A liquid catalyst dosing system for mixed cresol alkylation reaction

Abstract

The application discloses a kind of for mixed cresol alkylation reaction liquid catalyst quantitative addition system, including catalyst storage tank, catalyst adding mechanism and reaction kettle, the catalyst adding mechanism includes catalyst dropping jar;The bottom end of the catalyst dropping jar is fixed with vertical sleeve and first air cylinder, and the inside of catalyst dropping jar is installed with piston, and the output shaft of first air cylinder extends into catalyst dropping jar and is fixed with the bottom end of piston.The catalyst in catalyst storage tank is pumped into the first catalyst dropping jar by liquid pump through material adding pipe, swivel joint and cross pipe, when three catalyst dropping jars are full, it flows back to the catalyst storage tank by overflow return pipe, without waste of catalyst, and three catalyst dropping jars can be filled at one time, with high efficiency, and three catalyst dropping jars can be added to the reaction kettle in turn after filling at one time, which can be used three times, further improving the catalyst adding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of chemical production, in particular to a quantitative addition system for a liquid catalyst used in a mixed cresol alkylation reaction. Background Art

[0002] A catalyst generally refers to a substance that increases the reaction rate without changing the overall standard Gibbs free energy of the reaction. It can also be described as a substance that increases the reaction rate without altering the chemical equilibrium, and whose mass and chemical properties remain unchanged before and after the reaction. According to statistics, catalysts are used in over 90% of industrial processes, including those in the chemical, petrochemical, biochemical, and environmental protection industries.

[0003] There are many types of catalysts. They can be divided into liquid catalysts and solid catalysts based on their state; and into homogeneous catalysts and heterogeneous catalysts based on the phase of the reaction system. Homogeneous catalysts include acids, bases, soluble transition metal compounds, and peroxide catalysts. Catalysts play an extremely important role in the modern chemical industry. For example, iron catalysts are used in the production of synthetic ammonia, vanadium catalysts are used in the production of sulfuric acid, and different catalysts are used in the polymerization of ethylene and the production of rubber from butadiene, three major synthetic materials.

[0004] During the alkylation of tricresols (a mixture of o-cresol, m-cresol, and p-cresol isomers) in chemical production, sulfuric acid catalyst needs to be added. The existing technology mainly uses manual sulfuric acid addition. Due to the strong corrosiveness of sulfuric acid, manual sulfuric acid addition poses a great safety risk. If the operator makes a mistake, the labor intensity is high and the addition efficiency is low. Summary of the Invention

[0005] In order to solve the problems mentioned in the above background technology, the present invention provides a system for quantitatively adding a liquid catalyst for a mixed cresol alkylation reaction.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A quantitative addition system for liquid catalyst in mixed cresol alkylation reaction, comprising a catalyst storage tank, a catalyst addition mechanism and a reactor, wherein the catalyst addition mechanism comprises a catalyst dropping tank;

[0008] A vertical sleeve and a first cylinder are fixed to the bottom end of the catalyst dropping tank, a piston is installed inside the catalyst dropping tank, an output shaft of the first cylinder extends into the catalyst dropping tank and is fixed to the bottom end of the piston, a discharge cannula is installed on the piston, and the bottom end of the discharge cannula is movably extended into the vertical sleeve;

[0009] The bottom end of the vertical sleeve extends to the outside of the catalyst dripping tank and is fixed with a first connector. The catalyst adding mechanism also includes a second cylinder, and the output end of the second cylinder is fixed with a second connector. The first connector and the second connector match each other, and the second connector is connected to the reactor through a hose.

[0010] Preferably, two vertical sliding rods are slidably installed in the first connecting head, the top ends of the vertical sliding rods are connected to springs, and the bottom end brackets of the two vertical sliding rods are fixed with first extrusion rings.

[0011] Preferably, a blocking plate is provided in the first connector, a fan-shaped leakage hole is opened on the blocking plate, a vertical shaft is rotatably mounted on the top of the blocking plate, the fan-shaped blocking plate is fixed on the vertical shaft through a connecting rod, and the fan-shaped blocking plate corresponds to the fan-shaped leakage hole.

