A toluene recovery device

Abstract

This invention discloses a toluene recovery device, relating to the technical field of separation. It includes a filtration mechanism, a drying mechanism, and a condensation mechanism. The filtration mechanism includes a support assembly and a filter assembly. The filter assembly includes a frame, a filter box, and a shafted auger. The frame covers and rests on the filter box, forming a conveying channel for the reaction liquid to flow through. The shafted auger is housed within the conveying channel, and the spacing between adjacent blades of the auger decreases sequentially along its conveying direction to compress the reaction liquid into a ring-shaped solid. The drying mechanism includes a vapor generating assembly, a drying chamber, and a jet shaft. The jet shaft has a hollow structure, and multiple rings of air holes are formed along its extension direction on its shaft. The condensation mechanism is fixedly connected to the frame and has a condensation inlet connected to a drying outlet via a pipeline. The condensation mechanism is used to condense toluene. This invention solves the technical problem of toluene recovery.

Description

Technical Field

[0001] This invention relates to the field of separation technology, and more particularly to a toluene recovery device. Background Technology

[0002] Ethylene bis-stearamide is a hard, brittle, white, high-melting-point wax. Its industrial form consists of slightly yellowish, fine particles. It is non-toxic, has no side effects on the human body, and is insoluble in most solvents at room temperature. Ethylene bis-stearamide can be used as a lubricant and dispersant in plastics processing, rubber processing, and coatings. The mainstream method for industrial production of high-purity ethylene bis-stearamide is the toluene solvent method. This method uses stearic acid and ethylenediamine as raw materials, and toluene as a solvent, to catalytically dehydrate and amidate the resulting product to produce ethylene bis-stearamide.

[0003] Toluene is volatile and toxic, and its cost is relatively high. Currently, the production of ethylene bis-stearamide using the toluene solvent method typically requires toluene recovery. However, in existing toluene recovery processes, the precipitated solids easily clog the filter screen, affecting the effective recovery of toluene. Summary of the Invention

[0004] In view of this, the present invention provides a toluene recovery device to solve the technical problem of toluene recovery.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A toluene recovery device, the recovery device comprising: A filtration mechanism includes a support assembly and a filter assembly. The support assembly supports the filter assembly at an angle downwards. The filter assembly includes a frame, a filter box, and a shafted auger. The frame covers and rests on the filter box. The frame and the filter box form a conveying channel for the reaction liquid to flow through. The shafted auger is housed within the conveying channel. The spacing between adjacent blades of the shafted auger decreases sequentially along its conveying direction to compress the reaction liquid into a ring-shaped solid. The cover of the filter box has a gap to divide it into an upper cover and a lower cover. The upper cover has several filter holes communicating with the gap. The gap extends outside the filtration mechanism. The drying mechanism includes a steam generating assembly, a drying chamber, and a jet shaft. The drying chamber has a steam inlet and a material outlet. The jet shaft has a hollow structure, and one end of the jet shaft is fixedly connected to the shaft of the auger to guide the annular solid to move toward the material outlet. Multiple air holes are formed along the extension direction of the jet shaft. The steam generating assembly sprays air into the jet shaft through the steam inlet to dry the annular solid and cause the toluene in the annular solid to evaporate. A drying outlet is provided at the top of the drying chamber. A condensing mechanism is fixedly connected to the frame and has a condensing inlet. The condensing inlet is connected to the drying outlet via a pipeline. The condensing mechanism is used to condense toluene.

[0006] In some embodiments of the toluene recovery device, the recovery device further includes a steam mechanism whose output end is connected to the interior of the filter box and near the bottom, and is used to introduce water vapor at a temperature of 90°C or higher into the filter box to heat the interlayer gap and the top cover, the top of the top cover being provided with a gas outlet.

[0007] In some embodiments of the toluene recovery device, the drying mechanism further includes an annular sleeve, which is fitted onto the jet shaft and coaxial with it. The end of the annular sleeve is fixedly connected to the inner wall of the drying chamber, and the annular sleeve has multiple holes along its axial direction.

[0008] In some embodiments of the toluene recovery device, the top cover includes a first section and a second section, which are arranged vertically. The first section extends along the direction of the reaction liquid transport, and the second section is arranged parallel to the bottom sidewall of the filter box to extend the interlayer gap.

