Device for synthesizing maldehyde

Abstract

The utility model relates to a device for synthesizing maldehyde. The device comprises a synthesis device and a carbon monoxide recovery device, the carbon monoxide recovery device comprises a buffer device, a drying device and a gas collecting device which are connected in sequence; the buffer device is connected with the synthesis device; and a tail gas emptying device is also arranged between the synthesis device and the carbon monoxide recovery device. According to the device disclosed by the utility model, unreacted CO can be further treated through the carbon monoxide recovery device after the synthesis of the rice aldehyde, the collected carbon monoxide can be used for the synthesis of the rice aldehyde, the equipment is not damaged, the safe, efficient and energy-saving production is facilitated, and the device realizes the effective recovery and efficient utilization of CO waste gas, so that the production cost is reduced. And energy waste and environmental pressure caused by incineration treatment are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of rice aldehyde synthesis and waste gas recovery, in particular to a device for synthesizing rice aldehyde. Background Art

[0002] 2,4,6-Trimethylbenzaldehyde (commonly known as "rice aldehyde") is an important chemical raw material.

[0003] In the current process, rice aldehyde is produced by the Gattermann-Koch reaction of mesitylene, carbon monoxide (CO), aluminum chloride and hydrochloric acid. The reaction process is a high-pressure reaction. After the reaction is completed and before discharging, the unreacted CO raw material in the kettle is replaced by nitrogen and enters the tail gas, and then is discharged after incineration. This method not only wastes the raw material CO and causes high unit consumption, but also produces greenhouse gas carbon dioxide (CO2) after incineration, which will have an impact on the environment.

[0004] Therefore, it is very important to develop a production device that can effectively recover carbon monoxide after the synthesis of rice aldehyde. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a device for synthesizing rice aldehyde. After the rice aldehyde is synthesized, the device can further process the unreacted CO through a carbon monoxide recovery device. The collected carbon monoxide can be used for rice aldehyde synthesis without causing damage to the equipment, which is conducive to safe, efficient and energy-saving production. The device realizes the effective recovery and efficient utilization of CO waste gas, avoiding energy waste and environmental pressure caused by incineration treatment.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a device for synthesizing rice aldehyde, which comprises a synthesis device and a carbon monoxide recovery device;

[0008] The carbon monoxide recovery device comprises a buffer device, a drying device and a gas collecting device which are sequentially connected;

[0009] The buffer device is connected to the synthesis device;

[0010] A tail gas venting device is also arranged between the synthesis device and the carbon monoxide recovery device.

[0011] In the utility model, the device can further process the unreacted CO through a carbon monoxide recovery device after the synthesis of rice aldehyde, and the collected carbon monoxide can be used for rice aldehyde synthesis without causing damage to the equipment, which is conducive to safe, efficient and energy-saving production. The device realizes the effective recovery and efficient utilization of CO waste gas, avoiding energy waste and environmental pressure caused by incineration. Specifically, after the synthesis of rice aldehyde, the waste gas containing unreacted CO enters the buffer device from the synthesis device to avoid damage to the equipment and safety hazards caused by high-pressure gas, and then enters the drying device for drying treatment, and finally is collected by the gas collection device to complete the recovery of CO.

[0012] In the utility model, after the rice aldehyde synthesis is completed in the device, the waste gas can also be directly discharged through the tail gas venting device, and can also be used as a pressure relief component of the synthesis device to avoid safety hazards caused by high-pressure gas.

[0013] Preferably, the synthesis device comprises a synthesis reactor.

[0014] Preferably, a pressure reducing valve is provided between the buffer device and the synthesis device.

[0015] In the utility model, a pressure reducing valve is arranged between the buffer device and the synthesis device, which can

[0016] In the utility model, a pressure reducing valve is arranged between the buffer device and the synthesis device. After the reaction of the rice aldehyde synthesis device, the exhaust gas is firstly depressurized through the pressure reducing valve and then enters the buffer device, which can prevent high-pressure gas from directly entering the buffer device and causing safety accidents.

[0017] Preferably, the buffer device comprises at least two (eg, three, four, five, etc.) buffer tanks connected in series.

[0018] In the utility model, the buffer device can improve the buffer efficiency by arranging buffer tanks in series and performing graded buffering.

[0019] Preferably, a cut-off valve is provided between the buffer device and the drying device.

[0020] In the utility model, a cut-off valve is arranged between the buffer device and the drying device, which can prevent the waste gas from directly entering the gas collecting device through the drying device due to high gas pressure after passing through the buffer device, thus causing danger.

[0021] Preferably, a cut-off valve is provided between the synthesis device and the buffer device.