[0012] Preferably, a guide column is fixed to the top of the vertical axis, a spiral guide groove is opened on the outside of the guide column, a horizontal plug rod is fixed on the vertical sliding rod, and the horizontal plug rod extends from one end of the vertical sliding rod to the spiral guide groove.

[0013] Preferably, a second extrusion ring is fixed inside the second connector, the second extrusion ring has the same diameter as the first extrusion ring and corresponds to each other, and a rubber sealing gasket is installed on the outside of the second connector.

[0014] Preferably, the catalyst adding mechanism also includes a base, a guide column is rotatably installed on the top of the base, a guide rail is fixed on the outside of the guide column, the guide rail extends spirally, and a groove is provided on the side of the guide rail away from the guide column. A lifting mechanism is also fixed on the top of the base, and the output end of the lifting mechanism is connected to a cross bar, and the end of the cross bar away from the lifting mechanism extends into the groove. Three catalyst dripping tanks are fixed to the top of the guide column through a bracket, and a vertical pipe is fixed to the top of the bracket. A rotary joint is installed on the top of the vertical pipe, and a material adding pipe is connected between the rotary joint and the catalyst storage tank. A horizontal pipe is connected to one side of the vertical pipe, and the horizontal pipe is connected to one of the catalyst dripping tanks.

[0015] Preferably, the three catalyst dropping tanks are connected at their ends with intermediate overflow pipes, the last catalyst dropping tank is connected with an overflow return pipe, and the overflow return pipe is communicated with the catalyst storage tank.

[0016] Preferably, the lifting mechanism includes a fixing frame, on which a threaded rod and a guide rod are respectively installed. The fixing frame is also provided with a lifting plate, on which a threaded sleeve is installed. The threaded sleeve is threadedly installed on the outside of the threaded rod, and the guide rod passes through the lifting plate through a guide hole.

[0017] Preferably, a rotary motor is installed at the top of the lifting mechanism, which drives the threaded rod to rotate, and the lifting plate is fixed to the cross bar, and a guide roller is rotatably installed on the side of the cross bar away from the lifting plate.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. The catalyst in the catalyst storage tank is pumped into the first catalyst dropping tank through the material adding pipe, the rotary joint and the cross pipe, then when the first catalyst dropping tank is full, it enters the next catalyst dropping tank through the intermediate overflow pipe, and when the three catalyst dropping tanks are full, it returns to the catalyst storage tank through the overflow return pipe, without waste of catalyst, and the three catalyst dropping tanks can be filled at one time, with high efficiency, and after being filled at one time, the three catalyst dropping tanks can be added to the reaction kettle in turn, which can be used three times, further improving the catalyst adding efficiency.

[0020] 2. The horizontal rod can be vertically lifted and moved by the lifting mechanism, and when the horizontal rod is lifted and moved, the guide column can be rotated relative to the base, so that the three catalyst dropping tanks can be rotated, the guide rails extend in a spiral shape, and there is a vertical part between the guide rails, when the horizontal rod moves in the vertical part of the guide rail, the guide column remains stationary, so that each catalyst dropping tank can be brought to the specified position in turn, and then the catalyst is added to the reaction kettle.

[0021] 3. The lifting plate can be lifted and moved by driving the threaded rod to rotate by the rotary motor, which can drive the horizontal rod to vertically slide in the groove to drive the guide column to rotate, and the presence of the guide roller can reduce the friction between the horizontal rod and the inner wall of the groove.

[0022] 4. The first cylinder can push the piston to move up and down, so as to change the volume of the upper part of the piston in the catalyst dropping tank, so as to change the amount of catalyst that can be stored in the catalyst dropping tank, which can be adjusted according to actual needs, so as to conveniently measure different volumes of catalyst, and the use is more convenient. The first connecting head and the second connecting head can be engaged by the second cylinder, so as to add the catalyst stored in the catalyst dropping tank to the reaction kettle.

