CN116371333A - Reaction kettle for producing cellulose mixed ether - Google Patents

Abstract

The invention relates to a reaction kettle for producing cellulose mixed ether, which comprises a reaction kettle tank body, a reaction kettle upper cover and stirring paddles. The bottom of the reaction kettle tank body is provided with a discharge hole, and a valve is arranged at the discharge hole. The top of the upper cover of the reaction kettle is connected with a first feeding pipe, a second feeding pipe, a boosting pipe and a pressure relief pipe in a penetrating way. A stop valve is arranged on the first feeding pipe. The second feeding pipe is connected with a chloromethane feeding pipeline, an ethylene oxide feeding pipeline and a dimethyl ether feeding pipeline through valves respectively. The pressure increasing pipe is connected with a nitrogen supply pipeline. The pressure release pipe is connected with the separating device. The stirring paddle comprises a paddle shaft, the paddle shaft is coaxially arranged inside the reaction kettle tank body, paddles are fixed on the paddle shaft, and the upper end of the paddle shaft penetrates through the reaction kettle upper cover and is fixed with a first bevel gear. The upper cover of the reaction kettle is fixedly provided with a first motor, and the first motor drives the first star-following gear to rotate. According to the invention, an auxiliary stirring device is added in the reaction kettle, so that the stirring efficiency is improved, and the cellulose alkalization etherification efficiency is further improved.

Description

Reaction kettle for producing cellulose mixed ether

Technical Field

The invention belongs to cellulose mixed ether production equipment, and particularly relates to a reaction kettle for producing cellulose mixed ether.

Background

Cellulose mixed ether refers to an ether having two substituents of different nature on the molecular chain of the cellulose ether. Because the properties of two different cellulose ethers are combined, the cellulose ether can fully and perfectly exert the properties of the cellulose ether, has better solubility, dispersibility, transparency, enzyme resistance, salt resistance and the like than single ether, and is widely applied to a plurality of industrial fields and daily life.

In the production process of cellulose mixed ether, a reaction kettle is needed, the structure of the existing reaction kettle is a tank body, a stirring paddle is arranged in the tank body, a filler port is arranged at the top of the tank body, and a discharge port is arranged at the bottom of the tank body. The stirring direction of the stirring paddle is single, and the stirring efficiency is low.

Disclosure of Invention

The invention aims to solve the technical problems that: the invention provides the reaction kettle for producing the cellulose mixed ether, which overcomes the defects of the prior art, and an auxiliary stirring device is added in the reaction kettle, so that the stirring efficiency is improved, and the cellulose alkalization etherification efficiency is further improved.

The invention solves the problems existing in the prior art by adopting the technical scheme that:

the reaction kettle for producing the cellulose mixed ether comprises a reaction kettle tank body with an open upper end, and a reaction kettle upper cover and a stirring paddle which are covered above the reaction kettle tank body.

The bottom of the reaction kettle tank body is provided with a discharge hole, and a valve is arranged at the discharge hole.

The top of the upper cover of the reaction kettle is connected with a first feeding pipe, a second feeding pipe, a boosting pipe and a pressure relief pipe in a penetrating way.

A stop valve is arranged on the first feeding pipe.

The second feeding pipe is connected with a chloromethane feeding pipeline, an ethylene oxide feeding pipeline and a dimethyl ether feeding pipeline through valves respectively.

The pressure increasing pipe is connected with a nitrogen supply pipeline.

The pressure release pipe is connected with the separating device.

The stirring paddle comprises a paddle shaft, the paddle shaft is coaxially arranged inside the reaction kettle tank body, paddles are fixed on the paddle shaft, and the upper end of the paddle shaft penetrates through the reaction kettle upper cover and is fixed with a first bevel gear.

The upper cover of the reaction kettle is fixedly provided with a first motor, and the first motor drives the first star-following gear to rotate.

Preferably, the reaction kettle tank body is a cylindrical area, a round platform area and a blanking pipe which are coaxially arranged from top to bottom in sequence, the vertical cross section shape of the round platform area is a round platform with the upper end diameter larger than the lower end diameter, the inner diameter of the blanking pipe is the same as the inner diameter of the lower end of the round platform area, and the inner diameter of the cylindrical area is the same as the inner diameter of the upper end of the round platform area. And a gate valve is arranged at the opening of the lower end of the blanking pipe.

Preferably, the paddle shaft is tubular, a central shaft is coaxially arranged in the paddle shaft in a penetrating way, an annular supporting plate is sleeved on the circumferential surface of the central shaft, the supporting plate is positioned in the round platform area, and the lower end of the paddle shaft is rotationally connected with the supporting plate

Spiral sheets are wound on the circumferential surface of the central shaft below the supporting plate, the spiral sheets are inserted into the blanking pipe, and the outer diameter of the spiral sheets is the same as the inner diameter of the blanking pipe.

The upper end of the central shaft penetrates through the outer part of the upper cover of the reaction kettle and is fixed with a second bevel gear.

The output shaft of the first motor drives the second bevel gear to rotate.

Preferably, the lower end of the central shaft is fixedly provided with a bottom shaft, the circumferential surface of the bottom shaft is concavely provided with a ring groove, a lantern ring is sleeved in the ring groove in a rotating way, and the circumferential surface of the lantern ring is fixedly connected with the inner wall of the blanking pipe through a plurality of fixing rods.

Preferably, the inner wall of the reaction kettle tank body is provided with a toothed ring.

The inside of the reaction kettle tank body is provided with a plurality of auxiliary stirring devices which are distributed in an annular array around the axis of the reaction kettle tank body.

The auxiliary stirring device comprises a rotating shaft, a blade and a first gear, wherein one end of the rotating shaft is inserted into the inner wall of the paddle shaft or the inner wall of the blade, and the other end of the rotating shaft is fixedly connected with the first gear.

A plurality of blades are fixedly connected with the circumferential surface of the rotating shaft

The pivot is connected with oar axle or paddle rotation, and first gear sets up on the ring gear, and first gear is connected with the ring gear meshing.

Preferably, a driving mechanism is arranged above the upper cover of the reaction kettle.

The driving mechanism comprises a first transmission rod, a second transmission rod, a third transmission rod, a fourth transmission rod, a fifth transmission rod and a regulating device.

The first transmission rod comprises a third bevel gear and a first belt pulley which are coaxially and fixedly connected through a rotating rod.

The second transmission rod comprises a fourth bevel gear, a second belt pulley and a third belt pulley which are coaxially and fixedly connected through a rotating rod.

The third transmission rod comprises a driven gear, a fourth belt pulley, a second gear and a third gear which are coaxially and fixedly connected through a rotating rod.

The fourth transmission rod comprises a fifth belt pulley and a fourth gear which are coaxially and fixedly connected through a rotating rod.

The fifth transmission rod comprises a sixth belt pulley and a fifth gear which are coaxially and fixedly connected through a rotating rod.

The regulating device comprises a second telescopic rod, a vertical rod, an upper roller and a lower roller, wherein the second telescopic rod, the vertical rod, the upper roller and the lower roller are vertically arranged, the lower end of the vertical rod is fixedly connected with the top end of the telescopic part of the second telescopic rod, the upper roller and the lower roller are respectively arranged on two sides of the vertical rod, and the axes of the upper roller and the lower roller are horizontally arranged.

The third bevel gear is meshed with the second bevel gear, and the first belt pulley is connected with the fifth belt pulley through a first synchronous belt.

The fourth conical gear is meshed with the first conical gear, the second belt pulley is connected with the fourth belt pulley through a second synchronous belt, and the third belt pulley is connected with the sixth belt pulley through a third synchronous belt.

The vertical rod is arranged between the second synchronous belt and the third synchronous belt, the upper roller is positioned right above the second synchronous belt, and the lower roller is positioned right below the third synchronous belt.

