzene distillation residue, and reduce solid waste emissions by more than 80wt%, greatly reducing material losses and achieving efficient recycling of resources; at the same time, it greatly saves hazardous waste disposal costs and reduces production and operation costs.

[0066] Preferably, the heat medium includes water vapor, hot water or thermal oil.

[0067] Preferably, the temperature of the heat medium is 80-255°C, for example, it can be 80°C, 85°C, 90°C, 95°C, 100°C, 110°C, 120°C, 150°C, 160°C, 170°C, 180°C, 189°C, 199°C, 208°C, 218°C, 227°C, 237°C, 246°C or 255°C, etc.

[0068] Preferably, the heat medium is heat transfer oil, and the temperature of the heat transfer oil is 170-255°C, for example, it can be 170°C, 180°C, 189°C, 199°C, 208°C, 218°C, 227°C, 237°C, 246°C or 255°C.

[0069] Preferably, the high-viscosity material is dichlorobenzene distillation residue.

[0070] Preferably, the viscosity of the dichlorobenzene distillation residue is 1 to 50 Pa·s, for example, it may be 1 Pa·s, 7 Pa·s, 12 Pa·s, 18 Pa·s, 23 Pa·s, 29 Pa·s, 34 Pa·s, 40 Pa·s, 45 Pa·s or 50 Pa·s.

[0071] As mentioned above, the viscosity of the dichlorobenzene distillation residue of the present invention is 1 to 50 Pa·s, which is the viscosity at room temperature, that is, the viscosity at 25°C. This viscosity makes it difficult to flow normally at room temperature, the conventional stirring effect is poor, and mass transfer and heat transfer in the system are relatively difficult. This further reflects the excellent stirring, heat transfer and conveying effects of the high-viscosity material de-lightening and conveying method provided by the present invention.

[0072] Preferably, the dichlorobenzene distillation residue comprises benzene, chlorobenzene, dichlorobenzene, trichlorobenzene, tetrachlorobenzene, pentachlorobenzene, hexachlorobenzene and polychlorinated biphenyls.

[0073] Preferably, the dichlorobenzene distillation residue comprises, in terms of mass percentage, 0.01-0.5wt% benzene, 0.5-3wt% chlorobenzene, 0.5-5wt% dichlorobenzene, 40-60wt% trichlorobenzene, 30-55wt% tetrachlorobenzene, 1-5wt% pentachlorobenzene, 1-5wt% hexachlorobenzene and 0.5-3wt% polychlorinated biphenyls.

[0074] The recyclable chlorobenzene series materials described in the present invention include chlorobenzene, dichlorobenzene, trichlorobenzene and tetrachlorobenzene.

[0075] In the present invention, high melting point substances such as pentachlorobenzene, hexachlorobenzene and polychlorinated biphenyls are easy to crystallize in the solid phase at low temperature, which makes the transportation and stirring and mixing of the dichlorobenzene distillation residue more difficult.

[0076] Specifically, 0.01-0.5 wt% benzene, for example, can be 0.01 wt%, 0.07 wt%, 0.12 wt%, 0.18 wt%, 0.23 wt%, 0.29 wt%, 0.34 wt%, 0.4 wt%, 0.45 wt% or 0.5 wt%, etc.

[0077] 0.5-3wt% chlorobenzene, for example, can be 0.5wt%, 0.8wt%, 1.1wt%, 1.4wt%, 1.7wt%, 1.9wt%, 2.2wt%, 2.5wt%, 2.8wt% or 3wt%.

[0078] 0.5-5wt% dichlorobenzene, for example, can be 0.5wt%, 1wt%, 1.5wt%, 2wt%, 2.5wt%, 3wt%, 3.5wt%, 4wt%, 4.5wt% or 5wt%.

[0079] 40-60wt% trichlorobenzene, for example, can be 40wt%, 43wt%, 45wt%, 47wt%, 49wt%, 52wt%, 54wt%, 56wt%, 58wt% or 60wt%, etc.

[0080] 30-55wt% tetrachlorobenzene, for example, can be 30wt%, 33wt%, 36wt%, 39wt%, 42wt%, 44wt%, 47wt%, 50wt%, 53wt% or 55wt%, etc.

[0081] 1-5 wt% of pentachlorobenzene, for example, can be 1 wt%, 1.5 wt%, 1.9 wt%, 2.4 wt%, 2.8 wt%, 3.3 wt%, 3.7 wt%, 4.2 wt%, 4.6 wt% or 5 wt%.

[0082] 1-5wt% hexachlorobenzene, for example, can be 1wt%, 1.5wt%, 1.9wt%, 2.4wt%, 2.8wt%, 3.3wt%, 3.7wt%, 4.2wt%, 4.6wt% or 5wt%.

