Catalyst recovery device and system for a full-mix reactor

Abstract

The application discloses a full-mixed reaction kettle catalyst recovery device and system, the recovery device comprises a density separation unit, which is communicated with the reaction kettle and is used for carrying out density difference separation on first reaction liquid containing catalyst output by the reaction kettle to obtain primary catalyst and second reaction liquid, and outputting the primary catalyst to the reaction kettle; a centrifugal separation unit is used for carrying out centrifugal separation on the second reaction liquid to obtain and output third reaction liquid, and outputting separated secondary catalyst to the reaction kettle; and a filtering separation unit is used for carrying out filtering separation on the third reaction liquid to obtain and output fourth reaction liquid, and outputting separated tertiary catalyst to the reaction kettle. By implementing the application, filtering load and catalyst abrasion in the recycling process are reduced, periodic parking for recycling is not needed, full separation and recycling of large, medium and small particle solid catalysts, and even slurry catalysts are realized, catalyst waste is avoided, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemical technology, and in particular to a full-mixing reaction kettle catalyst recovery device and system. BACKGROUND

[0002] A catalyst refers to a solid substance that can change the chemical reaction rate of reactants (increase or decrease) without changing the chemical equilibrium, and the mass and chemical properties of the catalyst do not change before and after the chemical reaction. Catalysts are widely used in hydrogenation, hydroformylation and other reaction processes.

[0003] Generally, in a fixed bed reactor, the catalyst is fixed in the form of large particles inside the reactor bed layer, and the material flows through the catalyst bed layer to react. The catalyst does not flow with the stream, and no additional catalyst separation means is needed. When the catalyst is used in a full-mixing reactor, the catalyst is often used in the form of small particles or even slurry. Fine catalyst particles can easily flow out of the reactor with the reaction liquid into the subsequent separation and refining system, affecting the separation and product refining effect, and causing a large amount of catalyst loss.

[0004] Currently, for a full-mixing solid catalyst reaction system, the existing catalyst recovery method mainly uses multi-stage filters and scrapers for separation and recovery. However, the existing catalyst recovery method has the following defects:

[0005] 1) The use of multi-stage filters for catalyst recovery not only results in a large increase in system pressure drop, but also requires regular backwashing of the filters to separate and recover the catalyst particles filtered from the filter layer.

[0006] 2) The use of scrapers for catalyst recovery requires the reaction liquid containing the catalyst to undergo a high-temperature evaporation stage, which can easily cause material deterioration and catalyst deactivation at high temperatures. SUMMARY

[0007] The present application aims to overcome the shortcomings of the prior art and provide a full-mixing reaction kettle catalyst recovery device and system.

[0008] The technical solution of the present application provides a full-mixing reaction kettle catalyst recovery device, comprising:

[0009] A density separation unit is in communication with the reaction kettle and is used to separate the first reaction liquid containing the catalyst output from the reaction kettle by density difference to obtain a first catalyst and a second reaction liquid, and output the first catalyst to the reaction kettle.

[0010] a centrifugal separation unit, an input end of the centrifugal separation unit being in communication with an output end of the density separation unit, a first output end of the centrifugal separation unit being in communication with the reaction kettle, for centrifugal separation of the second reaction liquid, to obtain and output a third reaction liquid, and output the separated secondary catalyst to the reaction kettle;

[0011] a filtration separation unit, a first input end of the filtration separation unit being in communication with a second output end of the centrifugal separation unit, a second input end of the filtration separation unit being in communication with a fresh feed pipe, a first output end of the filtration separation unit being in communication with the reaction kettle, for filtration separation of the third reaction liquid, to obtain and output a fourth reaction liquid, and output the separated tertiary catalyst to the reaction kettle.

[0012] In one of the optional technical solutions, the density separation unit comprises a catalyst settling tank, a settling feed pipe, a settling discharge pipe, and a first catalyst recovery pipe,

[0013] an input end of the settling feed pipe being in communication with the reaction kettle, an output end of the settling feed pipe being in communication with the catalyst settling tank, and the output end of the settling feed pipe extending to a bottom of the catalyst settling tank;

[0014] an input end of the settling discharge pipe being in communication with the catalyst settling tank, an output end of the settling discharge pipe being in communication with the centrifugal separation unit;

[0015] an input end of the first catalyst recovery pipe being in communication with the bottom of the catalyst settling tank, an output end of the first catalyst recovery pipe being in communication with the reaction kettle.

[0016] In one of the optional technical solutions, the centrifugal separation unit comprises a liquid level control tank, an overflow pipe, and a second catalyst recovery pipe, the second reaction liquid entering the liquid level control tank along an inner side wall of the liquid level control tank;

[0017] an input end of the overflow pipe being suspended inside the liquid level control tank, an output end of the overflow pipe being in communication with the filtration separation unit;

[0018] an input end of the second catalyst recovery pipe being in communication with the bottom of the liquid level control tank, an output end of the second catalyst recovery pipe being in communication with the reaction kettle.