When the upper roller is not contacted with the second synchronous belt, the second synchronous belt is in a loose state.

When the lower roller is not contacted with the third synchronous belt, the third synchronous belt is in a loose state.

The driven gear is meshed with a driving gear on the output shaft of the first motor, the second gear is meshed with a fifth gear, and the third gear is meshed with a fourth gear.

Preferably, the separation device comprises three liquefaction tanks for liquefying the ethylene oxide, the chloromethane and the dimethyl ether respectively.

The liquefying tank comprises a first tank body, the inner cavity of the first tank body is cuboid, a snake-shaped refrigerating pipe is arranged in the inner wall of the length direction of the first tank body, and an inlet and an outlet of the snake-shaped refrigerating pipe penetrate through the first tank body and are connected with a pipeline of the refrigerating unit in a penetrating mode.

The first box body is provided with an air inlet pipe and an air outlet pipe which are connected with the inner cavity of the first box body in a penetrating way, the bottom of the first box body is concavely provided with a liquid discharging groove, the bottom of the liquid discharging groove is connected with a liquid discharging pipe in a penetrating way, and the tail end of the liquid discharging pipe is penetrated outside the first box body.

A valve is arranged on the liquid discharge groove or the liquid discharge pipe.

An air inlet pipe of a liquefaction box for liquefying the ethylene oxide is communicated with a pressure release pipe of the reaction kettle.

The exhaust pipe of the liquefaction box for liquefying the ethylene oxide is connected with the air inlet pipe of the liquefaction box for liquefying the chloromethane in a penetrating way.

The exhaust pipe of the liquefied methyl chloride liquefying tank is connected with the air inlet pipe of the liquefied dimethyl ether liquefying tank in a penetrating way.

The exhaust pipe of the liquefied dimethyl ether liquefying tank is communicated with the nitrogen recovery pipeline.

Preferably, a piston is vertically arranged in the first box body, and the peripheral end face of the piston is abutted against the inner wall of the first box body.

At least two screws are arranged in the first box body along the length direction, the screws penetrate through the piston, the screws are in threaded connection with the piston, one end of each screw is inserted into the inner wall of the first box body, and the other end of each screw penetrates through the outer portion of the first box body and is fixedly connected with a seventh belt pulley.

The second motor is fixed outside the first box body, the output shaft of the second motor is fixed with an eighth belt pulley, and the eighth belt pulley is connected with all seventh belt pulleys through a same fourth synchronous belt.

Preferably, the air inlet pipe and the air outlet pipe are connected with the side wall at one end of the first box body in the length direction.

The side wall at the other end of the length direction of the first box body is provided with a through hole.

One end of the piston facing the through hole is fixed with a rubber sleeve which is in threaded connection with the screw rod.

Preferably, the liquefying tank is externally provided with a gas tank, and the gas tank comprises a second tank body with an open upper end.

The opening of the upper part of the second box body is covered with an elastic sealing gasket, and the elastic sealing gasket is fixedly connected with the second box body through a fixed frame.

The second box body is externally connected with an assay tube in a penetrating way, a stop valve is arranged on the assay tube, and the through hole is connected with the second box body in a penetrating way through a connecting air passage.

Compared with the prior art, the invention has the beneficial effects that:

(1) The rotation axis of the inside auxiliary stirring device of reation kettle and the rotation axis mutually perpendicular of stirring rake, and then change the flow condition of the inside material of reation kettle, improve stirring efficiency, and then improve the basification etherification efficiency of cellulose.

(2) The spiral sheets with equal diameters are arranged in the discharging pipe, discharging is carried out through the spiral sheets, and the discharging effect is better.

(3) The unreacted chloromethane, ethylene oxide and dimethyl ether are recovered and separated by a separation device and then utilized.

Drawings

The invention will be further described with reference to the drawings and examples.

FIG. 1 is a diagram showing the outline of a reaction kettle in a reaction kettle for producing cellulose mixed ether,

FIG. 2 is an exploded view of a reaction kettle in the reaction kettle for producing cellulose mixed ether,

figure 3 is an enlarged view of a portion of figure 2 at a,

FIG. 4 is a first cross-sectional view of a reaction kettle in the reaction kettle for producing cellulose mixed ether according to the invention,

FIG. 5 is a second cross-sectional view of the reaction kettle in the reaction kettle for producing cellulose mixed ether according to the invention,

figure 6 is an enlarged view of a portion of figure 5 at B,

FIG. 7 is a horizontal sectional view of a discharge pipe of a reaction kettle in the reaction kettle for producing cellulose mixed ether according to the present invention,

FIG. 8 is a horizontal sectional view of a gate valve of a reaction kettle in the reaction kettle for producing cellulose mixed ether according to the invention,

figure 9 is a longitudinal cross-sectional view of figure 7,

figure 10 is an enlarged view of a portion of figure 9 at C,

FIG. 11 is a structural view of a stirring paddle and a driving mechanism of a reaction kettle in the reaction kettle for producing cellulose mixed ether,

FIG. 12 is a view showing the outline of a stirring paddle of a reaction kettle in the reaction kettle for producing cellulose mixed ether,

FIG. 13 is a view showing the outline of a driving mechanism of a reaction kettle in the reaction kettle for producing cellulose mixed ether according to the present invention,

FIG. 14 is a first external view of a separation device in a reaction kettle for producing cellulose mixed ether,

FIG. 15 is a second external view of the separation device in the reaction kettle for producing cellulose mixed ether,

FIG. 16 is an exploded view of the gas box in the separating device in the reactor for producing cellulose mixed ether according to the present invention,

FIG. 17 is a sectional view of the outer shell of the liquefying case in the separating device in the reaction kettle for producing cellulose mixed ether,

figure 18 is an enlarged view of a portion of figure 17 at D,

FIG. 19 is a sectional view of a liquid level sensor of a liquefying tank in a separating device in a reaction kettle for producing cellulose mixed ether according to the present invention,

FIG. 20 is a cross-sectional view of the piston of the liquefying tank in the separating device in the reactor for producing cellulose mixed ether according to the present invention,

FIG. 21 is a view showing the external appearance of a cooling pipe inside a liquefying tank in a separating device in a reactor for producing cellulose mixed ether according to the present invention,

FIG. 22 is a diagram showing the connection effect of the piston and the driving mechanism of the liquefying tank in the separating device in the reaction kettle for producing cellulose mixed ether,

figure 23 is a flow chart of a process for producing the cellulose mixed ether of the present invention,

FIG. 24 is a flow chart of a refrigeration system in the process of producing the cellulose mixed ether of the present invention.