[0009] In some embodiments of the toluene recovery device, the support assembly includes a support box, a support spring, and a universal bracket. The opening of the support box can support the box frame and the filter box. The support spring and the universal bracket are both located inside the support box. One end of the support spring is fixedly connected to the bottom of the support box, and the other end is fixedly connected to the filter box. One end of the universal bracket is fixedly connected to the bottom of the support box, and the other end is fixedly connected to the filter box.

[0010] In some embodiments of the toluene recovery device, the support box is further provided with a partition, which separates the internal space of the support box to form an outflow space corresponding to the interlayer gap, and the support box has an outlet on its side wall at the position corresponding to the outflow space.

[0011] In some embodiments of the toluene recovery device, the support assembly further includes a hydraulic module having one input head and three output heads. The input head is attached to the top sidewall of the filter box, and the ends of the three output heads abut against the filter box. The shafted auger has a protrusion at the corresponding input end, and the input head is located on the rotation path of the protrusion so that the input head can be pressed during rotation. Pressing the input head can cause the three output heads to touch the filter box, thereby causing the top cover to vibrate.

[0012] In some embodiments of the toluene recovery device, the filter box further includes multiple elastic elements, each of which is housed within the filter box. One end of each elastic element is fixedly connected to the bottom of the filter box, and the other end is fixedly connected to the lower cover. The elastic elements are arranged sequentially at intervals along the direction of reaction liquid transport.

[0013] In some embodiments of the toluene recovery device, the recovery device further includes a negative pressure module, and the condensation mechanism also has a negative pressure opening. The negative pressure module is connected to the negative pressure opening through a negative pressure pipeline so that the condensation mechanism can draw air from the drying chamber under negative pressure.

[0014] In some embodiments of the toluene recovery device, the lid and bottom of the drying chamber have a sandwich structure.

[0015] Implementing the embodiments of the present invention will have at least the following beneficial effects: The aforementioned toluene recovery device has the technical advantage of facilitating toluene recovery. Specifically, the present invention has a filtration mechanism, a drying mechanism, and a condensation mechanism. The filtration mechanism can filter the reaction liquid. Firstly, the filtration mechanism can filter out ethylene bis-stearamide in the reaction liquid containing toluene solvent. Secondly, it can squeeze out toluene through the compression action of a shafted auger. The remaining impurities that form cyclic solids are then dried by the drying mechanism, which can further volatilize the toluene within the cyclic solids. After the toluene volatilizes, it enters the condensation mechanism for condensation, thereby recovering toluene and solving the technical problem of toluene recovery. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the recycling device in one embodiment; Figure 2 for Figure 1 An exploded structural diagram of a portion of the recovery device shown. Figure 3 for Figure 2 Axonometric view of the middle filter box structure after cross-section; Figure 4 for Figure 3 A magnified structural diagram of part A in the middle; Figure 5 for Figure 3 A magnified structural diagram of part B in the middle section; Figure 6 for Figure 1 Schematic diagram of the drying mechanism; Figure 7 for Figure 6 Axonometric view after sectioning; Figure 8 for Figure 2 Bottom view of the middle frame.

[0018] in: 1. Support assembly; 11. Support box; 111. Outlet; 12. Support spring; 13. Universal bracket; 14. Partition plate; 15. Hydraulic module; 151. Input head; 152. Output head; 2. Filter assembly; 21. Frame; 22. Filter box; 221. Top cover; 2211. First section; 2212. Second section; 222. Bottom cover; 223. Elastic element; 224. Air outlet; 225. Interlayer gap; 23. Shafted auger; 24. Conveying channel; 25. Protrusion; 3. Drying mechanism; 31. Drying chamber; 311. Steam inlet; 312. Material outlet; 32. Jet shaft; 33. Annular sleeve; 4. Condensation mechanism; 5. Steam mechanism; 6. Negative pressure pipeline. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] It should be emphasized and explained here that the various connection methods involved in this invention can be arbitrary unless otherwise specified. For example, fixed connection can be achieved by bolts and nuts for detachable fixing, welding or integral molding, etc. Sliding connection can be achieved by groove-like or guide rail-like structures of various shapes, and rotating connection can be achieved by hinges, shafts, etc. Any existing method that can achieve the corresponding connection relationship is acceptable.

[0023] Ethylene bis-stearamide is insoluble in both toluene and water at room temperature (25°C). It becomes slightly soluble in toluene at 90°C, approximately 0.18 g / 100 mL. However, at 90°C, impurities in the toluene solvent process, such as ethylenediamine monostearate (a reaction intermediate), unreacted stearic acid, low-molecular-weight amide byproducts, and colored oligomers, are completely dissolved in toluene.

