Manganese 2-methylcyclopentadienyl tricarbonyl diluent and preparation process thereof

Abstract

The invention provides a 2-methylcyclopentadienyl manganese tricarbonyl diluent and a preparation process thereof, and relates to the field of petrochemical industry. The 2-methyl cyclopentadienyl manganese tricarbonyl diluent disclosed by the invention is prepared from the following raw materials in parts by weight: 70 to 80 parts of 2-methyl cyclopentadienyl manganese tricarbonyl, 20 to 30 parts of dimethyl octanoate, 0.1 to 0.3 part of 2, 6-butylated hydroxytoluene, 0.4 to 0.6 part of a compound light stabilizer, 0.3 to 0.5 part of alkylphenol polyoxyethylene ether and 0.08 to 0.12 part of benzotriazole. According to the invention, 2-methylcyclopentadienyl manganese tricarbonyl is taken as a basic raw material, dimethyl octanoate is taken as a solvent, and 2, 6-butylated hydroxytoluene, a composite light stabilizer, alkylphenol polyoxyethylene and benzotriazole are added, so that a diluent system is effectively optimized, and the prepared 2-methylcyclopentadienyl manganese tricarbonyl diluent has better light stability, and is suitable for industrial production. Moreover, the freezing point is lower, and the method is suitable for a wider application range.

Description

Technical Field

[0001] The invention relates to the field of petrochemical industry, and in particular to a 2-methylcyclopentadiene manganese tricarbonyl dilution liquid and a preparation process thereof. Background Art

[0002] 2-2-Methylcyclopentadienyl manganese tricarbonyl (MMT for short), also known as 2-methylcyclopentadienyl manganese tricarbonyl, has a wide range of applications, such as as a gasoline antiknock agent, gasoline octane enhancer, unleaded gasoline antiknock agent, gasoline octane improver, octane enhancer and octane enhancer, etc.

[0003] The influence of most solvents on the stability of 2-methylcyclopentadienyl manganese tricarbonyl on the market has not been systematically studied. In the preparation process, conventional diluents often have the disadvantages of high volatility, high toxicity, and poor environmental protection, which bring potential harm to operators and the environment. Therefore, it is particularly important to develop a safe, environmentally friendly 2-methylcyclopentadienyl manganese tricarbonyl diluent and its preparation process with good dilution effect.

[0004] Therefore, in view of the deficiencies in the prior art, the present invention aims to provide a novel 2-methylcyclopentadienyl manganese tricarbonyl dilution, which not only has excellent physical properties, but also can effectively improve the stability of 2-methylcyclopentadienyl manganese tricarbonyl. In addition, the present invention will also explore an efficient and simple preparation process in combination with environmental protection and economic principles to meet the needs. Summary of the invention

[0005] In view of this, the present invention proposes a 2-methylcyclopentadienyl manganese tricarbonyl dilution and a preparation process thereof to solve the above problems.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A 2-methylcyclopentadiene manganese tricarbonyl dilution comprises the following raw materials in parts by weight: 70-80 parts of 2-methylcyclopentadiene manganese tricarbonyl, 20-30 parts of dimethyl octanoate, 0.1-0.3 parts of 2,6-di-tert-butyl-p-cresol, 0.4-0.6 parts of a composite light stabilizer, 0.3-0.5 parts of alkylphenol polyoxyethylene ether, and 0.08-0.12 parts of benzotriazole.

[0008] Preferably, the 2-methylcyclopentadiene manganese tricarbonyl dilution comprises the following raw materials in parts by weight: 74-75 parts of 2-methylcyclopentadiene manganese tricarbonyl, 23-25 ​​parts of dimethyl octanoate, 0.19-0.21 parts of 2,6-di-tert-butyl-p-cresol, 0.49-0.51 parts of composite light stabilizer, 0.3-0.5 parts of alkylphenol polyoxyethylene ether, and 0.09-0.11 parts of benzotriazole.

[0009] Preferably, the 2-methylcyclopentadiene manganese tricarbonyl dilution comprises the following raw materials in parts by weight: 74.8 parts of 2-methylcyclopentadiene manganese tricarbonyl, 24 parts of dimethyl octanoate, 0.2 parts of 2,6-di-tert-butyl-p-cresol, 0.5 parts of a composite light stabilizer, 0.4 parts of alkylphenol polyoxyethylene ether, and 0.1 parts of benzotriazole.

