CN100482692C - Agitator of polymerizer for producing PVC resin paste by emulsion polymerization - Google Patents

Abstract

The agitator used for the emulsion polymerization to produce polyvinyl chloride paste resin polymerization kettle, including the polymerization kettle and the agitator, the agitator is installed in the polymerization kettle, the agitator includes the stirring shaft, the ring-type stirring paddle, and the stirring shaft is hollow , the stirring shaft is equipped with a ring-type stirring paddle, the agitator is provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet and cooling water outlet are sealed with PTFE packing; the diameter of the ring-type stirring paddle of the agitator is the same as that of the kettle body The diameter ratio is 0.45-0.50:1, the angle between the center line of the ring tube of the agitator's ring tube type impeller and the stirring shaft is 3-5°, the ring tube type impeller and the stirring shaft pass through the detachable countersunk head Screw connection, cooling water flow port is set at the connection between the lower part of the stirring shaft and the ring-type stirring paddle. The advantages of the present invention are: adopting the ring-tube type agitator with the optimal paddle-diameter ratio improves the mixing and heat transfer effect, especially the agitator with an inclination angle makes the mixing and heat transfer effect higher, thereby improving the efficiency of polyvinyl chloride paste. Resin quality and polymerizer capacity.

Description

Stirrer for polyvinyl chloride paste resin polymerization kettle for emulsion polymerization

technical field

The invention relates to a stirrer for a polymerization tank, in particular to a stirrer for a polymerization tank for producing polyvinyl chloride paste resin by emulsion polymerization.

Background technique

The agitator is the most critical part of the polymerization kettle, which directly affects the reaction speed, heat transfer rate and product quality of chemical materials in the kettle.

The production of polyvinyl chloride paste resin in my country began in the late 1980s, using the emulsion polymerization production process of Japan Zhongyuan Company. So far, there are few paste resin production enterprises with small scale and outdated production technology. Now the demand for polyvinyl chloride paste resin continues to increase, and the upper and lower temperatures are uneven, resulting in low production capacity of the polymerization kettle. Shenyang Chemical Industry Co., Ltd. urgently needs to carry out technical transformation and equipment renewal on the paste resin polymerization kettle, so as to achieve the economic purpose of high production capacity and high benefit. The polyvinyl chloride paste resin production enterprises represented by Shenhua and Tianhua are expanding their scale and undergoing technical transformation, and a batch of new paste resin production enterprises are under construction.

Therefore, the improved agitator and the development of a new type of agitator to produce a high-quality and efficient polymerization kettle will surely produce huge economic and social benefits.

Jinxi Chemical Machinery (Group) Co., Ltd. has the only mixing test laboratory among domestic enterprises. It can use advanced testing methods such as laser velocimeters to carry out scientific experiments. It has completed a large number of mixing test research projects and accumulated a lot of practical experience. With the ability to develop. Jinxi Chemical Machinery (Group) Co., Ltd. has developed the LF series of large polymerization kettles for the production of polyvinyl chloride paste resin by emulsion polymerization.

Contents of the invention

The technical problem to be solved by the present invention is to provide an agitator for a polyvinyl chloride paste resin polymerization tank with high heat transfer efficiency and high agitation strength for emulsion polymerization.

The technical solutions adopted are:

The agitator used for the production of polyvinyl chloride paste resin polymerization kettle by emulsion polymerization includes a stirring shaft and a ring-type stirring paddle. A stirrer is installed in the polymerization kettle. The stirring shaft is hollow and a ring-type stirring shaft is installed on the stirring shaft Stirring paddle, the inside of the stirrer is fed with circulating cooling water, the stirrer is equipped with a cooling water inlet and a cooling water outlet, and the cooling water inlet and cooling water outlet are sealed with polytetrafluoroethylene packing; The diameter ratio is 0.45-0.50:1, which is conducive to improving the stirring strength and heat transfer effect; the angle between the centerline of the ring tube of the ring tube type stirring impeller of the agitator and the stirring shaft is 3-5°, which strengthens the The axial flow of the fluid is improved, which is conducive to improving the mixing effect and heat transfer effect; the ring-type stirring impeller and the stirring shaft are connected by detachable countersunk screws, which is convenient for installation and maintenance, does not affect the flow of materials, and is not easy to scale; A cooling water flow port is provided at the joint between the lower part of the stirring shaft and the annular stirring paddle.

The above-mentioned polymerization kettle includes a kettle body and a transmission device. The volume of the kettle body is 40-150 cubic meters, the aspect ratio is 2.5-3.5, the height is 8-30 meters, and the nominal diameter is 2-5 meters. Spiral half-pipe jacket, the bottom of the kettle body is fixed with a spiral diversion jacket; a quick-opening manhole with an interlock device is designed on the top of the kettle body; the bottom of the above-mentioned kettle body is equipped with a bottom bearing, and the bottom bearing has an adjustable eccentric structure. It can also play the role of supporting the stirring shaft, and a transmission device is installed on the upper part of the kettle body.

The above-mentioned transmission device includes electric motor, reducer, frequency conversion speed control device, mechanical seal, oil station, the direct connection form is adopted between the motor and the reducer, and the motor is connected with frequency conversion speed control device to realize the speed regulation of equipment operation; A reducer, motor, and upper bearing box are installed, the reducer is connected with the chain connector, and a mechanical seal is installed on the top of the kettle body, which is connected with an oil station to provide circulating mechanical oil for sealing and cooling.