In the figure: 1-reaction kettle tank body, 101-blanking pipe, 1011-lantern ring, 1012-fixed rod, 102-valve body, 1021-slot, 103-round platform area, 2-reaction kettle upper cover, 201-first feeding pipe, 202-second feeding pipe, 203-pressure boosting pipe, 204-pressure releasing pipe, 3-paddle shaft, 301-paddle, 302-first conical gear, 4-auxiliary stirring device, 401-rotating shaft, 402-blade, 403-first gear, 5-toothed ring, 501-limit ring, 6-spiral piece, 601-bottom shaft, 602-annular groove, 603-central shaft, 604-second conical gear, 605-supporting plate, 7-plugboard, 701-first telescopic rod, 8-first motor, 801-driving gear, 9-first transmission rod 901-third bevel gear, 902-first pulley, 10-second transmission rod, 1001-fourth bevel gear, 1002-second pulley, 1003-third pulley, 11-third transmission rod, 1101-driven gear, 1102-fourth pulley, 1103-second gear, 1104-third gear, 12-fourth transmission rod 1201-fifth pulley, 1202-fourth gear, 13-fifth transmission rod, 1301-sixth pulley, 1302-fifth gear, 14-regulating device 1401-a second telescopic rod, 1402-a vertical rod, 1403-an upper roller, 1404-a lower roller, 15-a first synchronous belt, 16-a second synchronous belt, 17-a third synchronous belt, 18-protecting cover;

19-a first box body, 1901-a guide rod, 1902-a through hole, 1903-a liquid discharge groove, 1904-a through cavity, 20-a piston, 2001-a rubber sleeve, 21-a screw rod, 2101-a seventh belt pulley, 22-a second motor, 2201-an eighth belt pulley, 2202-a fourth synchronous belt, 23-a snake-shaped refrigeration pipe, 24-an air inlet pipe, 25-an exhaust pipe, 26-a lifting valve, 27-a liquid discharge pipe and 28-an electronic liquid level meter;

29-an air box, 2901-a second box body, 2902-an elastic sealing gasket, 2903-a fixed frame, 2904-an assay tube and 30-a connecting air passage;

31-nitrogen tanks, 32-intermediate tanks, 33-storage tanks, 34-common refrigeration units, 35-standby refrigeration units, 36-temperature sensors and 37-electric control three-way valves;

01-nitrogen inlet pipe, 02-nitrogen return pipe, 03-connecting pipe, 04-first collecting liquid pipe, 05-second collecting liquid pipe, 06-first liquid inlet pipe, 07-second liquid inlet pipe and 08-third liquid inlet pipe;

001-low temperature box refrigerant discharge pipe, 002-refrigerant reuse pipe, 003-high temperature box refrigerant feed pipe, 004-high temperature box refrigerant discharge pipe, 005-common unit refrigerant return pipe, 006-low temperature box refrigerant supply pipe, 007-low temperature box refrigerant bypass, 008-reserve unit refrigerant discharge pipe, 009-high temperature box reserve refrigerant supply pipe, 0011-high temperature box reserve refrigerant return branch pipe, 0012-high temperature box refrigerant total return pipe, 0013-reserve unit refrigerant return pipe, 0014-low temperature box reserve refrigerant supply header pipe, 0015-low temperature box reserve refrigerant supply branch pipe, 0016-low temperature box reserve refrigerant return pipe.

Detailed Description

Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The reactor for producing cellulose mixed ether according to the present invention will be described in further detail with reference to the accompanying drawings, but is not intended to limit the present invention.

The alkalization etherification efficiency of cellulose and the stirring efficiency of methyl chloride, ethylene oxide and dimethyl ether are affected by the stirring efficiency of a reaction kettle, but the stirring paddles of the existing stirring kettle are of paddle type, hinge paddle type, anchor type, frame type, push type or straight She Guo type and rotate only around a paddle shaft, so that the material flow in the reaction kettle is regular, more material impacts can not be generated, the contact and reaction probability among different materials is reduced, and the inside alkalization etherification efficiency of the reaction kettle is affected.

In order to improve the reaction efficiency of the reaction kettle, the reaction kettle is optimally designed in the embodiment. The reaction kettle comprises a reaction kettle tank body 1 with an open upper end, and a reaction kettle upper cover 2 and a stirring paddle which are covered above the reaction kettle tank body 1.

The bottom of the reaction kettle tank body 1 is provided with a discharge hole, a valve is arranged at the discharge hole, the reaction kettle is vertical, and the discharge hole is arranged right below, so that the discharge is facilitated.

The reaction kettle tank body 1 is internally provided with a heating pipeline, oil conduction oil circulates in the pipeline, the pipeline is connected with an external conduction oil heating device, and the interior of the reaction kettle tank body 1 is heated through high-temperature conduction oil. Or an electric heating sheet is added in the inner wall of the reaction kettle tank body 1, and the inside of the reaction kettle tank body 1 is heated by generating heat.

In order to further facilitate the discharging, the reaction kettle tank body 1 is sequentially provided with a cylindrical area, a round platform area 103 and a discharging pipe 101 which are coaxially arranged from top to bottom. The cylindrical region and the blanking pipe 101 are both cylindrical. The vertical cross section of the round platform area 103 is in a round platform shape, the diameter of the upper end of the round platform is larger than that of the lower end of the round platform area, the inner diameter of the blanking pipe 101 is the same as that of the lower end of the round platform area 103, and the inner diameter of the cylindrical area is the same as that of the upper end of the round platform area 103.

The opening of the lower end of the blanking pipe 101 is provided with a gate valve, and the gate valve comprises a valve body 102, a gate 7 and a first telescopic rod 701. The middle of the valve body 102 is provided with a through hole with the same diameter as the blanking pipe 101, the circumferential surface of the through hole is internally provided with a slot 1021, and half of the slot 1021 is communicated with the outer wall of the valve body 102. The insertion plate 7 is inserted into the insertion groove 1021, and the end surface of the insertion plate 7 exposed to the outside of the valve body 102 is fixedly connected to the end of the telescopic part of the first telescopic rod 701. The first telescopic rod 701 is fixed to the outer wall of the valve body 102.

The first telescopic rod 701 is an electric telescopic rod, and adopts the prior art. The telescopic part of the valve body stretches to drive the plugboard 7 to slide out of the slot 1021, so that a through hole in the middle of the valve body 102 is opened, and blanking can be performed; the telescopic part is shortened, the plug board 7 is driven to be inserted into the slot 1021, and the through hole in the middle of the valve body 102 is blocked.

The top of the reaction kettle upper cover 2 is connected with a first feeding pipe 201, a second feeding pipe 202, a pressure boosting pipe 203 and a pressure relief pipe 204 in a penetrating way.

A stop valve is arranged on the first feeding pipe 201 for adding powdery cellulose and alkali liquor under normal pressure;

the second feeding pipe 202 is respectively connected with a chloromethane feeding pipeline, an ethylene oxide feeding pipeline and a dimethyl ether feeding pipeline through valves, and a one-way valve is connected in series on the second feeding pipe 202, so that the one-way valve ensures that materials can be added into the reaction kettle only through the second feeding pipe 202;

the pressure boosting pipe 203 is connected with a nitrogen supply pipeline, and a one-way valve is also arranged on the pressure boosting pipe 203;

the pressure relief pipe 204 is connected to the separator and is also provided with a check valve.

The stirring paddle comprises a vertical paddle shaft 3, the paddle shaft 3 is coaxially arranged inside the reaction kettle tank body 1, a paddle 301 is fixed on the paddle shaft 3, and the paddle 301 adopts a frame type or anchor type. The upper end of the paddle shaft 3 is penetrated outside the upper cover 2 of the reaction kettle and is fixed with a first bevel gear 302.

The paddle shaft 3 is tubular, a central shaft 603 is coaxially arranged in the paddle shaft 3 in a penetrating mode, an annular supporting plate 605 is sleeved on the circumferential surface of the central shaft 603, the supporting plate 605 is located in the round platform area 103, and the lower end of the paddle shaft 3 is connected with the supporting plate 605 in a rotating mode.

The central shaft 603 is located on the circumference below the supporting plate 605 and is wound with the spiral sheet 6, the spiral sheet 6 is inserted into the blanking pipe 101, and the outer diameter of the spiral sheet 6 is the same as the inner diameter of the blanking pipe 101, that is, the outer wall of the spiral sheet 6 contacts with the inner wall of the blanking pipe 101. The height of the spiral sheet 6 is higher than that of the blanking pipe 101, i.e. a part of the spiral sheet 6 is positioned inside the truncated cone region 103.

The upper end of the central shaft 603 is penetrated outside the upper cover 2 of the reaction kettle and is fixed with a second bevel gear 604.

