Polymer Melt Distributor Header Design

Abstract

A vessel header comprising a plurality of lateral flow tubes arranged in a parallel configuration and entering the vessel header through alternating header penetrations with a single header penetration per lateral flow tube. A method of increasing the throughput of a polymerization reaction comprising conducting the polymerization reaction in a reaction vessel comprising a plurality of lateral flow tubes arranged in a parallel configuration and entering the vessel header through alternating header penetrations with a single header penetration per lateral flow tube wherein the polymerization reaction displays an increase in throughput of 10% and a decrease in volatiles of from 5% to 10% when compared to a polymerization reaction carried out in a reaction vessel lacking a plurality of lateral flow tubes arranged in a parallel configuration and entering the vessel header through alternating header penetrations with a single header penetration per lateral flow tube.

1 - 21 . (canceled) 
     
     
         22 . A polymer melt distribution header comprising:
 a plurality of lateral flow tubes arranged in a parallel configuration wherein the lateral flow tubes enter the header through alternating header penetrations with a single header penetration per lateral flow tube and;   an internal support structure for support of the lateral flow tube within the header opposite the header penetration wherein the internal support structure accommodates horizontal expansion or contraction of the lateral flow tube, wherein the internal support structure comprises a support cradle located opposite the header penetration on which the flow tube rests, the support cradle is interior to the header wall and wherein the support cradle is welded to the header interior along one or more weld arcs positioned inside the support cradle.   
     
     
         23 . The header of  claim 22  wherein the support cradle is welded to the header interior along one or more weld arcs positioned inside the support cradle such that the weld root spacing between the weld arc and penetration welds is minimized. 
     
     
         24 . The header of  claim 22  wherein the lateral flow tubes comprise devolatilizer nozzles having a perforated area for discharging molten polymer in strands. 
     
     
         25 . The header of  claim 24  wherein the lateral flow tubes comprise devolatilizer nozzles having a perforated area extending substantially the entire length of the flow tubes from the header penetrations to the internal support structure.