[0022] In the utility model, a cut-off valve is arranged between the synthesis device and the buffer device, which can prevent the excessive gas pressure from directly entering the gas collection device and causing danger during the waste gas treatment process.

[0023] Preferably, the drying device comprises a first drying device and a second drying device;

[0024] The first drying device comprises at least two (e.g., three, four, five, etc.) drying tanks connected in series;

[0025] The second drying device comprises at least two (eg, three, four, five, etc.) molecular sieves connected in series.

[0026] In the utility model, the drying device forms a two-stage drying mode through the first drying device and the second drying device, and the first drying device is further graded with drying tanks connected in series, and the second drying device is similar, which can effectively improve the gas drying efficiency.

[0027] Preferably, the gas collection device comprises an air bag.

[0028] Preferably, the gas collecting device is connected to a carbon monoxide gas generating device.

[0029] Preferably, the carbon monoxide gasification device comprises a carbon monoxide gasification kettle.

[0030] In the utility model, the gas collecting device is connected to the carbon monoxide gas generating device and enters the synthesis device to further participate in the reaction.

[0031] Preferably, the carbon monoxide recovery device further comprises a compression device;

[0032] The compression device is connected to the gas collecting device.

[0033] Preferably, the compression device and the synthesis device are connected.

[0034] Compared with the prior art, the utility model has the following beneficial effects:

[0035] In the utility model, the device can further process the unreacted CO through a carbon monoxide recovery device after the synthesis of rice aldehyde, and the collected carbon monoxide can be used for rice aldehyde synthesis without causing damage to the equipment, which is conducive to safe, efficient and energy-saving production. The device realizes the effective recovery and efficient utilization of CO waste gas, avoiding energy waste and environmental pressure caused by incineration treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of the structure of the device described in Example 1;

[0037] Among them, 1-synthesis device; 2-pressure reducing valve; 3-buffer tank; 4-cut-off valve; 5-drying tank; 6-molecular sieve; 7-air bag; 8-compression device; 9-tail gas venting device. DETAILED DESCRIPTION

[0038] To facilitate understanding of the present invention, the present invention is listed in the following embodiments. Those skilled in the art should understand that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0039] The utility model provides a device for synthesizing rice aldehyde, which comprises a synthesis device and a carbon monoxide recovery device;

[0040] The carbon monoxide recovery device comprises a buffer device, a drying device and a gas collecting device which are sequentially connected;

[0041] The buffer device is connected to the synthesis device;

[0042] A tail gas venting device is also arranged between the synthesis device and the carbon monoxide recovery device.

[0043] In the utility model, the device can further process the unreacted CO through a carbon monoxide recovery device after the synthesis of rice aldehyde, and the collected carbon monoxide can be used for rice aldehyde synthesis without causing damage to the equipment, which is conducive to safe, efficient and energy-saving production. The device realizes the effective recovery and efficient utilization of CO waste gas, avoiding energy waste and environmental pressure caused by incineration. Specifically, after the synthesis of rice aldehyde, the waste gas containing unreacted CO enters the buffer device from the synthesis device to avoid damage to the equipment and safety hazards caused by high-pressure gas, and then enters the drying device for drying treatment, and finally is collected by the gas collection device to complete the recovery of CO.

[0044] In the utility model, after the rice aldehyde synthesis is completed in the device, the waste gas can also be directly discharged through the tail gas venting device, and can also be used as a pressure relief component of the synthesis device to avoid safety hazards caused by high-pressure gas.

[0045] Exemplarily, the synthesis apparatus comprises a synthesis reactor.

[0046] Exemplarily, a pressure reducing valve is provided between the buffer device and the synthesis device.

[0047] In the utility model, a pressure reducing valve is arranged between the buffer device and the synthesis device, which can

[0048] In the utility model, a pressure reducing valve is arranged between the buffer device and the synthesis device. After the reaction of the rice aldehyde synthesis device, the exhaust gas is firstly depressurized through the pressure reducing valve and then enters the buffer device, which can prevent high-pressure gas from directly entering the buffer device and causing safety accidents.

[0049] Exemplarily, the buffer device includes at least two (eg, three, four, five, etc.) buffer tanks connected in series.

[0050] In the utility model, the buffer device can improve the buffer efficiency by arranging buffer tanks in series and performing graded buffering.

[0051] Exemplarily, a shut-off valve is provided between the buffer device and the drying device.

[0052] In the utility model, a cut-off valve is arranged between the buffer device and the drying device, which can prevent the waste gas from directly entering the gas collecting device through the drying device due to high gas pressure after passing through the buffer device, thus causing danger.