[0024] The following is combined Figure 1-8 The toluene recovery apparatus involved in this invention will be further explained and described.

[0025] A toluene recovery device includes a filtration mechanism, a drying mechanism 3, and a condensation mechanism 4. The filtration mechanism includes a support assembly 1 and a filter assembly 2. The support assembly 1 supports the filter assembly 2 at an angle downwards. The filter assembly 2 includes a frame 21, a filter box 22, and a shafted auger 23. The frame 21 covers and rests on the filter box 22. The frame 21 and the filter box 22 form a conveying channel 24 for the reaction liquid to flow through. The shafted auger 23 is housed within the conveying channel 24. The spacing between adjacent blades of the shafted auger 23 decreases sequentially along its conveying direction to compress the reaction liquid into a ring-shaped solid. The cover of the filter box 22 has a gap 225 to divide it into an upper cover 221 and a lower cover 222. The upper cover 221 has several filter holes communicating with the gap 225, which extends outside the filtration mechanism. The drying mechanism 3 includes a steam generating assembly, a drying chamber 31, and a jet shaft 32. The drying chamber 31 has a steam inlet 311 and a material outlet 312. The jet shaft 32 is a hollow structure, and one end of the jet shaft 32 is fixedly connected to the shaft of the auger 23 to guide the annular solid to move towards the material outlet 312. Multiple air holes are formed along the extension direction of the jet shaft 32. The steam generating assembly sprays air into the jet shaft 32 through the steam inlet 311 to dry the annular solid and cause the toluene in the annular solid to evaporate. A drying outlet is provided at the top of the drying chamber 31. The condensing mechanism 4 is fixedly connected to the frame 21 and has a condensing inlet. The condensing inlet is connected to the drying outlet through a pipeline. The condensing mechanism 4 is used to condense toluene.

[0026] In this embodiment, the filtration mechanism can filter the reaction solution. The filtration mechanism can filter out ethylene bis-stearamide in the reaction solution of toluene solvent. The filtration mechanism can also squeeze out toluene through the compression action of the screed 23. The impurities that remain and form cyclic solids are then dried by the drying mechanism 3, which can further volatilize the toluene in the cyclic solids. After the toluene volatilizes, it enters the condensation mechanism 4 for condensation, thereby recovering toluene and solving the technical problem of toluene recovery.

[0027] Specifically, the filtration mechanism can filter out the product ethylene bis-stearamide in the reaction solution through the filter holes on the top cover 221. The product is then discharged through the interlayer gap 225. Then, the impurities and toluene are compressed by the screed 23. During the compression process, some of the toluene will evaporate and enter the drying oven 31. Under the action of steam, the toluene in the ring solid will evaporate. The evaporated toluene is cooled by the condensation mechanism 4, which further precipitates the impurities that flow out with it. A filter screen can be installed on the outlet pipe of the condensation mechanism 4 to obtain a purer toluene.

[0028] In addition, the pore size of the filter is set to 800 mesh because the product ethylene bis-stearamide is generally in the tens of mesh size, with the smallest pore size being 600 mesh. Setting it to 800 mesh prevents product loss.

[0029] In one embodiment of a toluene recovery device, the recovery device further includes a steam mechanism 5, the output end of which is connected to the interior of the filter box 22 near the bottom, and is used to introduce water vapor at a temperature of 90°C or higher into the filter box 22 to heat the interlayer gap 225 and the top cover 221. The top of the top cover 221 is provided with a gas outlet 224.

[0030] In this embodiment, when the temperature is raised to 90°C, ethylene bis-stearamide is slightly soluble in toluene, about 0.18 g / 100 mL. However, at 90°C, impurities such as monostearate ethylenediamine amide (reaction intermediate), unreacted stearic acid, low molecular weight amide byproducts, and colored oligomers in the toluene solvent process are completely dissolved in toluene. Thus, under the action of the vapor mechanism 5, the reaction solution can be maintained at a high temperature above 90°C, thereby dissolving the impurities in toluene and obtaining the pure product ethylene bis-stearamide, preventing impurities from flowing out of the interlayer gap 225 along with the product.

[0031] In one embodiment of a toluene recovery device, the drying mechanism 3 further includes an annular sleeve 33, which is sleeved on the jet shaft 32 and coaxial with the jet shaft 32. The end of the annular sleeve 33 is fixedly connected to the inner wall of the drying chamber 31, and the annular sleeve 33 has multiple holes along its axial direction.

