Acetaldehyde synthesis device

Abstract

The utility model discloses an acetaldehyde synthesizer, which belongs to the technical field of synthesis of medical intermediates and comprises a reactor, the reactor is connected with a vaporizing chamber through a pipeline, a cyclone separator is arranged at the upper end of the reactor, and a first heat exchanger, a second heat exchanger and a third heat exchanger are arranged at the middle end of the reactor. Circulating water is introduced into the first heat exchanger and the second heat exchanger, a catalyst bed layer is further arranged on the reactor and mounted on the jacket, the third heat exchanger is connected with an upper air pocket of the steam generator through a pipeline, and the bottom of the steam generator is connected with an air outlet of the reactor through a pipeline. The problems that an existing catalyst is short in service life and inconvenient to replace, heat in the reaction process is difficult to remove, the temperature runaway phenomenon exists, and the reaction heat utilization rate is low can be solved. According to the utility model, the service life of the catalyst is long, the production cycle can be prolonged to 8-10 months, the catalyst is convenient to replace, the temperature runaway problem is solved, and the reaction heat utilization rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pharmaceutical intermediate synthesis, in particular to an acetaldehyde synthesis device. Background Art

[0002] Chinese patent publication number CN220780298U discloses a low steam consumption acetaldehyde production system, comprising an alcohol evaporator, an alcohol circulation pump, an acetaldehyde oxidizer, an acetaldehyde oxidizer drum, an acetaldehyde absorption tower, a distillation tower, an alcohol recovery tower, and a condenser. Raw alcohol enters the alcohol circulation pump, the outlet of the alcohol circulation pump is connected to the liquid inlet of the condenser, the high-temperature alcohol outlet of the condenser is connected to the liquid inlet of the alcohol evaporator, the gas outlet of the alcohol evaporator is connected to the gas inlet of the acetaldehyde oxidizer, the gas outlet of the acetaldehyde oxidizer is connected to the gas inlet of the acetaldehyde absorption tower, the liquid outlet of the acetaldehyde absorption tower is connected to the distillation tower, the bottom of the distillation tower is connected to the alcohol recovery tower, the top of the alcohol recovery tower is connected to the gas inlet of the condenser, the secondary steam outlet of the acetaldehyde oxidizer is connected to the inlet of the acetaldehyde oxidizer drum, and the outlet of the acetaldehyde oxidizer drum is connected to the alcohol evaporator and the alcohol recovery tower, respectively. Heat recovery and reuse are achieved, acetaldehyde product steam consumption is reduced, and the heat load of the circulating cooling water tower is reduced. However, the problems of catalyst life, reaction temperature runaway, and catalyst replacement are not solved.

[0003] Chinese patent publication number CN220370996U discloses an acetaldehyde system energy-saving device, including a reactor, a coiled heat exchanger, an ice machine, an intermediate tank, a falling film absorption tower, a dilute acetaldehyde storage tank, a distillation tower, and a reboiler. The reactor is connected to the coiled heat exchanger via a pipeline, the coiled heat exchanger is connected to the ice machine, the intermediate tank, and the falling film absorption tower via a pipeline, the middle end of the coiled heat exchanger is also connected to the lower end of the reactor via a pipeline, the falling film absorption tower is connected to the distillation tower via a pipeline, the falling film absorption tower is also connected to the dilute acetaldehyde storage tank via a pipeline, the coiled heat exchanger is also connected to the reboiler via a pipeline, and the reboiler is connected to the distillation tower via a pipeline. The device only solves the problem of reaction heat utilization, but does not address the problems of catalyst life, reaction temperature runaway, and catalyst replacement.

[0004] Therefore, the catalyst in the existing acetaldehyde synthesis device has a short service life and needs to be stopped and replaced every 2-3 months. During the replacement, people need to enter the reactor to operate. At the same time, the heat generated during the reaction process is difficult to remove, the reaction has a temperature runaway phenomenon, and the reaction heat utilization rate is low. Utility Model Content

[0005] The purpose of the utility model is to provide an acetaldehyde synthesis device, which not only has a long catalyst life and can extend the production cycle to 8 to 10 months, but also is convenient to replace the catalyst, solves the problem of temperature runaway, improves the utilization rate of reaction heat, and can solve the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An acetaldehyde synthesis device includes a reactor, the reactor is connected to a vaporization chamber via a pipeline, a cyclone separator is provided at the upper end of the reactor, a first heat exchanger, a second heat exchanger, and a third heat exchanger are provided at the middle end of the reactor, and a catalyst bed is also provided on the reactor, the catalyst bed being mounted on a jacket; the third heat exchanger is connected to the upper air bag of a steam generator via a pipeline, and the bottom of the steam generator is connected to the reactor outlet via a pipeline.