[0010] Preferably, the composite light stabilizer consists of light stabilizer UV-2908 and light stabilizer UV-944 in a mass ratio of 1:2-4.

[0011] The invention also provides a preparation process of a 2-methylcyclopentadiene manganese tricarbonyl dilution, comprising the following steps: adding 2-methylcyclopentadiene manganese tricarbonyl into a pressure-reducing tank provided with a stirring shaft, sequentially adding dimethyl octanoate, 2,6-di-tert-butyl-p-cresol and a composite light stabilizer, and stirring under reduced pressure; then mixing with alkylphenol polyoxyethylene ether and benzotriazole, and stirring at low temperature with the assistance of ultrasonic wave to prepare the 2-methylcyclopentadiene manganese tricarbonyl dilution.

[0012] Preferably, the reduced pressure stirring process: the set pressure is 0.4-0.6 bar, the stirring speed is 60-80 rpm, and the stirring time is 10-20 min.

[0013] Preferably, the ultrasonic-assisted low-temperature stirring process has the following characteristics: the ultrasonic frequency is 30-40 KHz, the stirring speed is 40-60 rpm, the stirring temperature is 5-15° C., and the processing time is 5-10 min.

[0014] Preferably, the reduced pressure stirring process: set the pressure to 0.5 bar, the stirring speed to 70 rpm, and the stirring time to 15 min.

[0015] Preferably, the ultrasonic-assisted low-temperature stirring process has the following characteristics: the ultrasonic frequency is 35 KHz, the stirring speed is 50 rpm, the stirring temperature is 10° C., and the processing time is 8 min.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention uses 2-methylcyclopentadiene manganese tricarbonyl as a basic raw material, uses dimethyl octanoate as a solvent, adds 2,6-di-tert-butyl-p-cresol, a composite light stabilizer, alkylphenol polyoxyethylene ether, and benzotriazole, and effectively optimizes the diluent system. The prepared 2-methylcyclopentadiene manganese tricarbonyl diluent has better light stability and a lower freezing point. It can still remain in a liquid state under low temperature conditions and is suitable for a wider range of applications. At the same time, the flash point meets the requirements, and the safety is better guaranteed.

[0018] (2) The present invention adds a certain proportion of alkylphenol polyoxyethylene ether, 2,6-di-tert-butyl-p-cresol and composite light stabilizer to effectively reduce the aggregation and precipitation of MMT in the solution, and forms a protective film by adsorbing on the surface of MMT to reduce the interaction force between particles, thereby improving long-term stability and preventing its precipitation or aggregation during storage or use; it can also absorb or scatter light radiation, reduce the direct impact of light on MMT, and reduce the risk of photodegradation; in addition, it can inhibit the oxidation reaction caused by light, which helps to extend the effective service life of the diluent; it can also improve the flash point of the entire diluent and enhance safety; it interacts with other components in the diluent, thereby changing the interaction force, resulting in a decrease in the overall freezing point, and can still remain in liquid under low temperature conditions, suitable for a wider range of applications.

[0019] (3) The present invention uses dimethyl octanoate as a solvent instead of traditional toluene, which not only improves environmental protection but also improves safety and efficiency.

[0020] (4) The 2-methylcyclopentadienyl manganese tricarbonyl diluent provided by the present invention not only has excellent physical properties and good stability, but is also more environmentally friendly than traditional diluents, and has the characteristics of high efficiency, environmental protection, and economy. DETAILED DESCRIPTION

[0021] In order to better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0022] Unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods.

[0023] Unless otherwise specified, the materials, reagents, etc. used in the embodiments of the present invention can be obtained from commercial sources.

[0024] A 2-methylcyclopentadiene manganese tricarbonyl dilution comprises the following raw materials in parts by weight: 70-80 parts of 2-methylcyclopentadiene manganese tricarbonyl, 20-30 parts of dimethyl octanol, 0.1-0.3 parts of 2,6-di-tert-butyl-p-cresol, 0.4-0.6 parts of a composite light stabilizer, 0.3-0.5 parts of alkylphenol polyoxyethylene ether, and 0.08-0.12 parts of benzotriazole; the composite light stabilizer is composed of a light stabilizer UV-2908 and a light stabilizer UV-944 in a mass ratio of 1:2-4.