[0032] In this embodiment, the annular sleeve 33 prevents powder from being blown away. Specifically, preferably, the axes of the jet shaft 32 and the auger 23 are collinear and have the same diameter.

[0033] In one embodiment of a toluene recovery device, the top cover 221 includes a first section 2211 and a second section 2212, which are arranged vertically. The first section 2211 extends along the direction of reaction liquid transport, and the second section 2212 is arranged parallel to the bottom side wall of the filter box 22 to extend the interlayer gap 225.

[0034] In this embodiment, specifically, the upper cover 221 is L-shaped and is fastened to the lower cover 222. One end of the upper cover 221 is fixedly connected to the lower cover 222, which can be integrally formed or in other ways. The other end abuts against the support component 1. Through the arrangement of this embodiment, the interlayer gap 225 can be extended, making its path turn, which facilitates the outflow of the product.

[0035] In one embodiment of a toluene recovery device, the support assembly 1 includes a support box 11, a support spring 12, and a universal bracket 13. The opening of the support box 11 can support the box 11 frame and the filter box 22. The support spring 12 and the universal bracket 13 are both located inside the support box 11. One end of the support spring 12 is fixedly connected to the bottom of the support box 11, and the other end is fixedly connected to the filter box 22. One end of the universal bracket 13 is fixedly connected to the bottom of the support box 11, and the other end is fixedly connected to the filter box 22.

[0036] In this embodiment, the support box 11 is matched in size with the frame 21, which facilitates the support of the support box 11 and the filter box 22. Through the support of the support spring 12 and the universal bracket 13, rigid support can be avoided, and a certain elastic support can be provided to facilitate the vibration of the filter box 22. This can not only prevent the filter holes from being blocked, but also prevent long-term damage to the support structure during the operation of the device.

[0037] Specifically, the support spring 12 rests against the high end of the filter box 22, and the universal bracket 13 rests against the bottom end.

[0038] In one embodiment of a toluene recovery device, a partition 14 is also provided inside the support box 11. The partition 14 divides the internal space of the support box 11 to form an outflow space corresponding to the interlayer gap 225. An outlet 111 is provided on the side wall of the support box 11 at the position corresponding to the outflow space.

[0039] In this embodiment, an outflow space is formed by setting a partition 14. The outflow space can be used to receive the product flowing out from the interlayer gap 225 and then guided to the outside through the outlet 111.

[0040] In one embodiment of a toluene recovery device, the support assembly 1 further includes a hydraulic module 15, which has an input head 151 and three output heads 152. The input head 151 is attached to the top side wall of the filter box 22, and the ends of the three output heads 152 all abut against the filter box 22. A screed 23 has a protrusion 25 corresponding to the input end, and the input head 151 is located on the rotation path of the protrusion 25 so that the input head 151 can be pressed during rotation. Pressing the input head 151 causes the three output heads 152 to touch the filter box 22, thereby causing the top cover 221 to vibrate.

[0041] In this embodiment, the hydraulic module 15 has one input head 151 and three output heads 152. With the rotation of the protrusion 25, the auger 23 rotates once and triggers the hydraulic module 15 once. This causes the three output heads 152 to strike the filter box 22, which in turn causes the filter box 22 to vibrate slightly and prevents the filter holes from becoming clogged.

[0042] In one embodiment of a toluene recovery device, the filter box 22 further includes a plurality of elastic elements 223, each elastic element 223 being housed within the filter box 22. One end of each elastic element 223 is fixedly connected to the bottom of the filter box 22, and the other end is fixedly connected to the lower cover 222. The elastic elements 223 are arranged sequentially at intervals along the direction of reaction liquid transport.

[0043] In this embodiment, by setting multiple elastic elements 223, a buffering effect can be achieved. Under the impact of the output head 152, the support spring 12 can be used for elastic adjustment, thereby achieving a better vibration effect.

[0044] In one embodiment of a toluene recovery device, the recovery device further includes a negative pressure module, and the condensation mechanism 4 also has a negative pressure opening. The negative pressure module is connected to the negative pressure opening through a negative pressure pipeline 6 so that the condensation mechanism 4 can draw air from the drying chamber 31 under negative pressure.

[0045] In this embodiment, a negative pressure module is set up. The negative pressure module can be a vacuum pump or other air extraction device that can generate a small negative pressure. The purpose is to make the airflow in the drying chamber 31 tend to flow towards the inside of the condensation mechanism 4, so as to prevent toluene from escaping from other outlets.

