CN117816059A - Reactor with internal cooling tube in guide cylinder - Google Patents

Abstract

The invention relates to a reactor with an internal cooling pipe in a guide cylinder, which adopts a special structural design, is suitable for a kettle type reactor for a polymerization system reaction with high reaction rate, quick viscosity increase, short residence time, high heat release intensity and large heat exchange area in the polymerization reaction of a high polymer material, ensures that materials are fully mixed in a short time, has no dead angle in the reactor, and can rapidly remove reaction heat. The device mainly comprises: the device comprises an upper flange cover, an upper guide ring, a hyperboloid seal head, a U-shaped inner cooling pipe, a guide cylinder, an evaporator tube array, a fixed guide plate, a stirrer assembly, a lower seal head, a lower flange cover and the like. The catalyst and the material enter from the pipe orifice of the lower end enclosure, are pushed by the stirrer assembly, go upward through the guide cylinder, and then go downward from the surrounding tube array to complete circulation. The refrigerant takes heat away from the inside of the U-shaped inner cooling pipe and the outside of the surrounding tube array. And discharging one part of the reacted polymer from the pipe orifice of the upper end socket, and mixing and reacting the other part of the downlink polymer with the new material again.

Description

Reactor with internal cooling tube in guide cylinder

Technical field:

the invention relates to a reactor with an internal cooling tube in a guide cylinder, which is suitable for a reactor with large heat exchange area and rapid heat removal in the material reaction process and is special equipment in the polymer material reaction.

Technical background:

the reactor which needs large heat exchange area and rapidly removes heat in the reaction process of the polymer material has three structures selected at home and abroad: 1. the middle of the reactor adopts an evaporator structure, a push-type stirrer is added in a guide cylinder in the middle of the evaporator, and the heat exchange area in the middle guide cylinder is small, so that the temperature in the flow cylinder is uneven, the reaction heat cannot be withdrawn, and the product quality is affected. 2. The reactor is internally provided with a plurality of groups of heat exchange tube bundles and is provided with a plurality of layers of radial flow stirrers, the tube bundles are easy to glue, the tube bundles need to be cleaned regularly, and once leakage repair difficulty is high. 3. In the structure of the two-compartment fixed tube-plate type tube-array heat exchanger, the tube array in the middle area is shorter than the tube bundle in the outer tube array area, a push-type stirrer is arranged in the space, and reactants flow upwards from the tube array in the middle area through axial flow and form annular flow under the outer tube array area. The refrigerant outside the tube array takes away heat.

Problems to be solved: the reaction kettle with a new structure is selected, the heat exchange area is increased, an efficient push-type stirrer is adopted, the number of paddles is increased, the reasonable rotating speed is selected, the flowing dead zone is reduced, the circulation speed in the kettle is increased, solid particles are reduced, the mass transfer and heat transfer structures are enhanced, the excellent microcosmic mixing performance is realized, the process of rapidly polymerizing the high polymer material is completed, and the running time of the polymerization kettle is prolonged.

The invention comprises the following steps:

the invention relates to a reactor with an internal cooling pipe in a guide cylinder, which is characterized in that: the device comprises an upper flange cover (1) with a flow guiding element, an upper flow guiding ring (2), a hyperboloid end socket (3), a U-shaped inner cooling pipe (4), a flow guiding cylinder (5), an evaporator tube array (6), a fixed guide plate (7), a lower end socket (9), a lower flow guiding element, a mechanical sealing assembly (10) and the like.

A reactor with an internally cooled tube in a guide shell, characterized by: materials, solvents and catalysts enter from a hyperboloid end socket under the high-efficiency axial-flow type polymerization reaction kettle, the materials and catalyst feed pipes directly extend into the lower part of a stirrer, the stirrer sucks the materials and the catalysts, the materials and the catalysts are quickly and fully mixed under the pushing of stirring strength and are pushed out of the stirrer upwards, the materials and the catalysts flow upwards from the inside of a guide cylinder (5) and the outside of a U-shaped inner cooling pipe (4), the polymerization reaction is completed in the annular flow of a part of polymers under the guide flow of an upper guide ring (2) in the hyperboloid end socket (3), and the polymers are discharged from the pipe orifice of the upper end socket, so that the materials and the catalysts are uniformly distributed, and qualified products are produced. The other part of the mixed material flows downwards in the reactor through the tube of the evaporator tube array (6) and returns to the lower part of the stirrer to be mixed with the feed, and then flows circularly from bottom to top again to form a rapid circulation, and the rapid circulation reacts with the new feed again and is mixed with the new feed. The refrigerant in the U-shaped inner cooling pipe (4) and outside the evaporator tube array (6) takes heat in the flow. So as to meet the continuous polymerization process of the high polymer material.

A reactor with an internally cooled tube in a guide shell, characterized by: the fixed guide plate (7) is arranged in the guide cylinder (5) above the stirrer blade, a gap is reserved between the guide cylinder and the stirrer blade, and the fixed guide plate is distributed at the lower part of the guide cylinder and the U-shaped inner cooling tube (4) and is supported by the U-shaped inner cooling tube (4), so that the glue mass larger than the gap can be crushed.

