| 摘要 |
The method for the production of a polymer-dispersion based on polychloroprene, comprises carrying out a polymerization of chloroprene to polychloroprene in an emulsion up to a maximum solid material portion of W s o l i d= 30 wt.% in a polychloroprene dispersion existed after the polymerization, and separating chloroprene from polychloroprene dispersion in a multi-stage and/or multi-base stripper-column (36) up to a chloroprene portion of W(CR, out) = 10 ppm in a polychloroprene dispersion existed after the separation of chloroprene. The method for the production of a polymer-dispersion based on polychloroprene, comprises carrying out a polymerization of chloroprene to polychloroprene in an emulsion up to a maximum solid material portion of W s o l i d= 30 wt.% in a polychloroprene dispersion existed after the polymerization, and separating chloroprene from polychloroprene dispersion in a multi-stage and/or multi-base stripper-column (36) up to a chloroprene portion of W(CR, out) = 10 ppm in a polychloroprene dispersion existed after the separation of chloroprene. The polychloroprene dispersion brought to the stripper-column has total aqueous phase of polychloroprene dispersion existing directly after the polymerization. The polychloroprene dispersion is supplied before the supply into the stripper-column to aqueous phase and/or water. The polymerization is carried out predominantly through a batch-reaction in a batch reactor. The polychloroprene dispersion after the polymerization is continuously supplied into a buffer tank before the separation. The polychloroprene dispersion brought to the stripper-column has a chloroprene portion of 5000 ppm = W(CR, in) = 15000 ppm. After the polymerization and before the separation, the degassing of the polychloroprene dispersion is carried out. After the separation of the chloroprene, concentrating of the cleaned polychloroprene dispersion is carried out by a roughing process. In the stripper column, steam is fed with an over pressure (delta p) in comparison to the pressure of the supplied polychloroprene dispersion of 6 bar = delta p = 7 bar with a sump temperature of 70[deg] C = T = 80[deg] C. The ratio of mass flow of the steam supplied to the stripper-column to a mass flow of the polychloroprene dispersion supplied to the stripper-column is 0.09 = R = 0.12. The stripper column comprises a number (N) of steps and/or base, where 11 = N = 12. The stripper column comprises a step height (h) of 1100 mm = h = 1200 mm, and/or the base has a diameter of 1500 mm = D = 2000 mm related to a circular cross-section. An independent claim is included for a plant for the production of a polymer-dispersion based on polychloroprene. |
