Phase transfer catalyst separation and recovery equipment

Abstract

The utility model relates to the technical field of catalyst separation and recovery, in particular to phase transfer catalyst separation and recovery equipment. Comprising a machine frame, a sealing cover is arranged outside the machine frame, and the device further comprises a feeding mechanism arranged on the sealing cover, a micro-positive pressure maintaining connector inside the sealing cover, an oxygen content measuring connector, a nitrogen connector, a washing liquid connector, an anti-static facility and the like, a vacuum chamber is arranged on the machine frame, and filter cloth and a control mechanism are arranged on the outer periphery of the vacuum chamber. A filter cake stripping, collecting and cleaning mechanism is arranged on the filter cloth; the vacuum chamber is connected with a plurality of vacuum tanks. The closed cover is designed to be totally closed, so that internal micro-positive pressure is ensured, multi-point and uniform material distribution of the feeding mechanism is ensured, the vacuum disc adsorbs the filter belt through negative pressure, liquid in materials on the filter belt is pumped away, a catalyst-containing filter cake is obtained, the cleaning mechanism can wash the filter cake for multiple times and clean the filter belt, the flow of cleaning liquid can be adjusted, and the cleaning efficiency is improved. An automatic deviation rectifying device is arranged on the filter belt, and the filter belt can be subjected to variable-frequency speed regulation.

Description

Technical Field

[0001] The utility model relates to the technical field of catalyst separation and recovery, in particular to a phase transfer catalyst separation and recovery device for directly oxidizing allyl chloride with hydrogen peroxide to produce epichlorohydrin. Background Art

[0002] The catalyst for directly oxidizing allyl chloride with hydrogen peroxide to produce epichlorohydrin needs to be recycled. The commonly used recycling method at present is to use a centrifuge for centrifugal recovery. This method has a large shearing force on the catalyst, easily causes emulsification of the catalyst, increases the separation difficulty of the catalyst, reduces the recovery rate of the catalyst, and has a high requirement for the solid content of the treatment liquid, narrowing the application range. Therefore, there is an urgent need for a catalyst recovery device that can improve the recovery rate and recovery amount of the catalyst, has low energy consumption, and is easy to operate. Summary of the Invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a phase transfer catalyst separation and recovery device for directly oxidizing allyl chloride with hydrogen peroxide to produce epichlorohydrin, so as to solve the problems of low solid content and low recovery rate of the existing catalyst recovery device.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A phase transfer catalyst separation and recovery device for directly oxidizing allyl chloride with hydrogen peroxide to produce epichlorohydrin, including a frame, a closed cover is arranged outside the frame, and further includes a feeding mechanism arranged on the closed cover, a vacuum chamber arranged on the frame, a filter cloth mechanism arranged on the outer peripheral side of the vacuum chamber, a cleaning mechanism arranged on the filter cloth mechanism, and a plurality of vacuum tanks are connected in the vacuum chamber.

[0005] Further, the filter cloth mechanism includes a driving roller and a plurality of driving rollers arranged around the vacuum chamber, and a filter belt is jointly supported on the driving roller and the driving rollers.

[0006] Further, the feeding mechanism includes a fish-tail type cloth trough, a plurality of guiding rib strips are arranged in the cloth trough, and the discharge port of the cloth trough is arranged above the filter cloth mechanism.

[0007] Further, a cleaning mechanism is arranged on the filter cloth mechanism, including a spray pipe and a nozzle arranged at the end of the spray pipe. The nozzle includes a catalyst washing nozzle and a filter belt washing nozzle, and multiple groups of catalyst washing nozzles and filter belt washing nozzles are provided; The washing liquid of the catalyst washing nozzle and the filter belt washing nozzle is allyl chloride.

[0008] Further, a tensioning mechanism is arranged on the filter cloth mechanism, including a tensioning cylinder fixed to the frame, a swing bracket arranged at the output end of the tensioning cylinder, and a tensioning roller arranged on the swing bracket. The tensioning roller is used to tension the filter belt.