[0083] 0.5-3wt% PCBs, for example, can be 0.5wt%, 0.8wt%, 1.1wt%, 1.4wt%, 1.7wt%, 1.9wt%, 2.2wt%, 2.5wt%, 2.8wt% or 3wt%.

[0084] Polychlorinated biphenyls may be, for example, trichlorobiphenyl, tetrachlorobiphenyl, pentachlorobiphenyl, hexachlorobiphenyl, heptachlorobiphenyl, octachlorobiphenyl, nonachlorobiphenyl, decachlorobiphenyl, etc.

[0085] Preferably, the stirring speed is 20 to 200 rpm, for example, it can be 20 rpm, 40 rpm, 60 rpm, 80 rpm, 100 rpm, 120 rpm, 140 rpm, 160 rpm, 180 rpm or 200 rpm.

[0086] Preferably, the tar content in the heavy fraction output is 85-98wt%, for example, it can be 85wt%, 87wt%, 88wt%, 90wt%, 91wt%, 93wt%, 94wt%, 96wt%, 97wt% or 98wt%.

[0087] Preferably, the sum of the contents of trichlorobenzene and tetrachlorobenzene in the heavy fraction output is 2-10wt%, for example, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt% or 10wt%.

[0088] It can be seen from the composition of the above-mentioned heavy fraction output that the light fraction removal and transportation method for high-viscosity materials provided by the present invention has excellent light fraction removal effect, significantly reduces hazardous waste, and fully utilizes resources.

[0089] In a fourth aspect, the present invention provides a method for recovering chlorobenzene-based materials in dichlorobenzene distillation residue, wherein the recovery method is carried out using the dichlorobenzene distillation residue recovery device described in the second aspect, or the recovery method includes the light removal and transportation method for high-viscosity materials described in the third aspect.

[0090] The recovery method comprises:

[0091] The dichlorobenzene distillation residue flows from the storage container to the horizontal light-removal and conveying device by gravity for light-removal and conveying to obtain light component discharge and heavy component discharge;

[0092] The light component discharge is condensed to recover the liquid phase material, the non-condensable gas generated after condensation is absorbed and washed, and the chlorobenzene series material is recovered for the second time, and the tail gas after absorption and washing meets the emission standards.

[0093] The light component discharge of the present invention is first condensed to preliminarily recover chlorobenzene series materials, thereby reducing the load of a subsequent absorption device, wherein the content of valuable substances in the recovered condensate is as high as over 98%, and the recovered valuable substances (polychlorobenzenes) can be converted into low-chlorinated aromatic hydrocarbons with high economic value through a catalytic hydrogenation dechlorination process; and then absorption and washing are performed, which not only enables the gas phase to meet the emission standards, but also allows secondary recovery of chlorobenzene series materials, and has a high resource utilization rate.

[0094] Compared with the prior art, the present invention has at least the following beneficial effects:

[0095] (1) The horizontal light-removal conveying device provided by the present invention can efficiently separate and recover dichlorobenzene distillation residues with high viscosity, easy crystallization, and containing solid impurities such as tar, effectively realize resource recovery and reuse, reduce production costs, reduce the discharge of three wastes, and save hazardous waste disposal costs. It is green and environmentally friendly, suitable for industrial production, and has good market prospects;

[0096] (2) The horizontal light-removal conveying device provided by the present invention has efficient mixing and heat exchange capabilities, can continuously and efficiently evaporate and recover low-boiling-point components in dichlorobenzene residual liquid, and also realizes a self-cleaning function in the device, greatly reducing the maintenance frequency and improving the use efficiency and life of the equipment;

[0097] (3) After the dichlorobenzene distillation residue is subjected to light removal treatment by the method for removing light from high-viscosity materials provided by the present invention, under optimal conditions, the solid waste is reduced by more than 80%, and the recovery rate of chlorobenzene-based materials reaches more than 90%; the tar content in the heavy fraction output reaches more than 90wt%, and the sum of the contents of trichlorobenzene and tetrachlorobenzene is only less than 4.3wt%, with high economic and environmental values. BRIEF DESCRIPTION OF THE DRAWINGS

[0098] Figure 1 It is a schematic diagram of a horizontal de-lightening conveying device provided in Example 1 of the present invention.

[0099] Figure 2 It is a cross-sectional view of the stirring shaft arrangement in the horizontal de-lightening and conveying device provided in Example 1 of the present invention.

[0100] Figure 3 It is an enlarged view of the stirring blade in the horizontal de-lightening and conveying device provided in Example 1 of the present invention.

[0101] Figure 4 It is a schematic diagram of a recovery device for dichlorobenzene distillation residue provided in Application Example 1 of the present invention.

