| 摘要 |
382,235. Concentrating latex. METALLGES AKT.-GES., 45, Bockenheimer Anlage, Frankforton- Main, Germany. May 9, 1932, No. 13378. Convention date, May 9, 1931. [Class 32.] Rubber latex is heated under conditions precluding the formation of steam and is then sprayed or otherwise dispersed into an evaporating chamber in which a pressure lower than the vapour pressure of the heated latex is maintained. For example the latex may be heated to 90‹ C. and the pressure in the evaporator may be 40mm. of mercury. The conditions are preferably such that evaporation is complete before the latex comes into contact with the walls of the evaporating chamber. The Figure shows an apparatus for carrying out the process continuously. Latex from the reservoir a is drawn through the heater c and sprayed into the evaporator d, from which it is periodically returned to the vessel a and recirculated. Suitable connections are made to a condenser f and exhaust pump h. |