[0019] In one of the optional technical solutions, the filtration separation unit comprises a first catalyst filter, a third reaction liquid feed pipe, a fourth reaction liquid discharge pipe, a third catalyst recovery pipe, and a fresh feed pipe for conveying fresh material, the fresh feed pipe and the fourth reaction liquid discharge pipe being in communication with the first catalyst filter;

[0020] The input end of the third reaction liquid feeding pipe is communicated with the centrifugal separation unit, and the output end of the third reaction liquid feeding pipe is communicated with the first catalyst filter;

[0021] The input end of the third catalyst recovery pipe is communicated with the bottom of the first catalyst filter, and the output end of the third catalyst recovery pipe is communicated with the reaction kettle.

[0022] In one of the optional technical solutions, the filter separation unit further comprises a second catalyst filter and a valve assembly, the valve assembly comprising a first reaction liquid inlet valve, a second reaction liquid inlet valve, a first fresh feed inlet valve, a second fresh feed inlet valve, a first fresh discharge outlet valve, a second fresh discharge outlet valve, a first reaction liquid outlet valve and a second reaction liquid outlet valve,

[0023] The third reaction liquid feeding pipe is communicated with the first catalyst filter through the first reaction liquid inlet valve, and the third reaction liquid feeding pipe is communicated with the second catalyst filter through the second reaction liquid inlet valve;

[0024] The fresh feed pipe is communicated with the first catalyst filter through the first fresh feed inlet valve, and the fresh feed pipe is communicated with the second catalyst filter through the second fresh feed inlet valve;

[0025] The first catalyst filter is communicated with the fourth reaction liquid discharge pipe through the first reaction liquid outlet valve, and the second catalyst filter is communicated with the fourth reaction liquid discharge pipe through the second reaction liquid outlet valve;

[0026] The bottom of the first catalyst filter is communicated with the third catalyst recovery pipe through the first fresh discharge outlet valve, and the bottom of the second catalyst filter is communicated with the third catalyst recovery pipe through the second fresh discharge outlet valve.

[0027] In one of the optional technical solutions, further comprising:

[0028] A controller for controlling the opening or closing of the valve assembly according to the received valve instructions.

[0029] In one of the optional technical solutions, further comprising:

[0030] A feed pressure detector for detecting the feed pressure of the third reaction liquid feeding pipe;

[0031] A discharge pressure detector for detecting the discharge pressure of the fourth reaction liquid discharge pipe;

[0032] The controller is further used for:

[0033] A pressure difference between the feed pressure and the discharge pressure is calculated, and if the pressure difference exceeds a preset pressure difference threshold, the opening or closing of the valve assembly is switched.

[0034] In one of the optional technical solutions, the system further comprises:

[0035] A pressure difference peak timer is configured to time when the pressure difference exceeds the preset pressure difference threshold, and generate a peak time.

[0036] The controller is further configured to:

[0037] The time interval between two adjacent peak times is calculated, and the power of the agitator of the reactor and the liquid level set value of the reactor are controlled according to the time interval.

[0038] In one of the optional technical solutions, the controller is further configured to:

[0039] If the time interval is less than a preset first time threshold, the power is increased.

[0040] If the time interval is greater than or equal to the preset first time threshold and less than a preset second time threshold, the liquid level set value is increased.

[0041] If the time interval is greater than a preset third time threshold and less than or equal to a preset fourth time threshold, the liquid level set value is decreased, and the preset third time threshold is greater than the preset second time threshold.

[0042] If the time interval is greater than the preset fourth time threshold, the power is decreased.

[0043] In one of the optional technical solutions, the system further comprises:

[0044] An equalizing pipe is in communication with the reactor, the density separation unit and the centrifugal separation unit, and is configured to keep the pressure of the reactor, the density separation unit and the centrifugal separation unit the same.

[0045] A catalyst recovery pump is configured to output the secondary catalyst and the tertiary catalyst to the reactor.

[0046] The technical solution of the present application further provides a full-mixing reactor system, which comprises a reactor and a full-mixing reactor catalyst recovery device as described above, and the reactor is in communication with the full-mixing reactor catalyst recovery device.

