Structure of VCM dehydration and alkali fixation tower
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I would like to ask everyone: What is the structure of a soda ash tower? Low inflow and high outflow for liquid monomers? Under what circumstances will alkali solution be entrained? Does it have a significant impact on polymerization?
Previously, packed towers were used, but the results were poor; there was definitely solid alkali entrainment.
A low-in, high-out process is used; it seems that entrainment is not significant, as there is no noticeable alkalinity when water is discharged into the monomer tank, and this has no obvious impact on the polymerization process. Method adopted: Ensure sufficient settling time in the monomer tank. If we are to talk about entrainment, it might occur to some extent under overload conditions.
The fact that no alkalinity is detected when draining water from the monomer tank does not mean that there is no alkali present, as a small amount of acidic substances are generated during the distillation of VCM.
This simply means that there is little alkali left by the polymerization stage, so it should have no effect on the polymerization reaction.
Our Shanghai Chlor-Alkali has already resolved the issues related to acidity and alkalinity mentioned above. Our system features a liquid flow pattern that goes from below to above: victory:
I have visited your factory before; could you provide a detailed explanation of your methods?
The structure of a solid-alkali dryer is generally such that material enters from the bottom and exits from the top (low inlet, high outlet). By controlling the flow rate of the monomer and ensuring an appropriate residence time, it is possible to effectively prevent the monomer from carrying alkali with it. This requires special attention during equipment design; otherwise, if the basicity of the monomer is too high, it will have a severe adverse effect on polymerization.
Sufficient settling time in the monomer tank. It should have no effect on the polymerization reaction