[0025] The present invention also provides a preparation process of 2-methylcyclopentadiene manganese tricarbonyl dilution, comprising the following steps: adding 2-methylcyclopentadiene manganese tricarbonyl into a decompression tank provided with a stirring shaft, sequentially adding dimethyl octanoate, 2,6-di-tert-butyl-p-cresol, and a composite light stabilizer, and performing decompression stirring, wherein specific process parameters are: setting a pressure of 0.4-0.6 bar, a stirring speed of 60-80 rpm, and a stirring time of 10-20 min;

[0026] The mixture is then mixed with alkylphenol polyoxyethylene ether and benzotriazole, and stirred at low temperature with the assistance of ultrasonic wave. The specific process parameters are as follows: ultrasonic frequency is 30-40KHz, stirring speed is 40-60 rpm, stirring temperature is 5-15°C, and processing time is 5-10min; and a 2-methylcyclopentadiene tricarbonyl manganese dilution is obtained.

[0027] Example 1

[0028] A 2-methylcyclopentadienyl manganese tricarbonyl dilution comprises the following raw materials in parts by weight: 74.8 parts of 2-methylcyclopentadienyl manganese tricarbonyl, 24 parts of dimethyl octanol, 0.2 parts of 2,6-di-tert-butyl-p-cresol, 0.5 parts of a composite light stabilizer, 0.4 parts of alkylphenol polyoxyethylene ether, and 0.1 parts of benzotriazole; the composite light stabilizer is composed of a light stabilizer UV-2908 and a light stabilizer UV-944 in a mass ratio of 1:3.

[0029] The preparation process of the above-mentioned 2-methylcyclopentadiene manganese tricarbonyl dilution comprises the following steps: adding 2-methylcyclopentadiene manganese tricarbonyl into a pressure reduction tank provided with a stirring shaft, adding dimethyl octanoate, 2,6-di-tert-butyl-p-cresol and a composite light stabilizer in sequence, and performing reduced pressure stirring, wherein the specific process parameters are: setting the pressure to 0.5 bar, the stirring speed to 70 rpm, and the stirring time to 15 min; then mixing with alkylphenol polyoxyethylene ether and benzotriazole, and performing ultrasonic-assisted low-temperature stirring, wherein the specific process parameters are: ultrasonic frequency to 35 KHz, stirring speed to 50 rpm, stirring temperature to 10° C., and processing time to 8 min; and obtaining the 2-methylcyclopentadiene manganese tricarbonyl dilution.

[0030] Example 2

[0031] A 2-methylcyclopentadiene manganese tricarbonyl dilution, the component ratio of which is different from that of Example 1, comprises the following raw materials in parts by weight: 74.8 parts of 2-methylcyclopentadiene manganese tricarbonyl, 24.1 parts of dimethyl octanol, 0.1 part of 2,6-di-tert-butyl-p-cresol, 0.4 part of a composite light stabilizer, 0.5 part of alkylphenol polyoxyethylene ether, and 0.1 part of benzotriazole; the composite light stabilizer is composed of light stabilizer UV-2908 and light stabilizer UV-944 in a mass ratio of 1:3.

[0032] The preparation process of the above-mentioned 2-methylcyclopentadiene manganese tricarbonyl dilution comprises the following steps: adding 2-methylcyclopentadiene manganese tricarbonyl into a pressure reduction tank provided with a stirring shaft, adding dimethyl octanoate, 2,6-di-tert-butyl-p-cresol and a composite light stabilizer in sequence, and performing reduced pressure stirring, wherein the specific process parameters are: setting the pressure to 0.5 bar, the stirring speed to 70 rpm, and the stirring time to 15 min; then mixing with alkylphenol polyoxyethylene ether and benzotriazole, and performing ultrasonic-assisted low-temperature stirring, wherein the specific process parameters are: ultrasonic frequency to 35 KHz, stirring speed to 50 rpm, stirring temperature to 10° C., and processing time to 8 min; and obtaining the 2-methylcyclopentadiene manganese tricarbonyl dilution.

