Patent ID: 8816026
Filing Date: 2014-08-26
Classification: B01F,B01J,C08F

Abstract:
1. A method for preparing polymer beads of uniform particle size by suspension polymerization comprising: (i) jetting a monomer solution of polymerizing monomers containing initiators into an upwardly flowing stream of monomer droplets through a plurality of orifices of 50-300 micron sizes at the bottom of a vertically located monomer droplets forming reaction vessel in a pulsating manner at a flow rate of 2-4 liters per hr and at a pressure of 0.2 to 1 Kg/cm (ii) allowing the monomer droplets in the liquid solution to rise up in the reaction vessel in a controlled and smooth manner under the dynamic forces exerted by differential flow rate and differential pressure between the pulsating monomer solution and liquid solution supplies and the differential densities between the monomer and liquid solutions without causing coalescence, agglomeration and breakup of the monomer droplets and allowing monomer droplets to stabilize by partial polymerization of the droplets by the suspension stabilizers in the liquid solution at 50 to 60° C. in the reaction vessel; (iii) allowing the monomer droplets in the liquid solution to flow out from the reaction vessel horizontally into a polymerization reactor fitted with agitator and located at an elevated position with respect to the reaction vessel and get polymerized in the polymerization reactor at 80-85° C. (iv) drying the polymer beads at 80 to 100° C.; and (v) sieving the polymer beads.