[0047] By adopting the technical scheme, the following beneficial effects are achieved: the first reaction liquid output by the reaction kettle is sequentially subjected to one-stage, two-stage and three-stage separation and recovery by the density separation unit, the centrifugal separation unit and the filtration separation unit, the filtration load and catalyst abrasion in the recycling process are reduced, periodic shutdown for recycling is not required, all of the large, medium and small particle solid catalysts, and even the slurry catalysts, are recycled, catalyst waste is avoided, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0048] The disclosure will become more readily understood by referring to the accompanying drawings in which:

[0049] Figure 1 a structure schematic view of the full-mixing type reaction kettle catalyst recycling device provided for the first embodiment of the present application;

[0050] Figure 2 a structure schematic view of the full-mixing type reaction kettle catalyst recycling device provided for the second embodiment of the present application;

[0051] Figure 3 a structure schematic view of the full-mixing type reaction kettle catalyst recycling device provided for the third embodiment of the present application;

[0052] Figure 4 a structure schematic view of the full-mixing type reaction kettle catalyst recycling device provided for the fourth embodiment of the present application.

[0053] Correspondence table of reference signs:

[0054] 10-full-mixing type reaction kettle catalyst recycling device; 11-density separation unit; 111-catalyst settling tank; 112-settling feed pipe; 113-settling discharge pipe; 114-first catalyst recovery pipe; 12-centrifugal separation unit; 121-liquid level control tank; 122-overflow pipe; 123-second catalyst recovery pipe; 13-filtration separation unit; 131-first catalyst filter; 132-fourth reaction liquid feed pipe; 1321-first reaction liquid inlet valve; 1322-second reaction liquid inlet valve; 133-fourth reaction liquid discharge pipe; 1331-first reaction liquid outlet valve; 1332-second reaction liquid outlet valve; 134-third catalyst recovery pipe; 1341-first fresh discharge outlet valve; 1342-second fresh discharge outlet valve; 135-fresh feed pipe; 1351-first fresh feed inlet valve; 1352-second fresh feed inlet valve; 136-second catalyst filter; 14-pressure equalization pipe; 15-catalyst recovery pump; 16-controller; 17-feed pressure detector; 18-discharge pressure detector; 19-pressure difference peak timer; 20-reaction kettle; 21-agitator. DETAILED DESCRIPTION

[0055] The specific embodiments of the present application will be further described in conjunction with the drawings.

[0056] It is easily understood that, according to the technical solutions of the present application, a person skilled in the art can replace various structural modes and implementation modes with each other without changing the spirit of the present application. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solutions of the present application, and should not be considered as the whole or as a limitation or restriction on the technical solutions of the present application.

[0057] In this specification, the orientation terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the structure shown in the drawings, which are relative concepts, so they can be changed accordingly according to different positions and different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0058] Example one

[0059] As shown in Figure 1 The full-mixing reaction kettle catalyst recovery device 10 provided by the embodiment one of the present application comprises:

[0060] The density separation unit 11 is communicated with the reaction kettle 20, and is used for separating the first reaction liquid containing catalyst output by the reaction kettle 20 according to the density difference, obtaining the first catalyst and the second reaction liquid, and outputting the first catalyst to the reaction kettle 20;

[0061] The centrifugal separation unit 12, the input end of the centrifugal separation unit 12 is communicated with the output end of the density separation unit, the first output end of the centrifugal separation unit is communicated with the reaction kettle 20, and is used for centrifugal separation of the second reaction liquid, obtaining and outputting the third reaction liquid, and outputting the separated second catalyst to the reaction kettle 20;

[0062] The filtering separation unit 13, the first input end of the filtering separation unit 13 is communicated with the second output end of the centrifugal separation unit 12, the second input end of the filtering separation unit 13 is communicated with the fresh feed pipe 135, the first output end of the filtering separation unit 113 is communicated with the reaction kettle 20, and is used for filtering separation of the third reaction liquid, obtaining and outputting the fourth reaction liquid, and outputting the separated third catalyst to the reaction kettle 20.

[0063] The full-mixing reaction kettle catalyst recovery device provided by the embodiment mainly comprises the density separation unit 11, the centrifugal separation unit 12 and the filtering separation unit 13.

[0064] The density separation unit 11 is used for density difference separation of the first reaction liquid containing catalyst (including large, medium and small particle solid catalysts, and possibly slurry catalyst) output by the reaction kettle 20. Since the density of the large particle catalyst is greater than the density of the reaction liquid, after the first reaction liquid enters the density separation unit 11, the catalyst with large density is separated from the first reaction liquid, obtaining the primary catalyst (large particle solid catalyst) and the second reaction liquid (at this time, the second reaction liquid contains medium and small particle solid catalysts, and possibly slurry catalyst), and the density separation unit 11 outputs the primary catalyst to the reaction kettle 20 for reuse of the reaction kettle 20, realizing separation and recovery of the primary catalyst. At the same time, the density separation unit 11 outputs the second reaction liquid to the centrifugal separation unit 12.

