CN216499225U - Production device of 2-methylpyridine - Google Patents
Production device of 2-methylpyridine Download PDFInfo
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- CN216499225U CN216499225U CN202122940195.6U CN202122940195U CN216499225U CN 216499225 U CN216499225 U CN 216499225U CN 202122940195 U CN202122940195 U CN 202122940195U CN 216499225 U CN216499225 U CN 216499225U
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Abstract
The utility model belongs to the technical field of chemical product production, and particularly relates to a production device of 2-methylpyridine, which comprises a primary reactor, a secondary reactor, a buffer tank, a gas-solid separator and a flash cooler; the raw material inlet of the first-stage reactor is connected with the pump outlet of the reaction raw material tank, and the catalyst inlet of the first-stage reactor is connected with the pump outlet of the catalyst storage tank; the bottom outlet of the first-stage reactor is connected with the bottom inlet of the second-stage reactor, and the top exhaust port of the second-stage reactor is connected with the inlet of the buffer tank; the bottom of the secondary reactor is provided with a slag discharge port connected with a waste liquid inlet of the buffer tank; the upper outlet of the buffer tank is connected with the inlet of the gas-solid separator, the bottom outlet of the gas-solid separator is connected with the waste residue section of the buffer tank, the bottom of the buffer tank is provided with a residue discharge port, and the residue discharge port at the bottom of the buffer tank is connected with the transfer box. The device is rational in infrastructure, and production is high-efficient, excellent in use effect.
Description
Technical Field
The utility model belongs to the technical field of chemical product production, and particularly relates to a production device of 2-methylpyridine.
Background
The existing processing production device for producing 2-methylpyridine generally introduces raw materials and a catalyst into a tubular reactor (a bubble column), mixes and reacts in the reactor, and under the action of high temperature and pressure, acetylene gas is decomposed to generate carbon black and hydrogen or benzene is synthesized by cyclization, and other heavy components are generated under the action of the catalyst, so that a distribution plate is blocked, the inlet pressure is overhigh, the parking clearance or production accidents are caused, the production efficiency is influenced, and the production cost is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a production device of 2-methylpyridine, which has the advantages of reasonable structure, high production efficiency and good use effect.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a production device of 2-methylpyridine comprises a primary reactor, a secondary reactor, a buffer tank, a gas-solid separator and a flash cooler;
the raw material inlet of the first-stage reactor is connected with the outlet of the reaction raw material tank, and the catalyst inlet of the first-stage reactor is connected with the outlet of the quantitative pump of the catalyst storage tank; the bottom outlet of the first-stage reactor is connected with the bottom inlet of the second-stage reactor, and the top exhaust port of the second-stage reactor is connected with the inlet of the buffer tank; the bottom of the secondary reactor is provided with a slag discharge port connected with a waste liquid inlet of the buffer tank; an outlet at the upper part of the buffer tank is connected with an inlet of the gas-solid separator, an outlet at the bottom of the gas-solid separator is connected with an inlet of a waste residue section of the buffer tank, a residue discharge port is arranged at the bottom of the buffer tank, and the residue discharge port at the bottom of the buffer tank is connected with the transfer box;
the gas outlet of the gas-solid separator is connected with the inlet of the flash cooler, the gas outlet of the flash cooler is connected with the recovery system, and the product outlet of the flash cooler is connected with the next working section;
the middle part of the first-stage reactor is provided with a packing layer, and a raw material distributor is arranged at a raw material inlet of the first-stage reactor;
the bottom of the secondary reactor is provided with a pore plate distributor, the upper part of the secondary reactor is provided with a reflux distribution plate, the middle part of the secondary reactor is provided with a self-flowing stirrer, and a heat exchanger is arranged outside the secondary reactor.
Further, the reaction raw material tank is an acetylene compressor and an acetonitrile raw material tank.
Preferably, a temperature sensor and a pressure sensor are arranged in the primary reactor.
Preferably, a temperature sensor, a pressure sensor and a liquid level sensor are arranged in the secondary reactor.
