Working Process of First Absorption Tower and Second Absorption Tower in Formaldehyde Production

As a Hydrogen Peroxide Plant Supplier, let us explain the working process and principle of the first absorption tower and the second absorption tower in the production of formaldehyde.

Their working process is: gas enters the tower from the bottom of the tower, enters the packing layer through the packing support frame, and the absorption liquid enters the liquid distributor from the upper part of the tower to spray the absorption liquid evenly on the packing, and the surface of the packing is wetted by the absorption liquid. When the gas passes through the gap of the packing layer, it exchanges mass with the absorbing liquid on the surface of the packing. As the spraying liquid continuously flows downward, the absorbing liquid film on the surface of the packing changes continuously, so that the mass transfer resistance is greatly reduced, so as to prevent the spray liquid from being prevented. The phenomenon of bias flow and no generation of channel flow and wall flow, the filler layer is divided into two or more sections, each section is provided with a liquid redistributor, and the liquid distributor structure can be installed on the line in the tower by using a trough distributor.

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During the ascending process, the gas mixture gradually transfers the formaldehyde to the absorption liquid to the top outlet (about 80 to 90% of the formaldehyde gas is absorbed by the liquid) and then enters the subsequent absorption tower, and the remaining formaldehyde is absorbed in the same manner.

The process of absorbing the two towers is an absorption. Although the exhaust gas can achieve better absorption after treatment with a spray washer, the process is relatively cumbersome. Therefore, in order to enhance the absorption effect and achieve a better concentration gradient, the current process uses the double-cycle process of the absorption tower.

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