[0033] Example 3

[0034] A 2-methylcyclopentadiene manganese tricarbonyl dilution, the component ratio of which is different from that of Example 1, comprises the following raw materials in parts by weight: 74.8 parts of 2-methylcyclopentadiene manganese tricarbonyl, 23.9 parts of dimethyl octanol, 0.3 parts of 2,6-di-tert-butyl-p-cresol, 0.6 parts of a composite light stabilizer, 0.3 parts of alkylphenol polyoxyethylene ether, and 0.1 parts of benzotriazole; the composite light stabilizer is composed of a light stabilizer UV-2908 and a light stabilizer UV-944 in a mass ratio of 1:4.

[0035] The preparation process of the above-mentioned 2-methylcyclopentadiene manganese tricarbonyl dilution comprises the following steps: adding 2-methylcyclopentadiene manganese tricarbonyl into a pressure reduction tank provided with a stirring shaft, adding dimethyl octanoate, 2,6-di-tert-butyl-p-cresol and a composite light stabilizer in sequence, and performing reduced pressure stirring, wherein the specific process parameters are: setting the pressure to 0.5 bar, the stirring speed to 70 rpm, and the stirring time to 15 min; then mixing with alkylphenol polyoxyethylene ether and benzotriazole, and performing ultrasonic-assisted low-temperature stirring, wherein the specific process parameters are: ultrasonic frequency to 35 KHz, stirring speed to 50 rpm, stirring temperature to 10° C., and processing time to 8 min; and obtaining the 2-methylcyclopentadiene manganese tricarbonyl dilution.

[0036] Example 4

[0037] A 2-methylcyclopentadienyl manganese tricarbonyl dilution comprises the following raw materials in parts by weight: 74.8 parts of 2-methylcyclopentadienyl manganese tricarbonyl, 24 parts of dimethyl octanol, 0.2 parts of 2,6-di-tert-butyl-p-cresol, 0.5 parts of a composite light stabilizer, 0.4 parts of alkylphenol polyoxyethylene ether, and 0.1 parts of benzotriazole; the composite light stabilizer is composed of a light stabilizer UV-2908 and a light stabilizer UV-944 in a mass ratio of 1:3.

[0038] The preparation process of the above-mentioned 2-methylcyclopentadiene tricarbonyl manganese dilution is different from that of Example 1, and comprises the following steps: adding 2-methylcyclopentadiene tricarbonyl manganese into a pressure reduction tank provided with a stirring shaft, adding dimethyl octanoate, 2,6-di-tert-butyl-p-cresol, and a composite light stabilizer in sequence, and stirring under reduced pressure. The specific process parameters are: setting the pressure to 0.4 bar, the stirring speed to 60 rpm, and the stirring time to 20 min; then mixing with alkylphenol polyoxyethylene ether and benzotriazole, and stirring at low temperature with ultrasonic assistance. The specific process parameters are: ultrasonic frequency of 30 KHz, stirring speed of 40 rpm, stirring temperature of 5 ° C, and processing time of 10 min; and obtaining a 2-methylcyclopentadiene tricarbonyl manganese dilution.

[0039] Example 5

[0040] A 2-methylcyclopentadienyl manganese tricarbonyl dilution comprises the following raw materials in parts by weight: 74.8 parts of 2-methylcyclopentadienyl manganese tricarbonyl, 24 parts of dimethyl octanol, 0.2 parts of 2,6-di-tert-butyl-p-cresol, 0.5 parts of a composite light stabilizer, 0.4 parts of alkylphenol polyoxyethylene ether, and 0.1 parts of benzotriazole; the composite light stabilizer is composed of a light stabilizer UV-2908 and a light stabilizer UV-944 in a mass ratio of 1:3.

[0041] The preparation process of the above-mentioned 2-methylcyclopentadiene tricarbonyl manganese dilution is different from that of Example 1, and comprises the following steps: adding 2-methylcyclopentadiene tricarbonyl manganese into a pressure reduction tank provided with a stirring shaft, adding dimethyl octanoate, 2,6-di-tert-butyl-p-cresol, and a composite light stabilizer in sequence, and stirring under reduced pressure. The specific process parameters are: setting the pressure to 0.6 bar, the stirring speed to 80 rpm, and the stirring time to 10 min; then mixing with alkylphenol polyoxyethylene ether and benzotriazole, and stirring at low temperature with ultrasonic assistance. The specific process parameters are: ultrasonic frequency of 40 KHz, stirring speed of 60 rpm, stirring temperature of 15 ° C, and processing time of 5 min; and obtaining a 2-methylcyclopentadiene tricarbonyl manganese dilution.