[0009] Furthermore, a filter cake stripping mechanism is provided on one side of the filter cloth mechanism. The filter cake stripping mechanism is a scraper for stripping the catalyst on the filter belt.

[0010] A deviation rectifying mechanism is provided on the filter cloth mechanism. The deviation rectifying device includes pneumatic guides symmetrically arranged on both sides of the filter belt to prevent the filter belt from folding and wrinkling and to correct the deviation of the filter belt.

[0011] Furthermore, the vacuum chamber includes a vacuum disc and a grid plate provided on the vacuum disc. A driving cylinder is provided on one side of the vacuum disc for pushing the vacuum disc to move reciprocally.

[0012] The vacuum tank is provided with a vacuum switching valve, including a vacuum valve and a vent valve, and the action directions of the two valves are opposite.

[0013] A filter belt limit switch is provided on one side of the filter cloth mechanism.

[0014] Furthermore, a variable frequency motor is provided on the driving roller. The variable frequency motor adjusts the rotational speed by changing the frequency of the motor, making the running speed of the filter belt adjustable.

[0015] Furthermore, the closed cover is provided with a slightly positive pressure interface, an oxygen content measurement interface, a nitrogen introduction interface, and a multi-point washing liquid interface.

[0016] A control mechanism and an anti-static facility are provided inside the sealing cover.

[0017] Furthermore, a filter cake collection mechanism is provided directly below the filter cake stripping mechanism.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] Through the fully enclosed design of the closed cover of the present utility model, it ensures a slightly positive pressure inside. The feeding mechanism distributes the material evenly, and multi-point feeding can be selected. The vacuum disc adsorbs the filter belt through negative pressure to suck away the liquid of the material on the filter belt to obtain the catalyst. The cleaning mechanism can wash the catalyst and the filter belt after washing and filtering multiple times. The flow rate of the washing liquid can be adjusted, and the washing liquid is evenly distributed on the filter cake. An automatic deviation rectifying device is provided on the filter belt to detect the position of the filter belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the internal front view structure schematic diagram of the present utility model;

[0021] In the figure:

[0022] Filtering area 100, washing area 200, drying area 300, enclosure 1, vacuum tank 2, vacuum tray 3, driving cylinder 4, filter belt 5, vacuum switching valve 6, driving roller 7, transmission roller 8, cloth chute 9, spray pipe 11, catalyst washing nozzle 12, filter belt washing nozzle 13, scraper 14, tensioning cylinder 15, swinging bracket 16, tensioning roller 17, pneumatic guide 18, filter belt limit switch 19, filter cake collection mechanism 20. Detailed implementation

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment:

[0025] As Figure 1 shown, a catalyst separation and recovery device for producing epichlorohydrin by hydrogen peroxide oxidation of allyl chloride includes a frame, an enclosure 1 provided outside the frame, a vacuum chamber provided on the frame, a filter cloth mechanism provided on the outer peripheral side of the vacuum chamber, a cleaning mechanism provided on the filter cloth mechanism, a tensioning mechanism, and a deviation rectifying mechanism. A plurality of vacuum tanks 2 are connected in the vacuum chamber.

[0026] The vacuum chamber includes a vacuum tray 3 and a grid plate provided on the vacuum tray. A driving cylinder 4 is provided on one side of the vacuum tray 3 for pushing the vacuum tray 3 to reciprocate with the filter belt 5. The vacuum chamber is divided into a filtering area 100, a washing area 200, and a drying area 300. Vacuum tanks 2 are respectively connected to the vacuum trays 3 in the filtering area 100, the washing area 200, and the drying area 300 for recovering filtrate and washing liquid respectively. The vacuum tank 2 is an automatic liquid discharging container that can separate gas and liquid, discharge liquid without losing vacuum. The vacuum tank 2 is provided with a vacuum switching valve 6, including a vacuum valve and a vent valve, and the action directions of the two valves are opposite; it is used to control the pressure in the vacuum chamber to make the vacuum tray 3 intermittently adsorb the filter belt 5.