The lower end of the central shaft 603 is fixed with a bottom shaft 601, a ring groove 602 is concavely arranged on the circumferential surface of the bottom shaft 601, a lantern ring 1011 is rotatably sleeved in the ring groove 602, and the circumferential surface of the lantern ring 1011 is fixedly connected with the inner wall of the blanking pipe 101 through a plurality of fixing rods 1012. The distance between the bottom surface of the bottom shaft 601 and the insert plate 7 is less than 1cm.

The reaction kettle tank body 1 is internally provided with a plurality of auxiliary stirring devices 4 distributed in an annular array around the axis thereof.

The auxiliary stirring device 4 comprises a rotating shaft 401, a blade 402 and a first gear 403, wherein one end of the rotating shaft 401 is inserted into the inner wall of the paddle shaft 3 or the paddle 301, and the other end of the rotating shaft is fixedly connected with the first gear 403. The blades 402 are fixedly connected with the circumferential surface of the rotating shaft 401, and the blades 402 can be in a stick shape, a straight plate or a curved plate.

The shaft 401 is rotatably connected to the shaft 3 or the blade 301.

The inner wall of the reaction kettle tank body 1 is provided with a toothed ring 5 which is coaxially and fixedly connected, a first gear 403 is arranged on the toothed ring 5, and the first gear 403 is meshed and connected with the toothed ring 5. The rotating stirring paddle drives the rotating shaft 401 to rotate around the axis of the paddle shaft 3, and then drives the first gear 403 to move along the toothed ring 5. Because the first gear 403 is meshed with the toothed ring 5, the first gear 403 rolls and rotates on the toothed ring 5 to drive the blades 402 to rotate, so as to stir the materials in the reaction kettle. Thus, two devices with different rotation directions are arranged in the reaction kettle at the same time, so that the impact can be generated when materials in the reaction kettle flow, and the reaction efficiency is further improved.

In order to avoid jumping of the first gear 403, a limiting ring 501 is arranged right above the toothed ring 5, the limiting ring 501 is fixedly connected with the inner wall of the reaction kettle tank body 1 in a welding or bolt connection mode, the first gear 403 is located between the toothed ring 5 and the limiting ring 501, and the limiting ring 501 blocks the first gear 403 from jumping upwards.

The reaction kettle upper cover 2 is fixedly provided with a first motor 8 and a driving mechanism.

The driving mechanism comprises a first transmission rod 9, a second transmission rod 10, a third transmission rod 11, a fourth transmission rod 12, a fifth transmission rod 13 and a regulating and controlling device 14.

The first transmission rod 9 comprises a third bevel gear 901 and a first belt pulley 902 which are coaxially and fixedly connected through a rotating rod;

the second transmission rod 10 comprises a fourth conical gear 1001, a second pulley 1002 and a third pulley 1003 which are coaxially and fixedly connected by a rotating rod;

the third transmission rod 11 comprises a driven gear 1101, a fourth belt pulley 1102, a second gear 1103 and a third gear 1104 which are coaxially and fixedly connected by a rotating rod;

the fourth transmission rod 12 comprises a fifth belt pulley 1201 and a fourth gear 1202 which are coaxially and fixedly connected by a rotating rod;

the fifth transmission rod 13 comprises a sixth belt pulley 1301 and a fifth gear 1302 which are coaxially and fixedly connected through a rotating rod;

the regulating device 14 includes a vertically disposed second telescoping rod 1401, a vertical rod 1402, an upper roller 1403, and a lower roller 1404. The second telescopic rod 1401 adopts the electric prior art, and vertical rod 1402 lower extreme and second telescopic rod 1401 telescopic part top fixed connection go up gyro wheel 1403 and lower gyro wheel 1404 and arrange in vertical rod 1402 both sides from top to bottom respectively, go up gyro wheel 1403 and lower gyro wheel 1404 axis horizontal arrangement.

The third bevel gear 901 is in meshed connection with the second bevel gear 604, and the first pulley 902 is connected with the fifth pulley 1201 by the first timing belt 15.

The fourth bevel gear 1001 is engaged with the first bevel gear 302, the second pulley 1002 is connected to the fourth pulley 1102 by the second timing belt 16, and the third pulley 1003 is connected to the sixth pulley 1301 by the third timing belt 17.

The vertical rod 1402 is disposed between the second synchronous belt 16 and the third synchronous belt 17, the upper roller 1403 is located directly above the second synchronous belt 16, and the lower roller 1404 is located directly below the third synchronous belt 17.

When the upper roller 1403 is not in contact with the second timing belt 16, the second timing belt 16 is in a relaxed state; when the lower roller 1404 is not in contact with the third timing belt 17, the third timing belt 17 is in a relaxed state.

The driven gear 1101 is in meshed connection with a driving gear 801 on the output shaft of the first motor 8, the second gear 1103 is in meshed connection with a fifth gear 1302, and the third gear 1104 is in meshed connection with a fourth gear 1202.

The first motor 8 drives the driving gear 801 to rotate, and in order to control the rotation speed of the driving gear 801, the first motor 8 adopts a gear motor, or a reduction gearbox is added between the first motor 8 and the driving gear 801.

The driving gear 801 drives the driven gear 1101 to rotate, and then the third transmission rod 11 drives the fourth transmission rod 12 to rotate, and the second transmission rod 10 is driven to rotate by the second timing belt 16. The fourth transmission rod 12 drives the first transmission rod 9 to rotate through the first synchronous belt 15. The first transmission rod 9 drives the spiral sheet 6 to rotate, and the second transmission rod 10 drives the paddle shaft 3 to rotate, so that the rotating shaft 401 is driven to rotate.

When the materials in the reaction kettle are stirred, the rotation direction of the driving gear 801 is unchanged, and the rotation direction of the spiral sheet 6 enables the materials to move from the discharging pipe 101 to the round platform area 103, so that the materials cannot flow into the gate valve. Meanwhile, as one part of the spiral sheet 6 is positioned in the circular truncated cone region 103 and is in contact with the reaction materials, the spiral sheet can drive the materials from bottom to top, and plays a certain role in stirring.

Under the condition that the rotation direction of the driving gear 801 is kept unchanged, the tightness state of the second synchronous belt 16 and the third synchronous belt 17 is changed by controlling the expansion and contraction of the expansion and contraction part of the second telescopic rod 1401, the rotation direction of the second transmission rod 10 is adjusted, the forward and reverse rotation of the paddle shaft 3 is further changed, and the stirring efficiency inside the reaction kettle is further improved.

Since the second gear 1103 is engaged with the fifth gear 1302, the third transmission lever 11 is rotated in the opposite direction to the fifth transmission lever 15.

When the telescopic part of the second telescopic rod 1401 moves downwards, the upper roller 1403 presses the second synchronous belt 16 downwards, the lower roller 1404 is far away from the third synchronous belt 17, the second synchronous belt 16 is tightened, and the third synchronous belt is loosened, so that the third transmission rod 11 drives the second transmission rod 10 to rotate, and the paddle shaft 3 is driven to rotate in one direction; on the contrary, when the telescopic part of the second telescopic rod 1401 moves upwards, the upper roller 1403 leaves the second synchronous belt 16, the lower roller 1404 presses the third synchronous belt 17, the second synchronous belt 16 is loosened, and the third synchronous belt is tightened, so that the fifth transmission rod 13 drives the second transmission rod 10 to rotate, and drives the paddle shaft 3 to rotate in another direction. Thus by controlling the action of the second telescopic rod 1401, the rotational direction of the shaft 3 is adjusted without changing the rotational direction of the first motor 8.

When discharging is needed, the second telescopic rod 1401 controls the upper roller 1403 and the lower roller 1404 to be not contacted with the two conveyor belts, the first motor 8 is reversed, and the spiral sheet 6 drives the material to move below the feeding pipe 101 and discharge. The inner wall of the round platform area 103 is an inclined plane, so that the blanking is more facilitated.

