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Chain Reaction Sequences - Polymerization

Chain Reaction Sequences - Polymerization Kinetic Chain Length (KCL) is a key variable in all chain reaction sequences KCL = average number of closed propagation cycles achieved for each initiated reactive intermediate.

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Chain Reaction Sequences - Polymerization

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  1. Chain Reaction Sequences - Polymerization • Kinetic Chain Length (KCL) is a key variable in all chain reaction sequences • KCL = average number of closed propagation cycles achieved for each initiated reactive intermediate. • Values range from 1 (only one transformation realized before termination occurs) to infinity, but numbers in the 5-100 range are typical. • Consider our acrylate polymerization case study. What defines the instantaneous kinetic chain length of this process?

  2. Chain Reaction Sequences – Polymerization

  3. Chain Reaction Sequences – Polymerization

  4. Chain Reaction Sequences – Polymerization

  5. Chain Reaction Sequences – Oxidation • Vast quantities of phenol and acetone are produced from benzene, propylene, and air, as follows. • You should be able to write the mechanisms for each process. • Can you use your mechanisms to derive design rate expressions?

  6. Phenol+Acetone from Cumene Oxidation 4 1 2 3

  7. Cumene Oxidation - Chain Reaction

  8. Food for Thought… Design Project #2 • Derive expressions for the rate of cumene consumption, oxygen consumption, and cumene hydroperoxide production as a function of measurable process variables. • Today we will examine the open initiation and termination sequences of the chain process.

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