[0042] Comparative Example 1

[0043] A 2-methylcyclopentadienyl manganese tricarbonyl dilution solution is mainly different from Example 1 in that: the added amounts of 2,6-di-tert-butyl-p-cresol, composite light stabilizer, alkylphenol polyoxyethylene ether and benzotriazole are increased.

[0044] Specifically, the raw materials include 74.8 parts of cyclopentadiene tricarbonyl manganese, 24 parts of dimethyl octanoate, 0.3 parts of 2,6-di-tert-butyl-p-cresol, 0.3 parts of composite light stabilizer, 0.3 parts of alkylphenol polyoxyethylene ether, and 0.3 parts of benzotriazole; the composite light stabilizer is composed of light stabilizer UV-2908 and light stabilizer UV-944 in a mass ratio of 1:3. Its preparation process is consistent with that of Example 1.

[0045] Comparative Example 2

[0046] A 2-methylcyclopentadienyl manganese tricarbonyl dilution solution, which is mainly different from Example 1 in that 2,6-di-tert-butyl-p-cresol is replaced by 4,4-thiobis(2-methyl-6-tert-butylphenol).

[0047] Comparative Example 3

[0048] A 2-methylcyclopentadienyl manganese tricarbonyl dilution solution, which is mainly different from Example 1 in that the alkylphenol polyoxyethylene ether is replaced by polyisobutylene pentaerythritol succinate.

[0049] Comparative Example 4

[0050] A 2-methylcyclopentadienyl manganese tricarbonyl dilution solution, which is mainly different from Example 1 in that the composite light stabilizer is replaced by a single light stabilizer UV-2908.

[0051] Comparative Example 5

[0052] The difference from Example 1 is that the preparation process of 2-methylcyclopentadiene tricarbonyl manganese dilution adopts normal temperature stirring and prolongs the stirring time. Specifically comprising the following steps: adding 2-methylcyclopentadiene tricarbonyl manganese into a stirring tank, sequentially adding dimethyl octanoate, 2,6-di-tert-butyl-p-cresol, and a composite light stabilizer, stirring at normal temperature, and the specific process parameters are: stirring speed 70 rpm, stirring time 30 min; then mixing with alkylphenol polyoxyethylene ether and benzotriazole, stirring at normal temperature, and the specific process parameters are: stirring speed 50 rpm, processing time 20 min; obtaining 2-methylcyclopentadiene tricarbonyl manganese dilution.

[0053] Experimental example

[0054] Under an illumination of 1200 Lx, the photostability W of the diluted 2-methylcyclopentadienyl manganese tricarbonyl solution was determined by changing different exposure times (30 min, 60 min, 90 min, 120 min), and the MMT concentration in the sample before and after exposure was determined by the gas chromatograph internal standard method.

[0055] Light stability W = (MMT concentration before exposure T 0 - MMT concentration after exposure T 1 ) / MMT concentration before exposure T 0 *100%.

[0056] The flash point and solidification point are tested. The flash point is tested by the closed cup method, and the solidification point is tested by the initial solidification point.

[0057] Table 1 Light stability W value (1200Lx)

[0058] 0min 30min 60min 90min 120min Example 1 100％ 99.8％ 99.6％ 99.2％ 98.8％ Example 2 100％ 99.0％ 98.2％ 98.3％ 97.0％ Example 3 100％ 99.6％ 98.7％ 98.5％ 97.2％ Example 4 100％ 99.4％ 99.0％ 98.9％ 97.7％ Example 5 100％ 99.2％ 96.5％ 98.7％ 97.5％ Comparative Example 1 100％ 97.2％ 94.8％ 92.7％ 90.7％ Comparative Example 2 100％ 96.7％ 94.1％ 91.8％ 89.5％ Comparative Example 3 100％ 95.7％ 92.6％ 89.9％ 85.7％ Comparative Example 4 100％ 97.7％ 94.2％ 93.6％ 92.2％ Comparative Example 5 100％ 97.9％ 96.5％ 95.7％ 94.3％

[0059] As shown in Table 1, the results show that compared with Comparative Examples 1-5, the 2-methylcyclopentadienyl manganese tricarbonyl diluted solution prepared in Examples 1-5 has better light stability, and the light stability W value after exposure for 120 minutes is ≥97.0%.

