Production method of polyoxymethylene dimethylether
A polyoxymethylene dimethyl ether and production method technology, applied in chemical instruments and methods, preparation of organic compounds, sustainable manufacturing/processing, etc., can solve high energy consumption, complicated process, and low selectivity of polyoxymethylene dimethyl ether and other problems, to achieve low energy consumption, simple process, and overcome difficult control effects
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Embodiment 1
[0017] according to figure 1 As shown, the operating pressure of the catalytic distillation tower is 0.5 MPa, the number of theoretical plates in the stripping section is 20, the separation efficiency of the catalytic reaction section is equivalent to 25 theoretical plates, the catalyst is SAPO-34 molecular sieve, and the flow rate of paraformaldehyde is 2 g / min Enter the first theoretical plate (counting from top to bottom, the same below), methylal enters from the bottom of the catalytic reaction section at a flow rate of 1 g / min, the top of the tower is fully refluxed, and the flow ratio of the first and second parts of the tower kettle is 3 : 1, the catalytic reaction section temperature is 100~110 ℃, and the bottom of the tower is extracted with a flow rate of 3 g / min, and the reaction product enters the middle part of the feed side of the dividing wall rectification tower, wherein the number of theoretical plates in the common rectification section is 20, and the public ...
Embodiment 2~5
[0019] Other conditions are the same as in Example 1, except that the type of catalyst is changed, and the catalyst is Su Qing brand 001×4 strong acid resin, ZSM-5, SO 4 -2 / Fe 2 o 3 , Cl -1 / TiO 2 and SO 4 -2 / Fe 2 o 3 , the reaction pom DMM 3~8The single-pass selectivities were 52.5%, 53.4%, 55.7% and 58.2%, respectively, to produce 10 g / min polyoxymethylene dimethyl ether DMM 3~ 8 As a benchmark, the total energy consumption of the tower top and tower bottom of the two towers in the process is shown in Table 1.
Embodiment 6
[0021] according to figure 1 As shown, the operating pressure of the catalytic distillation tower is 4.0 MPa, the number of theoretical plates in the stripping section is 5, the separation efficiency of the catalytic reaction section is equivalent to 5 theoretical plates, the catalyst is MCM-22 molecular sieve, and the flow rate of paraformaldehyde is 1 g / min and methylal enter the first theoretical plate at a flow rate of 10 g / min, total reflux at the top of the tower, the flow ratio of the first and second parts of the tower kettle is 10:1, the temperature of the catalytic reaction section is 180-200 °C, and the bottom of the tower is at The flow rate of 11 g / min is extracted, and the reaction product enters the middle part of the feed side of the dividing wall rectification tower, in which the number of theoretical plates in the common rectification section is 5, and the number of theoretical plates in the common stripping section is 5. The feed side and the output side The...
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