Process and apparatus for the continuous production of vinyl chloride polymers in aqueous emulsion
AssigneeHoechst Aktiengesellschaft
InventorsPaul Kastner, Christoph Heinze
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Abstract
A continuous process and an apparatus for the polymerization of vinyl chloride in aqueous emulsion wherein the liquid reaction mixture is fed into the lower part of a vertical, cylindrical vessel, the liquid level in the vessel is adjusted to at most 97% of the total interior height of the vessel, the reaction mixture is stirred with a stirrer which is totally immersed in the liquid and extends over 15 to 60% of the total interior height of the vessel and the produced polymer emulsion is laterally discharged from the upper part of the vessel.
Claims7
In a process for the continuous production of vinyl chloride homo-, co- or graft polymers in aqueous emulsion in the presence of radical-forming catalysts, surface active substances in the upright, cylindrical vessel with a ratio of height to diameter of at least 3 and a capacity of at least 5 m.sup.3, whilst stirring the polymerization mixture and regulating the level of the liquid in the vessel, the improvement which comprises discharging the polymerization emulsion from the vessel at the side at a level which is situated 30 to 90% of the total internal height of the vessel above the inlet for the starting substances and at least 15 cm below the surface of the liquid, regulating the standing level of the liquid to a maximum of 97% of the total internal height of the vessel and stirring the content of the vessel by at least one stirring device which extends in the liquid over 15 to 60% of the total internal height of the vessel, ends at least 20 cm below the surface of the liquid and stays at a distance of at least 15 cm from the vessel wall.
Dependencies are inferred from the claim text.