Unreacted chloromethane, ethylene oxide and dimethyl ether are separated and recovered by adopting a normal pressure condensation mode. To achieve this, the present embodiment designs a separation device.

The separation device comprises three liquefaction tanks which are respectively used for liquefying ethylene oxide, methyl chloride and dimethyl ether, the boiling point of the ethylene oxide is 10.8 ℃ under normal pressure, the boiling point of the methyl chloride is-24.2 ℃, and the boiling point of the dimethyl ether is-29.5 ℃. Thus, the ethylene oxide is liquefied and separated, then the chloromethane is separated, and finally the dimethyl ether is separated.

The liquefying tank comprises a first tank body 19, wherein the inner cavity of the first tank body 19 is a cuboid, and the vertical cross section shape of the first tank body in the width direction is square. An inner wall of the first box 19 in the length direction is provided with a snake-shaped refrigerating pipe 23, and an inlet and an outlet of the snake-shaped refrigerating pipe 23 penetrate through the first box 19 and are connected with a pipeline of a refrigerating unit in a penetrating way.

The outside of the first box 19 is provided with an air inlet pipe 24 and an air outlet pipe 25 which are communicated with the inner cavity of the first box 19, the bottom of the first box 19 is internally provided with a liquid discharge groove 1903, the bottom of the liquid discharge groove 1903 is communicated with a liquid discharge pipe 27, and the tail end of the liquid discharge pipe 27 penetrates through the outside of the first box 19.

A valve is provided on the drain groove 1903 or on the drain pipe 27, and in this embodiment, a lifting valve 26 is provided inside the drain groove 1903. The lifting valve 26 descends to seal the through connection between the drain groove 1903 and the drain pipe 27, and the lifting valve 26 is located entirely inside the drain groove 1903.

For liquid level monitoring, a through cavity 1904 is formed in the inner side wall of the first box 19, which is in through connection with the air inlet pipe 24, the upper side and the lower side of the through cavity 1904 are in through connection with the inner side of the first box 19 through holes, and an electronic liquid level meter 28 is vertically arranged in the through cavity 1904.

An air inlet pipe 24 of a liquefaction box for liquefying the ethylene oxide is communicated with a pressure relief pipe 204 of the reaction kettle; an exhaust pipe 25 of a liquefaction tank for liquefying ethylene oxide is connected to an intake pipe 24 of a liquefaction tank for liquefying chloromethane in a penetrating manner; an exhaust pipe 25 of the liquefied methyl chloride liquefaction tank is connected with an air inlet pipe 24 of the dimethyl ether liquefaction tank in a penetrating manner; the exhaust pipe 25 of the liquefied dimethyl ether tank is connected to the nitrogen recovery line.

The air inlet pipe 24 and the air outlet pipe 25 are connected with the side wall at one end of the first box 19 in the length direction, that is, the through hole is located on the side wall at one end of the first box 19 in the length direction. A through hole 1902 is provided in a side wall of the other end of the first housing 19 in the longitudinal direction.

The first box 19 is internally and vertically provided with a piston 20, the peripheral end face of the piston 20 is abutted against the inner wall of the first box 19, and the piston 20 divides the interior of the first box 19 into two mutually independent chambers.

At least two screws 21 are arranged in the first box 19 along the length direction, the screws 21 penetrate through the piston 20, the screws 21 are in threaded connection with the piston 20, one end of each screw 21 is inserted into the inner wall of the first box 19, and the other end of each screw 21 penetrates through the first box 19 and is fixedly connected with a seventh belt pulley 2101.

The second motor 22 is fixed outside the first box 19, an eighth belt pulley 2201 is fixed on the output shaft of the second motor 22, and the eighth belt pulley 2201 and all the seventh belt pulleys 2101 are connected through a fourth synchronous belt 2202.

In this embodiment, two screws 21 symmetrically arranged around the center of the piston 20 are adopted, and the second motor 22 drives the two screws 21 to rotate simultaneously, so that the two screws 21 are synchronous, and thus, jamming in the moving process of the piston 20 is avoided.

In order to further improve the smoothness of the movement of the piston 20, a horizontally arranged guide rod 1901 is fixed between two lateral surfaces of the first box 19 in the length direction, the axis of the guide rod 1901 is parallel to the axis of the screw 21, and the guide rod 1901 penetrates through the piston 20.

To improve the sealing, a sliding seal is provided between the piston 20 and the guide rod 1901.

A rubber sleeve 2001 is fixed to one end of the piston 20 facing the through hole 1902, and the rubber sleeve 2001 is screwed with the screw 21. The rubber sleeve 2001 has elasticity, so that it can be brought into close contact with the screw 21, improving the sealing property.

The inner wall of the first box 19, which is in through connection with the air inlet pipe 24 and the air outlet pipe 25, is embedded with a pressure sensor, and the pressure sensor monitors the pressure of the piston 20 in real time towards the air inlet pipe 24 and the air outlet pipe 25 and inside the space on one side. When the gas enters the first box 19 and the pressure increases, the piston 20 moves towards the direction of the through hole 1902, so that the space is increased and the internal pressure is reduced; when part of the gas is liquefied and the pressure decreases, the piston 20 moves toward the intake pipe 24, decreasing the space and increasing the internal pressure.

The liquefying tank is externally provided with a gas tank 29, the gas tank 29 comprises a second tank body 2901 with an open upper end, an elastic sealing gasket 2902 is covered at the opening of the upper side of the second tank body 2901, and the elastic sealing gasket 2902 is fixedly connected with the second tank body 2901 through a fixing frame 2903.

The second box 2901 is externally and penetratingly connected with an assay tube 2904, a stop valve is arranged on the assay tube 2904, and the through hole 1902 is penetratingly connected with the second box 2901 through a connecting air channel 30. The gas in the gas tank 29 is used for the piston 20 to move, and the elastic sealing gasket 2902 is used for elastically changing the inner space of the second tank 2901 and is matched with the movement of the piston 20.

The addition of the gas box 29 allows the portion of the three first boxes 19 where the piston 20 is directed toward the through-hole 1902 to be connected to form a closed space, so that ethylene oxide, methyl chloride and dimethyl ether flow only inside this space, even though they pass through the piston 20.

The interior of this space can then be periodically inspected by evacuating the test tube 2904 to verify the contents of ethylene oxide, methyl chloride and dimethyl ether to assess the tightness of the piston 20, as is known in the art. The inside of the air box 29 may be supplied with air through the test tube 2904.

The refrigerating unit is the prior art, and the refrigerating unit which has the same principle as an air conditioner is adopted in the embodiment, namely, the refrigerating unit comprises a motor, a compressor, related pipelines and internal refrigerants.

The system that reation kettle and separator constitute still includes nitrogen jar 31, intermediate tank 32, storage jar 33 and electric cabinet, and the electric cabinet adopts prior art, including controlling means and power module, controlling means adopts PLC or the integrated circuit who has the industrial control chip, and all electric devices and electric cabinet electric connection of whole system inside.

The export of nitrogen jar 31 is connected with reation kettle's booster tube 203 through nitrogen gas intake pipe 01, has booster pump and stop valve in series on the nitrogen gas intake pipe 01, to the inside injection high-pressure nitrogen gas of reation kettle, plays the guard action promptly, blows off the inside air of reation kettle clean, also can increase the inside pressure of reation kettle simultaneously, realizes the effect of pressure boost.