[0102] In the figure, 1-horizontal de-lightening and conveying device; 11-main body; 12-stirring device; 121-stirring blade; 1211-first rod; 1212-second rod; 1213-knot; 122-stirring shaft; 1221-first sub-stirring shaft; 1222-second sub-stirring shaft; 13-transmission device; 131-transmission part; 132-motor; 14-feeding port; 15-discharging port; 16-light component outlet; 17-support frame; 18-jacket layer; 2-storage container; 3-light component processing unit; 31-condenser; 32-recovery container; 33-absorption device; 331-absorption tower; 332-absorption liquid circulation and conveying device; 333-absorption liquid cooler. DETAILED DESCRIPTION

[0103] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0104] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0105] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0106] Those skilled in the art should understand that the present invention necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not belong to the main inventive point of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements and specific limitations on this.

[0107] Example 1

[0108] This embodiment provides a horizontal light-removing conveying device. Figure 1 The horizontal de-lightening and conveying device includes a main body, a stirring device and a transmission device.

[0109] The stirring device is arranged inside the body, and the stirring device is connected to the transmission device to drive the stirring device to rotate; the stirring device includes a stirring shaft and a stirring blade arranged on the stirring shaft, and the stirring shaft is arranged horizontally; the stirring shaft and the stirring blade are both hollow structures, and the hollow structures of the stirring shaft and the stirring blade are connected to each other, and the hollow structure is used to convey the medium; see Figure 2 The stirring shaft includes a pair of sub-stirring shafts arranged in parallel, wherein the pair of sub-stirring shafts has two sub-stirring shafts (a first sub-stirring shaft and a second sub-stirring shaft); the stirring blades on the two sub-stirring shafts in the pair of sub-stirring shafts are arranged alternately.

[0110] See also Figure 3 The stirring blade includes a first rod portion perpendicular to the stirring shaft and a second rod portion arranged at one end of the first rod portion away from the stirring shaft, the second rod portion is arranged perpendicular to the first rod portion and the first rod portion is located at the center of the second rod portion, and the internal hollow structures of the first rod portion and the second rod portion are connected to each other; at both ends of the second rod portion, there are convex nodes facing the stirring shaft, and the convex nodes are hollow structures; the ratio of the length of the second rod portion to the length of the stirring shaft is 1:10 (a total of 7 stirring blades are evenly distributed); the ratio of the height of the convex node to the length of the first rod portion is 1:4; the inner diameter of the stirring shaft is 150mm; the inner diameter of the hollow structure in the stirring blade is 400mm; there is a gap distance between the stirring blade and the inner wall of the body; the gap distance is 1mm.

[0111] The stirring shaft is connected to the medium input component and the medium output component through a rotary joint.

[0112] The body includes a buffer zone and a stirring zone from top to bottom, and the stirring device is arranged in the stirring zone; the height of the stirring zone accounts for 50% of the total height of the body. The cross section of the stirring zone is composed of the arc of the non-intersecting part after the intersection of two circles. The angle corresponding to the arc of the non-intersecting part (such as Figure 2The angle (indicated by letter A) is 300°.

[0113] The transmission device includes an electric motor and a transmission part connected to the electric motor at one end and to the stirring shaft at the other end; the number of the transmission parts is the same as the number of the sub-stirring shaft pairs, which is 1, and a single transmission part is only connected to any one sub-stirring shaft in the sub-stirring shaft pair; at least one end of the stirring shaft is provided with a gear between two sub-stirring shafts in the sub-stirring shaft pair.

[0114] The horizontal de-lightening conveying device further comprises a jacket layer arranged outside the main body.

[0115] The horizontal de-lightening conveying device also includes a feed port, a discharge port and a light component outlet, wherein the feed port is arranged at the top of one end of the horizontal de-lightening conveying device, the discharge port is arranged at the bottom of one end of the horizontal de-lightening conveying device, and the light component outlet is arranged at the top of the horizontal de-lightening conveying device, and is arranged at a different position from the feed port; the horizontal de-lightening conveying device also includes a discharge baffle plate arranged below the feed port, and the discharge baffle plate is arranged in a buffer zone. The discharge baffle plate has a hollow structure, and the hollow structure of the discharge baffle plate is connected to the jacket layer for conveying the medium. The outsides of the feed port and the discharge port are each independently provided with an insulation layer.

[0116] The horizontal type light-removing conveying device also includes a support frame arranged at the lower part of the main body.

[0117] Example 2

[0118] This embodiment provides a horizontal de-lightening conveying device, which is different from the embodiment 1 in that:

[0119] The ratio of the length of the second rod to the length of the stirring shaft is 1:15 (a total of 10 stirring blades are evenly distributed); the ratio of the height of the convex knot to the length of the first rod is 1:5; the inner diameter of the stirring shaft is 100mm; the inner diameter of the hollow structure in the stirring blade is 300mm; there is a gap distance between the stirring blade and the inner wall of the body; the gap distance is 0.5mm. The angle corresponding to the arc of the non-intersecting part is 270°.