[0053] Exemplarily, a shut-off valve is provided between the synthesis device and the buffer device.

[0054] In the utility model, a cut-off valve is arranged between the synthesis device and the buffer device, which can prevent the excessive gas pressure from directly entering the gas collection device and causing danger during the waste gas treatment process.

[0055] Exemplarily, the drying device comprises a first drying device and a second drying device;

[0056] The first drying device comprises at least two (e.g., three, four, five, etc.) drying tanks connected in series;

[0057] The second drying device comprises at least two (eg, three, four, five, etc.) molecular sieves connected in series.

[0058] In the utility model, the drying device forms a two-stage drying mode through the first drying device and the second drying device, and the first drying device is further graded with drying tanks connected in series, and the second drying device is similar, which can effectively improve the gas drying efficiency.

[0059] Exemplarily, the gas collection device comprises an air bag.

[0060] Exemplarily, the gas collection device is connected to a carbon monoxide gasification device.

[0061] Exemplarily, the carbon monoxide gasification device includes a carbon monoxide gasification kettle.

[0062] In the utility model, the gas collecting device is connected to the carbon monoxide gas generating device and enters the synthesis device to further participate in the reaction.

[0063] Exemplarily, the carbon monoxide recovery device further comprises a compression device;

[0064] The compression device is connected to the gas collecting device.

[0065] Exemplarily, the compression device and the synthesis device are connected.

[0066] Example 1

[0067] This embodiment provides a device for synthesizing rice aldehyde, and its structural schematic diagram is as follows Figure 1 As shown, the device comprises a synthesis device 1 and a carbon monoxide recovery device;

[0068] The carbon monoxide recovery device comprises a buffer device, a drying device and a gas collecting device which are sequentially connected;

[0069] The buffer device is connected to the synthesis device.

[0070] A tail gas venting device 9 is also provided between the synthesis device and the carbon monoxide recovery device.

[0071] A pressure reducing valve 2 is provided between the buffer device and the synthesis device.

[0072] The buffer device comprises two buffer tanks 3 connected in series.

[0073] A cut-off valve 4 is provided between the buffer device and the drying device.

[0074] The drying device comprises a first drying device and a second drying device;

[0075] The first drying device comprises two drying tanks 5 connected in series;

[0076] The second drying device comprises two molecular sieves 6 connected in series.

[0077] The gas collecting device comprises an air bag 7 .

[0078] The gas collecting device is connected to the carbon monoxide gas generating device.

[0079] The carbon monoxide recovery device further comprises a compression device 8;

[0080] The compression device is connected to a gas collecting device; the compression device is also connected to a synthesis device.

[0081] Example 2

[0082] This embodiment provides a device for synthesizing rice aldehyde, the device comprising a synthesis device and a carbon monoxide recovery device;

[0083] The carbon monoxide recovery device comprises a buffer device, a drying device and a gas collecting device which are sequentially connected;

[0084] The buffer device is connected to the synthesis device.

[0085] A tail gas venting device is also arranged between the synthesis device and the carbon monoxide recovery device.

[0086] A pressure reducing valve is arranged between the buffer device and the synthesizing device.

[0087] The buffer device includes three buffer tanks connected in series.

[0088] A cut-off valve is arranged between the synthesis device and the buffer device.

[0089] The drying device comprises a first drying device and a second drying device;

[0090] The first drying device comprises three drying tanks connected in series;

[0091] The second drying device comprises two molecular sieves connected in series.

[0092] The gas collection device includes an air bag.

[0093] The gas collecting device is connected to the carbon monoxide gas generating device.

[0094] The carbon monoxide recovery device also includes a compression device;

[0095] The compression device is connected to a gas collecting device, and the compression device is also connected to a synthesis device.

[0096] Example 3

[0097] This embodiment provides a device for synthesizing rice aldehyde, the device comprising a synthesis device and a carbon monoxide recovery device;

[0098] The carbon monoxide recovery device comprises a buffer device, a drying device and a gas collecting device which are sequentially connected;

[0099] The buffer device is connected to the synthesis device.

[0100] A tail gas venting device is also arranged between the synthesis device and the carbon monoxide recovery device.

[0101] A pressure reducing valve is arranged between the buffer device and the synthesizing device.

[0102] The buffer device comprises two buffer tanks connected in series.

[0103] A cut-off valve is arranged between the buffer device and the drying device.

[0104] A cut-off valve is arranged between the synthesis device and the buffer device.

[0105] The drying device comprises a first drying device and a second drying device;

[0106] The first drying device comprises two drying tanks connected in series;

[0107] The second drying device comprises two molecular sieves connected in series.

[0108] The gas collection device includes an air bag.