The advantage of the present invention is: adopting the ring-tube type agitator with the optimal paddle-diameter ratio improves the stirring mixing and heat transfer

The effect, especially the agitator with an inclination angle, makes the agitation mixing and heat transfer effect higher, thereby improving the quality of the PVC paste resin and the productivity of the polymerization tank.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an agitator according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of an agitator structure of an embodiment of the present invention

Detailed ways

Embodiment one

The agitator used for emulsion method polymerization to produce polyvinyl chloride paste resin polymerization kettle, agitator 15 includes agitator shaft 18, annular pipe type agitator paddle 17, agitator 15 is installed in polymerization kettle 1, agitator shaft 18 is hollow type, A ring-type stirring paddle 17 is installed on the stirring shaft 18. The inside of the stirrer 15 is fed with circulating cooling water. The stirrer 15 is provided with a cooling water inlet 12 and a cooling water outlet 11. Fluorine packing seal 10; the ratio of the diameter of the ring-type stirring paddle 17 of the agitator 15 to the diameter of the kettle body 2 is 0.48:1, and the clamp between the center line of the ring pipe of the ring-type stirring paddle 17 of the agitator 15 and the stirring shaft 18 The angle is 3°; the ring-type stirring paddle 17 and the stirring shaft 18 are connected by detachable countersunk screws 22; the lower part of the stirring shaft 18 and the ring-type stirring paddle 17 are connected with a cooling water flow port 21;

The above-mentioned polymerization kettle includes a kettle body 2 and a transmission device 4. The volume of the kettle body 2 is 48 cubic meters, the aspect ratio is 2.8, the height is 15 meters, and the nominal diameter is 2.68 meters. The outer wall of the straight section of the kettle body 2 is fixed with a spiral half pipe clamp. Cover 16, the bottom of the kettle body 2 is fixed with a spiral diversion jacket 19; the top of the kettle body 2 is provided with a quick-opening hole 14 of an interlock device; the bottom of the above-mentioned kettle body 2 is equipped with a bottom bearing 20, and the bottom bearing 20 It has an adjustable eccentric structure; a transmission device 4 is installed on the upper part of the kettle body 2 mentioned above.

The above-mentioned transmission device 4 includes a motor 6, a reducer 7, a frequency conversion speed control device 5, a mechanical seal 13, and an oil station 3. The motor 6 and the reducer 7 adopt a direct connection form, and the reducer 7 is connected with a chain connector 8. The motor 6 is connected with a frequency conversion speed regulating device 5; a reducer 7, a motor 6, and an upper bearing box 9 are installed on the transmission frame 23, and a mechanical seal 13 is installed on the top of the kettle body 2, and the mechanical seal 13 is connected with the oil station 3.

Embodiment two

Embodiment 2 is basically the same as Embodiment 1, except that the ratio of the diameter of the ring-type stirring paddle 17 of the stirrer 15 to the diameter of the kettle body 2 is 0.45:1, and the center of the ring pipe of the ring-type stirring paddle 17 of the stirrer 15 is 0.45:1. The angle between the line and the central line of the stirring shaft 18 is 4°;

The kettle body 2 has a volume of 130 cubic meters, an aspect ratio of 2.6, a height of 30 meters, and a nominal diameter of 4.0 meters.

Claims (3)

1. The agitator used for the production of polyvinyl chloride paste resin polymerization kettle by emulsion polymerization, including the stirring shaft (18) and the ring-type stirring paddle (17), is characterized in that: the agitator (15) is installed in the polymerization kettle (1 ), the stirring shaft (18) is hollow, the stirring shaft (18) is equipped with a ring-type stirring paddle (17), and the stirrer (15) is provided with a cooling water inlet (12) and a cooling water outlet (11), The cooling water inlet (12) and the cooling water outlet (11) are sealed with polytetrafluoroethylene packing (10); the diameter ratio of the annular stirring paddle (17) of the agitator (15) to the diameter of the kettle body (2) is 0.45-0.50 : 1, the included angle between the ring tube centerline of the ring tube type stirring paddle (17) of agitator (15) and the stirring shaft (18) center line is 3-5 °, and the ring tube type stirring paddle (17) and The stirring shaft (18) is connected by a detachable countersunk screw (22), and a cooling water flow port (21) is arranged at the connection between the lower part of the stirring shaft (18) and the ring-type stirring paddle (17). 2. The agitator for the polyvinyl chloride paste resin polymerization tank for producing polyvinyl chloride paste resin by emulsion polymerization according to claim 1, characterized in that: the polymerization tank (1) includes a tank body (2), a transmission device (4) , the volume of the kettle body (2) is 40-150 cubic meters, the aspect ratio is 2.5-3.5, the height is 8-30 meters, and the nominal diameter is 2-5 meters. The outer wall of the straight section of the kettle body (2) is fixed with a spiral half-pipe The jacket (16), the bottom of the kettle body (2) is fixed with a spiral diversion jacket (19), and the top of the kettle body (2) is provided with a quick-opening manhole (14) with an interlock device, and the kettle body (2) Bottom bearing (20) is equipped with at the bottom, and this bottom bearing (20) has adjusting eccentric structure, and transmission device (4) is installed on kettle body (2) top. 3. The agitator for producing polyvinyl chloride paste resin polymerization kettle by emulsion polymerization according to claim 2, characterized in that: the transmission device (4) includes a motor (6), a reducer (7), The frequency conversion speed regulating device (5), the mechanical seal (13), the oil station (3), the electric motor (6) and the reducer (7) are directly connected, and the reducer (7) is connected with the chain connector (8). The motor (6) is connected with a frequency conversion speed regulating device (5), and a reducer (7), a motor (6), and an upper bearing box (9) are installed on the transmission device frame (23), and on the top of the kettle body (2) A mechanical seal (13) is installed, and the mechanical seal (13) is connected with the oil station (3).

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