[0120] The rest are the same as in Example 1 and will not be described again.

[0121] Example 3

[0122] This embodiment provides a horizontal de-lightening conveying device, which is different from the embodiment 1 in that:

[0123] The ratio of the length of the second rod to the length of the stirring shaft is 1:5 (three stirring blades are evenly distributed); the ratio of the height of the convex knot to the length of the first rod is 1:2; the inner diameter of the stirring shaft is 300 mm; the inner diameter of the hollow structure in the stirring blade is 500 mm; there is a gap distance between the stirring blade and the inner wall of the body; the gap distance is 5 cm. The angle corresponding to the arc of the non-intersecting part is 320°.

[0124] The rest are the same as in Example 1 and will not be described again.

[0125] Example 4

[0126] This embodiment provides a horizontal de-lightening conveying device. Except that no convex knot is provided on the second rod portion, the rest of the horizontal de-lightening conveying device is the same as that of Embodiment 1, and will not be described again.

[0127] Example 5

[0128] This embodiment provides a horizontal de-lightening conveying device, which is the same as the first embodiment except that the second rod portion is not provided, and will not be described in detail here.

[0129] Example 6

[0130] The present embodiment provides a horizontal de-lightening conveying device, which is the same as the first embodiment except that the ratio of the length of the second rod portion to the length of the stirring shaft is 1:2 and only one stirring blade is provided, and thus will not be described again.

[0131] Example 7

[0132] The present embodiment provides a horizontal de-lightening conveying device, which is the same as Embodiment 1 except that the ratio of the length of the second rod portion to the length of the stirring shaft is 1:22, and the number of stirring blades is maintained at 7, but the distribution spacing is increased, and the rest is not repeated here.

[0133] Example 8

[0134] The present embodiment provides a horizontal de-lightening conveying device, which is the same as the first embodiment except that no buffer zone is provided on the upper part of the main body, and will not be described in detail here.

[0135] Example 9

[0136] The present embodiment provides a horizontal de-lightening conveying device, which is the same as the first embodiment except that the angle corresponding to the arc of the intersecting part is 340°, and will not be described again.

[0137] Example 10

[0138] This embodiment provides a horizontal de-lightening conveying device, which is the same as Embodiment 1 except that the angle corresponding to the arc of the intersecting part is 250°, and will not be described again.

[0139] Comparative Example 1

[0140] This comparative example provides a horizontal de-lightening conveying device, which is the same as Example 1 except that only one stirring shaft is provided in the middle of the body, and will not be described in detail here.

[0141] Comparative Example 2

[0142] This comparative example provides a horizontal de-lightening and conveying device. Except that the stirring shaft and the stirring blades are both solid structures, the rest of the horizontal de-lightening and conveying device is the same as Example 1, and will not be repeated here.

[0143] Comparative Example 3

[0144] This comparative example provides a horizontal de-lightening conveying device, which is the same as Example 1 except that the stirring blades on the two sub-stirring shafts are not staggered but are relatively arranged on the same main body cross-section, and the rest is not repeated here.

[0145] Application Example 1

[0146] This application example provides a method for removing light substances from dichlorobenzene distillation residue, and the method for removing light substances from dichlorobenzene distillation residue is performed using the light substances removal conveying device provided in Example 1. Specifically, the method for removing light substances from dichlorobenzene distillation residue comprises:

[0147] The dichlorobenzene distillation residue (viscosity of 15.7 Pa·s at 25° C., composition including 0.05wt% benzene, 2.05wt% chlorobenzene, 1.5wt% dichlorobenzene, 45.9wt% trichlorobenzene, 45.3wt% tetrachlorobenzene, 2.5wt% pentachlorobenzene, 1.4wt% hexachlorobenzene and 1.3wt% polychlorinated biphenyls) flows by gravity into a horizontal light-removing and conveying device, and a heat medium (heat transfer oil with a temperature of 200° C.) is introduced into the stirring shaft and stirring blades of the horizontal light-removing and conveying device, and stirring at 150rpm is started simultaneously to carry out light-removing and conveying to obtain a light component discharge and a heavy component discharge.

[0148] Application Example 2

[0149] This application example provides a method for removing light substances from dichlorobenzene distillation residue, and the method for removing light substances from dichlorobenzene distillation residue is performed using the light substances removal conveying device provided in Example 2. Specifically, the method for removing light substances from dichlorobenzene distillation residue comprises:

[0150] The dichlorobenzene distillation residue (viscosity of 23.7 Pa·s at 25° C., composition including 0.5wt% benzene, 3.0wt% chlorobenzene, 0.5wt% dichlorobenzene, 40.2wt% trichlorobenzene, 50.3wt% tetrachlorobenzene, 3.5wt% pentachlorobenzene, 1.2wt% hexachlorobenzene and 0.8wt% polychlorinated biphenyls) flows by gravity into a horizontal light-removing and conveying device, and a heat medium (heat transfer oil with a temperature of 255° C.) is introduced into the stirring shaft and stirring blades of the horizontal light-removing and conveying device, and stirring at 20rpm is started simultaneously to carry out light-removing and conveying to obtain a light component discharge and a heavy component discharge.