[0008] Preferably, the catalyst bed has three sections, each of which can be disassembled separately, wherein the temperature of the catalyst bed is controlled by a jacket outside the reactor, and each catalyst bed and the external jacket form a unit, with a total of three units.

[0009] Preferably, the first heat exchanger, the second heat exchanger and the third heat exchanger are all shell-and-tube heat exchangers, and an interlocking device is provided between the circulating water inlet of the first heat exchanger, the second heat exchanger and the third heat exchanger and the catalyst bed temperature.

[0010] Preferably, a feed pipeline is provided on the reactor, wherein the feed pipeline includes an ethanol feed pipe and an air feed pipe, the ethanol feed pipe is located at the upper end of the reactor, and the air feed pipe is located at the lower end of the reactor.

[0011] Preferably, the vaporization chamber is provided with an ethanol feed port and an ethanol discharge port, the ethanol discharge port of the vaporization chamber is connected to a gas distributor, the ethanol injected from the ethanol feed port is vaporized in the vaporization chamber, and the vaporized ethanol enters the gas distributor, wherein the gas distributor includes an ethanol gas distributor and an air distributor, the ethanol gas distributor is a longitudinal tube that passes through the three catalyst beds, and the tube contains circular holes, and the air distributor is located at the bottom of the reactor.

[0012] Preferably, the steam generator is in the form of an air bag, divided into an upper and lower part, with a metal tube bundle provided inside, and the metal tube bundle runs through the upper and lower parts of the steam generator.

[0013] Preferably, the steam generator is provided with a safety valve, a steam outlet and a pressure gauge.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] The catalyst life of the utility model is extended, and the production cycle can be extended to 8 to 10 months. The catalyst is easy to replace and workers do not need to enter the reactor to operate. Heat is removed in time during the reaction process, and the reaction temperature is stable. Part of the reaction heat is used to preheat the air, and part of the generated steam is used to vaporize ethanol, and the rest is incorporated into the steam main pipe, thereby improving the utilization rate of the reaction heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of the acetaldehyde synthesis device of the present utility model.

[0017] In the figure: 1. Reactor; 2. Vaporization chamber; 3. Cyclone separator; 4. First heat exchanger; 5. Second heat exchanger; 6. Third heat exchanger; 7. Catalyst bed; 8. Jacket; 9. Steam generator; 91. Safety valve; 92. Steam outlet; 93. Pressure gauge. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] To solve the technical problems of the existing acetaldehyde synthesis device, the catalyst has a short service life and needs to be stopped and replaced every 2-3 months. The replacement requires people to enter the reactor to operate. At the same time, the heat generated during the reaction is difficult to remove, the reaction has a temperature runaway phenomenon, and the reaction heat utilization rate is low. Figure 1 , this embodiment provides the following technical solutions:

[0020] An acetaldehyde synthesis device comprises a reactor 1, wherein the reactor 1 is connected to a vaporization chamber 2 through a pipeline, and the vaporization chamber 2 is provided with an ethanol feed port.

[0021] In this embodiment, a feed pipeline is provided on the reactor 1, wherein the feed pipeline includes an ethanol feed pipe and an air feed pipe, the ethanol feed pipe is located at the upper end of the reactor 1, and the air feed pipe is located at the lower end of the reactor 1.

[0022] In this embodiment, an ethanol feed port and an ethanol discharge port are provided on the vaporization chamber 2. The ethanol discharge port of the vaporization chamber 2 is connected to a gas distributor. The ethanol injected through the ethanol feed port is vaporized in the vaporization chamber 2, and the vaporized ethanol enters the gas distributor. The gas distributor includes an ethanol gas distributor and an air distributor. The ethanol gas distributor is a longitudinal tube that passes through the three catalyst beds 7. The tube contains small circular holes. The air distributor is located at the bottom of the reactor 1.

[0023] A cyclone separator 3 is provided at the upper end of the reactor 1 .

[0024] A first heat exchanger 4, a second heat exchanger 5 and a third heat exchanger 6 are provided at the middle end of the reactor 1, wherein circulating water is introduced into the first heat exchanger 4 and the second heat exchanger 5.

[0025] In this embodiment, the first heat exchanger 4, the second heat exchanger 5 and the third heat exchanger 6 are all shell-and-tube heat exchangers. At the same time, an interlocking device is provided between the circulating water inlet of the first heat exchanger 4, the second heat exchanger 5 and the third heat exchanger 6 and the temperature of the catalyst bed 7.

[0026] The reactor 1 is further provided with a catalyst bed 7 , which is mounted on a jacket 8 .

[0027] In this embodiment, the catalyst bed 7 has three sections, each of which can be disassembled separately. The temperature of the catalyst bed 7 is controlled by the jacket 8 outside the reactor 1. Each catalyst bed 7 and the external jacket 8 form a unit, with a total of three units.