[0065] After the second reaction liquid enters the centrifugal separation unit 12, the secondary catalyst (medium particle solid catalyst) is separated by centrifugal force, obtaining the third reaction liquid (at this time, the third reaction liquid contains small particle solid catalyst, and possibly slurry catalyst), and the centrifugal separation unit 12 outputs the secondary catalyst to the reaction kettle 20 for reuse of the reaction kettle 20, realizing separation and recovery of the secondary catalyst. At the same time, the centrifugal separation unit 12 outputs the third reaction liquid to the filtration separation unit 13.

[0066] After the third reaction liquid enters the filtration separation unit 13, the tertiary catalyst (small particle catalyst and slurry catalyst (if present)) is separated by filtration, obtaining the fourth reaction liquid, and the filtration separation unit 13 reversely blows the tertiary catalyst into the reaction kettle 20 by the fresh material input through the fresh feed pipe, for reuse of the reaction kettle 20, realizing separation and recovery of the tertiary catalyst. At the same time, the filtration separation unit 13 outputs the fourth reaction liquid to the downstream unit.

[0067] In this embodiment, the first reaction liquid output by the reaction kettle is sequentially separated and recovered in primary, secondary and tertiary stages by the density separation unit, the centrifugal separation unit and the filtration separation unit, reducing the filtration load and catalyst abrasion in the recovery and utilization process, and without periodic shutdown for recovery, realizing full separation and recovery of large, medium and small particle solid catalysts, and even slurry catalyst, avoiding waste of catalyst and reducing cost.

[0068] Example Two

[0069] On the basis of the above-mentioned example one, as Figure 2As shown, the full-mixing reaction kettle catalyst recovery device 10 provided by the second embodiment of the present application comprises a catalyst settling tank 111, a liquid level control tank 121, a first catalyst filter 131, a settling feed pipe 112, a settling discharge pipe 113, a first catalyst recovery pipe 114, an overflow pipe 122, a second catalyst recovery pipe 123, a third reaction liquid feed pipe 132, a fourth reaction liquid discharge pipe 133, a third catalyst recovery pipe 134, and a fresh feed pipe 135 for conveying fresh materials,

[0070] The input end of the settling feed pipe 112 is in communication with the reaction kettle 20, the output end of the settling feed pipe 112 is in communication with the catalyst settling tank 111, and the output end of the settling feed pipe 112 extends to the bottom of the catalyst settling tank 111;

[0071] The input end of the settling discharge pipe 113 is in communication with the catalyst settling tank 111, and the output end of the settling discharge pipe 113 is in communication with the centrifugal separation unit 12;

[0072] The input end of the first catalyst recovery pipe 114 is in communication with the bottom of the catalyst settling tank 111, and the output end of the first catalyst recovery pipe 114 is in communication with the reaction kettle 20;

[0073] The input end of the overflow pipe 122 is suspended in the interior of the liquid level control tank 121, and the output end of the overflow pipe 122 is in communication with the filter separation unit 13;

[0074] The input end of the second catalyst recovery pipe 123 is in communication with the bottom of the liquid level control tank 121, and the output end of the second catalyst recovery pipe 123 is in communication with the reaction kettle 20;

[0075] The input end of the third reaction liquid feed pipe 132 is in communication with the centrifugal separation unit 12, and the output end of the third reaction liquid feed pipe 132 is in communication with the first catalyst filter 131;

[0076] The input end of the third catalyst recovery pipe 134 is in communication with the bottom of the first catalyst filter 131, and the output end of the third catalyst recovery pipe 134 is in communication with the reaction kettle 20;

[0077] The fresh feed pipe 135 and the fourth reaction liquid discharge pipe 133 are in communication with the first catalyst filter 131.

[0078] The catalyst settling tank 111 is in communication with the reaction kettle 20 through the settling feed pipe 112, the catalyst settling tank 111 is in communication with the liquid level control tank 121 through the settling discharge pipe 113, the liquid level control tank 121 is in communication with the first catalyst filter 131 through the overflow pipe 122 and the third reaction liquid feed pipe 132.

[0079] The catalyst settling tank 111 is used for density difference separation of the first reaction liquid, to obtain primary catalyst and second reaction liquid, and the primary catalyst enters the reaction kettle 20 through the first catalyst recovery pipe 114 for recycling. The second reaction liquid enters the liquid level control tank 121 from the tangent direction of the cylinder of the liquid level control tank 121 through the settling discharge pipe 113, and the second reaction liquid generates cyclone along the inner side wall of the liquid level control tank 121. The liquid level control tank 121 performs centrifugal separation on the second reaction liquid through the centrifugal force generated by the cyclone, to obtain secondary catalyst and third reaction liquid, and the secondary catalyst enters the reaction kettle 20 through the second catalyst recovery pipe 123 for recycling.