A process for the production of 2-methylpyridine, comprising the steps of:
1) the reaction raw materials acetylene and acetonitrile enter a first-stage reactor through a raw material distributor; catalyst continuously enters the primary reactor from the lower part of the primary reactor through a quantitative pump from a catalyst storage tank; the mixed solution enters a secondary reactor from a discharge port at the bottom of the primary reactor;
2) the mixed liquid entering the secondary reactor firstly passes through a pore plate distributor, then under the action of pressure difference, the mixed liquid pushes a self-flow stirrer to rotate, and then the reaction is stably carried out through a reflux distribution plate at the upper part of the stirrer;
3) the mixed gas after reaction enters a buffer tank through an exhaust port at the upper part of a secondary reactor to primarily separate gas, solid and liquid, a heating section is arranged at the middle part of the buffer tank to vaporize the liquid, the gas and the entrained partial solid enter a gas-solid separator through an upper outlet of the buffer tank, the solid is precipitated at the bottom of the buffer tank and is discharged into a transfer box through a slag discharge port at the bottom of the buffer tank;
4) gas entering the gas-solid separator and part of entrained solids realize gas-solid separation, solid waste residues are continuously discharged to the bottom of the buffer tank through a bottom outlet of the gas-solid separator and are discharged into the transfer box along with a slag discharge port at the bottom; the gas enters a flash cooler;
5) and (3) condensing the gas in the flash cooler to perform gas-liquid separation, allowing unreacted acetylene and non-condensable gas to enter a recovery system for reuse, and allowing condensed acetonitrile and 2-methylpyridine to enter the next working section.
Preferably, in the first-stage reactor, the reaction temperature is controlled to be 50-150 ℃ and the pressure is controlled to be 0.6-2.0 Mp.
Preferably, in the secondary reactor, the reaction temperature is controlled at 190 ℃ and the pressure is controlled at 0.6-2.0 Mp.
The utility model relates to a reaction production processing device of 2-methylpyridine. The device comprises a primary reactor, a secondary reactor, a buffer tank, a gas-solid separator and a flash cooler (gas-liquid separation). In the reaction process, reaction raw materials are fully mixed in a first-stage reactor, are subjected to preliminary reaction, are fully reacted in a second-stage reactor from a bottom outlet of the first-stage reactor to a bottom inlet of the second-stage reactor, a gas-liquid mixture after the reaction in the second-stage reactor enters a buffer tank from a top outlet, gas, liquid and solid are primarily separated by heating the buffer tank, and solid slag is discharged into a transfer box along with part of liquid and enters the next working section; the liquid is vaporized through the heating section, and enters a gas-solid separator (gas-solid separation) along with gas and part of solid through a gas outlet at the upper part, the separated solid returns to the buffer tank along with part of liquid from the bottom, and the gas and part of liquid enter the flash cooler from the top, so that the non-condensable gas is further thoroughly separated from the vaporized liquid; the non-condensable gas enters a recovery system for recycling, and the condensed liquid enters a crude product storage tank and enters the next working section.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model has reasonable structure and good use effect, can greatly improve the production yield from 28 percent of the prior crude product to about 36 percent, and the improvement rate reaches 28.6 percent. In addition, acetylene gas is prevented from directly entering the tubular reactor to be decomposed at high temperature to produce carbon black, and the acetylene gas is bonded with other byproducts to block a distribution plate in the reactor, so that reaction is influenced, and production accidents are caused. The horizontally distributed distribution plate also avoids the blocking phenomenon.
Drawings
FIG. 1 is a schematic view of the structure of a production apparatus for 2-methylpyridine according to the present invention.
Detailed Description
The utility model is described in further detail below with reference to the figures and the detailed description.
Example 1
As shown in figure 1, a production device of 2-methylpyridine comprises a primary reactor, a secondary reactor, a buffer tank, a gas-solid separator and a flash cooler;
the raw material inlet of the first-stage reactor is connected with the outlet of the reaction raw material tank, and the catalyst inlet of the first-stage reactor is connected with the outlet of the quantitative pump of the catalyst storage tank; the bottom outlet of the first-stage reactor is connected with the bottom inlet of the second-stage reactor, and the top exhaust port of the second-stage reactor is connected with the inlet of the buffer tank; the bottom of the secondary reactor is provided with a slag discharge port connected with a bottom inlet of the buffer tank; an outlet at the upper part of the buffer tank is connected with an inlet of the gas-solid separator, an outlet at the bottom of the gas-solid separator is connected with a waste residue section of the buffer tank, a residue discharge port is arranged at the bottom of the buffer tank, and the residue discharge port at the bottom of the buffer tank is connected with the transfer box;
a gas outlet of the gas-solid separator is connected with an inlet of the flash cooler, a gas outlet of the flash cooler is connected with the recovery system, and a product outlet of the flash cooler is connected with the crude product storage tank to enter the next working section;
the middle part of the first-stage reactor is provided with a packing layer, and a raw material distributor is arranged at a raw material inlet of the first-stage reactor;
the bottom of the secondary reactor is provided with a pore plate distributor, the upper part of the secondary reactor is provided with a reflux distribution plate, the middle part of the secondary reactor is provided with a self-flowing stirrer, and a heat exchanger is arranged outside the secondary reactor.