[0028] The third heat exchanger 6 is connected to the upper air bag of the steam generator 9 through a pipeline, and the bottom of the steam generator 9 is connected to the gas outlet of the reactor 1 through a pipeline.

[0029] In this embodiment, the steam generator 9 is in the form of an air bag, which is divided into an upper and a lower part. A metal tube bundle is provided inside, and the metal tube bundle runs through the upper and lower parts of the steam generator 9.

[0030] In this embodiment, the steam generator 9 is provided with a safety valve 91 , a steam outlet 92 and a pressure gauge 93 .

[0031] It should be noted that ethanol is pumped into the vaporization chamber 2 through the ethanol feed port provided on the vaporization chamber 2 for vaporization. The vaporized ethanol enters the gas distributor provided on the reactor 1. Air enters from the bottom of the reactor 1, enters the third heat exchanger 6 through the gas distributor for preheating, and then enters the reaction section. Ethanol and air react in the three-stage catalyst bed 7. During the reaction, circulating water is introduced into the first heat exchanger 4 and the second heat exchanger 5 to remove part of the temperature in the reactor 1. The hot water coming out of the first heat exchanger 4 and the second heat exchanger 5 enters the third heat exchanger 6 to preheat the air. The gas coming out of the reactor 1 enters the bottom space of the steam generator 9, and the water coming out of the third heat exchanger 6 enters the upper air bag of the steam generator 9 to generate steam. A part of it is used to vaporize ethanol, and the rest is incorporated into the steam main pipe.

[0032] Among them, when replacing the catalyst, the catalyst bed 7 has three sections, each of which can be disassembled separately. Each catalyst bed 7 and the external jacket 8 are a unit, a total of three units. The three units are assembled. If any part needs to be replaced, the temperature of that part will be cooled separately, and then disassembled, so that each catalyst bed 7 is detachable. When replacing the catalyst, the catalyst bed 7 can be disassembled and replaced separately without human entry.

[0033] Therefore, the life of the catalyst is extended and the production cycle can be extended to 8 to 10 months. The catalyst is easy to replace and workers do not need to enter the reactor 1 to operate. During the reaction, heat is removed in time, the reaction temperature is stable, part of the reaction heat is used to preheat the air, part of the generated steam is used to vaporize ethanol, and the rest is incorporated into the steam main pipe, thereby improving the utilization rate of the reaction heat.

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An acetaldehyde synthesis device, comprising a reactor (1), characterized in that: The reactor (1) is connected to the vaporization chamber (2) through a pipeline. A cyclone separator (3) is provided at the upper end of the reactor (1). A first heat exchanger (4), a second heat exchanger (5) and a third heat exchanger (6) are provided at the middle end of the reactor (1). A catalyst bed (7) is also provided on the reactor (1), and the catalyst bed (7) is installed on a jacket (8). The third heat exchanger (6) is connected to the upper air bag of a steam generator (9) through a pipeline, and the bottom of the steam generator (9) is connected to the gas outlet of the reactor (1) through a pipeline.

2. An acetaldehyde synthesis device according to claim 1, characterized in that: The catalyst bed (7) has three sections, each of which is disassembled separately. The temperature of the catalyst bed (7) is controlled by a jacket (8) outside the reactor (1), and each catalyst bed (7) and the jacket (8) outside form a unit.

3. An acetaldehyde synthesis device according to claim 1, characterized in that: The first heat exchanger (4), the second heat exchanger (5) and the third heat exchanger (6) are all shell-and-tube heat exchangers. At the same time, an interlocking device is provided between the circulating water inlet of the first heat exchanger (4), the second heat exchanger (5) and the third heat exchanger (6) and the temperature of the catalyst bed (7).

4. An acetaldehyde synthesis device according to claim 1, characterized in that: The reactor (1) is provided with a feed pipeline, wherein the feed pipeline comprises an ethanol feed pipe and an air feed pipe, the ethanol feed pipe is located at the upper end of the reactor (1), and the air feed pipe is located at the lower end of the reactor (1).

5. An acetaldehyde synthesis device according to claim 4, characterized in that: The vaporization chamber (2) is provided with an ethanol feed port and an ethanol discharge port. The ethanol discharge port of the vaporization chamber (2) is connected to a gas distributor, wherein the gas distributor includes an ethanol gas distributor and an air distributor. The ethanol gas distributor is a longitudinal tube that passes through the three catalyst beds (7) and contains circular holes. The air distributor is located at the bottom of the reactor (1).

6. An acetaldehyde synthesis device according to claim 1, characterized in that: The steam generator (9) is divided into an upper and a lower part, and a metal tube bundle is provided inside, and the metal tube bundle runs through the upper and lower parts of the steam generator (9).

7. An acetaldehyde synthesis device according to claim 6, characterized in that: The steam generator (9) is provided with a safety valve (91), a steam outlet (92) and a pressure gauge (93).

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