[0080] The third reaction liquid enters the first catalyst filter 131 through the overflow pipe 122 and the third reaction liquid feeding pipe 132. The first catalyst filter 131 filters the third reaction liquid to obtain tertiary catalyst and fourth reaction liquid, and the tertiary catalyst enters the reaction kettle 20 through the third catalyst recovery pipe 134 for recycling, and the fourth reaction liquid is discharged through the fourth reaction liquid discharge pipe 133 and transported to a downstream unit, so as to realize separation and recycling of the tertiary catalyst.

[0081] Preferably, the bottom of the catalyst settling tank 111 is located at a higher level than the bottom of the reaction kettle 20, so that the settling discharge pipe 113 is sloped towards the reaction kettle 20, to accelerate the recycling speed of the primary catalyst.

[0082] Preferably, the bottoms of the catalyst settling tank 111 and the liquid level control tank 121 are in the shape of an inverted cone, to facilitate rapid separation and recycling of the primary catalyst and the secondary catalyst.

[0083] Preferably, the input end of the overflow pipe 122 is located at the center of the liquid level control tank 121 in the vertical direction, to further improve the separation effect of the secondary catalyst.

[0084] In this embodiment, the first reaction liquid output by the reaction kettle is sequentially separated and recycled in primary, secondary and tertiary stages through the density separation unit, the centrifugal separation unit and the filtering separation unit, to reduce the filtering load and catalyst abrasion in the recycling process, and to realize complete separation and recycling of large, medium and small particle solid catalysts, even slurry catalysts, to avoid waste of catalysts and reduce costs.

[0085] In one of the optional embodiments, the device further comprises:

[0086] The pressure equalizing pipe 14 is in communication with the reaction kettle 20, the density separation unit 11 and the centrifugal separation unit 12, respectively, to keep the pressure of the reaction kettle 20, the density separation unit 11 and the centrifugal separation unit 12 the same;

[0087] A catalyst recovery pump 15 is used to output the secondary catalyst and the tertiary catalyst to the reaction kettle 20.

[0088] The pressure equalizing pipes 14 are respectively in communication with the gas phase spaces of the reaction kettle 20, the catalyst settling tank 111 and the liquid level control tank 121, so as to keep the pressure in the reaction kettle 20, the catalyst settling tank 111 and the liquid level control tank 121 consistent, thereby ensuring that the reaction liquid can normally overflow from the reaction kettle 20 to the catalyst settling tank 111 and then overflow from the catalyst settling tank 111 to the liquid level control tank 121 by the driving force of the feed. It should be noted that other ways can also be used to keep the pressure in the reaction kettle 20, the density separation unit 11 and the centrifugal separation unit 12 the same, and are not limited to the embodiment.

[0089] The input ends of the catalyst recovery pump 15 are respectively in communication with the second catalyst recovery pipe 123 and the third catalyst recovery pipe 134, and the output end of the catalyst recovery pump 15 is in communication with the reaction kettle 20, so as to realize the rapid output of the secondary catalyst and the tertiary catalyst to the reaction kettle 20 and improve the efficiency.

[0090] Embodiment Three

[0091] On the basis of the above-mentioned embodiment two, the same parts as in embodiment two will not be described again, such as Figure 3 As shown in the figure, the catalyst recovery device for a full-mixing type reaction kettle provided by the embodiment three of the present application further comprises a second catalyst filter 136 and a valve assembly, the valve assembly comprises a first reaction liquid inlet valve 1321, a second reaction liquid inlet valve 1322, a first fresh feed inlet valve 1351, a second fresh feed inlet valve 1352, a first fresh feed outlet valve 1341, a second fresh feed outlet valve 1342, a first reaction liquid outlet valve 1331 and a second reaction liquid outlet valve 1332,

[0092] The third reaction liquid feed pipe 132 is in communication with the first catalyst filter 131 through the first reaction liquid inlet valve 1321, and the third reaction liquid feed pipe 132 is in communication with the second catalyst filter 136 through the second reaction liquid inlet valve 1322;

[0093] The fresh feed pipe 135 is in communication with the first catalyst filter 131 through the first fresh feed inlet valve 1351, and the fresh feed pipe 135 is in communication with the second catalyst filter 136 through the second fresh feed inlet valve 1352;

[0094] The first catalyst filter 131 is in communication with the fourth reaction liquid discharge pipe 133 through the first reaction liquid outlet valve 1331, and the second catalyst filter 136 is in communication with the fourth reaction liquid discharge pipe 133 through the second reaction liquid outlet valve 1332;

[0095] The bottom of the first catalyst filter 131 is communicated with the third catalyst recovery pipe 134 through the first fresh discharge outlet valve 1341, and the bottom of the second catalyst filter 136 is communicated with the third catalyst recovery pipe 134 through the second fresh discharge outlet valve 1342.