[0027] The filter cloth mechanism includes a driving roller 7 and a plurality of transmission rollers 8 provided around the vacuum chamber. The driving roller 7 and the transmission rollers 8 jointly support a filter belt 5. The filter belt 5 is ~250 mesh, made of materials such as PE, PP, and non-woven fabric, anti-static, and can be used normally in an allyl chloride environment. The driving roller 7 is provided with a motor and a reducer, and after deceleration, it drives the driving roller lined with acid and alkali resistant rubber on the outer layer to rotate. The reducer is a variable speed reducer, so that the running speed of the filter belt is adjustable.

[0028] The filter belt 5 advances by the frictional force between the driving roller 7 and the transmission roller 8. The vacuum chamber is surrounded by the filter belt 5 inside. When the inside of the vacuum chamber is under negative pressure, the filter belt 5 is adsorbed by the upper end of the vacuum chamber, and the liquid on the filter belt 5 is sucked away.

[0029] The closed cover 1 is provided with a feeding mechanism, which is arranged directly above the filtering area 100 of the vacuum chamber. The feeding mechanism includes a fish-tail type cloth trough 9. A number of guiding ribs are arranged in the cloth trough 9, and the discharge port of the cloth trough 9 is arranged above the filter belt 5. The cloth trough 9 can be set to feed at multiple places, so that the slurry is evenly distributed on the filter belt 5. The feeding mechanism is a common structure at present.

[0030] The cleaning mechanism includes a spray pipe 11 and nozzles arranged at the end of the spray pipe 11. The nozzles include a catalyst washing nozzle 12 and a filter belt washing nozzle 13. The catalyst washing nozzle 12 is located directly above the filtering area 100 of the vacuum chamber and is used for washing the catalyst. The filter belt washing nozzle 13 is located below the vacuum chamber and is used for spraying and washing the filter belt after removing the catalyst cake to ensure that the pores of the filter belt are normal. The washing liquid uses allyl chloride. There are multiple catalyst washing nozzles and filter belt washing nozzles to ensure complete flushing of the filter belt.

[0031] A filter cake stripping mechanism is arranged on one side of the driving roller 7. The filter cake stripping mechanism is a scraper 14, which is used for stripping the catalyst cake on the filter belt 5; when the filter belt 5 moves to the driving roller 7 while carrying the dried filter cake under the drag of the driving roller 7, due to the decrease in the radius of curvature, the filter cake automatically cracks, and the thin scraper strips the filter cake and discharges it. A filter cake collection mechanism 20 is arranged directly below the filter cake stripping mechanism. The filter cake collection mechanism 20 adopts a square-to-round structure, and the filter cake enters the collection tank through the filter cake collection mechanism 20.

[0032] The tensioning mechanism includes a tensioning cylinder 15 fixed to the frame, a swing bracket 16 arranged at the output end of the tensioning cylinder 15, and a tensioning roller 17 arranged on the swing bracket 16. The tensioning roller 17 is used for tensioning the filter belt 5.

[0033] The deviation correction device includes pneumatic guides 18 symmetrically arranged on both sides of the filter belt, which are used to prevent the filter belt from folding and wrinkling and correct the deviation of the filter belt.

[0034] A filter belt limit switch 19 is arranged on one side of the filter cloth mechanism.

[0035] The closed cover is provided with a slightly positive pressure interface, an oxygen content measurement interface, a nitrogen introduction interface and a multi-point washing liquid interface; nitrogen is introduced through the nitrogen introduction interface, and the purpose is to adjust the oxygen content in the sealed cover.

[0036] A control mechanism and an anti-static facility are arranged inside the sealed cover.

[0037] After the aqueous phase containing ~20% catalyst enters the filter, it is washed with allyl chloride to wash the liquid impurities in the filter cake, improving the purity of the solid components in the filter residue; the filter cake after being washed with allyl chloride enters the drying area for further drying, and a filter cake with a solid content of ~70% is obtained for recycling, and the liquid is recycled in separate zones, and the recycled liquid is discharged separately.