[0151] Application Example 3

[0152] This application example provides a method for removing light substances from dichlorobenzene distillation residue, and the method for removing light substances from dichlorobenzene distillation residue is performed using the light substances removal conveying device provided in Example 2. Specifically, the method for removing light substances from dichlorobenzene distillation residue comprises:

[0153] The dichlorobenzene distillation residue (viscosity of 35.3 Pa·s at 25° C., composition including 0.2wt% benzene, 0.8wt% chlorobenzene, 0.5wt% dichlorobenzene, 55.8wt% trichlorobenzene, 30.8wt% tetrachlorobenzene, 4.8wt% pentachlorobenzene, 4.3wt% hexachlorobenzene and 2.8wt% polychlorinated biphenyls) flows by gravity into a horizontal light-removing and conveying device, and a heat medium (heat transfer oil with a temperature of 170° C.) is introduced into the stirring shaft and stirring blades of the horizontal light-removing and conveying device, and stirring at 200 rpm is started simultaneously to carry out light-removing and conveying to obtain a light component discharge and a heavy component discharge.

[0154] Application Examples 4 to 10 and Comparative Application Examples 1 to 3

[0155] Application Examples 4 to 10 and Application Comparative Examples 1 to 3 provide a method for removing light substances from dichlorobenzene distillation residue. The method for removing light substances from dichlorobenzene distillation residue is the same as Application Example 1 except that the horizontal light substances removal and conveying devices in Examples 4 to 8 and Comparative Examples 1 to 3 are respectively used, and will not be described in detail here.

[0156] Application Example 11

[0157] This application example provides a method for conveying highly viscous materials by removing light particles. The method for conveying highly viscous materials by removing light particles is performed by using the conveying device for removing light particles provided in Example 2. Specifically, the method for conveying highly viscous materials by removing light particles includes:

[0158] The high-viscosity material (viscosity of 1.0-3.0 Pa·s at 25°C, with no limitation on specific composition) flows by gravity into the horizontal de-lightening and conveying device, and a heat medium (hot water at 95°C) is introduced into the stirring shaft and stirring blades of the horizontal de-lightening and conveying device, and stirring at 180 rpm is started simultaneously to perform de-lightening and conveying to obtain light component discharge and heavy component discharge.

[0159] Test methods: The sum of the contents of trichlorobenzene and tetrachlorobenzene in the heavy component output is tested by gas chromatography-mass spectrometry; the content of tar in the heavy component output is tested by gas chromatography-mass spectrometry. The recovery rate of chlorobenzene is calculated by dividing the mass of chlorobenzene materials obtained from the light component output by the mass of chlorobenzene materials in the dichlorobenzene distillation residue originally fed; the solid waste reduction rate is calculated by 1-the mass of the heavy component output / the mass of the dichlorobenzene distillation residue originally fed.

[0160] The test results of the above application examples and application comparison examples are shown in Table 1.

[0161] Table 1

[0162]

[0163]

[0164] From Table 1, we can see the following points:

[0165] (1) It can be seen from the comprehensive application examples 1 to 3 that the light removal and transportation method of dichlorobenzene rectification residue provided by the present invention has an excellent light removal effect. During the light removal and transportation process, the mass transfer and heat transfer are relatively uniform, and no local overheating and coking occurs. The tar content in the heavy component output is more than 90wt%, and the sum of the contents of trichlorobenzene and tetrachlorobenzene is less than 4.3wt%. The recovery rate of chlorobenzene materials in the light component is more than 90%, and the amount of solid waste reduction is as high as more than 80%, with significant economic and environmental benefits.