[0023] 5. By the design of the first connecting head and the second connecting head, when the second connecting head and the first connecting head are completely abutted together, the fan-shaped plugging plate and the fan-shaped leakage hole can be completely staggered, so as to ensure that when the second connecting head and the first connecting head are completely abutted together, the catalyst can automatically flow out of the first connecting head, without the need to add a valve, and the use is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0025] Figure 1 Flow chart of the present application;

[0026] Figure 2 Enlarged detail view of the catalyst adding mechanism of the present application;

[0027] Figure 3 Enlarged detail view of the horizontal bar position in the catalyst adding mechanism of the present application;

[0028] Figure 4 Enlarged detail view of the lifting mechanism of the present application;

[0029] Figure 5 Top view of the guide column of the present application;

[0030] Figure 6 Enlarged sectional view of the catalyst dropping tank of the present application;

[0031] Figure 7 Perspective view of the present application;

[0032] Figure 8 Perspective sectional view of the first connector and the second connector in the disengaged state at the connecting position of the present application;

[0033] Figure 9 Perspective sectional view of the first connector and the second connector in the engaged state at the connecting position of the present application;

[0034] Figure 10 Sectional view of the first connector and the second connector in the disengaged state of the present application;

[0035] Figure 11 Sectional view of the first connector and the second connector in the engaged state of the present application.

[0036] In the figure: 1 catalyst storage tank, 2 catalyst adding mechanism, 3 guide column, 301 guide rail, 3011 groove, 4 support, 5 catalyst drop tank, 501 intermediate overflow pipe, 502 overflow return pipe, 6 vertical pipe, 601 horizontal pipe, 602 rotary joint, 603 material adding pipe, 7 base, 8 lifting mechanism, 801 guide rod, 802 threaded rod, 803 lifting plate, 8031 threaded sleeve, 804 rotary motor, 9 crossbar, 901 guide roller, 10 first cylinder, 11 piston, 12 vertical sleeve, 1201 blocking plate, 1202 fan-shaped leakage hole, 1203 vertical shaft, 1204 guide column, 1205 spiral guide groove, 1206 connecting rod, 1207 fan-shaped blocking plate, 1208 second extrusion ring, 1401 rubber sealing ring, 13 first connector, 14 second connector, 15 second cylinder, 16 hose, 17 discharge cannula, 18 vertical sliding rod, 1801 spring, 1802 first extrusion ring, 1803 horizontal insertion rod, 19 reaction kettle. DETAILED DESCRIPTION

[0037] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] Embodiment 1

[0039] Reference Figures 1-6 A mixed cresol alkylation reaction liquid catalyst quantitative adding system, comprising a catalyst storage tank 1, a catalyst adding mechanism 2 and a reaction kettle 19, the catalyst adding mechanism 2 comprises a base 7, a guide column 3 is rotatably installed at the top end of the base 7, a guide rail 301 is fixed outside the guide column 3, the guide rail 301 extends spirally, a groove 3011 is formed on the side of the guide rail 301 away from the guide column 3, a lifting mechanism 8 is further fixed at the top end of the base 7, a crossbar 9 is connected to the output end of the lifting mechanism 8, the end of the crossbar 9 away from the lifting mechanism 8 extends into the groove 3011, three catalyst drop tanks 5 are fixed to the top end of the guide column 3 through a support 4, a vertical pipe 6 is fixed to the top end of the support 4, a rotary joint 602 is installed at the top end of the vertical pipe 6, a material adding pipe 603 is connected between the rotary joint 602 and the catalyst storage tank 1, a horizontal pipe 601 is connected to one side of the vertical pipe 6, and the horizontal pipe 601 communicates with one of the catalyst drop tanks 5.

[0040] Among them, intermediate overflow pipes 501 are connected between the three catalyst drop tanks 5 in sequence, an overflow return pipe 502 is connected to the last catalyst drop tank 5, and the overflow return pipe 502 communicates with the catalyst storage tank 1.

[0041] The catalyst in the catalyst storage tank 1 is pumped into the first catalyst drop tank 5 through the material adding pipe 603, the rotary joint 602 and the cross pipe 601, and then when the first catalyst drop tank 5 is full, it is pumped into the next catalyst drop tank 5 through the intermediate overflow pipe 501, and when the three catalyst drop tanks 5 are full, it is returned to the catalyst storage tank 1 through the overflow return pipe 502, so that the catalyst is not wasted, and the three catalyst drop tanks 5 can be filled at one time, the adding efficiency is high, and after being filled at one time, the three catalyst drop tanks 5 can be added dropwise in turn to the reaction kettle 19, which can be used three times, and the catalyst adding efficiency is further improved.

