Reducers in Detail

Drag Reducers in Detail Ultra-High Molecular Weight Polyethylene 

The flow of liquid hydrocarbons can be enhanced by introducing into the stream a nonagglomerating suspension of ultra-high molecular weight polyethylene [490,1647] in water with small amounts of surfactant. The finely divided polyethylene is prepared by polymerization and then cryogrinded below the glass-transition temperature. 

Several copolymers of or-olelins are used as drag reducers. Suggested recipes are summarized in Table 12-1. Linear low-density polyethylene is a copolymer of ethylene and a-olefins. It is obtained by copolymerization utilizing Ziegler-Natta catalysts or metallocene catalysts. Concentrates may be prepared by 

Copolymers from a-Olelins and Others Used as Drag Reducers 

By coating poly-a-olefins with a fatty acid wax as a partitioning agent and dispersing it in a long-chain alcohol, a nonagglomerating, nonaqueous suspension can be obtained [918]. 

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