The comparison between the sieve plate tower and the packed tower process is as follows:
Sieve plate tower process:
The reflux rate is small, and the reflux ratio is about 1:2, which saves steam consumption and reduces the load of the cooler;
With positive pressure operation, the condensation temperature of the methylal gas is high, the condenser does not need to use chilled water, and the methylal gas can be cooled with circulating water. Chilled water is only needed to vent the condenser (small) in summer. Low power consumption;
Breaking through the limit of azeotropic point, the content of methylal in the product can reach 98%
It is easy to replace the catalyst, without dismantling the tower;
Packing tower technology:
The equipment is simple, the manufacturing requirements are low, and the manufacturing cost is low.
In comparison, the steam consumption of the sieve tray tower is 75% (1+2:1+3) of the packed tower, and the packed tower consumes more steam, but consumes more electricity to cool the methylal gas at the top of the tower. The cooling load of the sieve tray is also 75% of the packed tower. And the power consumption of chilled water is much larger than that of circulating water, which is the main reason why the power consumption of the packed tower process is high.
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