A reactor with an internally cooled tube in a guide shell, characterized by: the propelling type stirring system adopts standard propeller blades, the number of the blades of the stirrer assembly (8) is 5-15 blades of the propelling type stirrer, and the rotating speed range of the stirrer is 300-855 rpm. The impeller rotates at high speed to generate stable high-speed flow, so that solid particles are reduced, mass transfer and heat transfer structures are enhanced, and the micro-mixing performance is excellent, and enough thrust and stable and uniform distribution are formed in the guide cylinder. The optimal conveying amount and the minimum flow resistance can be obtained, and no vortex flow and cavitation bubbles are generated. The flow clusters are well separated and flow on the molecular scale, the reaction kinetic process is promoted, the process of rapid polymerization of the high-molecular polymer is completed, and the running time of the polymerization kettle is prolonged.

A reactor with an internally cooled tube in a guide shell, characterized by: the flow area in the guide cylinder reduces the area of the U lower pipe and the flow area of the surrounding tube array to ensure that the flow velocity of the materials in the polymerization kettle is the same, and the flow dead zone is reduced.

Drawings

FIG. 1 is a block diagram of a reactor with cooling tubes added to the evaporator guide shell.

An upper flange cover (1) with a flow guiding element, an upper flow guiding ring (2), a hyperboloid end socket (3), a U-shaped inner cooling pipe (4), a flow guiding cylinder (5), an evaporator tube array (6), a fixed guide plate (7), a stirrer assembly (8), a lower end socket (9), a lower flow guiding element and a mechanical sealing assembly (10)

Detailed Description

1.U, the inner cooling pipe (4) and the guide cylinder (5) are firstly fixed with holes according to the design requirement.

2. The fixed guide plate (7) is arranged in the guide cylinder (5) above the stirrer blade, is supported by the U-shaped inner cooling tube (4), is spaced from the stirrer blade, is distributed at the lower parts of the guide cylinder and the U-shaped inner cooling tube (4), is supported by the U-shaped inner cooling tube (4), and can crush the micelle larger than the gap.

3. The inlet type stirring system adopts standard screw surface paddles, and the number of paddles is 5-15.

4. The rotational speed of the stirrer ranges from 300 rpm to 855rpm. The impeller rotates at high speed to generate stable high-speed flow, so that solid particles are reduced, mass transfer and heat transfer structures are enhanced, and the micro-mixing performance is excellent, and enough thrust and stable and uniform distribution are formed in the guide cylinder. The optimal conveying amount and the minimum flow resistance can be obtained, and no vortex flow and cavitation bubbles are generated. The flow clusters are well separated and flow in molecular size, the reaction kinetic process is promoted, the process of rapid polymerization of the high-molecular polymer is completed, and the running time of the polymerization kettle is prolonged.

5. The flow area in the guide cylinder reduces the area of the U lower pipe and the flow area of the surrounding tube array to ensure that the flow velocity of the materials in the polymerization kettle is the same, and the flow dead zone is reduced.

Claims (6)

1. A reactor with an internal cooling tube in a guide cylinder, which is characterized by mainly comprising: the device comprises an upper flange cover (1) with a flow guiding element, an upper flow guiding ring (2), a hyperboloid end socket (3), a U-shaped inner cooling pipe (4), a flow guiding cylinder (5), an evaporator tube (6), a fixed guide plate (7), a stirrer assembly (8), a lower end socket (9), a lower flow guiding element, a mechanical sealing assembly (10) and the like. Catalyst, solvent and materials enter from an inlet of a lower seal head (10), the materials are pushed by high-speed rotation of a stirrer assembly (9), and go up to the hyperboloid seal head (3) through the inside of a guide cylinder (5) and the outside of a U-shaped inner cooling pipe (4), one part of reactants are discharged from an upper pipe orifice, and the other part of reactants go down in an evaporator tube (6) to form a rapid circulation in the reactor, and react and mix with the new materials again. The refrigerant in the U-shaped inner cooling pipe (4) and outside the evaporator tube array (6) takes heat in the flow. So as to meet the technological requirements of polymerization of high polymer materials.

2. The reactor with the internal cooling tube in the guide cylinder according to claim 1, wherein the U-shaped cooling tube (4) is added in the guide cylinder in the evaporator structure, so that the heat exchange area is enlarged, and the heat removal is facilitated.

3. A reactor with internal cooling tubes in a guide shell according to claim 1, characterized in that the blades of the stirrer assembly (8) are 5-15 blade propeller stirrers with stirrer speeds in the range 300-855 rpm. The strong stirring system, stable and high-speed axial flow, ensures that the materials complete the circumferential circulation and micromixing in the reactor within 1-5 seconds, reduces the chain growth in the polymerization reaction, and is beneficial to the molecular weight and molecular weight distribution of the polymerization product.

4. A reactor with cooling tubes added to the guide shell in the evaporator structure according to claim 1, characterized in that the catalyst, the mixed feed and the stirring system are arranged on the reactor bottom head (10) so that the catalyst and the mixed feed enter the reactor and are rapidly mixed under the stirring of the high-speed axial flow of the stirring system.

5. The number of the U-shaped internal cooling pipes (4) added to the guide cylinder according to claim 2 is 60-120, and the ratio of the diameter of the guide cylinder (5) to the diameter of the kettle body is 0.43-0.6.

6. The flow area in the guide cylinder reduces the area of the U lower pipe and the flow area of the surrounding tube array to ensure that the flow velocity of the materials in the polymerization kettle is the same, and the flow dead zone is reduced.