An air inlet pipe 24 of a liquefaction box for liquefying the ethylene oxide is communicated with a pressure relief pipe 204 of the reaction kettle through a connecting air pipe 03; the exhaust pipe 25 of the liquefaction box for liquefying the ethylene oxide is communicated with the air inlet pipe 24 of the liquefaction box for liquefying the chloromethane through the connecting air pipe 03; an exhaust pipe 25 of the liquefied methyl chloride liquefaction tank is communicated with an air inlet pipe 24 of the dimethyl ether liquefaction tank through a connecting air pipe 03; the exhaust pipe 25 of the liquefied dimethyl ether tank is connected to the nitrogen tank 31 through a nitrogen return pipe 02.

The drain pipes 27 of the three liquefaction tanks are all connected to the individual intermediate tank 32 through the first collection pipe 04, and the intermediate tank 32 is connected to the individual storage tank 33 through the second collection pipe 05. The first collecting tube 04 and the second collecting tube 05 are connected in series with a pressurizing pump and a stop valve.

Three storage tanks 33 are used to store high pressure liquefied ethylene oxide, methyl chloride and dimethyl ether, respectively.

The three storage tanks 33 are respectively connected with the first feeding pipe 201 in a penetrating way through the first feeding pipe 06, the second feeding pipe 07 and the third feeding pipe 08, and the first feeding pipe 06, the second feeding pipe 07 and the third feeding pipe 08 are all connected with a booster pump and a stop valve in series.

The connecting air pipe 03 and the nitrogen return air pipe 02 can be connected with an air pump and a stop valve in series, and the air in the former container is pumped into the latter container by the air pump.

Gas transfer may also be accomplished in another form. Namely, after the alkalization etherification is completed, the pressure relief pipe 204 is opened first, and the pressure inside the reaction kettle is reduced, so that the ethylene oxide, the chloromethane and the dimethyl ether are gasified. Then, nitrogen with normal pressure is injected into the reaction kettle, and ethylene oxide, chloromethane and dimethyl ether in the reaction kettle are blown out through a pressure relief pipe and blown into a liquefaction box for liquefying the ethylene oxide.

The refrigerating unit reduces the internal temperature of the liquefaction tank for liquefying the ethylene oxide to between-20 ℃ and 10 ℃, and moves the piston 20 to adjust the air pressure in the space where the mixed gas is located so as to maintain the air pressure around the normal pressure, so that the ethylene oxide in the internal mixer starts to liquefy, and the internal air pressure is reduced in the liquefaction process, and the internal pressure is maintained by adjusting the position of the piston 20.

When the refrigerating time reaches a threshold value or the height of the electronic level gauge is not changed and the detection data of the pressure sensor is not changed, the lifting valve 26 is opened, liquefied ethylene oxide is pressurized and pumped into the middle tank 32, high-pressure liquefied ethylene oxide is stored in the middle tank 32, and when the storage amount of the ethylene oxide in the middle tank reaches the threshold value, the liquefied ethylene oxide is pumped into the storage tank 33 of the ethylene oxide.

When the liquefied ethylene oxide is discharged, the piston 20 is moved in the direction of the exhaust pipe 25, and the gas remaining in the first tank 19 is pushed out and pushed into the liquefaction tank for liquefying chloromethane through the connection gas pipe 3. The refrigerating unit reduces the temperature in the liquefying box for liquefying the chloromethane to between-28 ℃ and-25 ℃, liquefies the chloromethane in the mixed gas, and pumps the liquefied chloromethane into the independent intermediate pipe. After all the liquid is discharged, the piston 20 is moved to push the remaining gas into the liquefaction tank for liquefying dimethyl ether.

The refrigerating unit reduces the temperature inside the liquefaction tank for liquefying dimethyl ether to-30 ℃ or lower, liquefies and separates dimethyl ether inside the mixed gas, and pumps the mixed gas into the independent intermediate tank 32.

Then, the piston 20 is moved to push the remaining nitrogen gas into the nitrogen tank 31 for recycling. The gas components in the nitrogen tank 31 are inspected at regular time intervals, and the contents of ethylene oxide, methyl chloride and dimethyl ether in the nitrogen tank are detected.

In this embodiment, two common refrigeration units 34 are provided to cool the liquefied tanks of methyl chloride and dimethyl ether respectively as shown in fig. 2, and two serpentine refrigeration pipes 23 are respectively provided in the two side walls of the liquefied tanks of ethylene oxide opposite to each other in the width direction, and the outlets of the serpentine refrigeration pipes of the liquefied tanks of methyl chloride and dimethyl ether are respectively connected through the inlets of the two serpentine refrigeration pipes 23 in the liquefied tanks of ethylene oxide, so as to save energy consumption. The refrigerant cools the liquefaction tank for methyl chloride and dimethyl ether, and then the temperature of the ethylene oxide liquefaction tank is adjusted by the residual temperature inside the serpentine cooling pipe 23 flowing into the ethylene oxide liquefaction tank.

That is, the two common refrigeration units 34 respectively inject liquid refrigerant into the serpentine refrigeration pipe 23 inside the liquefied tank of methyl chloride and dimethyl ether through the refrigerant supply pipe 006 of the low-temperature tank, the refrigerant reduces the temperature inside the first tank 19 in the liquefied tank of methyl chloride and dimethyl ether, then respectively discharge the refrigerant through the refrigerant discharge pipe 001 of the low-temperature tank, discharge the refrigerant into the serpentine refrigeration pipe 23 inside the liquefied tank of ethylene oxide, adjust the temperature inside the liquefied tank of ethylene oxide, then the refrigerant flows back to the inside of the common refrigeration unit 34 through the refrigerant return pipe 005 of the common refrigeration unit, refrigerates, and starts the next cycle.

However, there may be a case where the temperature of the refrigerant is too high to continue cooling the ethylene oxide liquefaction tank after the refrigerant cools the methyl chloride liquefaction tank or the dimethyl ether liquefaction tank or the methyl chloride and dimethyl ether liquefaction tank. In this case, a backup refrigeration unit 35 is added in this embodiment in order to maintain the temperature of the ethylene oxide liquefaction tank. Meanwhile, the related connecting pipelines are optimally designed.

At this time, a temperature sensor 36 is provided on the low-temperature tank refrigerant discharge pipe 001 for detecting the temperature of the refrigerant inside the low-temperature tank refrigerant discharge pipe 001, an electric control three-way valve 37 is provided at the end of the low-temperature tank refrigerant discharge pipe, and three joints of the electric control three-way valve 37 are connected to the low-temperature tank refrigerant discharge pipe 001, the refrigerant recycling pipe 002, and the low-temperature tank refrigerant bypass discharge pipe 007, respectively.

The tail end of the refrigerant recycling pipe 002 is connected with a high temperature box refrigerant liquid inlet pipe 003 and a high temperature box standby refrigerant supply pipe 009 through an electric control three-way valve.

The tail end of the low-temperature box refrigerant bypass discharge pipe 007 is connected with a common unit refrigerant return pipe 005 through a valve.

The outlets of two serpentine refrigeration pipes 23 in the ethylene oxide liquefaction tank are in through connection with a high-temperature tank refrigerant discharge pipe 004, and the tail end of the high-temperature tank refrigerant discharge pipe 004 is connected with a common unit refrigerant return pipe 005 and a high-temperature tank refrigerant total return pipe 0012 through an electric control three-way valve.

The high-temperature tank refrigerant total return pipe 0012 and the high-temperature tank spare refrigerant supply pipe 009 are respectively connected with the refrigerant inlet and outlet of the spare refrigeration unit 35 in a penetrating manner.