[0042] The horizontal rod 9 can be vertically lifted and moved by the lifting mechanism 8. Since the horizontal rod 9 is clamped in the groove 3011, when the horizontal rod 9 is lifted and moved, it can drive the guide column 3 to rotate relative to the base 7, so as to drive the three catalyst drop tanks 5 to rotate. The guide rails 301 extend in a spiral shape, and have vertical parts between the guide rails 301. When the horizontal rod 9 moves in the vertical part of the guide rail 301, the guide column 3 remains stationary, so as to sequentially drive each catalyst drop tank 5 to a specified position, and then drop the catalyst into the reaction kettle 19.

[0043] Embodiment 2

[0044] Referring to Figures 3-5 The lifting mechanism 8 comprises a fixing frame, a threaded rod 802 and a guide rod 801 are respectively installed on the fixing frame, a lifting plate 803 is further arranged on the fixing frame, a threaded sleeve 8031 is installed on the lifting plate 803, the threaded sleeve 8031 is threadedly installed outside the threaded rod 802, the guide rod 801 penetrates the lifting plate 803 through a guide hole, a rotary motor 804 is installed at the top of the lifting mechanism 8, the rotary motor 804 drives the threaded rod 802 to rotate, and the lifting plate 803 is fixed with the horizontal rod 9. The guide roller 901 is rotatably installed on the side of the horizontal rod 9 away from the lifting plate 803.

[0045] The threaded rod 802 is driven to rotate by the rotary motor 804, which can drive the lifting plate 803 to move up and down, and in turn drive the horizontal rod 9 to vertically slide in the groove 3011 to drive the guide column 3 to rotate. The existence of the guide roller 901 can reduce the friction between the horizontal rod 9 and the inner wall of the groove 3011.

[0046] Embodiment 3

[0047] Referring to Figure 6The bottom end of the catalyst dropping tank 5 is fixed with a vertical sleeve 12 and a first cylinder 10, the inside of the catalyst dropping tank 5 is installed with a piston 11, the output shaft of the first cylinder 10 extends into the catalyst dropping tank 5 and is fixed with the bottom end of the piston 11, the piston 11 is installed with a discharge insertion tube 17, the bottom end of the discharge insertion tube 17 movably extends into the vertical sleeve 12;

[0048] The piston 11 can be pushed to move up by the first cylinder 10, so as to change the volume of the part above the piston 11 in the catalyst dropping tank 5, so as to change the amount of catalyst that can be stored in the catalyst dropping tank 5, which can be adjusted according to actual needs, so as to conveniently measure catalysts of different volumes and use more conveniently.

[0049] The bottom end of the vertical sleeve 12 extends to the outside of the catalyst dropping tank 5 and is fixed with a first connecting head 13, the catalyst adding mechanism 2 further comprises a second cylinder 15, the output end of the second cylinder 15 is fixed with a second connecting head 14, the first connecting head 13 and the second connecting head 14 are matched with each other, and the second connecting head 14 is communicated with a reaction kettle 19 through a hose 16;

[0050] The first connecting head 13 and the second connecting head 14 can be engaged by the second cylinder 15, so as to add the catalyst stored in the catalyst dropping tank 5 into the reaction kettle 19.

[0051] Embodiment 4

[0052] Reference Figures 7-11 The difference between this embodiment and embodiment 3 is that two vertical sliding rods 18 are slidingly installed in the first connecting head 13, the top end of the vertical sliding rod 18 is connected with a spring 1801, and the bottom end support of the two vertical sliding rods 18 is fixed with a first extrusion ring 1802.

[0053] When the first extrusion ring 1802 is extruded, the spring 1801 will be compressed, which can push the vertical sliding rod 18 to move upward.