[0166] (2) It can be seen from the combined application examples 1 and 4 that the second rod portion containing a convex knob in the application example 1 is used. Compared with the second rod portion without a convex knob in the application example 4, the sum of the contents of trichlorobenzene and tetrachlorobenzene in the application example 1 is only 2.3wt%, and the content of tar is as high as 94.6wt%, while the sum of the contents of trichlorobenzene and tetrachlorobenzene in the application example 4 is as high as 5.2wt%, and the content of tar is only 91.6wt%. This shows that the present invention has a better light removal effect by preferably using the second rod portion containing a convex knob, which is more conducive to improving the recovery rate of chlorobenzene-based materials and improving the solid waste reduction rate;

[0167] (3) It can be seen from the comprehensive application examples 1 and 5 that the stirring blade containing the second rod portion in application example 1 is used. Compared with the stirring blade without the second rod portion in application example 5, the sum of the contents of trichlorobenzene and tetrachlorobenzene in application example 1 is only 2.3wt%, and the content of tar is as high as 94.6wt%, while the sum of the contents of trichlorobenzene and tetrachlorobenzene in application example 5 is as high as 9.5wt%, and the content of tar is only 83.2wt%. In addition, application example 5 does not have a self-cleaning effect and good wall scraping performance. This shows that the present invention preferably uses a stirring blade containing a second rod portion, which has a better light removal effect, is more conducive to improving the recovery rate of chlorobenzene-based materials, and improves the solid waste reduction rate;

[0168] (4) Comprehensively analyzing Application Example 1 and Application Examples 6 to 7, it can be seen that the ratio of the length of the second rod portion to the length of the stirring shaft in Application Example 1 is 1:10. Compared with the ratios of the length of the second rod portion to the length of the stirring shaft in Application Examples 6 to 7, which are 1:2 and 1:22 respectively, the sum of the contents of trichlorobenzene and tetrachlorobenzene in Application Example 1 is only 2.3wt%, and the content of tar is as high as 94.6wt%. In Application Example 6, the material mixing capacity and heat transfer capacity of the agitator are reduced, which is not conducive to removing the light components in the dichlorobenzene distillation residue. Therefore, the sum of the contents of trichlorobenzene and tetrachlorobenzene in Application Example 6 is as high as 11.8wt%, and the tar content is only 78.3wt%, and the solid waste reduction benefit is low. In Application Example 7, local overheating occurs, resulting in coking of the material, and the recovery rate of chlorobenzene-based materials in the light components is finally reduced. This shows that the present invention is more conducive to improving the recovery rate of chlorobenzene-based materials and improving the solid waste reduction rate by preferably controlling the ratio of the length of the second rod portion to the length of the stirring shaft within a reasonable range;

[0169] (5) It can be seen from the combined application examples 1 and 8 that the buffer zone is set in the application example 1. Compared with the application example 8 without the buffer zone, although the application examples 1 and 8 can both achieve better de-lightening effects, the service life of the stirring device in the application example 1 is significantly longer than that in the application example 8, and the overall de-lightening and conveying process stability is higher.

[0170] (6) It can be seen from the combined application examples 1 and 9 to 10 that the angle range corresponding to the arc of the non-intersecting part has a great influence on the mass transfer mixing process. The present invention preferably controls the angle within a reasonable range, which has a better light-removal and transportation effect.

[0171] (7) It can be seen from the application example 1 and the application comparative examples 1 to 3 that in the application comparative example 1, only one stirring shaft is set in the middle of the main body, which makes it difficult to realize the plug flow transportation, the mixing effect is significantly reduced, and the light removal effect is significantly reduced. The sum of the contents of trichlorobenzene and tetrachlorobenzene in the final heavy component output is as high as 13.4wt%, and the tar content is only 76.7wt%; in the application comparative example 2, the stirring blades are all solid structures, the heat transfer effect is significantly reduced, the light removal effect is reduced, and local overheating and coking occur. The sum of the contents of trichlorobenzene and tetrachlorobenzene in the heavy component output is As high as 16.0wt%, and the tar content is only 79.9wt%; when the stirring blades in comparative example 3 are not staggered, the material reciprocates back and forth, disrupting the flow direction of the material, resulting in an increase in the content of chlorobenzene materials in the residue and an increase in the degree of coking. This shows that the present invention, by providing a stirring shaft and stirring blades with a hollow structure, and arranging a double-axis staggered arrangement to form a double-screw propeller structure, can be beneficial to the plug flow transportation of high-viscosity materials and efficient mass and heat transfer, thereby realizing the resource utilization and slag reduction treatment of dichlorobenzene distillation residue.

[0172] Embodiment 11

[0173] This embodiment provides a recovery device for dichlorobenzene distillation residue, see Figure 4 The recovery device includes the horizontal de-lightening conveying device described in Example 1.

[0174] The recovery device also includes a storage container and a light component processing unit, wherein the storage container is arranged on the upper part of the horizontal light component removal conveying device and the dichlorobenzene distillation residual liquid is transported from the storage container to the horizontal light component removal conveying device by gravity; the light component processing unit is connected to the horizontal light component removal conveying device.

[0175] The material outlet of the storage container is arranged just above the feed inlet of the horizontal de-lightening conveying device.

[0176] The light component processing unit is connected to the light component outlet of the horizontal de-lightening and conveying device; the light component processing unit includes a condenser, an absorption device and a recovery container; wherein the condenser is connected to the light component outlet of the horizontal de-lightening and conveying device, the absorption device is connected to the gas phase outlet of the condenser, and the recovery container is connected to the liquid phase outlet of the condenser.

