Patent ID: 7790816
Filing Date: 2010-09-07
Classification: C08F,Y10S

Abstract:
1. A process for maintaining heat transfer capacity of a cycle cooler while polymerizing olefin(s) in the presence of catalyst, the process comprising the steps of: (a) introducing a polymerization catalyst and a carboxylate metal salt comprising a Group 13 metal atom into a reaction system, the reaction system comprising a reactor vessel and a cycle cooler; (b) reacting at least one olefin with the polymerization catalyst under polymerization conditions in the reactor vessel; (c) transferring a heat of reaction to a cycle fluid; (d) removing at least a portion of the heat of reaction from the cycle fluid in the cycle cooler; and (e) controlling the amount of the carboxylate metal salt introduced such that a cycle cooler performance parameter is substantially constant over a period of time of operation, wherein the cycle cooler performance parameter is selected from the group consisting of a heat transfer capacity of the cycle cooler, a pressure drop across the cycle cooler at substantially similar conditions, and a cooler approach temperature.