Production process method of polyoxymethylene dimethyl ether
A polymethoxy dimethyl ether and production process technology, applied in the field of polymethoxy dimethyl ether production process, can solve the problem of low concentration of DMMn products, affecting the stable operation of a synthesis and separation system, and difficulty in separating target products, etc. problem, to achieve the effect of high concentration, improve the utilization rate of raw materials, and reduce production costs
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Embodiment 1
[0030] like figure 1 As shown, the production process method of polymethoxydimethyl ether in the present embodiment comprises the following steps:
[0031] S1, the raw material formaldehyde solution and the formaldehyde solution extracted from the top of the dilute aldehyde rectifying tower 15 are mixed and then enter the formaldehyde evaporator 2 through the demetallization reactor 1 to remove the metal ions, and the operating pressure is an absolute pressure of 0.008MPa, and the temperature is 55 ℃, after the formaldehyde evaporator 2 is heated, it is sent to the vacuum flash tank 3. The operating pressure of the vacuum flash tank 3 is an absolute pressure of 0.008MPa, and the concentrated formaldehyde solution of 56wt% is concentrated at the bottom of the vacuum flash tank 3. The vacuum flash tank 3. The dilute aldehyde gas at the top enters the dilute aldehyde condenser 4 and is condensed to obtain a 19wt% dilute aldehyde solution and is temporarily stored in the dilute al...
Embodiment 2
[0038] like figure 1 As shown, the production process method of polymethoxydimethyl ether in the present embodiment comprises the following steps:
[0039] S1, the raw material formaldehyde solution and the formaldehyde solution extracted from the top of the dilute aldehyde rectifying tower 15 are mixed and enter the formaldehyde evaporator 2 through the demetallization reactor 1 to remove the metal ions, and the operating pressure is an absolute pressure of 0.02MPa, and the temperature is 67 ℃, after the formaldehyde evaporator 2 is heated, it is sent to the vacuum flash tank 3, the operating pressure of the vacuum flash tank 3 is 0.02MPa absolute, and the concentrated formaldehyde solution of 69wt% is concentrated at the bottom of the vacuum flash tank 3, and the vacuum flash tank 3. The dilute aldehyde gas at the top enters the dilute aldehyde condenser 4 and is condensed to obtain a 16 wt% dilute aldehyde solution and is temporarily stored in the dilute aldehyde tank 5. Th...
Embodiment 3
[0046] like figure 1 As shown, the production process method of polymethoxydimethyl ether in the present embodiment comprises the following steps:
[0047] S1, the raw material formaldehyde solution and the formaldehyde solution extracted from the top of the dilute aldehyde rectifying tower 15 are mixed and then enter the formaldehyde evaporator 2 through the demetallization reactor 1 to remove the metal ions, and the operating pressure is an absolute pressure of 0.035MPa, and the temperature is 76 ℃, after the formaldehyde evaporator 2 is heated, it is sent to the vacuum flash tank 3, the operating pressure of the vacuum flash tank 3 is 0.035MPa absolute pressure, and the concentrated formaldehyde solution of 78wt% is concentrated at the bottom of the vacuum flash tank 3, and the vacuum flash tank 3. The dilute aldehyde gas at the top enters the dilute aldehyde condenser 4 and is condensed to obtain a 12wt% dilute aldehyde solution and is temporarily stored in the dilute alde...
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