[0109] The gas collecting device is connected to the carbon monoxide gas generating device.

[0110] The carbon monoxide recovery device also includes a compression device;

[0111] The compression device is connected to a gas collecting device, and the compression device is also connected to a synthesis device.

[0112] Comparative Example 1

[0113] The difference between this embodiment and embodiment 1 is that the buffer device and the drying device are replaced by an alkali washing device, and the alkali washing device is composed of two alkali washing tanks connected in series. The rest is the same as embodiment 1.

[0114] How to operate

[0115] Taking the device described in Example 1 as an example, a rice aldehyde synthesis and CO recycling experiment was carried out. The specific operation method is: rice aldehyde is generated in a reactor with mesitylene, CO, aluminum chloride and hydrochloric acid. After the reaction is completed, the 1.0MPa CO gas in the reactor is decompressed to 0.025MPa through a pressure reducing valve, enters a buffer device for buffering, then enters a drying device, and then enters an air bag, and then is compressed to 7MPa by a compression device, mixed with CO in a gasification device, and transferred to a synthesis device to continue to participate in the synthesis of rice aldehyde. The same applies to the remaining embodiments.

[0116] The operating method of Comparative Example 1 differs from that of Example 1 in that the buffer device and the drying device are replaced by an alkaline washing device, and the rest are the same as Example 1.

[0117] Results Analysis

[0118] The CO in the gasification device is produced by dehydrating formic acid with concentrated sulfuric acid. The mass of formic acid consumed by synthesizing 1 part of rice aldehyde by the synthesis device described in Example 1 (without the carbon monoxide recovery device, directly through the tail gas venting device to control the tail gas) is 100%, and the synthesis device described in Example 1 and the carbon monoxide recovery device are used to prepare the same mass of rice aldehyde. The formic acid consumed is 77%, and the quality of rice aldehyde is not affected. However, the formic acid consumed by preparing the same mass of rice aldehyde by the device described in Comparative Example 1 (traditional process of the prior art) is 78%, but there are two problems in this method: one is that after alkali washing, a large amount of water is brought into the gas collection device after recycling CO, causing a large amount of water to be stored in the compression device, which is very harmful to the equipment and also has the risk of affecting the synthesis reaction; the second is that some solvents are taken out, and the diaphragm of the compression device is obviously carbonized, causing the valve to be blocked and replaced frequently.

[0119] Therefore, the device described in the utility model can further process the unreacted CO through the carbon monoxide recovery device after the synthesis of the rice aldehyde, and the collected carbon monoxide can be used for the synthesis of the rice aldehyde without causing damage to the equipment, which is conducive to safe, efficient and energy-saving production. The device realizes the effective recovery and efficient utilization of CO waste gas, avoiding the energy waste and environmental pressure caused by incineration treatment.

[0120] The applicant declares that the utility model uses the above-mentioned embodiments to illustrate the detailed method of the utility model, but the utility model is not limited to the above-mentioned detailed method, that is, it does not mean that the utility model must rely on the above-mentioned detailed method to be implemented. The technicians in the relevant technical field should understand that any improvement of the utility model, the equivalent replacement of the raw materials of the utility model product, the addition of auxiliary components, the selection of specific methods, etc., all fall within the protection scope and disclosure scope of the utility model.

Claims

1. A device for synthesizing rice aldehyde, characterized in that, The device includes a synthesis device and a carbon monoxide recovery device; The carbon monoxide recovery device comprises a buffer device, a drying device and a gas collecting device which are sequentially connected; The buffer device is connected to the synthesis device; A tail gas venting device is also arranged between the synthesis device and the carbon monoxide recovery device.

2. The device according to claim 1, characterized in that A pressure reducing valve is arranged between the buffer device and the synthesizing device.

3. The device according to claim 1, characterized in that The buffer device includes at least two buffer tanks connected in series.

4. The device according to claim 1, characterized in that A cut-off valve is arranged between the buffer device and the drying device.

5. The device according to claim 1, characterized in that A cut-off valve is arranged between the synthesis device and the buffer device.

6. The device according to claim 1, characterized in that The drying device comprises a first drying device and a second drying device; The first drying device comprises at least two drying tanks connected in series; The second drying device comprises at least two molecular sieves connected in series.

7. The device according to claim 1, characterized in that The gas collection device includes an air bag.

8. The device according to claim 1, characterized in that The gas collecting device is connected to the carbon monoxide gas generating device.

9. The device according to claim 1, characterized in that The carbon monoxide recovery device also includes a compression device; The compression device is connected to the gas collecting device.

10. The device according to claim 9, characterized in that The compression device is connected to the synthesis device.

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