[0096] In use, only one of the first catalyst filter 131 and the second catalyst filter 136 can be in use state at the same time, and the other is in standby state. When the first catalyst filter 131 is in use state and the second catalyst filter 136 is in standby state, the first reaction liquid inlet valve 1321, the first reaction liquid outlet valve 1331 and the second fresh feed inlet valve 1352 are controlled to be opened, and the first fresh feed inlet valve 1351, the second reaction liquid inlet valve 1322 and the second reaction liquid outlet valve 1332 are controlled to be closed, which are in the opened state. At this time, the fresh material input through the fresh feed pipe 135 enters the second catalyst filter 136 in reverse through the first fresh feed inlet valve 1351, and the tertiary catalyst filtered out when the second catalyst filter 136 is in use state is flushed out in reverse, and the tertiary catalyst and the fresh material enter the catalyst recovery pump 15 through the second fresh discharge outlet valve 1342 and the third catalyst recovery pipe 134, and then are sent back to the reaction kettle 20 by the catalyst recovery pump 15, and the fresh material is reacted by the catalyst. The first reaction liquid carrying the catalyst enters the catalyst settling tank 112 through the settling feed pipe 112, the flow rate of the second reaction liquid in the upper part of the catalyst settling tank 111 is reduced, the primary catalyst is gradually settled to the bottom of the catalyst settling tank 111 due to its large density, and returns to the reaction kettle 20 under the action of negative pressure generated by the operation of the reaction kettle 20. The second reaction liquid overflows to the liquid level control tank 121 through the settling discharge pipe 113, the outlet of the settling discharge pipe 113 enters the liquid level control tank 121 from the tangent line of the cylinder of the liquid level control tank 121, and the second reaction liquid entering the liquid level control tank 121 forms a cyclone motion inside the liquid level control tank 121, the secondary catalyst particles in the second reaction liquid gradually fall along the inner wall of the liquid level control tank 121 to the bottom of the liquid level control tank 121 under the action of centrifugal force, and then enter the inlet of the catalyst recovery pump 15 through the second catalyst recovery pipe 123, and finally are sent back to the reaction kettle 20 by the catalyst recovery pump 15. The third reaction liquid with low catalyst content in the center of the cyclone in the liquid level control tank 121 enters the first catalyst filter 131 in use state in the forward direction through the first reaction liquid inlet valve 1321 and the third reaction liquid feed pipe 132 through the overflow pipe 122, filters out a small amount of tertiary catalyst remaining in the third reaction liquid, and the fourth reaction liquid completely free of catalyst enters the fourth reaction liquid discharge pipe 133 after the first reaction liquid outlet valve 1331 to be sent to the downstream unit.

[0097] Similarly, when the second catalyst filter 136 is in use and the first catalyst filter 131 is in standby, the valve assembly and the working principles of the second catalyst filter 136 and the first catalyst filter 131 are opposite to those when the first catalyst filter 131 is in use and the second catalyst filter 136 is in standby, and the remaining working principles are the same as those when the first catalyst filter 131 is in use and the second catalyst filter 136 is in standby, which will not be described here.

[0098] In the embodiment, the first catalyst filter, the second catalyst filter and the valve assembly are used to realize one-use and one-backup of the catalyst filter, avoid failure of one of the catalyst filters to perform three-stage catalyst filtration, and improve stability.

[0099] In one of the embodiments, the device further comprises:

[0100] The controller 16 is configured to control opening or closing of the valve assembly according to the received valve instruction.

[0101] The valve instruction can be generated according to user operation or other requirements, and the controller 16 controls opening or closing of the valve assembly according to the valve instruction to realize automatic switching of the first catalyst filter 131 and the second catalyst filter 136 and improve separation and recovery efficiency.

[0102] Embodiment Four

[0103] On the basis of the above-described embodiment three, the same parts as those in embodiment three will not be described here again, and as shown in Figure 4 The full-mixing reaction kettle catalyst recovery device provided by the embodiment four of the application further comprises:

[0104] The feed pressure detector 17 is configured to detect a feed pressure of the third reaction liquid feed pipe 132.

[0105] The discharge pressure detector 18 is configured to detect a discharge pressure of the fourth reaction liquid discharge pipe 133.

[0106] The controller 16 is further configured to:

[0107] Calculate a pressure difference between the feed pressure and the discharge pressure, and switch opening or closing of the valve assembly if the pressure difference exceeds a preset pressure difference threshold.