[0177] The absorption device includes an absorption tower and an absorption liquid circulation and transportation device arranged at the bottom of the absorption tower. The absorption liquid circulation and transportation device connects the bottom and the top of the absorption tower for recycling the absorption liquid. An absorption liquid cooler is arranged between the bottom and the top of the absorption tower.

[0178] Embodiments 12 to 13

[0179] Embodiments 12 to 13 provide a recovery device for dichlorobenzene distillation residue, and the recovery device includes the horizontal light-removal conveying device described in Embodiments 2 to 3, respectively, and the rest is the same as Embodiment 11.

[0180] Application Example 11

[0181] This application example provides a method for recovering dichlorobenzene distillation residue, the recovery method comprising:

[0182] The dichlorobenzene distillation residue flows from the storage container by gravity to the horizontal light removal and conveying device for light removal and conveying to obtain light component discharge and heavy component discharge; the method for light removal and conveying in the horizontal light removal and conveying device is shown in Application Example 1.

[0183] The light component discharge is condensed to recover the liquid phase material, the non-condensable gas generated after condensation is absorbed and washed, and the chlorobenzene series material is recovered for the second time, and the tail gas after absorption and washing meets the emission standards.

[0184] Application Examples 12-13

[0185] Application Examples 12 to 13 provide a method for recovering dichlorobenzene distillation residue, which includes the light removal and transportation methods described in Application Examples 2 to 3, respectively, and the rest are the same as Application Example 11.

[0186] The present invention illustrates the detailed features of the present invention through the above embodiments, but the present invention is not limited to the above detailed features, that is, it does not mean that the present invention must rely on the above detailed features to be implemented. Those skilled in the art should understand that any improvement to the present invention, equivalent replacement of the technical features selected by the present invention, addition of auxiliary technical features, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A horizontal light-removing conveying device, characterized in that: The horizontal de-lightening conveying device comprises a main body, a stirring device and a transmission device; The stirring device is arranged inside the body, and the stirring device is connected to the transmission device to drive the stirring device to rotate; The stirring device comprises a stirring shaft and a stirring blade arranged on the stirring shaft, and the stirring shaft is arranged horizontally; The stirring shaft and the stirring blade are both hollow structures, and the hollow structures of the stirring shaft and the stirring blade are interconnected, and the hollow structure is used for conveying the medium; The stirring shaft comprises at least one pair of sub-stirring shafts arranged in parallel, wherein the pair of sub-stirring shafts comprises two sub-stirring shafts; and the stirring blades on the two sub-stirring shafts in the pair of sub-stirring shafts are arranged alternately.

2. The horizontal de-lightening conveying device according to claim 1 is characterized in that: The number of the sub-stirring shaft pairs is 1 to 3 pairs, preferably 1 to 2 pairs; Preferably, the stirring blade comprises a first rod portion perpendicular to the stirring shaft and a second rod portion arranged at an end of the first rod portion away from the stirring shaft, the second rod portion is arranged perpendicular to the first rod portion and the first rod portion is located at the center of the second rod portion, and the internal hollow structures of the first rod portion and the second rod portion are connected to each other; Preferably, at both ends of the second rod portion, there are convex knots facing the stirring shaft, and the convex knots are hollow structures; Preferably, the ratio of the length of the second rod portion to the length of the stirring shaft is 1:3 to 1:15; Preferably, the ratio of the height of the convex knot to the length of the first rod portion is 1:2 to 1:5; Preferably, the inner diameter of the stirring shaft is 100 to 300 mm; Preferably, the inner diameter of the hollow structure in the stirring blade is 300 to 500 mm; Preferably, there is a gap distance between the stirring blade and the inner wall of the body; Preferably, the gap distance is 0.5 mm to 5 cm; Preferably, the stirring shaft is connected to the medium input component and the medium output component via a rotary joint; Preferably, the body comprises a buffer zone and a stirring zone from top to bottom, and the stirring device is arranged in the stirring zone; Preferably, the height of the stirring zone accounts for 30% to 80% of the total height of the body.

3. The horizontal de-lightening conveying device according to claim 1 or 2, characterized in that: The transmission device includes a motor and a transmission part having one end connected to the motor and the other end connected to the stirring shaft; Preferably, the number of the transmission parts is the same as the number of the sub-stirring shaft pairs, and a single transmission part is connected to only any one sub-stirring shaft in the sub-stirring shaft pair; Preferably, at least one end of the stirring shaft is provided with a gear between two of the sub-stirring shafts in the sub-stirring shaft pair.