[0060] Table 2 Solidification point and flash point test results

[0061]

[0062]

[0063] As shown in Table 2, the results show that compared with Comparative Examples 1-3, the 2-methylcyclopentadiene manganese tricarbonyl dilution prepared in Examples 1-5 has a lower freezing point and a higher flash point.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dilution of 2-methylcyclopentadienyl manganese tricarbonyl, It is characterized in that The invention comprises the following raw materials in parts by weight: 70-80 parts of 2-methylcyclopentadiene tricarbonyl manganese, 20-30 parts of dimethyl octanoate, 0.1-0.3 parts of 2,6-di-tert-butyl-p-cresol, 0.4-0.6 parts of a composite light stabilizer, 0.3-0.5 parts of alkylphenol polyoxyethylene ether and 0.08-0.12 parts of benzotriazole.

2. The 2-methylcyclopentadienyl manganese tricarbonyl dilution according to claim 1, It is characterized in that The invention comprises the following raw materials in parts by weight: 74-75 parts of 2-methylcyclopentadiene tricarbonyl manganese, 23-25 ​​parts of dimethyl octanoate, 0.19-0.21 parts of 2,6-di-tert-butyl-p-cresol, 0.49-0.51 parts of a composite light stabilizer, 0.3-0.5 parts of alkylphenol polyoxyethylene ether and 0.09-0.11 parts of benzotriazole.

3. The 2-methylcyclopentadienyl manganese tricarbonyl dilution according to claim 2, It is characterized in that The invention comprises the following raw materials in parts by weight: 74.8 parts of 2-methylcyclopentadiene tricarbonyl manganese, 24 parts of dimethyl octanoate, 0.2 parts of 2,6-di-tert-butyl-p-cresol, 0.5 parts of a composite light stabilizer, 0.4 parts of alkylphenol polyoxyethylene ether and 0.1 parts of benzotriazole.

4. The 2-methylcyclopentadienyl manganese tricarbonyl dilution according to any one of claims 1 to 3, It is characterized in that The composite light stabilizer consists of light stabilizer UV-2908 and light stabilizer UV-944 in a mass ratio of 1:2-4.

5. A process for preparing the 2-methylcyclopentadiene manganese tricarbonyl dilution according to any one of claims 1 to 4, It is characterized in that The following steps are involved: 2-Methylcyclopentadienyl manganese tricarbonyl is added into a pressure reducing tank provided with a stirring shaft, and dimethyl octanoate, 2,6-di-tert-butyl-p-cresol and a composite light stabilizer are added in sequence, and the mixture is stirred under reduced pressure; the mixture is then mixed with alkylphenol polyoxyethylene ether and benzotriazole, and stirred at low temperature with the assistance of ultrasonic wave to obtain a 2-methylcyclopentadienyl manganese tricarbonyl dilution.

6. The preparation process of the 2-methylcyclopentadienyl manganese tricarbonyl dilution according to claim 5, It is characterized in that The reduced pressure stirring process: set the pressure to 0.4-0.6 bar, the stirring speed to 60-80 rpm, and the stirring time to 10-20 min.

7. The preparation process of the 2-methylcyclopentadienyl manganese tricarbonyl dilution according to claim 5, It is characterized in that The ultrasonic-assisted low-temperature stirring process has the following characteristics: the ultrasonic frequency is 30-40 KHz, the stirring speed is 40-60 rpm, the stirring temperature is 5-15° C., and the processing time is 5-10 min.

8. The preparation process of 2-methylcyclopentadienyl manganese tricarbonyl dilution according to claim 6, It is characterized in that The reduced pressure stirring process: set the pressure to 0.5 bar, the stirring speed to 70 rpm, and the stirring time to 15 min.

9. The preparation process of 2-methylcyclopentadienyl manganese tricarbonyl diluted solution according to claim 7, It is characterized in that The ultrasonic-assisted low-temperature stirring process has the following characteristics: the ultrasonic frequency is 35 KHz, the stirring speed is 50 rpm, the stirring temperature is 10° C., and the processing time is 8 min.

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