Abstract
This work is concerned with nonuniform temperatures in chain addition polymerizations, especially with extreme nonuniformities believed to be the root cause of ″hot spots″ in batch reactors and ″hot streamlines″ in continuous reactors. Such characteristics are frequently both manifestations of thermal ignition. The authors define thermal ignition in chemical reactors as that phenomenon which causes the temperature profile T(t) to take on two distinct characteristics: (1) high values of temperature in short times - sometimes referred to as ″runaway″ or ″autoacceleration″ ; and, (2) extreme sensitivity to slight variations in the system parameters - sometimes called ″parametric sensitivity″ or ″instability″ - which is manifested by a sharp transition from quasi-isothermal to runaway behavior. Thus, thermal ignition is characterized not only by a runaway temperature but by an element of instability as well. This review paper is presented under headings: thermal ignition theory (energy balance, locus of intersections, tangents; an approximation, graphical analysis, ignition criterion); chain addition polymerization; computational and experimental results.
| Original language | English (US) |
|---|---|
| Pages | 211-236 |
| Number of pages | 26 |
| State | Published - 1975 |
| Externally published | Yes |
| Event | Proc, Symp on Polym and Polycondens Processes, Am Chem Soc 169th Natl Meet - Philadelphia, PA, USA Duration: Apr 7 1975 → Apr 10 1975 |
Other
| Other | Proc, Symp on Polym and Polycondens Processes, Am Chem Soc 169th Natl Meet |
|---|---|
| City | Philadelphia, PA, USA |
| Period | 4/7/75 → 4/10/75 |
All Science Journal Classification (ASJC) codes
- General Engineering