Method for synthesizing PODE through condensation, oxidation, polycondensation and etherification of methyl alcohol
A polyoxymethylene dimethyl ether, chemical synthesis technology, applied in the direction of chemical instruments and methods, preparation of organic compounds, carbon-based compounds, etc., can solve the problems of reducing product yield, product separation difficulties, etc., to improve the purity And yield, reduce hydrolysis reaction, strong selectivity effect
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Example Embodiment
[0041] Example 1
[0042] Such as figure 1 As shown, the synthesis method of this embodiment is:
[0043] Step 1. Methanol condensation to prepare methylal: Mix methanol and dilute formaldehyde with a mass concentration of 5% according to the molar ratio of methanol to formaldehyde at a ratio of 2.0:1 and then send them to the reactor 1 filled with catalyst for condensation reaction. The reaction temperature of the condensation reaction is 90°C, the reaction pressure is 8.0MPa, and then the materials after the condensation reaction are sent to the first reactive distillation tower 2. The number of sieve plates on the top of the first reactive distillation tower 2 is 30 , The number of sieve plates at the bottom of the tower is 30, the number of layers of the packed bed is 8, and the top pressure of the first reactive distillation tower 2 is controlled to 50kPa, the top temperature is 47℃, the bottom temperature is 115℃, reflux The ratio is 3.0. The materials after the condensatio...
Example Embodiment
[0051] Example 2
[0052] Such as figure 1 As shown, the synthesis method of this embodiment is:
[0053] Step 1. Methanol condensation to prepare methylal: Mix methanol and dilute formaldehyde with a mass concentration of 20% in a ratio of 3.0:1 in the molar ratio of methanol to formaldehyde, and then send them to reactor 1 filled with catalyst for condensation reaction. The reaction temperature of the condensation reaction is 70°C, the reaction pressure is 5.0MPa, and then the materials after the condensation reaction are sent to the first reactive distillation tower 2, and the number of sieve plates on the top of the first reactive distillation tower 2 is 20 , The number of sieve plates at the bottom of the tower is 20, the number of packed beds is 5, and the top pressure of the first reactive distillation tower 2 is controlled to 30kPa, the top temperature is 45℃, the bottom temperature is 108℃, and the reflux The ratio is 2.0. The materials after the condensation reaction in...
Example Embodiment
[0061] Example 3
[0062] Such as figure 1 As shown, the synthesis method of this embodiment is:
[0063] Step 1. Methanol condensation to prepare methylal: Mix methanol and dilute formaldehyde with a mass concentration of 45% according to the ratio of methanol to formaldehyde at a molar ratio of 3.5:1, and then send them to reactor 1 filled with catalyst for condensation reaction. The reaction temperature of the condensation reaction is 60°C, the reaction pressure is 2.0MPa, and then the materials after the condensation reaction are sent to the first reactive distillation tower 2. The number of sieve plates on the top of the first reactive distillation tower 2 is 5 , The number of sieve plates at the bottom of the tower is 5, the number of packed beds is 2, and the top pressure of the first reactive distillation tower 2 is controlled to 5kPa, the top temperature is 42.3°C, the bottom temperature is 100°C, and the reflux ratio Is 1.0, the material after the condensation reaction ...
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