[0054] The first connecting head 13 is provided with a blocking plate 1201, the blocking plate 1201 is provided with a fan-shaped leakage hole 1202, the top end of the blocking plate 1201 is rotatably installed with a vertical shaft 1203, the vertical shaft 1203 is fixed with a fan-shaped blocking plate 1207 through a connecting rod 1206, the fan-shaped blocking plate 1207 is matched with the fan-shaped leakage hole 1202, when the vertical shaft 1203 rotates relative to the blocking plate 1201, the fan-shaped blocking plate 1207 can be driven to rotate relative to the fan-shaped leakage hole 1202, when the fan-shaped blocking plate 1207 corresponds to the fan-shaped leakage hole 1202, the fan-shaped leakage hole 1202 can be blocked, when the fan-shaped blocking plate 1207 is dislocated from the fan-shaped leakage hole 1202, the catalyst can flow out of the first connecting head 13.

[0055] The top end of the vertical shaft 1203 is fixed with a guide column 1204, the outer side of the guide column 1204 is provided with a helical line guide groove 1205, the vertical sliding rod 18 is fixed with a horizontal inserting rod 1803, the end of the horizontal inserting rod 1803 away from the vertical sliding rod 18 extends into the helical line guide groove 1205, due to the guide effect of the helical line guide groove 1205, when the horizontal inserting rod 1803 vertically moves, the horizontal inserting rod 1803 can move along the helical line guide groove 1205 and push the guide column 1204 to rotate relative to the blocking plate 1201, so that the sector-shaped blocking plate 1207 can open and close the sector-shaped leakage hole 1202, when the spring 1801 is in a natural state, the horizontal inserting rod 1803 is located at the lowest position of the helical line guide groove 1205, at this time, the sector-shaped blocking plate 1207 just corresponds to the sector-shaped leakage hole 1202 and blocks the sector-shaped leakage hole 1202, the inside of the second connecting head 14 is fixed with a second extrusion ring 1208, the second extrusion ring 1208 is the same diameter as the first extrusion ring 1802 and corresponds to each other, when the second cylinder 15 drives the second connecting head 14 to insert into the first connecting head 13, the second extrusion ring 1208 contacts the first extrusion ring 1802 and pushes the first extrusion ring 1802 upwards, so that the vertical sliding rod 18 and the horizontal inserting rod 1803 can be pushed upwards to overcome the elastic force of the spring 1801, in the process of vertical movement of the horizontal inserting rod 1803 in the helical line guide groove 1205, the sector-shaped blocking plate 1207 can be driven to rotate relative to the blocking plate 1201, when the second connecting head 14 and the first connecting head 13 are completely abutted together, the sector-shaped blocking plate 1207 can be driven to completely deviate from the sector-shaped leakage hole 1202, so that when the second connecting head 14 and the first connecting head 13 are completely abutted together, the catalyst can automatically flow out of the first connecting head 13, without needing to additionally add a valve, and the use is more convenient.

[0056] The outside of the second connecting head 14 is provided with a rubber sealing ring 1401, when the second connecting head 14 and the first connecting head 13 are completely abutted together, the rubber sealing ring 1401 is located between the connecting position of the second connecting head 14 and the first connecting head 13 and can prevent the catalyst from leaking.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0058] In the present application, unless otherwise explicitly specified and limited, the terms "arranged", "mounted", "connected", "linked", "fixed" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] The control mode of the present application is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming by those skilled in the art. The power supply is also known in the art. The present application is mainly used to protect mechanical devices, so the control mode and circuit connection of the present application will not be explained in detail.

