Regulation of thermal conditions under fast chemical reactions in turbulent flows

Regulation of thermal conditions under fast chemical reactions in turbulent flows 

Temperature field in reaction zone is the major factor determining effectiveness of fast polymerization processes. This field depends on reactor-polymerizer geometry, monomer and catalyst concentrations, speeds of flow movement and turbulence, way of components mixing, etc. [1,26, 62,66,185]. 

Under polymerization fast processes when R R [28, 35], when intensive longitudinal and cross mixing average temperature in reaction zone so that MMD and average MM are turned to be close to characteristic for isothermal conditions at temperatures corresponding to adiabatic mixture initial heating. However, polymerization possibilities in adiabatic conditions are usually limited by 

Possibility of initial mixture cooling in the case of process under which reaction mixture boiling temperature is not reached is limited by boiling temperature of coolant, for example ethylene (Tbou. = 183 K). Until solvent boiling begins mixture temperature will rise in proportion to polymer yield increase in accordance to the expression [60]  

If we use temperature turn-down equal 90°C (coolant - liquid ethylene), then we shall be able to polymerize about 15 mass % of isobutylene at the expense of adiabatic heating of reaction mixture [60]. If we use liquid ammonia as coolant (Tbou = 243 K), then for the time of reaction mixture heating it is possible to receive not more than 10 mass % of polymer. 

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