[0108] The feed pressure detector 17 detects the feed pressure of the third reaction liquid feed pipe 132 in real time and sends the feed pressure to the controller 16. The discharge pressure detector 18 detects the discharge pressure of the fourth reaction liquid discharge pipe 133 in real time and sends the discharge pressure to the controller 16. After receiving the feed pressure and the discharge pressure, the controller 16 calculates the pressure difference between the feed pressure and the discharge pressure, and determines whether the pressure difference exceeds the preset pressure difference threshold. If so, the controller 16 sends a valve switching signal to the valve assembly to switch the opening or closing of the valve assembly, i.e., to control the closing or opening of the valve assembly in the active state and the opening or closing of the valve assembly in the standby state.

[0109] Preferably, the feed pressure detector 17 and the discharge pressure detector 18 are pressure sensors.

[0110] In this embodiment, the feed pressure of the third reaction liquid feed pipe and the discharge pressure of the fourth reaction liquid discharge pipe are detected in real time, and the pressure difference between the feed pressure and the discharge pressure is calculated. The use state of the first catalyst filter and the second catalyst filter is periodically and automatically switched according to the pressure difference, thereby improving the separation and recovery efficiency.

[0111] In one of the optional embodiments, in order to avoid the decrease of selectivity caused by the long residence time of the reaction liquid in the reaction system, the reaction system further comprises:

[0112] The pressure difference peak timer 19 is configured to time when the pressure difference exceeds the preset pressure difference threshold and generate a peak time.

[0113] The controller 16 is further configured to:

[0114] The controller 16 is further configured to:

[0115] In one of the optional embodiments, the controller 16 is further configured to:

[0116] If the time interval is less than the preset first time threshold, the power is increased.

[0117] If the time interval is greater than or equal to the preset first time threshold and less than the preset second time threshold, the liquid level set value is increased.

[0118] If the time interval is greater than the preset third time threshold and less than or equal to the preset fourth time threshold, the liquid level set value is decreased, and the preset third time threshold is greater than the preset second time threshold.

[0119] If the time interval is greater than the preset fourth time threshold, the power is decreased.

[0120] The controller 16 judges whether the time interval is less than a preset first time threshold value, and if yes, increases the power of the stirrer 21, otherwise increases the liquid level setting value of the reactor 20; or the controller 16 judges whether the time interval is greater than a preset third time threshold value and less than or equal to a preset fourth time threshold value, and if yes, decreases the liquid level setting value, otherwise decreases the power, so as to periodically control the power of the stirrer 21 and the liquid level of the reactor 20, and avoid the reaction liquid to stay in the reaction system for too long time and reduce the selectivity.

[0121] Preferably, the preset first time threshold value is set as 80% of the preset second time threshold value, and the preset fourth time threshold value is set as 120% of the preset third time threshold value.

[0122] The embodiment of the present application also provides a full-mixing type reactor system, which comprises a reactor and a full-mixing type reactor catalyst recovery device as described above, and the reactor is communicated with the full-mixing type reactor catalyst recovery device.

[0123] In the embodiment, the first reaction liquid output by the reactor is sequentially separated and recovered in the first, second and third stages by the full-mixing type reactor catalyst recovery device, so as to reduce the filtering load and catalyst abrasion in the recycling process, and the periodic shutdown for recycling is not needed, the large, medium and small particle solid catalysts, even the slurry catalysts, can be fully separated and recycled, the waste catalysts are avoided, and the cost is reduced.