The reaction raw material tank is an acetylene compressor and an acetonitrile raw material tank. The outlet of the acetylene compressor is correspondingly provided with a gas distributor, and the outlet of the acetonitrile raw material tank is correspondingly provided with a liquid distributor. The middle part of the buffer tank is provided with a heater.
And a temperature sensor and a pressure sensor are arranged in the primary reactor.
And a temperature sensor, a pressure sensor and a liquid level sensor are arranged in the secondary reactor.
The production method of the 2-methylpyridine based on the device comprises the following steps:
1. the reaction raw material acetylene enters the primary reactor from the upper part of the primary reactor, and a gas distributor is arranged at an acetylene outlet; the reaction raw material acetonitrile enters the primary reactor from the middle upper part of the primary reactor, and a liquid distributor is arranged at an acetonitrile outlet; the middle part of the first-stage reactor is filled with a filler, so that acetylene acetonitrile is fully and uniformly mixed; the catalyst continuously enters the primary reactor from the lower part of the primary reactor through a quantitative pump; the mixed solution enters a secondary reactor from a discharge port at the bottom of the primary reactor; in the first-stage reactor, the temperature is controlled at 50-150 deg.C, and the pressure is controlled at 0.6-2.0 Mp.
2. The external heat exchanger of the secondary reactor is communicated with steam and a cooling water pipe and can be used for adjusting the internal temperature in the secondary reactor, so that the temperature in the secondary reactor is controlled to be 120-. The temperature can be increased by using the heater, and can be decreased after overtemperature.
3. The mixed liquid entering the secondary reactor is further fully reacted. In the reaction process, the mixture passes through the bottom first layer of pore plate distributor, so that the mixture is more uniform and the reaction is more stable; then under the action of pressure difference, the mixed liquid pushes the self-flow stirrer to rotate, so that the mixed liquid is more uniformly mixed and the reaction is more stable; then the mixture is more uniformly mixed and the reaction is more stable through a reflux distribution plate at the upper part of the stirrer, so that the reaction is stably carried out; the temperature is controlled at 190 ℃ and the pressure is controlled at 0.6-2.0 Mp. The reaction temperature can be stabilized by adjusting the quantitative pump flow rate of the catalyst.
4. The bottom of the secondary reactor is provided with a slag discharge port, slag is discharged according to actual conditions, and discharged waste liquid enters a buffer tank. Temperature, pressure and liquid level sensing and controlling devices are respectively arranged at the upper part, the middle part and the lower part of the secondary reactor; the upper part of the first-stage reactor is provided with a temperature and pressure sensing and controlling device.
5. The mixed gas (unreacted acetonitrile, acetylene, generated 2-methylpyridine, by-products and waste catalyst) after the reaction enters a buffer tank through an exhaust port at the upper part of the secondary reactor.
6. Reducing the pressure of the buffer tank to reduce the flow rate and preliminarily separating gas, solid and liquid; the solid deposits to the bottom of the buffer tank, the middle part of the buffer tank is provided with a heating section to vaporize the liquid, and the vaporized liquid enters the gas-solid separator along with the gas and the entrained partial solid through an upper outlet of the buffer tank. The settled solids are discharged into a transfer box through a slag discharge port at the bottom of the buffer tank and enter the next working section; the gas discharged from the upper part is separated from gas and solid by a gas-solid separator, and the solid waste residue is continuously discharged to the bottom of the buffer tank through a bottom outlet of the gas-solid separator, discharged into the transfer box along with a slag discharge port at the bottom and enters the next working section.
