CN214810707U - Large-scale polymerization loop reactor - Google Patents
Large-scale polymerization loop reactor Download PDFInfo
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- CN214810707U CN214810707U CN202120027290.4U CN202120027290U CN214810707U CN 214810707 U CN214810707 U CN 214810707U CN 202120027290 U CN202120027290 U CN 202120027290U CN 214810707 U CN214810707 U CN 214810707U
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Abstract
The utility model relates to a large-scale polymerization loop reactor, which comprises a loop pipe body, a loop pipe body and a plurality of loop pipe bodies, wherein the loop pipe body comprises 4 straight pipes which are parallel to each other, namely a straight pipe I (1), a straight pipe II (2), a straight pipe III (3) and a straight pipe IV (4), one port of the straight pipe I (1) is a first free end, one port of the straight pipe IV (4) is a second free end, and the ports on the same side of the other adjacent straight pipes are connected through a bent pipe to form a spiral loop pipe; the straight pipe I (1), the straight pipe II (2), the straight pipe III (3) and the straight pipe IV (4) respectively comprise an inner pipe and a jacket, the jacket is sleeved on the inner pipe, a cooling water channel is arranged between the jacket and the inner pipe, the inner pipe is a reactant channel, and the inner pipes are communicated through the elbow pipe; and the cooling water pipeline is arranged between the straight pipe I (1) and the straight pipe II (2) and between the straight pipe III (3) and the straight pipe IV (4), and is communicated with the cooling water channel.
Description
Technical Field
The patent of the utility model relates to a large-scale polymerization loop reactor especially relates to polypropylene and polyethylene loop reactor.
Background
The loop reactor has been successfully applied to the polyolefin field such as polypropylene, polyethylene and the like, and is a core device in the polyolefin project. Taking the production process of polypropylene as an example, the production methods of propylene polymerization mainly include five major types, namely solution method, slurry method, bulk method, gas phase method and bulk-gas phase combined process. Among them, the gas phase process and the bulk-gas phase combined process are relatively advanced production processes and are also the main methods in the current industrialization. The main reactor of the bulk-gas phase combined process is a loop reactor, and a representative process is the Spheripol process from Lyondell basell. Due to the unique advantages of loop reactors, the Spheripol process is the most popular polypropylene production process.
The prior art has the defects of large volume, difficult control of polymerization reaction conditions, low control accuracy, uneven product quality, easy generation of hot spots, easy wall adhesion, high energy consumption of an axial flow pump and the like, and the loop reactor which solves the defects is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to meet the requirements of polypropylene production devices and provides a large-scale polymerization loop reactor which comprises a reactor body,
the ring pipe body comprises 4 straight pipes which are parallel to each other, namely a straight pipe I (1), a straight pipe II (2), a straight pipe III (3) and a straight pipe IV (4), wherein one port of the straight pipe I (1) is a first free end, one port of the straight pipe IV (4) is a second free end, and the ports of the same side of the other adjacent straight pipes are connected through a bent pipe to form a spiral ring pipe;
the straight pipe I (1), the straight pipe II (2), the straight pipe III (3) and the straight pipe IV (4) respectively comprise an inner pipe and a jacket, the jacket is sleeved on the inner pipe, a cooling water channel is arranged between the inner wall of the jacket and the outer wall of the inner pipe, the inner pipe is a reactant channel, and the inner pipes are communicated through the elbow pipe;
and the cooling water pipeline is arranged between the straight pipe I (1) and the straight pipe II (2) and between the straight pipe III (3) and the straight pipe IV (4), and is communicated with the cooling water channel.
In some embodiments, the first free end is a material pump connection port (15), the material pump connection port (15) is a material outlet, the second free end is a material inlet (26), and the material outlet is connected to a material pump.
In some embodiments, the elbow pipe is provided with a reactor safety valve interface (8), a catalyst inlet (9), a temperature measuring port (14), a pressure measuring port (16), a material discharging port (17), a reactant inlet (18), a nitrogen inlet (19) and a detection port (20).
In some embodiments, each of the jackets has expansion joints I (12) and II (24), and the expansion joints I (12) and II (24) are disposed at both ends of each of the straight pipes.