[0124] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, but not limit the same; although the embodiments of the present application are described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by the equivalent ones; and the modification or replacement does not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A catalyst recovery device for a fully mixed reactor, characterized in that, include: A density separation unit, connected to the reactor, is used to separate the first reaction liquid containing the catalyst output from the reactor by density difference to obtain a primary catalyst and a second reaction liquid, and output the primary catalyst to the reactor. A centrifugal separation unit, wherein the input end of the centrifugal separation unit is connected to the output end of the density separation unit, and the first output end of the centrifugal separation unit is connected to the reaction vessel, is used to centrifuge the second reaction liquid to obtain and output the third reaction liquid, and output the separated secondary catalyst to the reaction vessel; A filtration and separation unit is provided, wherein the first input end of the filtration and separation unit is connected to the second output end of the centrifugal separation unit, the second input end of the filtration and separation unit is connected to a fresh feed pipe, and the first output end of the filtration and separation unit is connected to the reactor. This unit is used to filter and separate the third reaction liquid to obtain and output a fourth reaction liquid, and to output the separated tertiary catalyst to the reactor. The filtration and separation unit includes a first catalyst filter, a third reaction liquid feed pipe, a fourth reaction liquid discharge pipe, a third catalyst recovery pipe, and a fresh feed pipe for conveying fresh materials. The fresh feed pipe and the fourth reaction liquid discharge pipe are connected to the first catalyst filter. The input end of the third reaction liquid feed pipe is connected to the centrifugal separation unit, and the output end of the third reaction liquid feed pipe is connected to the first catalyst filter. The input end of the third catalyst recovery pipe is connected to the bottom of the first catalyst filter, and the output end of the third catalyst recovery pipe is connected to the reactor. The filtration and separation unit further includes a second catalyst filter and a valve assembly. The valve assembly includes a first reaction liquid inlet valve, a second reaction liquid inlet valve, a first fresh feed inlet valve, a second fresh feed inlet valve, a first fresh discharge outlet valve, a second fresh discharge outlet valve, a first reaction liquid outlet valve, and a second reaction liquid outlet valve. The third reaction liquid feed pipe is connected to the first catalyst filter through the first reaction liquid inlet valve, and the third reaction liquid feed pipe is connected to the second catalyst filter through the second reaction liquid inlet valve. The fresh feed pipe is connected to the first catalyst filter through the first fresh feed inlet valve, and the fresh feed pipe is connected to the second catalyst filter through the second fresh feed inlet valve. The first catalyst filter is connected to the fourth reaction liquid discharge pipe through the first reaction liquid outlet valve, and the second catalyst filter is connected to the fourth reaction liquid discharge pipe through the second reaction liquid outlet valve. The bottom of the first catalyst filter is connected to the third catalyst recovery pipe through the first fresh discharge outlet valve, and the bottom of the second catalyst filter is connected to the third catalyst recovery pipe through the second fresh discharge outlet valve. A feed pressure detector is used to detect the feed pressure of the third reaction liquid feed pipe; A discharge pressure detector is used to detect the discharge pressure of the fourth reaction liquid discharge pipe; The controller is used to control the opening or closing of the valve assembly according to the received valve command: calculate the pressure difference between the feed pressure and the discharge pressure, and if the pressure difference exceeds a preset pressure difference threshold, switch the opening or closing of the valve assembly; A differential pressure peak timer is used to time the pressure difference when it exceeds the preset differential pressure threshold and generate the peak time. The controller is also used for: The time interval between two adjacent peak times is calculated, and the power of the stirrer and the liquid level setting of the reactor are controlled according to the time interval.

2. The catalyst recovery device for a fully mixed reactor as described in claim 1, characterized in that, The density separation unit includes a catalyst settling tank, a settling feed pipe, a settling discharge pipe, and a first catalyst recovery pipe. The input end of the settling feed pipe is connected to the reactor, the output end of the settling feed pipe is connected to the catalyst settling tank, and the output end of the settling feed pipe extends to the bottom of the catalyst settling tank. The input end of the settling discharge pipe is connected to the catalyst settling tank, and the output end of the settling discharge pipe is connected to the centrifugal separation unit. The input end of the first catalyst recovery pipe is connected to the bottom of the catalyst settling tank, and the output end of the first catalyst recovery pipe is connected to the reaction vessel.

3. The catalyst recovery device for a fully mixed reactor as described in claim 1 or 2, characterized in that, The centrifugal separation unit includes a liquid level control tank, an overflow pipe, and a second catalyst recovery pipe. The second reaction liquid enters the liquid level control tank along the inner wall of the liquid level control tank. The inlet of the overflow pipe is suspended inside the liquid level control tank, and the outlet of the overflow pipe is connected to the filtration and separation unit. The input end of the second catalyst recovery pipe is connected to the bottom of the liquid level control tank, and the output end of the second catalyst recovery pipe is connected to the reaction vessel.

4. The catalyst recovery device for a fully mixed reactor as described in claim 1, characterized in that, The controller is also used for: If the time interval is less than a preset first time threshold, increase the power. If the time interval is greater than or equal to the preset first time threshold and less than the preset second time threshold, the liquid level setting value is increased; If the time interval is greater than a preset third time threshold and less than or equal to a preset fourth time threshold, the liquid level setting value is reduced, wherein the preset third time threshold is greater than the preset second time threshold. If the time interval is greater than the preset fourth time threshold, the power is reduced.

5. The catalyst recovery device for a fully mixed reactor as described in claim 1, characterized in that, Also includes: A pressure equalization pipe is connected to the reaction vessel, the density separation unit, and the centrifugal separation unit respectively, and is used to maintain the same pressure in the reaction vessel, the density separation unit, and the centrifugal separation unit; A catalyst recovery pump is used to output the secondary catalyst and the tertiary catalyst to the reactor.

6. A fully mixed reaction vessel system, characterized in that, It includes a reaction vessel and a fully mixed reaction vessel catalyst recovery device as described in any one of claims 1-5, wherein the reaction vessel is connected to the fully mixed reaction vessel catalyst recovery device.

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