7. Gas passing through the gas-solid separator enters a flash cooler, is rapidly cooled and condensed to completely separate gas and liquid, unreacted acetylene and non-condensable gas enter a recovery system for reuse, and acetonitrile and 2-methylpyridine which are condensed off enter a crude product storage tank and enter a rectification section.
The acetylene gas is fully mixed at low temperature in the first-stage reactor for preliminary reaction, so that the decomposition and cyclization of the acetylene gas are avoided, the acetylene gas is fully reacted through multiple distribution and mixing in the second-stage reactor, the yield and the production efficiency of the 2-methylpyridine are improved, the horizontal distribution plate avoids the blockage of the second-stage reactor, the potential production hazard is eliminated, and the safety production is improved.
Set up the heating section in the buffer tank, in time heat the evaporation liquid, avoid because various uncertain factors cause the liquid level in the buffer tank too high, can not normal production, cause the work load or the system that arrange the material and increase next workshop section too much to stop.
In the gas-solid separator, the gas which is discharged from the buffer tank and is mixed with solid slag is further separated, the solid slag is separated, the blockage and the heat exchange effect of the flash cooler are avoided, the energy is saved, and the production efficiency is improved.
The catalyst is quantitatively and continuously added into the first-stage reactor, so that the raw materials and the catalyst are mixed more uniformly, the reaction is more stable, the production is safer, the use amount of the catalyst is greatly reduced, and the cost is lower.
Through the reasonable configuration of the structure and the method, the continuity and the safety of production are greatly improved, and the production efficiency is also greatly improved. The mass content of the 2-methylpyridine in the crude product can reach 36 percent.
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (4)
1. The production device of the 2-methylpyridine is characterized by comprising a primary reactor, a secondary reactor, a buffer tank, a gas-solid separator and a flash cooler;
the raw material inlet of the first-stage reactor is connected with the pump outlet of the reaction raw material tank, and the catalyst inlet of the first-stage reactor is connected with the pump outlet of the catalyst storage tank; the bottom outlet of the first-stage reactor is connected with the bottom inlet of the second-stage reactor, and the top exhaust port of the second-stage reactor is connected with the inlet of the buffer tank; a slag discharge port at the bottom of the secondary reactor is connected with a waste liquid inlet of the buffer tank; an outlet at the upper part of the buffer tank is connected with an inlet of the gas-solid separator, an outlet at the bottom of the gas-solid separator is connected with a waste residue section of the buffer tank, a residue discharge port is arranged at the bottom of the buffer tank, and the residue discharge port at the bottom of the buffer tank is connected with the transfer box;
the gas outlet of the gas-solid separator is connected with the inlet of the flash cooler, the gas outlet of the flash cooler is connected with the recovery system, and the product outlet of the flash cooler is connected with the next working section;
the middle part of the first-stage reactor is provided with a packing layer, and a raw material distributor is arranged at a raw material inlet of the first-stage reactor;
the bottom of the secondary reactor is provided with a pore plate distributor, the upper part of the secondary reactor is provided with a reflux distribution plate, the middle part of the secondary reactor is provided with a self-flowing stirrer, and a heat exchanger is arranged outside the secondary reactor.
2. The apparatus for producing 2-methylpyridine according to claim 1, wherein the reaction raw material tank is an acetylene compressor and an acetonitrile raw material tank.
3. The apparatus for producing 2-methylpyridine according to claim 1, wherein a temperature sensor and a pressure sensor are provided in the primary reactor.
4. The apparatus for producing 2-methylpyridine according to claim 1, wherein a temperature sensor, a pressure sensor and a liquid level sensor are disposed in the secondary reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122940195.6U CN216499225U (en) | 2021-11-26 | 2021-11-26 | Production device of 2-methylpyridine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122940195.6U CN216499225U (en) | 2021-11-26 | 2021-11-26 | Production device of 2-methylpyridine |
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| Publication Number | Publication Date |
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| CN216499225U true CN216499225U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122940195.6U Active CN216499225U (en) | 2021-11-26 | 2021-11-26 | Production device of 2-methylpyridine |
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| CN (1) | CN216499225U (en) |
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2021
- 2021-11-26 CN CN202122940195.6U patent/CN216499225U/en active Active
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