Polymerization Method

Abstract

The invention relates to a process for continuously preparing water-absorbing polymer particles by mixing a monomer solution with a redox initiator consisting of at least one oxidizing agent and at least one reducing agent and polymerizing it, wherein the monomer solution is mixed with at least one oxidizing agent upstream of the polymerization reactor and the at least one reducing agent is metered into the polymerization reactor, and also to an apparatus for performing the process.

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         11 . An apparatus for continuous polymerization, comprising
 i) a polymerization reactor,   ii) a first inlet to the polymerization reactor   iii) at least one inlet into the first inlet ii),   iv) a second inlet to the polymerization reactor and   v) a device for comminuting a polymer gel,   
       where an extended axis of the first inlet ii) intersects an extended axis of the second inlet iv) in the polymerization reactor i). 
     
     
         12 . The apparatus according to  claim 11 , wherein an inner surface of the first inlet ii) between the polymerization reactor i) and the inlet iii) at least partly has a contact angle for water of at least 60°. 
     
     
         13 . The apparatus according to  claim 11 , wherein a length of the first inlet ii) between the polymerization reactor i) and the inlet iii) is from 0.01 to 2 m. 
     
     
         14 . The apparatus according to  claim 11 , wherein the first inlet ii) is designed as a Venturi tube at a connection with the inlet iii) and the inlet iii) opens into a narrowing zone of the Venturi tube. 
     
     
         15 . The apparatus according to  claim 11 , wherein the angle between first inlet ii) and inlet iv) in flow direction is less than 90°.