In some embodiments, each of the jackets is provided with a jacket safety valve interface (7), a cooling circulating water pump interface (11), a cooling water purification outlet (25) and a cooling water inlet (27).
In some embodiments, 4 of the straight tubes are fitted with an annular seat (23) for securing the straight tubes to a component.
In some embodiments, the top region of the jacket (21) is provided with a jacket vent (5).
In some embodiments, the II expansion joint (24) is disposed proximate to the cooling water inlet (27).
In some embodiments, a section steel support (13) is arranged among the straight pipes I (1), II (2), III (3) and IV (4).
Has the advantages that:
1. the loop reactor has high space-time yield of the reactor, small volume of the reactor and low investment.
2. The reactor has simple structure, low material requirement, low temperature carbon steel and simple design and manufacture.
3. The straight leg part of the reactor with the jacket can be used as a support column of the reactor frame, and the structural design reduces the investment.
4. Because the reactor volume is small, the residence time is short, the product switching is fast, and the transition material is few.
5. The polymer particles are suspended in the propylene liquid and there is good heat transfer between the polymer and the propylene. And a cooling jacket is adopted, so that the heat transfer area of unit volume is large, and the heat transfer coefficient is large.
6. The slurry in the loop reactor is circulated at a high speed by an axial flow pump, thereby allowing the polymer to be polymerized
The slurry is stirred uniformly, the catalyst system is distributed uniformly, the polymerization reaction condition is easy to control and can be controlled very accurately, the product quality is uniform, hot spots are not easy to generate, the wall is not easy to stick, and the energy consumption of the axial flow pump is lower.
7. The concentration of the polymer slurry in the reactor is high, and the conversion per pass of the reactor is high.
Drawings
FIG. 1 is a schematic view of the overall structure of a large-scale polymerization loop reactor.
FIG. 2 is a schematic cross-sectional view of a large polymerization loop reactor.
Fig. 3 is a partial schematic view of portion I of fig. 2.
Reference numerals:
straight pipe I1
Straight pipe II 2
Straight tube III 3
Straight tube IV 4
Jacket exhaust port 5
Elbow pipe 6
Jacket safety valve interface 7
Safety valve interface 8
Catalyst inlet 9
Cooling circulating water pump interface 11
Expansion joint I12
Material discharging port 17
Nitrogen inlet 19
Expansion joint II 24
Cooling water purge port 25
Cooling water inlet 27
Detailed Description
The present invention will be described with reference to the accompanying drawings.
The utility model relates to a large-scale polymerization loop reactor designed according to the requirements and future trends of the current polymerization production. FIG. 1 is a schematic view of the overall structure of a large-scale polymerization loop reactor. FIG. 2 is a schematic cross-sectional view of a large polymerization loop reactor. Fig. 3 is a partial schematic view of portion I of fig. 2. The polymerization loop reactor comprises: the cooling water pipe comprises an annular pipe body and a cooling water pipeline 10, wherein the annular pipe body comprises 4 parallel straight pipes, namely a straight pipe I1, a straight pipe II 2, a straight pipe III 3 and a straight pipe IV 4, wherein one port of the straight pipe I1 is a first free end, and one port of the straight pipe IV 4 is a second free end; the ports of the other adjacent straight pipes on the same side are connected through an elbow pipe 6 to form a spiral ring pipe; the straight pipe I1, the straight pipe II 2, the straight pipe III 3 and the straight pipe IV 4 respectively comprise an inner pipe 22 and a jacket 21, the jacket 21 is sleeved on the inner pipe 22, a space between the inner wall of the jacket 21 and the outer wall of the inner pipe 22 is a cooling water channel 10, the inner pipe 22 is a reactant channel, and the inner pipes 22 are communicated through the elbow pipe 6; and the cooling water pipelines are arranged between the straight pipe I1 and the straight pipe II 2 and between the straight pipe III 3 and the straight pipe IV 4 and are communicated with the cooling water channel. The loop reactor is a circulating whole formed by connecting a plurality of straight pipes, an external jacket 21 and a plurality of 180-degree elbow pipes in sequence.