When the temperature sensor 36 detects that the temperature of the refrigerant in the refrigerant discharge pipe 001 of the low-temperature tank is higher than the threshold value, and the temperature in the ethylene oxide liquefying tank cannot be reduced to below 10.8 ℃, the corresponding electric control three-way valve 37 can adjust the refrigerant flowing path. At this time, the refrigerant in the low-temperature box refrigerant discharge pipe 001 flows into the low-temperature box refrigerant bypass discharge pipe 007 through the electric control three-way valve, then flows into the normal unit refrigerant return pipe 005, and finally enters the normal refrigerating unit 34 to cool. The backup refrigerating unit 35 is started, and the low-temperature refrigerant in the backup refrigerating unit flows into the high-temperature tank refrigerant liquid inlet pipe 003 through the high-temperature tank backup refrigerant supply pipe 009 and the electric control three-way valve, and cools the inside of the ethylene oxide liquefaction tank by flowing into the serpentine refrigerating pipe 23 of the ethylene oxide liquefaction tank. The refrigerant after heat exchange flows back to the inside of the spare refrigerating unit 35 through the high-temperature box refrigerant discharge pipe 004, the electric control three-way valve and the high-temperature box refrigerant total return pipe 0012, and is cooled again.

The spare refrigerating unit 35 can not only be used for refrigerating the ethylene oxide liquefaction tank, but also be used as a spare unit to replace any one of the two common refrigerating units 34 when one of the two common refrigerating units 34 fails and stops. To this end, some necessary lines are added.

That is, the refrigerant outlet of the backup refrigeration unit 35 is connected to the backup unit refrigerant discharge pipe 008, and the end of the backup unit refrigerant discharge pipe 008 is connected to the high-temperature tank backup refrigerant supply pipe 009 and the low-temperature tank backup refrigerant supply main 0014, respectively, through the electric control three-way valve.

The low-temperature tank spare refrigerant supply header 0014 is connected to two low-temperature tank spare refrigerant supply branch 0015 by two valves, and the two low-temperature tank spare refrigerant supply branch 0015 respectively supply low-temperature refrigerants to the chloromethane and dimethyl ether liquefaction tanks.

The end of the spare refrigerant supply branch 0015 of the low-temperature tank is connected with a refrigerant supply pipe 006 of the low-temperature tank through a valve, and the spare refrigerant supply branch 0015 of the low-temperature tank is connected with a common refrigerating unit 34 in parallel.

The refrigerant inlet of the backup refrigerating unit 35 is in through connection with a backup unit refrigerant return pipe 0013, and the other end of the backup unit refrigerant return pipe 0013 is connected with a high-temperature box refrigerant total return pipe 0012 and a low-temperature box backup refrigerant return pipe 0016 through an electric control three-way valve.

The other end of the spare refrigerant return pipe 0016 of the low-temperature box is connected with a refrigerant bypass discharge pipe 007 of the low-temperature box and a refrigerant return pipe 005 of a common unit through an electric control three-way valve.

When one of the common refrigeration units 34 fails, the refrigerant flow path becomes: the spare refrigerating device unit 35-the spare refrigerating device refrigerant discharge pipe 008-the low-temperature tank spare refrigerant supply header 0014-the low-temperature tank spare refrigerant supply branch 0015-the low-temperature tank refrigerant supply pipe 006-the dimethyl ether liquefaction tank or the chloromethane liquefaction tank-the low-temperature tank refrigerant discharge pipe 001-the low-temperature tank refrigerant bypass discharge pipe 007-the low-temperature tank spare refrigerant return pipe 0016-the spare refrigerating device unit refrigerant return pipe 0013-the spare refrigerating device 35;

Or, the spare refrigerating device unit 35-the spare refrigerating device refrigerant discharge pipe 008-the low-temperature box spare refrigerant supply header 0014-the low-temperature box spare refrigerant supply branch 0015-the low-temperature box refrigerant supply branch pipe 006-the dimethyl ether liquefaction box or the chloromethane liquefaction box-the low-temperature box refrigerant discharge pipe 001-the refrigerant recycling pipe 002-the ethylene oxide liquefaction box-the high-temperature box refrigerant discharge pipe 004-the high-temperature box refrigerant total return pipe 0012-the spare refrigerating device unit refrigerant return pipe 0013-the spare refrigerating device unit 35.

Since the two serpentine refrigeration tubes 23 inside the ethylene oxide liquefaction tank are independent, they are conveniently connected to one common refrigeration unit 34, respectively, but are not conveniently connected to one backup refrigeration unit 35. In order to cool the ethylene oxide liquefaction tank independently by the utility backup refrigerating unit 35, the refrigerant can be introduced into the two serpentine refrigerating pipes 23, in this embodiment, a backup refrigerant supply branch pipe of the high-temperature tank is connected between the two refrigerant liquid inlet pipes 003 of the high-temperature tank through an electric control three-way valve, and a backup refrigerant return branch pipe 0011 of the high-temperature tank is connected between the two refrigerant discharge pipes 004 of the high-temperature tank through an electric control three-way valve. By adjusting the valve core position of the electric control three-way valve, the two serpentine refrigeration pipes 23 inside the ethylene oxide liquefaction tank are connected into a whole by the spare refrigerant supply branch pipe of the incubator and the spare refrigerant return branch pipe 0011 of the high-temperature tank, so that the spare refrigeration unit 35 can simultaneously inject refrigerants into the two serpentine refrigeration pipes 23.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims (10)

1. Reaction kettle for producing cellulose mixed ether, which is characterized in that:

comprises a reaction kettle tank body (1) with an open upper end, a reaction kettle upper cover (2) and a stirring paddle which are covered above the reaction kettle tank body (1),

a discharge hole is arranged at the bottom of the reaction kettle tank body (1), a valve is arranged at the discharge hole,

the top of the upper cover (2) of the reaction kettle is connected with a first feeding pipe (201), a second feeding pipe (202), a boosting pipe (203) and a pressure relief pipe (204) in a penetrating way,

a stop valve is arranged on the first feeding pipe (201),

the second feeding pipe (202) is respectively connected with a chloromethane feeding pipeline, an ethylene oxide feeding pipeline and a dimethyl ether feeding pipeline through valves,

the pressure boosting pipe (203) is connected with a nitrogen supply pipeline,

the pressure relief pipe (204) is connected with the separating device in a penetrating way,

the stirring paddle comprises a paddle shaft (3), the paddle shaft (3) is coaxially arranged inside the reaction kettle tank body (1), a paddle (301) is fixed on the paddle shaft (3), the upper end of the paddle shaft (3) is penetrated outside the reaction kettle upper cover (2) and is fixed with a first bevel gear (302),

A first motor (8) is fixed on the upper cover (2) of the reaction kettle, and the first motor (8) drives the first star-tracking gear (302) to rotate.

2. The reaction kettle for producing cellulose mixed ether according to claim 1, wherein:

the reaction kettle tank body (1) is sequentially provided with a cylindrical area, a round platform area (103) and a discharging pipe (101) which are coaxially arranged from top to bottom, the vertical cross section shape of the round platform area (103) is a round platform with the upper end diameter larger than the lower end diameter, the inner diameter of the discharging pipe (101) is the same as the inner diameter of the lower end of the round platform area (103), the inner diameter of the cylindrical area is the same as the inner diameter of the upper end of the round platform area (103),

the opening of the lower end of the blanking pipe (101) is provided with a gate valve.

3. The reaction kettle for producing cellulose mixed ether according to claim 2, wherein:

the paddle shaft (3) is tubular, a central shaft (603) is coaxially arranged in the paddle shaft (3), an annular supporting plate (605) is sleeved on the circumferential surface of the central shaft (603), the supporting plate (605) is positioned in the round platform area (103), the lower end of the paddle shaft (3) is rotationally connected with the supporting plate (605),

the peripheral surface of the central shaft (603) below the supporting plate (605) is wound with a spiral sheet (6), the spiral sheet (6) is inserted into the blanking pipe (101), the outer diameter of the spiral sheet (6) is the same as the inner diameter of the blanking pipe (101),

The upper end of the central shaft (603) is penetrated to the outside of the upper cover (2) of the reaction kettle and is fixed with a second bevel gear (604),

an output shaft of the first motor (8) drives the second bevel gear (604) to rotate.

