| 摘要 |
<p>1,138,627. Removing heat in polymerization reactions. BADISCHE ANILIN- & SODAFABRIK A.G. 12 Jan., 1966, No. 1388/66. Heading C3P. [Also in Division B1] Heat of reaction, evolved in the emulsion, suspension or solution polymerization of olefinically unsaturated monomers in a reactor, is removed by evaporating one or more liquids contained in the dispersion or solution, condensing the vapour in a condenser and returning the condensate to the reactor, the polymerization being carried out in a closed system (i.e. a system in which the reactor is in pressure communication with the condenser but not with the external atmosphere, so that the pressure in reactor and condenser may be fixed independently of atmospheric pressure) and the internal temperature of the reactor being maintained constant by a self-regulating action wherein the internal temperature of the reactor controls a regulating means which regulates the rate of condensation in the condenser which, in turn, controls the internal temperature of the reactor. An apparatus adapted for such a controlled polymerization process is described. Examples describe the polymerization, in aqueous medium, of (a) vinyl propionate, (b) acrylamide with acrylic acid and (c) vinyl chloride with vinyl propionate.</p> |