Referring to fig. 2, fig. 2 is a schematic cross-sectional view of a large polymerization loop reactor. In the figures, the ends marked by the same letters from L1 to L4 are connected, for example, the end of the mark L1 is connected with the end of the mark L1, and the end of the mark L3 is connected with the end of the mark L3, as shown in fig. 2, a reactor safety valve interface 8, a catalyst inlet 9, a temperature measuring port 14, a pressure measuring port 16, a material exhaust port 17, a reactant inlet 18, a nitrogen inlet 19 and a detection port 20 are arranged on the elbow pipe 6. Each jacket 21 is provided with a jacket safety valve interface 7, a cooling circulating water pump interface 11, a cooling water purification outlet 25 and a cooling water inlet 27. The jacket 21 is provided with a jacket safety valve interface 7, a cooling circulating water pump interface 11, a cooling water purification outlet 25 and a cooling water inlet 27. The first free end is a material pump connecting port 15, the material pump connecting port 15 is a material outlet, the second free end is a material inlet 26, and the material outlet is connected with a material pump.
The loop reactor is provided with a jacket exhaust port 5 at the top area of the jacket 21, so that bubbles generated in the jacket 21 are prevented from influencing the cooling efficiency.
An expansion joint I12 is designed at the top of a jacket of the loop reactor, and an expansion joint II 24 is installed at a cooling water inlet 27 close to the bottom of a straight pipe and used for compensating thermal expansion caused by inconsistent temperature of the inner pipe and the outer pipe.
And a section steel support 13 is arranged among the straight pipe I1, the straight pipe II 2, the straight pipe III 3 and the straight pipe IV 4 of the loop reactor, so that the overall strength of the loop reactor is enhanced. The section steel support 13 can be an I-beam, and straight pipes are connected through the I-beam to form a plurality of platform surfaces, and the platform surfaces not only serve as the function of fixing the whole loop reactor, but also serve as installation platforms of other auxiliary devices of a polypropylene system.
A plurality of temperature measuring ports 14 and pressure measuring ports 16 are arranged on the loop reactor, and the temperature and pressure changes of the equipment during operation are monitored in real time. The reactor safety valve interface 8 and the jacket safety valve interface 7 are used for ensuring
The bottom area of the loop reactor is provided with a material discharge port 17, an inspection port 18 and a nitrogen inlet 19 which are used for working conditions when equipment is started and stopped. The drain port 17 is convenient for removing residual materials, the reactant inlet 18 is used for adding reactants into the loop reactor, the nitrogen inlet 19 is used for gas replacement before starting the equipment, and the nitrogen inlet 19 can also be used as a cooling water inlet. The inspection port 20 of the loop reactor allows inspection of the polymerization reactants for material properties. The loop reactor is supported by an annular support 23. The feed opening 26 and the cooling water inlet 27 are located in the bottom region of the loop reactor. The cooling circulating water pump interface 11 is connected with a water pump, the material pump connector 15 is connected with a material pump, and materials and cooling water in the equipment run by the water pump and the material pump to circulate.
The use of the loop reactor is described in detail below:
when the device is operated, firstly, nitrogen enters the device from a nitrogen inlet 19 to replace the air in the device, after the replacement is completed, cooling water is introduced from a cooling water inlet, after the circulation is stable, a reactant is added from a reactant inlet 18, a circulating pump is started to enable the reactant to circularly operate in an annular pipe, the operation sequence is that a straight pipe I1, a straight pipe II 2, a straight pipe III 3, a straight pipe IV 4 and a straight pipe I1 are arranged, a catalyst inlet 9 is designed on an elbow 6 of the annular pipe reactor, and the catalyst can be ensured to be uniformly added into the reactor. The reactants are subjected to a circulating reaction in the loop reactor under the action of the material pump, the reaction is an exothermic reaction, so that the jacket cooling water also needs to be circulated, and the stable operation temperature of the equipment is ensured. And after the reactants circularly run in the loop pipe to meet the requirement, the reactants are discharged from a material pump connecting port 15 and enter the next working section.
The loop reactor has the beneficial effects that:
1. the loop reactor has high space-time yield of the reactor, small volume of the reactor and low investment.