[0060] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A liquid catalyst dosing system for mixed cresol alkylation reaction, comprising a catalyst storage tank (1), a catalyst adding mechanism (2) and a reactor (19), characterized in that: The catalyst adding mechanism (2) comprises a catalyst dropping tank (5); The bottom end of the catalyst dropping tank (5) is fixed with a vertical sleeve (12) and a first cylinder (10), the inside of the catalyst dropping tank (5) is provided with a piston (11), the output shaft of the first cylinder (10) extends into the catalyst dropping tank (5) and is fixed with the bottom end of the piston (11), the piston (11) is provided with a discharge nozzle (17), and the bottom end of the discharge nozzle (17) extends into the vertical sleeve (12) in a movable manner; The bottom end of the vertical sleeve (12) extends to the outside of the catalyst dropping tank (5) and is fixed with a first connecting head (13), the catalyst adding mechanism (2) further comprises a second cylinder (15), the output end of the second cylinder (15) is fixed with a second connecting head (14), the first connecting head (13) and the second connecting head (14) are matched with each other, and the second connecting head (14) is communicated with a reaction kettle (19) through a hose (16); Two vertical sliding rods (18) are slidably arranged in the first connecting head (13), the top end of the vertical sliding rod (18) is connected with a spring (1801), and the bottom end support of the two vertical sliding rods (18) is fixed with a first extrusion ring (1802); The first connecting head (13) is provided with a blocking plate (1201), the blocking plate (1201) is provided with a fan-shaped leakage hole (1202), the top end of the blocking plate (1201) is rotatably provided with a vertical shaft (1203), the vertical shaft (1203) is fixed with a fan-shaped blocking plate (1207) through a connecting rod (1206), and the fan-shaped blocking plate (1207) is matched with the fan-shaped leakage hole (1202); The top end of the vertical shaft (1203) is fixed with a guide column (1204), the outer side of the guide column (1204) is provided with a spiral line guide groove (1205), the vertical sliding rod (18) is fixed with a horizontal insertion rod (1803), and one end of the horizontal insertion rod (1803) away from the vertical sliding rod (18) extends into the spiral line guide groove (1205); The inside of the second connecting head (14) is fixed with a second extrusion ring (1208), the second extrusion ring (1208) has the same diameter as the first extrusion ring (1802) and corresponds to each other, and the outside of the second connecting head (14) is provided with a rubber sealing ring (1401).

2. The liquid catalyst dosing system for mixed cresol alkylation reaction according to claim 1, characterized in that: The catalyst adding mechanism (2) further comprises a base (7), a guide column (3) is rotatably installed at the top end of the base (7), a guide rail (301) is fixed to the outer side of the guide column (3), the guide rail (301) extends spirally, a groove (3011) is formed in the side of the guide rail (301) away from the guide column (3), a lifting mechanism (8) is further fixed to the top end of the base (7), a cross rod (9) is connected to the output end of the lifting mechanism (8), the end of the cross rod (9) away from the lifting mechanism (8) extends into the groove (3011), three catalyst dropping tanks (5) are fixed to the top end of the guide column (3) through a support (4), a vertical pipe (6) is fixed to the top end of the support (4), a rotary joint (602) is installed at the top end of the vertical pipe (6), a material adding pipe (603) is connected between the rotary joint (602) and the catalyst storage tank (1), a cross pipe (601) is connected to one side of the vertical pipe (6), and the cross pipe (601) is in communication with one of the catalyst dropping tanks (5).

3. The liquid catalyst dosing system for mixed cresol alkylation reaction according to claim 2, characterized in that: Intermediate overflow pipes (501) are connected between the three catalyst dropping tanks (5) in a head-to-tail manner, an overflow return pipe (502) is connected to the last catalyst dropping tank (5), and the overflow return pipe (502) is in communication with the catalyst storage tank (1).

4. The liquid catalyst dosing system for mixed cresol alkylation reaction according to claim 2, characterized in that: The lifting mechanism (8) comprises a fixing frame, a threaded rod (802) and a guide rod (801) are respectively installed on the fixing frame, a lifting plate (803) is further arranged on the fixing frame, a threaded sleeve (8031) is installed on the lifting plate (803), the threaded sleeve (8031) is threadedly installed on the outside of the threaded rod (802), and the guide rod (801) penetrates through the lifting plate (803) through a guide hole.

5. The liquid catalyst dosing system for mixed cresol alkylation reaction according to claim 4, characterized in that: A rotary motor (804) is installed at the top end of the lifting mechanism (8), the rotary motor (804) drives the threaded rod (802) to rotate, the lifting plate (803) is fixed with the cross rod (9), and a guide roller (901) is rotatably installed on the side of the cross rod (9) away from the lifting plate (803).

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