4. The reaction kettle for producing cellulose mixed ether according to claim 3, wherein:

the lower end of the central shaft (603) is fixedly provided with a bottom shaft (601), the circumferential surface of the bottom shaft (601) is concavely provided with a ring groove (602), a sleeve ring (1011) is sleeved in the ring groove (602) in a rotating mode, and the circumferential surface of the sleeve ring (1011) is fixedly connected with the inner wall of the blanking pipe (101) through a plurality of fixing rods (1012).

5. The reaction kettle for producing cellulose mixed ether according to claim 2, 3 or 4, wherein:

the inner wall of the reaction kettle tank body (1) is provided with a toothed ring (5),

a plurality of auxiliary stirring devices (4) distributed in an annular array around the axis of the reaction kettle tank body (1) are arranged in the reaction kettle tank body,

the auxiliary stirring device (4) comprises a rotating shaft (401), a blade (402) and a first gear (403), one end of the rotating shaft (401) is inserted into the inner wall of the paddle shaft (3) or the paddle (301), the other end is fixedly connected with the first gear (403),

a plurality of blades (402) are fixedly connected with the circumference surface of the rotating shaft (401),

the rotating shaft (401) is rotationally connected with the paddle shaft (3) or the paddle (301), the first gear (403) is arranged on the toothed ring (5), and the first gear (403) is meshed with the toothed ring (5).

6. The reaction kettle for producing cellulose mixed ether according to claim 5, wherein:

a driving mechanism is arranged above the upper cover (2) of the reaction kettle,

the driving mechanism comprises a first transmission rod (9), a second transmission rod (10), a third transmission rod (11), a fourth transmission rod (12), a fifth transmission rod (13) and a regulating device (14),

the first transmission rod (9) comprises a third bevel gear (901) and a first belt pulley (902) which are coaxially and fixedly connected through a rotating rod,

the second transmission rod (10) comprises a fourth conical gear (1001), a second belt pulley (1002) and a third belt pulley (1003) which are coaxially and fixedly connected through a rotating rod,

the third transmission rod (11) comprises a driven gear (1101), a fourth belt pulley (1102), a second gear (1103) and a third gear (1104) which are coaxially and fixedly connected through a rotating rod,

the fourth transmission rod (12) comprises a fifth belt pulley (1201) and a fourth gear (1202) which are coaxially and fixedly connected through a rotating rod,

the fifth transmission rod (13) comprises a sixth belt pulley (1301) and a fifth gear (1302) which are coaxially and fixedly connected through a rotating rod,

the regulating device (14) comprises a second telescopic rod (1401), a vertical rod (1402), an upper roller (1403) and a lower roller (1404) which are vertically arranged, the lower end of the vertical rod (1402) is fixedly connected with the top end of a telescopic part of the second telescopic rod (1401), the upper roller (1403) and the lower roller (1404) are respectively arranged at the two sides of the vertical rod (1402) up and down, the axes of the upper roller (1403) and the lower roller (1404) are horizontally arranged,

The third bevel gear (901) is meshed with the second bevel gear (604), the first belt pulley (902) is connected with the fifth belt pulley (1201) through a first synchronous belt (15),

the fourth conical gear (1001) is meshed with the first conical gear (302), the second belt pulley (1002) is connected with the fourth belt pulley (1102) through a second synchronous belt (16), the third belt pulley (1003) is connected with the sixth belt pulley (1301) through a third synchronous belt (17),

the vertical rod (1402) is arranged between the second synchronous belt (16) and the third synchronous belt (17), the upper roller (1403) is positioned right above the second synchronous belt (16), the lower roller (1404) is positioned right below the third synchronous belt (17),

when the upper roller (1403) is not in contact with the second synchronous belt (16), the second synchronous belt (16) is in a loose state,

when the lower roller (1404) is not in contact with the third synchronous belt (17), the third synchronous belt (17) is in a loose state,

the driven gear (1101) is in meshed connection with a driving gear (801) on an output shaft of the first motor (8), the second gear (1103) is in meshed connection with a fifth gear (1302), and the third gear (1104) is in meshed connection with a fourth gear (1202).

7. The reaction kettle for producing cellulose mixed ether according to claim 1 or 6, wherein:

the separation device comprises three liquefaction tanks which are respectively used for liquefying the ethylene oxide, the chloromethane and the dimethyl ether,

The liquefying tank comprises a first tank body (19), the inner cavity of the first tank body (19) is cuboid, a snake-shaped refrigerating pipe (23) is arranged in the inner wall of the first tank body (19) in the length direction, an inlet and an outlet of the snake-shaped refrigerating pipe (23) are penetrated to the outside of the first tank body (19) and are communicated with a pipeline of a refrigerating unit,

an air inlet pipe (24) and an air outlet pipe (25) which are communicated with the inner cavity of the first box body (19) are arranged outside the first box body (19), a liquid discharge groove (1903) is concavely arranged at the bottom of the first box body (19), a liquid discharge pipe (27) is communicated with the bottom of the liquid discharge groove (1903), the tail end of the liquid discharge pipe (27) is penetrated outside the first box body (19),

a valve is arranged on the liquid discharge groove (1903) or the liquid discharge pipe (27),

an air inlet pipe (24) of the liquefaction box for liquefying the ethylene oxide is communicated with a pressure release pipe (204) of the reaction kettle,

an exhaust pipe (25) of the liquefaction tank for liquefying the ethylene oxide is connected with an air inlet pipe (24) of the liquefaction tank for liquefying the chloromethane in a penetrating way,

an exhaust pipe (25) of the liquefied methyl chloride liquefaction tank is connected with an air inlet pipe (24) of the liquefied dimethyl ether liquefaction tank in a penetrating way,

an exhaust pipe (25) of the liquefied dimethyl ether tank is connected with the nitrogen recovery pipeline in a penetrating way.

8. The reaction kettle for producing cellulose mixed ether according to claim 7, wherein:

A piston (20) is vertically arranged in the first box body (19), the peripheral end face of the piston (20) is abutted with the inner wall of the first box body (19),

at least two screws (21) are arranged in the first box body (19) along the length direction, the screws (21) penetrate through the piston (20), the screws (21) are in threaded connection with the piston (20), one end of each screw (21) is inserted into the inner wall of the first box body (19), the other end of each screw is penetrated out of the first box body (19) and is fixedly connected with a seventh belt pulley (2101),

the first box (19) is externally fixed with a second motor (22), an output shaft of the second motor (22) is fixed with an eighth belt pulley (2201), and the eighth belt pulley (2201) is connected with all seventh belt pulleys (2101) through a same fourth synchronous belt (2202).

9. The reaction kettle for producing cellulose mixed ether according to claim 8, wherein:

the air inlet pipe (24) and the air outlet pipe (25) are connected with the side wall of one end of the first box body (19) in the length direction,

a through hole (1902) is arranged on the side wall of the other end of the first box body (19) in the length direction,

one end of the piston (20) facing the through hole (1902) is fixed with a rubber sleeve (2001), and the rubber sleeve (2001) is in threaded connection with the screw (21).

10. The reaction kettle for producing cellulose mixed ether according to claim 9, wherein:

The exterior of the liquefaction box is provided with a gas box (29), the gas box (29) comprises a second box body (2901) with an open upper end,

an elastic sealing gasket (2902) is covered at the upper opening of the second box body (2901), the elastic sealing gasket (2902) is fixedly connected with the second box body (2901) through a fixing frame (2903),

the second box body (2901) is externally connected with a test tube (2904) in a penetrating way, a stop valve is arranged on the test tube (2904),

the through hole (1902) is communicated with the second box body (2901) through a connecting air passage (30).

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