[0046] In one embodiment of a toluene recovery device, the lid and bottom of the drying chamber 31 have a sandwich structure.

[0047] In this embodiment, by setting it as a sandwich structure, better heat preservation can be achieved, and hot steam is introduced into the drying oven 31.

[0048] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A toluene recovery device, characterized in that, The recycling device includes: A filtration mechanism includes a support assembly and a filter assembly. The support assembly supports the filter assembly at an angle downwards. The filter assembly includes a frame, a filter box, and a shafted auger. The frame covers and rests on the filter box. The frame and the filter box form a conveying channel for the reaction liquid to flow through. The shafted auger is housed within the conveying channel. The spacing between adjacent blades of the shafted auger decreases sequentially along its conveying direction to compress the reaction liquid into a ring-shaped solid. The cover of the filter box has a gap to divide it into an upper cover and a lower cover. The upper cover has several filter holes communicating with the gap. The gap extends outside the filtration mechanism. The drying mechanism includes a steam generating assembly, a drying chamber, and a jet shaft. The drying chamber has a steam inlet and a material outlet. The jet shaft has a hollow structure, and one end of the jet shaft is fixedly connected to the shaft of the auger to guide the annular solid to move toward the material outlet. Multiple air holes are formed along the extension direction of the jet shaft. The steam generating assembly sprays air into the jet shaft through the steam inlet to dry the annular solid and cause the toluene in the annular solid to evaporate. A drying outlet is provided at the top of the drying chamber. A condensing mechanism is fixedly connected to the frame and has a condensing inlet. The condensing inlet is connected to the drying outlet via a pipeline. The condensing mechanism is used to condense toluene.

2. The toluene recovery apparatus as described in claim 1, characterized in that, The recycling device also includes a steam mechanism, the output end of which is connected to the interior of the filter box near the bottom, and is used to introduce water vapor at a temperature of 90°C or higher into the filter box to heat the interlayer gap and the top cover. The top of the top cover is provided with an air outlet.

3. The toluene recovery apparatus as described in claim 1, characterized in that, The drying mechanism further includes an annular sleeve, which is fitted onto the jet shaft and coaxial with it. The end of the annular sleeve is fixedly connected to the inner wall of the drying chamber, and the annular sleeve has multiple holes along its axial direction.

4. The toluene recovery apparatus as described in claim 1, characterized in that, The top cover includes a first section and a second section, which are arranged vertically. The first section extends along the direction of the reaction liquid delivery, and the second section is arranged parallel to the bottom side wall of the filter box to extend the interlayer gap.

5. The toluene recovery apparatus as described in claim 1, characterized in that, The support assembly includes a support box, a support spring, and a universal bracket. The opening of the support box can support the frame and the filter box. The support spring and the universal bracket are both located inside the support box. One end of the support spring is fixedly connected to the bottom of the support box, and the other end is fixedly connected to the filter box. One end of the universal bracket is fixedly connected to the bottom of the support box, and the other end is fixedly connected to the filter box.

6. The toluene recovery apparatus as described in claim 5, characterized in that, The support box is also provided with a partition, which divides the internal space of the support box to form an outflow space corresponding to the interlayer gap. The support box has an outlet on its side wall at the position corresponding to the outflow space.

7. The toluene recovery apparatus as described in claim 5, characterized in that, The support assembly also includes a hydraulic module, which has one input head and three output heads. The input head is attached to the top side wall of the filter box, and the ends of the three output heads abut against the filter box. The shafted auger has a protrusion at the corresponding input end, and the input head is located on the rotation path of the protrusion so that the input head can be pressed during rotation. Pressing the input head can cause the three output heads to touch the filter box, thereby causing the top cover to vibrate.

8. The toluene recovery apparatus as described in claim 7, characterized in that, The filter box also includes multiple elastic elements, each of which is housed within the filter box. One end of each elastic element is fixedly connected to the bottom of the filter box, and the other end is fixedly connected to the lower cover. The elastic elements are arranged sequentially at intervals along the direction of reaction liquid delivery.

9. The toluene recovery apparatus as described in claim 1, characterized in that, The recovery device also includes a negative pressure module, and the condensation mechanism also has a negative pressure opening. The negative pressure module is connected to the negative pressure opening through a negative pressure pipeline so that the condensation mechanism can draw air from the drying chamber under negative pressure.

10. The toluene recovery apparatus as described in claim 1, characterized in that, The lid and bottom of the drying oven have a sandwich structure.

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