[0038] When performing solid-liquid two-phase separation of the slurry, the vacuum suction filtration method is adopted, that is, a vacuum is formed on one side of the filter medium, and the slurry to be separated is at normal pressure on the other side. Under the action of the pressure difference on both sides of the medium, the liquid flows through the medium to the vacuum side, and the solid (filter cake) is retained on the filter belt.

[0039] During the operation of the filter, the vacuum disc 3 adsorbs the filter belt and moves along with the horizontal filter belt under the push of the driving cylinder, and operations such as filtration, washing, drying, and discharging are carried out simultaneously. When the vacuum disc 3 moves to a certain position, the vacuum is removed and it quickly returns to the initial position. At this time, the filter cake on the filter belt is scraped off by the scraper, the filter belt continues to move forward, is washed by the filter belt washing nozzle and then fed again, and the vacuum disc 3 resumes the vacuum again, sucks up the washed filter belt and continues to move forward, and this cycle repeats.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A phase transfer catalyst separation and recovery device, comprising a frame, characterized in that: A closed cover is provided on the outside of the frame. It further includes a feeding mechanism provided on the closed cover, a vacuum chamber provided on the frame, a filter cloth mechanism provided on the outer peripheral side of the vacuum chamber, and a cleaning mechanism provided on the filter cloth mechanism. A number of vacuum tanks are connected inside the vacuum chamber; the filter cloth mechanism includes a driving roller and a number of transmission rollers provided around the vacuum chamber, and a filter belt is supported jointly on the driving roller and the transmission rollers; the feeding mechanism includes a fish-tail type cloth trough, and a number of guiding ribs are provided inside the cloth trough. The discharge port of the cloth trough is provided above the filter cloth mechanism; a cleaning mechanism is provided on the filter cloth mechanism, including a spray pipe and a nozzle provided at the end of the spray pipe. The nozzle includes a catalyst washing nozzle and a filter belt washing nozzle, and multiple groups of catalyst washing nozzles and filter belt washing nozzles are provided; the washing liquid of the catalyst washing nozzle and the filter belt washing nozzle is allyl chloride.

2. The phase transfer catalyst separation and recovery equipment according to claim 1, wherein: A tensioning mechanism is provided on the filter cloth mechanism, including a tensioning cylinder fixed to the frame, a swing bracket provided at the output end of the tensioning cylinder, and a tensioning roller provided on the swing bracket. The tensioning roller is used for tensioning the filter belt.

3. The phase transfer catalyst separation and recovery equipment according to claim 1, characterized in that: A filter cake peeling mechanism is provided on one side of the filter cloth mechanism. The filter cake peeling mechanism is a scraper for peeling the catalyst on the filter belt. A deviation rectifying mechanism is provided on the filter cloth mechanism. The deviation rectifying device includes pneumatic guides symmetrically provided on both sides of the filter belt to prevent the filter belt from folding and wrinkling and to correct the deviation of the filter belt.

4. The phase transfer catalyst separation and recovery equipment according to claim 1, characterized in that: The vacuum chamber includes a vacuum plate and a grid plate provided on the vacuum plate. A driving cylinder is provided on one side of the vacuum plate for pushing the vacuum plate to move reciprocally. The vacuum tank is provided with a vacuum switching valve, including a vacuum valve and a vent valve, and the action directions of the two valves are opposite. A filter belt limit switch is provided on one side of the filter cloth mechanism.

5. The phase transfer catalyst separation and recovery equipment according to claim 1, characterized in that: A variable frequency motor is provided on the driving roller. The variable frequency motor adjusts the rotational speed by changing the frequency of the motor, so that the running speed of the filter belt is adjustable.

6. The phase transfer catalyst separation and recovery device according to claim 1, wherein: The closed cover is provided with a slightly positive pressure interface, an oxygen content measurement interface, a nitrogen introduction interface, and a multi-point washing liquid interface. A control mechanism and an anti-static facility are provided inside the closed cover.

7. The phase transfer catalyst separation and recovery device according to claim 3, wherein: It further includes a filter cake collection mechanism provided directly below the filter cake peeling mechanism.

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