2. The reactor has simple structure, low material requirement, low temperature carbon steel and simple design and manufacture.
3. The straight leg part of the reactor with the jacket can be used as a support column of the reactor frame, and the structural design reduces the investment.
4. Because the reactor volume is small, the residence time is short, the product switching is fast, and the transition material is few.
5. The polymer particles are suspended in the propylene liquid and there is good heat transfer between the polymer and the propylene. And a cooling jacket is adopted, so that the heat transfer area of unit volume is large, and the heat transfer coefficient is large.
6. The slurry in the loop reactor is circulated at a high speed by an axial flow pump, thereby allowing the polymer to be polymerized
The slurry is stirred uniformly, the catalyst system is distributed uniformly, the polymerization reaction condition is easy to control and can be controlled very accurately, the product quality is uniform, hot spots are not easy to generate, the wall is not easy to stick, and the energy consumption of the axial flow pump is lower.
7. The concentration of the polymer slurry in the reactor is high, and the conversion per pass of the reactor is high.
Claims (9)
1. A large scale polymerization loop reactor, comprising,
the ring pipe body comprises 4 straight pipes which are parallel to each other, namely a straight pipe I (1), a straight pipe II (2), a straight pipe III (3) and a straight pipe IV (4), wherein one port of the straight pipe I (1) is a first free end, one port of the straight pipe IV (4) is a second free end, and the ports of the same side of the other adjacent straight pipes are connected through a bent pipe to form a spiral ring pipe;
the straight pipe I (1), the straight pipe II (2), the straight pipe III (3) and the straight pipe IV (4) respectively comprise an inner pipe and a jacket, the jacket is sleeved on the inner pipe, a cooling water channel is arranged between the inner wall of the jacket and the outer wall of the inner pipe, the inner pipe is a reactant channel, and the inner pipes are communicated through the elbow pipe;
and the cooling water pipeline is arranged between the straight pipe I (1) and the straight pipe II (2) and between the straight pipe III (3) and the straight pipe IV (4), and is communicated with the cooling water channel.
2. Large scale polymerization loop reactor according to claim 1, comprising that the first free end is a material pump connection (15), that the material pump connection (15) is a material outlet, that the second free end is a material inlet (26), and that the material outlet is connected to a material pump.
3. The large-scale polymerization loop reactor according to claim 1, wherein the elbow pipe is provided with a reactor safety valve interface (8), a catalyst inlet (9), a temperature measuring port (14), a pressure measuring port (16), a material discharging port (17), a reactant inlet (18), a nitrogen inlet (19) and a detection port (20).
4. A large polymerization loop reactor according to claim 1 wherein each of said jackets has expansion joints i (12) and ii (24), said expansion joints i (12) and ii (24) being provided at both ends of each of said straight pipes.
5. The large-scale polymerization loop reactor according to claim 4, wherein each jacket is provided with a jacket safety valve interface (7), a cooling circulating water pump interface (11), a cooling water purge outlet (25) and a cooling water inlet (27).
6. A large polymerization loop reactor according to claim 1, characterized in that 4 of said straight pipes are fitted with annular supports (23) for fixing said straight pipes to a component.
7. Large polymerization loop reactor according to claim 1, characterized in that the top area of the jacket (21) is provided with a jacket exhaust (5).
8. Large scale polymerization loop reactor according to claim 5, characterized in that the expansion joint II (24) is placed close to the cooling water inlet (27).
9. The large-scale polymerization loop reactor according to claim 1, wherein a section steel support (13) is arranged among the straight pipe I (1), the straight pipe II (2), the straight pipe III (3) and the straight pipe IV (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120027290.4U CN214810707U (en) | 2021-01-06 | 2021-01-06 | Large-scale polymerization loop reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120027290.4U CN214810707U (en) | 2021-01-06 | 2021-01-06 | Large-scale polymerization loop reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214810707U true CN214810707U (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120027290.4U Active CN214810707U (en) | 2021-01-06 | 2021-01-06 | Large-scale polymerization loop reactor |
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|---|---|
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2021
- 2021-01-06 CN CN202120027290.4U patent/CN214810707U/en active Active
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