4. The horizontal de-lightening conveying device according to any one of claims 1 to 3, characterized in that: The horizontal light-removing conveying device further comprises a jacket layer arranged outside the body; Preferably, the horizontal de-lightening conveying device further comprises a feed inlet, a discharge port and a light component outlet, the feed inlet is arranged at the top of one end of the horizontal de-lightening conveying device, the discharge port is arranged at the bottom of one end of the horizontal de-lightening conveying device, and the light component outlet is arranged at the top of the horizontal de-lightening conveying device and is arranged at a different position from the feed inlet; Preferably, the horizontal de-lightening conveying device further comprises a material discharge baffle plate arranged below the material feed port, and the material discharge baffle plate is arranged in a buffer zone; Preferably, the material discharge baffle has a hollow structure, and the hollow structure of the material discharge baffle is communicated with the jacket layer for conveying the medium; Preferably, the outside of the feed port and the discharge port are each independently provided with a heat-insulating layer.

5. A recovery device for dichlorobenzene distillation residue, characterized in that: The recovery device comprises the horizontal light-removing conveying device according to any one of claims 1 to 4; The recovery device also includes a storage container and a light component processing unit, wherein the storage container is arranged on the upper part of the horizontal light component removal conveying device and the dichlorobenzene distillation residual liquid is transported from the storage container to the horizontal light component removal conveying device by gravity; the light component processing unit is connected to the horizontal light component removal conveying device.

6. The recovery device according to claim 5, characterized in that: The material outlet of the storage container is arranged just above the feed inlet of the horizontal de-lightening conveying device; Preferably, the light component processing unit is connected to the light component outlet of the horizontal light component removal conveying device; Preferably, the light component processing unit comprises a condenser, an absorption device and a recovery container; wherein the condenser is connected to the light component outlet of the horizontal light-removing conveying device, the absorption device is connected to the gas phase outlet of the condenser, and the recovery container is connected to the liquid phase outlet of the condenser; Preferably, the absorption device includes an absorption tower, and an absorption liquid circulation and conveying device arranged at the bottom of the absorption tower, the absorption liquid circulation and conveying device connects the bottom and the top of the absorption tower for the circulation of the absorption liquid, and an absorption liquid cooler is arranged between the bottom and the top of the absorption tower.

7. A method for de-lightening and conveying highly viscous materials, the method for de-lightening and conveying being carried out by using the horizontal de-lightening and conveying device according to any one of claims 1 to 4.

8. The method for removing lightness and conveying according to claim 7, characterized in that: The light-removal and transportation method comprises: The high-viscosity material flows by gravity into the horizontal de-lightening and conveying device, and heat medium is introduced into the stirring shaft and stirring blades of the horizontal de-lightening and conveying device, and stirring is started simultaneously to perform de-lightening and conveying to obtain light component discharge and heavy component discharge.

9. The method for removing lightness and conveying according to claim 7 or 8, characterized in that: The heat medium includes water vapor, hot water or heat transfer oil; Preferably, the temperature of the heat medium is 80-255°C; Preferably, the heat medium is heat transfer oil, and the temperature of the heat transfer oil is 170-255°C; Preferably, the high-viscosity material is dichlorobenzene distillation residue; Preferably, the viscosity of the dichlorobenzene distillation residue is 1 to 50 Pa·s; Preferably, the dichlorobenzene distillation residue comprises benzene, chlorobenzene, dichlorobenzene, trichlorobenzene, tetrachlorobenzene, pentachlorobenzene, hexachlorobenzene and polychlorinated biphenyls; Preferably, the dichlorobenzene distillation residue comprises, in terms of mass percentage, 0.01-0.5wt% benzene, 0.5-3wt% chlorobenzene, 0.5-5wt% dichlorobenzene, 40-60wt% trichlorobenzene, 30-55wt% tetrachlorobenzene, 1-5wt% pentachlorobenzene, 1-5wt% hexachlorobenzene and 0.5-3wt% polychlorinated biphenyls; Preferably, the stirring speed is 20 to 200 rpm; Preferably, the tar content in the heavy fraction output is 85-98wt%; Preferably, the sum of the contents of trichlorobenzene and tetrachlorobenzene in the heavy fraction output is 2-10 wt%.

10. A method for recovering chlorobenzene-based materials from dichlorobenzene distillation residue, the method being carried out using the dichlorobenzene distillation residue recovery device of claim 5 or 6, or the method comprising the light-removing and conveying method for high-viscosity materials of any one of claims 7 to 9; The recovery method comprises: The dichlorobenzene distillation residue flows from the storage container to the horizontal light-removal and conveying device by gravity for light-removal and conveying to obtain light component discharge and heavy component discharge; The light component discharge is condensed to recover the liquid phase material, the non-condensable gas generated after condensation is absorbed and washed, and the chlorobenzene series material is recovered for the second time, and the tail gas after absorption and washing meets the emission standards.

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